Some minor changes.
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352327 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Glen Stampoultzis
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
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<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
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<document>
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<header>
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<title>The New Halloween Document</title>
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<authors>
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<person email="acoliver2@users.sourceforge.net" name="Andrew C. Oliver" id="AO"/>
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<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
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</authors>
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</header>
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<header>
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<title>The New Halloween Document</title>
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<authors>
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<person email="acoliver2@users.sourceforge.net" name="Andrew C. Oliver" id="AO"/>
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<person email="glens@apache.org" name="Glen Stampoultzis" id="GJS"/>
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</authors>
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</header>
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<body>
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<s1 title="How to use the HSSF prototype API">
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<s2 title="Capabilities">
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<p>This release of the how-to outlines functionality for 1.5.
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Those looking for information on the release edition should
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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>
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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 as well as reading and writing dates. Also
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in this release is row and column sizing, cell styling (bold,
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italics, borders,etc), and support for built-in data formats. New
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to this release is an event-based API for reading XLS files.
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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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</s2>
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<s2 title="Target Audience">
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<p>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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</s2>
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<s2 title="Capabilities">
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<p>This release of the how-to outlines functionality for the 1.5 release.
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Those looking for information on previous releases should
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look in the documentation distributed with that release.</p>
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<p>
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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 as well as reading and writing dates. Also
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in this release is row and column sizing, cell styling (bold,
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italics, borders,etc), and support for built-in data formats. New
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to this release is an event-based API for reading XLS files.
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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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</s2>
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<s2 title="General Use">
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<s3 title="User API">
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<s4 title="Writing a new one">
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<p>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>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>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. Sheets do not in themselves have a sheet
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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>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>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>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>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>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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<p>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>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>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. Sheets do not in themselves have a sheet
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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>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>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>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>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>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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<source><![CDATA[ short rownum;
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// create a new file
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@ -233,7 +220,7 @@ for your XLS, to the constructor. Construct a new instance of
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org.apache.poi.hssf.usermodel.HSSFWorkbook passing the
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Filesystem instance to the constructor. From there you have access to
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all of the high level model objects through their assessor methods
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(workbook.getSheet(sheetNum), sheet.getRow(rownum), etc).
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(workbook.getSheet(sheetNum), sheet.getRow(rownum), etc).
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</p>
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<p>Modifying the file you have read in is simple. You retrieve the
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object via an assessor method, remove it via a parent object's remove
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@ -242,45 +229,46 @@ would if creating a new xls. When you are done modifying cells just
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call workbook.write(outputstream) just as you did above.</p>
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<p>An example of this can be seen in
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<link href="http://cvs.apache.org/viewcvs/~checkout~/jakarta-poi/src/java/org/apache/poi/hssf/dev/HSSF.java?rev=1.1">org.apache.poi.hssf.dev.HSSF</link>.</p>
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</s4> </s3>
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</s4>
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</s3>
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<s3 title="Event API">
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<p>The event API is brand new. It is intended for intermediate
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developers who are willing to learn a little bit of the low level API
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structures. Its relatively simple to use, but requires a basic
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understanding of the parts of an Excel file (or willingness to
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learn). The advantage provided is that you can read an XLS with a
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relatively small memory footprint.
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</p>
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<p>To use this API you construct an instance of
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org.apache.poi.hssf.eventmodel.HSSFRequest. Register a class you
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create that supports the
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org.apache.poi.hssf.eventmodel.HSSFListener interface using the
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HSSFRequest.addListener(yourlistener, recordsid). The recordsid
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should be a static reference number (such as BOFRecord.sid) contained
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in the classes in org.apache.poi.hssf.record. The trick is you
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have to know what these records are. Alternatively you can call
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HSSFRequest.addListenerForAllRecords(mylistener). In order to learn
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about these records you can either read all of the javadoc in the
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org.apache.poi.hssf.record package or you can just hack up a
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copy of org.apache.poi.hssf.dev.EFHSSF and adapt it to your
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needs. TODO: better documentation on records.</p>
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<p>Once you've registered your listeners in the HSSFRequest object
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you can construct an instance of
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org.apache.poi.poifs.filesystem.FileSystem (see POIFS howto) and
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pass it your XLS file inputstream. You can either pass this, along
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with the request you constructed, to an instance of HSSFEventFactory
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via the HSSFEventFactory.processWorkbookEvents(request, Filesystem)
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method, or you can get an instance of DocumentInputStream from
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Filesystem.createDocumentInputStream("Workbook") and pass
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it to HSSFEventFactory.processEvents(request, inputStream). Once you
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make this call, the listeners that you constructed receive calls to
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their processRecord(Record) methods with each Record they are
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registered to listen for until the file has been completely read.
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</p>
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<p>A code excerpt from org.apache.poi.hssf.dev.EFHSSF (which is
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in CVS or the source distribution) is reprinted below with excessive
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comments:</p>
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<p>The event API is brand new. It is intended for intermediate
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developers who are willing to learn a little bit of the low level API
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structures. Its relatively simple to use, but requires a basic
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understanding of the parts of an Excel file (or willingness to
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learn). The advantage provided is that you can read an XLS with a
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relatively small memory footprint.
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</p>
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<p>To use this API you construct an instance of
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org.apache.poi.hssf.eventmodel.HSSFRequest. Register a class you
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create that supports the
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org.apache.poi.hssf.eventmodel.HSSFListener interface using the
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HSSFRequest.addListener(yourlistener, recordsid). The recordsid
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should be a static reference number (such as BOFRecord.sid) contained
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in the classes in org.apache.poi.hssf.record. The trick is you
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have to know what these records are. Alternatively you can call
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HSSFRequest.addListenerForAllRecords(mylistener). In order to learn
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about these records you can either read all of the javadoc in the
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org.apache.poi.hssf.record package or you can just hack up a
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copy of org.apache.poi.hssf.dev.EFHSSF and adapt it to your
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needs. TODO: better documentation on records.</p>
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<p>Once you've registered your listeners in the HSSFRequest object
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you can construct an instance of
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org.apache.poi.poifs.filesystem.FileSystem (see POIFS howto) and
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pass it your XLS file inputstream. You can either pass this, along
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with the request you constructed, to an instance of HSSFEventFactory
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via the HSSFEventFactory.processWorkbookEvents(request, Filesystem)
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method, or you can get an instance of DocumentInputStream from
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Filesystem.createDocumentInputStream("Workbook") and pass
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it to HSSFEventFactory.processEvents(request, inputStream). Once you
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make this call, the listeners that you constructed receive calls to
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their processRecord(Record) methods with each Record they are
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registered to listen for until the file has been completely read.
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</p>
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<p>A code excerpt from org.apache.poi.hssf.dev.EFHSSF (which is
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in CVS or the source distribution) is reprinted below with excessive
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comments:</p>
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<source><![CDATA[
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/**
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* This example shows how to use the event API for reading a file.
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@ -391,11 +379,11 @@ documentation for the POIFS libraries as well.</p>
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<p>The HSSF application is nothing more than a test for the high
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level API (and indirectly the low level support). The main body of
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its code is repeated above. To run it:
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its code is repeated above. To run it:
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</p>
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<ul>
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<li>download the poi-alpha build and untar it (tar xvzf
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tarball.tar.gz)
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tarball.tar.gz)
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</li>
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<li>set up your classpath as follows:
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<code>export HSSFDIR={wherever you put HSSF's jar files}
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@ -467,7 +455,7 @@ HSSF, it was decided that knowing what was in a record, what was
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wrong with it, etc. was virtually impossible with the available
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tools. So we developed BiffViewer. You can find it at
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org.apache.poi.hssf.dev.BiffViewer. It performs two basic
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functions and a derivative.
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functions and a derivative.
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</p>
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<p>The first is "biffview". To do this you run it (assumes
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you have everything setup in your classpath and that you know what
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@ -477,11 +465,11 @@ their data and a list of not-yet-understood records with no data
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(because it doesn't know how to interpret them). This listing is
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useful for several things. First, you can look at the values and SEE
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what is wrong in quasi-English. Second, you can send the output to a
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file and compare it.
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file and compare it.
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</p>
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<p>The second function is "big freakin dump", just pass a
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file and a second argument matching "bfd" exactly. This
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will just make a big hexdump of the file.
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will just make a big hexdump of the file.
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</p>
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<p>Lastly, there is "mixed" mode which does the same as
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regular biffview, only it includes hex dumps of certain records
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@ -511,7 +499,7 @@ more user feedback on what is most useful first we'll aim for that.
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As a general principal, HSSF's goal is to support HSSF-Serializer
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(meaning an emphasis on write). We would like to hear from you! How
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are you using HSSF/POIFS? How would you like to use it? What features
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are most important first?
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are most important first?
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</p>
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</s3>
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