new faq on cell styles
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352966 13f79535-47bb-0310-9956-ffa450edef68
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@ -66,7 +66,6 @@
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Thanks to Jason Hoffman for providing the solution.
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<source>
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case HSSFCell.CELL_TYPE_NUMERIC:
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double d = cell.getNumericCellValue();
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// test if a date!
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@ -78,9 +77,7 @@
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cellText = cal.get(Calendar.MONTH)+1 + "/" +
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cal.get(Calendar.DAY_OF_MONTH) + "/" +
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cellText;
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}
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</source>
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} </source>
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</answer>
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</faq>
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<faq>
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@ -93,7 +90,7 @@
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screen. The problem persists even though you have set the correct mime type.
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</p>
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<p>
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The short answer is, dont depend on IE to display a binary file type you an attachment properly if you stream it via a
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The short answer is, dont depend on IE to display a binary file type properly if you stream it via a
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servlet. Every minor version of IE has different bugs on this issue.
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</p>
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<p>
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@ -112,9 +109,8 @@
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<p>
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To guarantee opening the file properly in Excel from IE, write out your file to a
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temporary file under your web root from your servelet. Then send an http response
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to the browser to do a client side redirection to your temp file. (If you do a
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server side redirect using RequestDispatcher, you will have to add .xls to the
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request as mentioned above.)
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to the browser to do a client side redirection to your temp file. (Note that using a
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server side redirect using RequestDispatcher will not be effective in this case)
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</p>
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<p>
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Note also that when you request a document that is opened with an
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@ -171,25 +167,17 @@
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so to support localization you should use Unicode.
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To do it you should set it manually:
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<source>
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//
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// for sheet name
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//
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HSSFWorkbook wb = new HSSFWorkbook();
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HSSFSheet s = wb.createSheet();
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wb.setSheetName( 0, "SomeUnicodeName", HSSFWorkbook.ENCODING_UTF_16 );
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//
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// for cell value
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//
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HSSFRow r = s.createRow( 0 );
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HSSFCell c = r.createCell( (short)0 );
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c.setCellType( HSSFCell.CELL_TYPE_STRING );
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c.setEncoding( HSSFCell.ENCODING_UTF_16 );
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c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" );
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</source>
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c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" ); </source>
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Make sure you make the call to setEncoding() before calling setCellValue(), otherwise what you pass in won't be interpreted properly.
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</answer>
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</faq>
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@ -202,4 +190,82 @@
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Make sure you have fix pack 4 installed.
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</answer>
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</faq>
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<faq>
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<question> I am using styles when creating a workbook in POI, but Excel refuses to open the file, complaining about "Too Many Styles".
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</question>
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<answer>
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<p>You just create the styles OUTSIDE of the loop in which you create cells.</p>
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<p>GOOD:</p>
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<source>
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HSSFWorkbook wb = new HSSFWorkbook();
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HSSFSheet sheet = wb.createSheet("new sheet");
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HSSFRow row = null;
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// Aqua background
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HSSFCellStyle style = wb.createCellStyle();
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style.setFillBackgroundColor(HSSFColor.AQUA.index);
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style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
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HSSFCell cell = row.createCell((short) 1);
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cell.setCellValue("X");
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cell.setCellStyle(style);
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// Orange "foreground", foreground being the fill foreground not the font color.
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style = wb.createCellStyle();
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style.setFillForegroundColor(HSSFColor.ORANGE.index);
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style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
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for (int x = 0; x < 1000; x++) {
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// Create a row and put some cells in it. Rows are 0 based.
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row = sheet.createRow((short) k);
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for (int y = 0; y < 100; y++) {
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cell = row.createCell((short) k);
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cell.setCellValue("X");
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cell.setCellStyle(style);
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}
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}
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// Write the output to a file
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FileOutputStream fileOut = new FileOutputStream("workbook.xls");
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wb.write(fileOut);
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fileOut.close(); </source>
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<p>BAD:</p>
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<source>
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HSSFWorkbook wb = new HSSFWorkbook();
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HSSFSheet sheet = wb.createSheet("new sheet");
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HSSFRow row = null;
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for (int x = 0; x < 1000; x++) {
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// Aqua background
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HSSFCellStyle style = wb.createCellStyle();
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style.setFillBackgroundColor(HSSFColor.AQUA.index);
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style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
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HSSFCell cell = row.createCell((short) 1);
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cell.setCellValue("X");
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cell.setCellStyle(style);
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// Orange "foreground", foreground being the fill foreground not the font color.
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style = wb.createCellStyle();
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style.setFillForegroundColor(HSSFColor.ORANGE.index);
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style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
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// Create a row and put some cells in it. Rows are 0 based.
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row = sheet.createRow((short) k);
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for (int y = 0; y < 100; y++) {
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cell = row.createCell((short) k);
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cell.setCellValue("X");
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cell.setCellStyle(style);
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}
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}
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// Write the output to a file
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FileOutputStream fileOut = new FileOutputStream("workbook.xls");
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wb.write(fileOut);
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fileOut.close(); </source>
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</answer>
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</faq>
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</faqs>
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