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How-to code examples fix. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352298 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Glen Stampoultzis 2002-03-30 06:12:30 +00:00
parent e91f14258e
commit bb124077b5
1 changed files with 120 additions and 142 deletions
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262
src/documentation/xdocs/hssf/how-to.xml
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@ -11,13 +11,6 @@
<body>
<s1 title="How to use the HSSF prototype API">
<s2 title="Recent revision history">
<ul>
<li>12.30.2001 - revised for poi 1.0-final - minor revisions</li>
<li>01.03.2001 - revised for poi 1.1-devel</li>
</ul>
</s2>
<s2 title="Capabilities">
<p>This release of the how-to outlines functionality for 1.5.
Those looking for information on the release edition should
@ -94,94 +87,99 @@ does not close it for you.
</p>
<p>Here is some example code (excerpted and adapted from
org.apache.poi.hssf.dev.HSSF test class):</p>
<source> // create a new file
FileOutputStream out = new FileOutputStream(&quot;/home/me/myfile.xls&quot;);
<source><![CDATA[ short rownum;
// create a new file
FileOutputStream out = new FileOutputStream("workbook.xls");
// create a new workbook
HSSFWorkbook wb = new HSSFWorkbook();
HSSFWorkbook wb = new HSSFWorkbook();
// create a new sheet
HSSFSheet s = wb.createSheet();
HSSFSheet s = wb.createSheet();
// declare a row object reference
HSSFRow r = null;
HSSFRow r = null;
// declare a cell object reference
HSSFCell c = null;
HSSFCell c = null;
// create 3 cell styles
HSSFCellStyle cs = wb.createCellStyle();
HSSFCellStyle cs2 = wb.createCellStyle();
HSSFCellStyle cs3 = wb.createCellStyle();
HSSFCellStyle cs = wb.createCellStyle();
HSSFCellStyle cs2 = wb.createCellStyle();
HSSFCellStyle cs3 = wb.createCellStyle();
// create 2 fonts objects
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
HSSFFont f = wb.createFont();
HSSFFont f2 = wb.createFont();
//set font 1 to 12 point type
f.setFontHeightInPoints((short)12);
f.setFontHeightInPoints((short) 12);
//make it red
f.setColor((short)0xA);
f.setColor((short) HSSFCellStyle.RED);
// make it bold
//arial is the default font
f.setBoldweight(f.BOLDWEIGHT_BOLD);
//set font 2 to 10 point type
f2.setFontHeightInPoints((short)10);
f2.setFontHeightInPoints((short) 10);
//make it the color at palette index 0xf (white)
f2.setColor((short)0xf);
f2.setColor((short) HSSFCellStyle.WHITE);
//make it bold
f2.setBoldweight(f2.BOLDWEIGHT_BOLD);
//set cell stlye
cs.setFont(f);
//set the cell format see HSSFDataFromat for a full list
cs.setDataFormat(HSSFDataFormat.getFormat(&quot;($#,##0_);[Red]($#,##0)&quot;));
cs.setDataFormat(HSSFDataFormat.getFormat("($#,##0_);[Red]($#,##0)"));
//set a thin border
cs2.setBorderBottom(cs2.BORDER_THIN);
//fill w fg fill color
cs2.setFillPattern((short)1);
cs2.setFillPattern((short) HSSFCellStyle.SOLID_FOREGROUND);
// set foreground fill to red
cs2.setFillForegroundColor((short)0xA);
cs2.setFillForegroundColor((short) HSSFCellStyle.RED);
// set the font
cs2.setFont(f2);
// set the sheet name to HSSF Test
wb.setSheetName(0,&quot;HSSF Test&quot;);
wb.setSheetName(0, "HSSF Test");
// create a sheet with 300 rows (0-299)
for (rownum = (short)0; rownum &lt; 300; rownum++)
for (rownum = (short) 0; rownum < 300; rownum++)
{
// create a row
r = s.createRow(rownum);
// on every other row
if ( (rownum % 2) == 0) {
if ((rownum % 2) == 0)
{
// make the row height bigger (in twips - 1/20 of a point)
r.setHeight((short)0x249);
r.setHeight((short) 0x249);
}
//r.setRowNum(( short ) rownum);
// create 50 cells (0-49) (the += 2 becomes apparent later
for (short cellnum = (short)0; cellnum &lt; 50; cellnum += 2)
for (short cellnum = (short) 0; cellnum < 50; cellnum += 2)
{
// create a numeric cell
c = r.createCell(cellnum,HSSFCell.CELL_TYPE_NUMERIC);
c = r.createCell(cellnum);
// do some goofy math to demonstrate decimals
c.setCellValue(rownum * 10000 + cellnum
+ ((( double ) rownum / 1000)
+ (( double ) cellnum / 10000)));
+ (((double) rownum / 1000)
+ ((double) cellnum / 10000)));
// on every other row
if ( (rownum % 2) == 0) {
if ((rownum % 2) == 0)
{
// set this cell to the first cell style we defined
c.setCellStyle(cs);
}
// create a string cell (see why += 2 in the
c = r.createCell((short)(cellnum+1),HSSFCell.CELL_TYPE_STRING);
c = r.createCell((short) (cellnum + 1));
// set the cell's string value to &quot;TEST&quot;
c.setCellValue(&quot;TEST&quot;);
// set the cell's string value to "TEST"
c.setCellValue("TEST");
// make this column a bit wider
s.setColumnWidth((short)(cellnum+1), (short)((50*8) / ((double)1/20)) );
s.setColumnWidth((short) (cellnum + 1), (short) ((50 * 8) / ((double) 1 / 20)));
// on every other row
if ( (rownum % 2) == 0) {
if ((rownum % 2) == 0)
{
// set this to the white on red cell style
// we defined above
c.setCellStyle(cs2);
@ -202,9 +200,10 @@ org.apache.poi.hssf.dev.HSSF test class):</p>
cs3.setBorderBottom(cs3.BORDER_THICK);
//create 50 cells
for (short cellnum = (short)0; cellnum &lt; 50; cellnum++) {
for (short cellnum = (short) 0; cellnum < 50; cellnum++)
{
//create a blank type cell (no value)
c = r.createCell(cellnum,HSSFCell.CELL_TYPE_BLANK);
c = r.createCell(cellnum);
// set it to the thick black border style
c.setCellStyle(cs3);
}
@ -215,7 +214,7 @@ org.apache.poi.hssf.dev.HSSF test class):</p>
// demonstrate adding/naming and deleting a sheet
// create a sheet, set its title then delete it
s = wb.createSheet();
wb.setSheetName(1,&quot;DeletedSheet&quot;);
wb.setSheetName(1, "DeletedSheet");
wb.removeSheetAt(1);
//end deleted sheet
@ -223,7 +222,7 @@ org.apache.poi.hssf.dev.HSSF test class):</p>
// close our file (don't blow out our file handles
wb.write(out);
out.close();
</source>
]]></source>
</s4>
<s4 title="Reading or modifying an existing file">
@ -281,119 +280,96 @@ registered to listen for until the file has been completely read.
<p>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>
<source>
//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;
<source><![CDATA[
/**
* This example shows how to use the event API for reading a file.
*/
public class EventExample
implements HSSFListener
{
private SSTRecord sstrec;
/**
* This method listens for incoming records and handles them as required.
* @param record The record that was found while reading.
*/
public void processRecord(Record record)
{
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)
{
System.out.println("Encountered workbook");
// assigned to the class level member
} else if (bof.getType() == bof.TYPE_WORKSHEET)
{
System.out.println("Encountered sheet reference");
}
break;
case BoundSheetRecord.sid:
BoundSheetRecord bsr = (BoundSheetRecord) record;
System.out.println("New sheet named: " + bsr.getSheetname());
break;
case RowRecord.sid:
RowRecord rowrec = (RowRecord) record;
System.out.println("Row found, first column at "
+ rowrec.getFirstCol() + " last column at " + rowrec.getLastCol());
break;
case NumberRecord.sid:
NumberRecord numrec = (NumberRecord) record;
System.out.println("Cell found with value " + numrec.getValue()
+ " at row " + numrec.getRow() + " and column " + numrec.getColumn());
break;
// SSTRecords store a array of unique strings used in Excel.
case SSTRecord.sid:
sstrec = (SSTRecord) record;
for (int k = 0; k < sstrec.getNumUniqueStrings(); k++)
{
System.out.println("String table value " + k + " = " + sstrec.getString(k));
}
break;
case LabelSSTRecord.sid:
LabelSSTRecord lrec = (LabelSSTRecord) record;
System.out.println("String cell found with value "
+ sstrec.getString(lrec.getSSTIndex()));
break;
}
}
// 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 {
/**
* Read an excel file and spit out what we find.
*
* @param args Expect one argument that is the file to read.
* @throws IOException When there is an error processing the file.
*/
public static void main(String[] args) throws IOException
{
// create a new file input stream with the input file specified
// at the command line
FileInputStream fin = new FileInputStream(infile);
FileInputStream fin = new FileInputStream(args[0]);
// create a new org.apache.poi.poifs.filesystem.Filesystem
Filesystem poifs = new Filesystem(fin);
POIFSFileSystem poifs = new POIFSFileSystem(fin);
// get the Workbook (excel part) stream in a InputStream
InputStream din = poifs.createDocumentInputStream(&quot;Workbook&quot;);
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));
req.addListenerForAllRecords(new EventExample());
// create our event factory
HSSFEventFactory factory = new HSSFEventFactory();
// process our events based on the document input stream
factory.processEvents(req,din);
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(&quot;done.&quot;);
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 &lt; 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;
}
}</source>
}
]]></source>
</s3>
<s3 title="Low Level APIs">
@ -427,13 +403,15 @@ export CLASSPATH=$CLASSPATH:$HSSFDIR/hssf.jar:$HSSFDIR/poi-poifs.jar:$HSSFDIR/po
</li><li>type:
<code>java org.apache.poi.hssf.dev.HSSF ~/myxls.xls write</code></li>
</ul>
<p></p>
<p>This should generate a test sheet in your home directory called <code>&quot;myxls.xls&quot;</code>. </p>
<ul>
<li>Type:
<code>java org.apache.poi.hssf.dev.HSSF ~/input.xls output.xls
<code>java org.apache.poi.hssf.dev.HSSF ~/input.xls output.xls</code>
<p>
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>
most likely fail. No big deal. </p></li>
</ul>
</s3>
<s3 title="HSSF Logging facility">
@ -510,7 +488,7 @@ intertwined. To use that just pass a file with a second argument
matching &quot;on&quot; exactly.</p>
<p>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>
yet. When it does something, we'll document it.</p>
</s3>
<s3 title="What's Next?">