1138 lines
36 KiB
HTML
1138 lines
36 KiB
HTML
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<html>
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<head>
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<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>The New Halloween Document</title>
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</head>
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<body bgcolor="#ffffff" marginheight="4" marginwidth="4" leftmargin="4" topmargin="4" alink="#023264" vlink="#023264" link="#525D76" text="#000000">
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr>
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<td align="left" valign="top"><a href="http://jakarta.apache.org/index.html"><img src="images/jakarta-logo.gif" border="0" vspace="0" hspace="0"></a></td><td bgcolor="#ffffff" align="left" valign="top" width="100%"><img src="images/header.gif" align="right" border="0" vspace="0" hspace="0"></td>
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</tr>
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<tr>
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<td colspan="2" height="2" width="100%">
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<hr size="1" noshade="">
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</td>
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</tr>
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</table>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr>
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<td valign="top" width="1%"></td><td nowrap="1" valign="top" width="14%">
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<br>
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<font face="arial,helvetica,sanserif">
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<br>
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<font size="+1" color="#000000">Navigation</font><font size="-1">
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<ul>
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<li>
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<a href="../index.html"><font size="-1">Main</font></a>
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</li>
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</ul>
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</font>
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<br>
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<font size="+1" color="#000000">HSSF</font><font size="-1">
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<ul>
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<li>
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<a href="how-to.html"><font size="-1">HOWTO</font></a>
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</li>
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<li>
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<a href="use-case.html"><font size="-1">Use Case</font></a>
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</li>
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</ul>
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</font>
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<br>
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<br>
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</font></td><td align="left" valign="top" width="*">
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<title>The New Halloween Document</title>
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<center>
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<table width="80%">
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<tr>
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<td bgcolor="#F3DD61"><font face="Arial,sans-serif" size="+1">
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<center>
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<b>The New Halloween Document</b>
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</center>
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</font></td>
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</tr>
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</table>
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</center>
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<font size="-2" color="#000000">
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<p>
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<a href="mailto:"></a>
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</p>
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</font>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="100%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>How to use the HSSF prototype API</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Recent revision history</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<ul>
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<li>12.30.2001 - revised for poi 1.0-final - minor revisions</li>
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<li>01.03.2001 - revised for poi 1.1-devel</li>
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</ul>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Capabilities</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">This release of the how-to outlines functionality included in a
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development build of HSSF. Those looking for information on the
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release edition should look in the poi-src for the release or at a
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previous edition in CVS tagged for that release.</p>
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<p align="justify">
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This release allows numeric and string cell values to be written to
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or read from an XLS file. Also in this release is row and column
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sizing, cell styling (bold, italics, borders,etc), and support for
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built-in data formats. New to this release is an event-based API
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for reading XLS files. It differs greatly from the read/write API
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and is intended for intermediate developers who need a smaller
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memory footprint. It will also serve as the basis for the HSSF
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Generator.</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Target Audience</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">This release is intended for developers, java-fanatics and the
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just generally all around impatient. HSSF has not yet been
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extensively tested in a high load multi-threaded situation. This
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release is not considered to be "golden" as it has new
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features that have not been extensively tested, and is an early 2.0
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build that could be restructured significantly in the future (not
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that there are necessarily plans to do so, just that you're better
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off basing your code on 1.0 and sticking with it if you don't need
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2.0 stuff bad enough to deal with us pulling the rug out from under
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you regularly).</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>General Use</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="98%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>User API</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="97%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>Writing a new one</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">The high level API (package: org.apache.poi.hssf.usermodel)
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is what most people should use. Usage is very simple.
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</p>
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<p align="justify">Workbooks are created by creating an instance of
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org.apache.poi.hssf.usermodel.HSSFWorkbook.
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</p>
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<p align="justify">Sheets are created by calling createSheet() from an existing
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instance of HSSFWorkbook, the created sheet is automatically added in
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sequence to the workbook. In this release there will always be at
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least three sheets generated regardless of whether you have three
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sheets. More than three sheets is probably not supported. Sheets do
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not in themselves have a sheet name (the tab at the bottom); you set
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the name associated with a sheet by calling
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HSSFWorkbook.setSheetName(sheetindex,"SheetName").</p>
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<p align="justify">Rows are created by calling createRow(rowNumber) from an existing
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instance of HSSFSheet. Only rows that have cell values should be
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added to the sheet. To set the row's height, you just call
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setRowHeight(height) on the row object. The height must be given in
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twips, or 1/20th of a point. If you prefer, there is also a
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setRowHeightInPoints method.
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</p>
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<p align="justify">Cells are created by calling createCell(column, type) from an
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existing HSSFRow. Only cells that have values should be added to the
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row. Cells should have their cell type set to either
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HSSFCell.CELL_TYPE_NUMERIC or HSSFCell.CELL_TYPE_STRING depending on
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whether they contain a numeric or textual value. Cells must also have
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a value set. Set the value by calling setCellValue with either a
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String or double as a parameter. Individual cells do not have a
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width; you must call setColumnWidth(colindex, width) (use units of
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1/256th of a character) on the HSSFSheet object. (You can't do it on
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an individual basis in the GUI either).</p>
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<p align="justify">Cells are styled with HSSFCellStyle objects which in turn contain
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a reference to an HSSFFont object. These are created via the
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HSSFWorkbook object by calling createCellStyle() and createFont().
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Once you create the object you must set its parameters (colors,
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borders, etc). To set a font for an HSSFCellStyle call
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setFont(fontobj).
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</p>
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<p align="justify">Once you have generated your workbook, you can write it out by
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calling write(outputStream) from your instance of Workbook, passing
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it an OutputStream (for instance, a FileOutputStream or
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ServletOutputStream). You must close the OutputStream yourself. HSSF
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does not close it for you.
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</p>
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<p align="justify">Here is some example code (excerpted and adapted from
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org.apache.poi.hssf.dev.HSSF test class):</p>
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<div align="center">
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<table cellspacing="2" cellpadding="2" border="1">
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<tr>
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<td>
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<pre> // create a new file
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FileOutputStream out = new FileOutputStream("/home/me/myfile.xls");
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// create a new workbook
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HSSFWorkbook wb = new HSSFWorkbook();
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// create a new sheet
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HSSFSheet s = wb.createSheet();
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// declare a row object reference
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HSSFRow r = null;
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// declare a cell object reference
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HSSFCell c = null;
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// create 3 cell styles
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HSSFCellStyle cs = wb.createCellStyle();
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HSSFCellStyle cs2 = wb.createCellStyle();
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HSSFCellStyle cs3 = wb.createCellStyle();
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// create 2 fonts objects
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HSSFFont f = wb.createFont();
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HSSFFont f2 = wb.createFont();
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//set font 1 to 12 point type
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f.setFontHeightInPoints((short)12);
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//make it red
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f.setColor((short)0xA);
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// make it bold
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//arial is the default font
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f.setBoldweight(f.BOLDWEIGHT_BOLD);
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//set font 2 to 10 point type
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f2.setFontHeightInPoints((short)10);
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//make it the color at palette index 0xf (white)
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f2.setColor((short)0xf);
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//make it bold
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f2.setBoldweight(f2.BOLDWEIGHT_BOLD);
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//set cell stlye
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cs.setFont(f);
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//set the cell format see HSSFDataFromat for a full list
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cs.setDataFormat(HSSFDataFormat.getFormat("($#,##0_);[Red]($#,##0)"));
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//set a thin border
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cs2.setBorderBottom(cs2.BORDER_THIN);
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//fill w fg fill color
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cs2.setFillPattern((short)1);
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// set foreground fill to red
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cs2.setFillForegroundColor((short)0xA);
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// set the font
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cs2.setFont(f2);
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// set the sheet name to HSSF Test
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wb.setSheetName(0,"HSSF Test");
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// create a sheet with 300 rows (0-299)
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for (rownum = (short)0; rownum < 300; rownum++)
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{
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// create a row
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r = s.createRow(rownum);
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// on every other row
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if ( (rownum % 2) == 0) {
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// make the row height bigger (in twips - 1/20 of a point)
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r.setHeight((short)0x249);
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}
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//r.setRowNum(( short ) rownum);
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// create 50 cells (0-49) (the += 2 becomes apparent later
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for (short cellnum = (short)0; cellnum < 50; cellnum += 2)
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{
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// create a numeric cell
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c = r.createCell(cellnum,HSSFCell.CELL_TYPE_NUMERIC);
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// do some goofy math to demonstrate decimals
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c.setCellValue(rownum * 10000 + cellnum
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+ ((( double ) rownum / 1000)
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+ (( double ) cellnum / 10000)));
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// on every other row
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if ( (rownum % 2) == 0) {
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// set this cell to the first cell style we defined
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c.setCellStyle(cs);
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}
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// create a string cell (see why += 2 in the
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c = r.createCell((short)(cellnum+1),HSSFCell.CELL_TYPE_STRING);
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// set the cell's string value to "TEST"
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c.setCellValue("TEST");
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// make this column a bit wider
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s.setColumnWidth((short)(cellnum+1), (short)((50*8) / ((double)1/20)) );
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// on every other row
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if ( (rownum % 2) == 0) {
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// set this to the white on red cell style
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// we defined above
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c.setCellStyle(cs2);
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}
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}
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}
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//draw a thick black border on the row at the bottom using BLANKS
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// advance 2 rows
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rownum++;
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rownum++;
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r = s.createRow(rownum);
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// define the third style to be the default
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// except with a thick black border at the bottom
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cs3.setBorderBottom(cs3.BORDER_THICK);
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//create 50 cells
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for (short cellnum = (short)0; cellnum < 50; cellnum++) {
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//create a blank type cell (no value)
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c = r.createCell(cellnum,HSSFCell.CELL_TYPE_BLANK);
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// set it to the thick black border style
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c.setCellStyle(cs3);
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}
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//end draw thick black border
|
||
|
|
|
||
|
|
|
||
|
|
// demonstrate adding/naming and deleting a sheet
|
||
|
|
// create a sheet, set its title then delete it
|
||
|
|
s = wb.createSheet();
|
||
|
|
wb.setSheetName(1,"DeletedSheet");
|
||
|
|
wb.removeSheetAt(1);
|
||
|
|
//end deleted sheet
|
||
|
|
|
||
|
|
// write the workbook to the output stream
|
||
|
|
// close our file (don't blow out our file handles
|
||
|
|
wb.write(out);
|
||
|
|
out.close();
|
||
|
|
</pre>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>Reading or modifying an existing file</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">Reading in a file is equally simple. To read in a file, create a
|
||
|
|
new instance of org.apache.poi.poifs.Filesystem, passing in an open InputStream, such as a FileInputStream
|
||
|
|
for your XLS, to the constructor. Construct a new instance of
|
||
|
|
org.apache.poi.hssf.usermodel.HSSFWorkbook passing the
|
||
|
|
Filesystem instance to the constructor. From there you have access to
|
||
|
|
all of the high level model objects through their assessor methods
|
||
|
|
(workbook.getSheet(sheetNum), sheet.getRow(rownum), etc).
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">Modifying the file you have read in is simple. You retrieve the
|
||
|
|
object via an assessor method, remove it via a parent object's remove
|
||
|
|
method (sheet.removeRow(hssfrow)) and create objects just as you
|
||
|
|
would if creating a new xls. When you are done modifying cells just
|
||
|
|
call workbook.write(outputstream) just as you did above.</p>
|
||
|
|
|
||
|
|
<p align="justify">An example of this can be seen in
|
||
|
|
<a href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/poi/poi/production/src/net/sourceforge/poi/hssf/dev/HSSF.java?rev=HEAD&content-type=text/plain">org.apache.poi.hssf.dev.HSSF</a>.</p>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>Event API</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">The event API is brand new. It is intended for intermediate
|
||
|
|
developers who are willing to learn a little bit of the low level API
|
||
|
|
structures. Its relatively simple to use, but requires a basic
|
||
|
|
understanding of the parts of an Excel file (or willingness to
|
||
|
|
learn). The advantage provided is that you can read an XLS with a
|
||
|
|
relatively small memory footprint.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">To use this API you construct an instance of
|
||
|
|
org.apache.poi.hssf.eventmodel.HSSFRequest. Register a class you
|
||
|
|
create that supports the
|
||
|
|
org.apache.poi.hssf.eventmodel.HSSFListener interface using the
|
||
|
|
HSSFRequest.addListener(yourlistener, recordsid). The recordsid
|
||
|
|
should be a static reference number (such as BOFRecord.sid) contained
|
||
|
|
in the classes in org.apache.poi.hssf.record. The trick is you
|
||
|
|
have to know what these records are. Alternatively you can call
|
||
|
|
HSSFRequest.addListenerForAllRecords(mylistener). In order to learn
|
||
|
|
about these records you can either read all of the javadoc in the
|
||
|
|
org.apache.poi.hssf.record package or you can just hack up a
|
||
|
|
copy of org.apache.poi.hssf.dev.EFHSSF and adapt it to your
|
||
|
|
needs. TODO: better documentation on records.</p>
|
||
|
|
|
||
|
|
<p align="justify">Once you've registered your listeners in the HSSFRequest object
|
||
|
|
you can construct an instance of
|
||
|
|
org.apache.poi.poifs.filesystem.FileSystem (see POIFS howto) and
|
||
|
|
pass it your XLS file inputstream. You can either pass this, along
|
||
|
|
with the request you constructed, to an instance of HSSFEventFactory
|
||
|
|
via the HSSFEventFactory.processWorkbookEvents(request, Filesystem)
|
||
|
|
method, or you can get an instance of DocumentInputStream from
|
||
|
|
Filesystem.createDocumentInputStream("Workbook") and pass
|
||
|
|
it to HSSFEventFactory.processEvents(request, inputStream). Once you
|
||
|
|
make this call, the listeners that you constructed receive calls to
|
||
|
|
their processRecord(Record) methods with each Record they are
|
||
|
|
registered to listen for until the file has been completely read.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">A code excerpt from org.apache.poi.hssf.dev.EFHSSF (which is
|
||
|
|
in CVS or the source distribution) is reprinted below with excessive
|
||
|
|
comments:</p>
|
||
|
|
|
||
|
|
<div align="center">
|
||
|
|
<table cellspacing="2" cellpadding="2" border="1">
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<pre>
|
||
|
|
//this non-public class implements the required interface
|
||
|
|
// we construct it with a copy of its container class...this is cheap but effective
|
||
|
|
class EFHSSFListener implements HSSFListener {
|
||
|
|
EFHSSF efhssf;
|
||
|
|
public EFHSSFListener(EFHSSF efhssf) {
|
||
|
|
this.efhssf = efhssf;
|
||
|
|
}
|
||
|
|
|
||
|
|
// we just use this as an adapter so we pass the record to the method in the container class
|
||
|
|
public void processRecord(Record record) {
|
||
|
|
efhssf.recordHandler(record);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//here is an excerpt of the main line execution code from EFHSSF
|
||
|
|
public void run() throws IOException {
|
||
|
|
// create a new file input stream with the input file specified
|
||
|
|
// at the command line
|
||
|
|
FileInputStream fin = new FileInputStream(infile);
|
||
|
|
// create a new org.apache.poi.poifs.filesystem.Filesystem
|
||
|
|
Filesystem poifs = new Filesystem(fin);
|
||
|
|
// get the Workbook (excel part) stream in a InputStream
|
||
|
|
InputStream din = poifs.createDocumentInputStream("Workbook");
|
||
|
|
// construct out HSSFRequest object
|
||
|
|
HSSFRequest req = new HSSFRequest();
|
||
|
|
// lazy listen for ALL records with the listener shown above
|
||
|
|
req.addListenerForAllRecords(new EFHSSFListener(this));
|
||
|
|
// create our event factory
|
||
|
|
HSSFEventFactory factory = new HSSFEventFactory();
|
||
|
|
// process our events based on the document input stream
|
||
|
|
factory.processEvents(req,din);
|
||
|
|
// once all the events are processed close our file input stream
|
||
|
|
fin.close();
|
||
|
|
// and our document input stream (don't want to leak these!)
|
||
|
|
din.close();
|
||
|
|
// create a new output stream from filename specified at the command line
|
||
|
|
FileOutputStream fout = new FileOutputStream(outfile);
|
||
|
|
// write the HSSFWorkbook (class member) we created out to the file.
|
||
|
|
workbook.write(fout);
|
||
|
|
// close our file output stream
|
||
|
|
fout.close();
|
||
|
|
// print done. Go enjoy your copy of the file.
|
||
|
|
System.out.println("done.");
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//here is an excerpt of the recordHander called from our listener.
|
||
|
|
// the record handler in the container class is intent on just rewriting the file
|
||
|
|
public void recordHandler(Record record) {
|
||
|
|
HSSFRow row = null;
|
||
|
|
HSSFCell cell = null;
|
||
|
|
int sheetnum = -1;
|
||
|
|
switch (record.getSid()) {
|
||
|
|
// the BOFRecord can represent either the beginning of a sheet or the workbook
|
||
|
|
case BOFRecord.sid:
|
||
|
|
BOFRecord bof = (BOFRecord) record;
|
||
|
|
if (bof.getType() == bof.TYPE_WORKBOOK) {
|
||
|
|
//if its the workbook then create a new HSSFWorkbook
|
||
|
|
workbook = new HSSFWorkbook();
|
||
|
|
// assigned to the class level member
|
||
|
|
} else if (bof.getType() == bof.TYPE_WORKSHEET) {
|
||
|
|
sheetnum++;
|
||
|
|
// otherwise if its a sheet increment the sheetnum index
|
||
|
|
cursheet = workbook.getSheetAt(sheetnum);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
// get the sheet at that index and assign it to method variable
|
||
|
|
// cursheet (the sheet was created when the BoundSheetRecord record occurred
|
||
|
|
case BoundSheetRecord.sid:
|
||
|
|
// when we find a boundsheet record create a new sheet in the workbook and
|
||
|
|
BoundSheetRecord bsr = (BoundSheetRecord) record;
|
||
|
|
// assign it the name specified in this record.
|
||
|
|
workbook.createSheet(bsr.getSheetname());
|
||
|
|
break;
|
||
|
|
// if this is a row record add the row to the current sheet
|
||
|
|
case RowRecord.sid:
|
||
|
|
RowRecord rowrec = (RowRecord) record;
|
||
|
|
// assign our row the rownumber specified in the Row Record
|
||
|
|
cursheet.createRow(rowrec.getRowNumber());
|
||
|
|
break;
|
||
|
|
// if this is a NumberRecord (RKRecord, MulRKRecord get converted to Number
|
||
|
|
// records) then get the row specified in the number record from the current
|
||
|
|
// sheet. With this instance of HSSFRow create a new HSSFCell with the column
|
||
|
|
// number specified in the record and assign it type NUMERIC
|
||
|
|
case NumberRecord.sid:
|
||
|
|
NumberRecord numrec = (NumberRecord) record;
|
||
|
|
row = cursheet.getRow(numrec.getRow());
|
||
|
|
cell = row.createCell(numrec.getColumn(),HSSFCell.CELL_TYPE_NUMERIC);
|
||
|
|
// set the HSSFCell's value to the value stored in the NumberRecord
|
||
|
|
cell.setCellValue(numrec.getValue());
|
||
|
|
break;
|
||
|
|
// if this is the SSTRecord (occurs once in the workbook) then add all of its
|
||
|
|
// strings to our workbook. We'll look them up later when we add LABELSST records.
|
||
|
|
case SSTRecord.sid:
|
||
|
|
SSTRecord sstrec = (SSTRecord) record;
|
||
|
|
for (int k = 0; k < sstrec.getNumUniqueStrings(); k++) {
|
||
|
|
workbook.addSSTString(sstrec.getString(k));
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
// if this is a LabelSSTRecord then get the row specified in the LabelSSTRecord from
|
||
|
|
// the current sheet. With this instance of HSSFRow create a new HSSFCell with the
|
||
|
|
// column nubmer specified in the record and set the type to type STRING.
|
||
|
|
case LabelSSTRecord.sid:
|
||
|
|
LabelSSTRecord lrec = (LabelSSTRecord) record;
|
||
|
|
row = cursheet.getRow(lrec.getRow());
|
||
|
|
cell = row.createCell(lrec.getColumn(),HSSFCell.CELL_TYPE_STRING);
|
||
|
|
//set the cells value to the string in our workbook object (added in the case
|
||
|
|
//above) at the index specified by the LabelSSTRecord.
|
||
|
|
cell.setCellValue(workbook.getSSTString(lrec.getSSTIndex()));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}</pre>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>Low Level APIs</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">The low level API is not much to look at. It consists of lots of
|
||
|
|
"Records" in the org.apache.poi.hssf.record.* package,
|
||
|
|
and set of helper classes in org.apache.poi.hssf.model.*. The
|
||
|
|
record classes are consistent with the low level binary structures
|
||
|
|
inside a BIFF8 file (which is embedded in a POIFS file system). You
|
||
|
|
probably need the book: "Microsoft Excel 97 Developer's Kit"
|
||
|
|
from Microsoft Press in order to understand how these fit together
|
||
|
|
(out of print but easily obtainable from Amazon's used books). In
|
||
|
|
order to gain a good understanding of how to use the low level APIs
|
||
|
|
should view the source in org.apache.poi.hssf.usermodel.* and
|
||
|
|
the classes in org.apache.poi.hssf.model.*. You should read the
|
||
|
|
documentation for the POIFS libraries as well.</p>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>HSSF Class/Test Application</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">The HSSF application is nothing more than a test for the high
|
||
|
|
level API (and indirectly the low level support). The main body of
|
||
|
|
its code is repeated above. To run it:
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<ul>
|
||
|
|
|
||
|
|
<li>download the poi-alpha build and untar it (tar xvzf
|
||
|
|
tarball.tar.gz)
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li>set up your classpath as follows:
|
||
|
|
<code>export HSSFDIR={wherever you put HSSF's jar files}
|
||
|
|
export LOG4JDIR={wherever you put LOG4J's jar files}
|
||
|
|
export CLASSPATH=$CLASSPATH:$HSSFDIR/hssf.jar:$HSSFDIR/poi-poifs.jar:$HSSFDIR/poi-util.jar:$LOG4JDIR/jog4j.jar</code>
|
||
|
|
|
||
|
|
</li>
|
||
|
|
<li>type:
|
||
|
|
<code>java org.apache.poi.hssf.dev.HSSF ~/myxls.xls write</code>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
<p align="justify">This should generate a test sheet in your home directory called <code>"myxls.xls"</code>. </p>
|
||
|
|
|
||
|
|
<ul>
|
||
|
|
|
||
|
|
<li>Type:
|
||
|
|
<code>java org.apache.poi.hssf.dev.HSSF ~/input.xls output.xls
|
||
|
|
This is the read/write/modify test. It reads in the spreadsheet, modifies a cell, and writes it back out.
|
||
|
|
Failing this test is not necessarily a bad thing. If HSSF tries to modify a non-existant sheet then this will
|
||
|
|
most likely fail. No big deal. </code>
|
||
|
|
</li>
|
||
|
|
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>HSSF Logging facility</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<p align="justify">HSSF now has a logging facility (using log4j - thanks jakarta!)
|
||
|
|
that will record massive amounts of debugging information. Its mostly
|
||
|
|
useful to us hssf-developing geeks, but might be useful in tracking
|
||
|
|
down problems. By default we turn this off because it results in
|
||
|
|
unnecessary performance degradation when fully turned on! Using it is
|
||
|
|
simple. You need an hssflog.properties file (example listed below,
|
||
|
|
those familiar with log4j can customize this as they wish). You can
|
||
|
|
either put this in your home directory (or wherever the default
|
||
|
|
directory is on windows which I suspect is c:\windows) or you can put
|
||
|
|
it wherever you want and set the HSSF.log to the path ending in "/"
|
||
|
|
(or "\\" on windows). If for any reason HSSF can't find it,
|
||
|
|
you get no logging. If the log configuration dictates the logging be
|
||
|
|
turned off, you get no logging.</p>
|
||
|
|
|
||
|
|
<p align="justify">Here is an example hssflog.properties (actually its not an example
|
||
|
|
its mine):
|
||
|
|
<div align="center">
|
||
|
|
<table cellspacing="2" cellpadding="2" border="1">
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<pre># Set root category priority to DEBUG and its only appender to A1.
|
||
|
|
log4j.rootCategory=DEBUG, A1
|
||
|
|
|
||
|
|
# A1 is set to be a ConsoleAppender.
|
||
|
|
log4j.appender.A1=org.apache.log4j.ConsoleAppender
|
||
|
|
|
||
|
|
# A1 uses PatternLayout.
|
||
|
|
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
|
||
|
|
log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
|
||
|
|
#uncomment below to change the level to WARN to disable debugging information. This effectively turns off logging.
|
||
|
|
#the default level is DEBUG (and changing it to DEBUG is the basically the same thing as leaving it commented out).
|
||
|
|
#log4j.category.org.apache.poi=WARN</pre>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
</p>
|
||
|
|
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>HSSF Developer's tools</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">HSSF has a number of tools useful for developers to debug/develop
|
||
|
|
stuff using HSSF (and more generally XLS files). We've already
|
||
|
|
discussed the app for testing HSSF read/write/modify capabilities;
|
||
|
|
now we'll talk a bit about BiffViewer. Early on in the development of
|
||
|
|
HSSF, it was decided that knowing what was in a record, what was
|
||
|
|
wrong with it, etc. was virtually impossible with the available
|
||
|
|
tools. So we developed BiffViewer. You can find it at
|
||
|
|
org.apache.poi.hssf.dev.BiffViewer. It performs two basic
|
||
|
|
functions and a derivative.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">The first is "biffview". To do this you run it (assumes
|
||
|
|
you have everything setup in your classpath and that you know what
|
||
|
|
you're doing enough to be thinking about this) with an xls file as a
|
||
|
|
parameter. It will give you a listing of all understood records with
|
||
|
|
their data and a list of not-yet-understood records with no data
|
||
|
|
(because it doesn't know how to interpret them). This listing is
|
||
|
|
useful for several things. First, you can look at the values and SEE
|
||
|
|
what is wrong in quasi-English. Second, you can send the output to a
|
||
|
|
file and compare it.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">The second function is "big freakin dump", just pass a
|
||
|
|
file and a second argument matching "bfd" exactly. This
|
||
|
|
will just make a big hexdump of the file.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">Lastly, there is "mixed" mode which does the same as
|
||
|
|
regular biffview, only it includes hex dumps of certain records
|
||
|
|
intertwined. To use that just pass a file with a second argument
|
||
|
|
matching "on" exactly.</p>
|
||
|
|
|
||
|
|
<p align="justify">In the next release cycle we'll also have something called a
|
||
|
|
FormulaViewer. The class is already there, but its not very useful
|
||
|
|
yet. When it does something, I'll document it.</p>
|
||
|
|
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>What's Next?</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<p align="justify">This release contains code that supports "internationalization"
|
||
|
|
or more accurately non-US/UK languages; however, it has not been
|
||
|
|
tested with the new API changes (please help us with this). We've
|
||
|
|
shifted focus a bit for this release in recognition of the
|
||
|
|
international support we've gotten. We're going to focus on western
|
||
|
|
European languages for our first beta. We're more than happy to
|
||
|
|
accept help in supporting non-Western European languages if someone
|
||
|
|
who knows what they're doing in this area is willing to pitch in!
|
||
|
|
(There is next to no documentation on what is necessary to support
|
||
|
|
such a move and its really hard to support a language when you don't even
|
||
|
|
know the alphabet).</p>
|
||
|
|
|
||
|
|
<p align="justify">This release of HSSF does not yet support Formulas. I've been
|
||
|
|
focusing on the requests I've gotten in. That being said, if we get
|
||
|
|
more user feedback on what is most useful first we'll aim for that.
|
||
|
|
As a general principal, HSSF's goal is to support HSSF-Serializer
|
||
|
|
(meaning an emphasis on write). We would like to hear from you! How
|
||
|
|
are you using HSSF/POIFS? How would you like to use it? What features
|
||
|
|
are most important first?
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p align="justify">This release is near feature freeze for the 1.0-beta. All
|
||
|
|
priorities refer to things we'll be adding in the next release
|
||
|
|
(probably 2.0). The 1.0-beta is scheduled for release in the mid to
|
||
|
|
late December timeframe. While it's way to early to say when the
|
||
|
|
2.0-beta will be released, my "gut" feeling is to aim for
|
||
|
|
around March and have at least the first three items.</p>
|
||
|
|
|
||
|
|
<p align="justify">Current list of priorities:</p>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Helper class for fonts, etc.</li>
|
||
|
|
|
||
|
|
<li>Add Formulas.</li>
|
||
|
|
|
||
|
|
<li>Implement more record types (for other things ... not sure
|
||
|
|
what this will mean yet).</li>
|
||
|
|
|
||
|
|
<li>Add more dummy checks (for when API user's do things they
|
||
|
|
"can't" do)</li>
|
||
|
|
|
||
|
|
<li>Add support for embedded graphics and stuff like that.</li>
|
||
|
|
|
||
|
|
<li>Create new adapter object for handling MulBlank, MulRk, Rk
|
||
|
|
records.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="98%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-1"><font face="Arial,sans-serif"><b>Changes</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>1.1.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Created new event model</li>
|
||
|
|
|
||
|
|
<li>Optimizations made to HSSF including aggregate records for
|
||
|
|
values, rows, etc.</li>
|
||
|
|
|
||
|
|
<li>predictive sizing, offset based writing (instead of lots of
|
||
|
|
array copies)</li>
|
||
|
|
|
||
|
|
<li>minor re-factoring and bug fixes.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>1.0.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Minor documentation updates.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.14.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Added DataFormat helper class and exposed set and get format
|
||
|
|
on HSSFCellStyle</li>
|
||
|
|
|
||
|
|
<li>Fixed column width apis (unit wise) and various javadoc on
|
||
|
|
the subject</li>
|
||
|
|
|
||
|
|
<li>Fix for Dimensions record (again)... (one of these days I'll
|
||
|
|
write a unit test for this ;-p).</li>
|
||
|
|
|
||
|
|
<li>Some optimization on sheet creation.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.13.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<p align="justify">- NO WAY!</p>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.12.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Added MulBlank, Blank, ColInfo</li>
|
||
|
|
|
||
|
|
<li>Added log4j facility and removed all sys.out type logging</li>
|
||
|
|
|
||
|
|
<li>Added support for adding font's, styles and corresponding
|
||
|
|
high level api for styling cells</li>
|
||
|
|
|
||
|
|
<li>added support for changing row height, cell width and default
|
||
|
|
row height/cell width.</li>
|
||
|
|
|
||
|
|
<li>Added fixes for internationalization (UTF-16 should work now
|
||
|
|
from HSSFCell.setStringValue, etc when the encoding is set)</li>
|
||
|
|
|
||
|
|
<li>added support for adding/removing and naming sheets.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.11.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Bugfix release. We were throwing an exception when reading
|
||
|
|
RKRecord objects.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.10.0</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Got continuation records to work (read/write)</li>
|
||
|
|
|
||
|
|
<li>Added various pre-support for formulas</li>
|
||
|
|
|
||
|
|
<li>Massive API reorganization, repackaging.</li>
|
||
|
|
|
||
|
|
<li>BiffViewer class added for validating HSSF & POI and/or
|
||
|
|
HSSF Output.</li>
|
||
|
|
|
||
|
|
<li>Better API support for modification.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.7 (and interim releases)</b></font></font></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<ol>
|
||
|
|
|
||
|
|
<li>Added encoding flag to high and low level api to use utf-16
|
||
|
|
when needed (HSSFCell.setEncoding())</li>
|
||
|
|
|
||
|
|
<li>added read only support for Label records (which are
|
||
|
|
reinterpreted as LabelSST when written)</li>
|
||
|
|
|
||
|
|
<li>Broken continuation record implementation (oops)</li>
|
||
|
|
|
||
|
|
<li>BiffViewer class added for validating HSSF & POI and/or
|
||
|
|
HSSF Output.</li>
|
||
|
|
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<br>
|
||
|
|
|
||
|
|
<div align="right">
|
||
|
|
<table cellspacing="0" cellpadding="2" border="0" width="97%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#525D76"><font color="#ffffff" size="-2"><font face="Arial,sans-serif"><b>0.6 (release)</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<ol>
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<li>Support for read/write and modify.</li>
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<li>Read only support for MulRK records (converted to Number when
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writing)
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</li>
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</ol>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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</div>
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<br>
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</td>
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</tr>
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</table>
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<br>
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<table cellpadding="0" cellspacing="0" border="0" width="100%">
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<tr>
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<td>
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<hr size="1" noshade="">
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</td>
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</tr>
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<tr>
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<td align="center"><font color="#525D76" size="-1" face="arial,helvetica,sanserif"><i>
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Copyright ©2002 Apache Software Foundation
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|
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</i></font></td><td width="5%" align="right"><img src="images/cocoon2-small.jpg" align="right" border="0" vspace="0" hspace="0"></td>
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</tr>
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</table>
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</body>
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</html>
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