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new faq on cell styles 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352966 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Avik Sengupta 2002-12-27 05:44:40 +00:00
parent 190e5073f6
commit 2b4020baf7
1 changed files with 83 additions and 17 deletions
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100
src/documentation/xdocs/faq.xml
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@ -66,7 +66,6 @@
Thanks to Jason Hoffman for providing the solution.
<source>
case HSSFCell.CELL_TYPE_NUMERIC:
double d = cell.getNumericCellValue();
// test if a date!
@ -78,9 +77,7 @@
cellText = cal.get(Calendar.MONTH)+1 + "/" +
cal.get(Calendar.DAY_OF_MONTH) + "/" +
cellText;
}
</source>
} </source>
</answer>
</faq>
<faq>
@ -93,7 +90,7 @@
screen. The problem persists even though you have set the correct mime type.
</p>
<p>
The short answer is, dont depend on IE to display a binary file type you an attachment properly if you stream it via a
The short answer is, dont depend on IE to display a binary file type properly if you stream it via a
servlet. Every minor version of IE has different bugs on this issue.
</p>
<p>
@ -112,9 +109,8 @@
<p>
To guarantee opening the file properly in Excel from IE, write out your file to a
temporary file under your web root from your servelet. Then send an http response
to the browser to do a client side redirection to your temp file. (If you do a
server side redirect using RequestDispatcher, you will have to add .xls to the
request as mentioned above.)
to the browser to do a client side redirection to your temp file. (Note that using a
server side redirect using RequestDispatcher will not be effective in this case)
</p>
<p>
Note also that when you request a document that is opened with an
@ -171,25 +167,17 @@
so to support localization you should use Unicode.
To do it you should set it manually:
<source>
//
// for sheet name
//
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName( 0, "SomeUnicodeName", HSSFWorkbook.ENCODING_UTF_16 );
//
// for cell value
//
HSSFRow r = s.createRow( 0 );
HSSFCell c = r.createCell( (short)0 );
c.setCellType( HSSFCell.CELL_TYPE_STRING );
c.setEncoding( HSSFCell.ENCODING_UTF_16 );
c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" );
</source>
c.setCellValue( "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F" ); </source>
Make sure you make the call to setEncoding() before calling setCellValue(), otherwise what you pass in won't be interpreted properly.
</answer>
</faq>
@ -202,4 +190,82 @@
Make sure you have fix pack 4 installed.
</answer>
</faq>
<faq>
<question> I am using styles when creating a workbook in POI, but Excel refuses to open the file, complaining about "Too Many Styles".
</question>
<answer>
<p>You just create the styles OUTSIDE of the loop in which you create cells.</p>
<p>GOOD:</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = null;
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
for (int x = 0; x &lt; 1000; x++) {
// Create a row and put some cells in it. Rows are 0 based.
row = sheet.createRow((short) k);
for (int y = 0; y &lt; 100; y++) {
cell = row.createCell((short) k);
cell.setCellValue("X");
cell.setCellStyle(style);
}
}
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close(); </source>
<p>BAD:</p>
<source>
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFRow row = null;
for (int x = 0; x &lt; 1000; x++) {
// Aqua background
HSSFCellStyle style = wb.createCellStyle();
style.setFillBackgroundColor(HSSFColor.AQUA.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);
HSSFCell cell = row.createCell((short) 1);
cell.setCellValue("X");
cell.setCellStyle(style);
// Orange "foreground", foreground being the fill foreground not the font color.
style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.ORANGE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
// Create a row and put some cells in it. Rows are 0 based.
row = sheet.createRow((short) k);
for (int y = 0; y &lt; 100; y++) {
cell = row.createCell((short) k);
cell.setCellValue("X");
cell.setCellStyle(style);
}
}
// Write the output to a file
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close(); </source>
</answer>
</faq>
</faqs>