--- /dev/null
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+<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd">
+
+<document>
+ <header>
+ <title>Converting existing HSSF Usermodel code to SS Usermodel (for XSSF and HSSF)</title>
+ <authors>
+ <person email="nick@apache.org" name="Nick Burch" id="NB"/>
+ </authors>
+ </header>
+ <body>
+ <section><title>Converting existing HSSF Usermodel code to SS Usermodel (for XSSF and HSSF)</title>
+
+ <section><title>Why change?</title>
+ <p>If you have existing HSSF usermodel code that works just
+ fine, and you don't want to use the new OOXML XSSF support,
+ then you probably don't need to. Your existing HSSF only code
+ will continue to work just fine.</p>
+ <p>However, if you want to be able to work with both HSSF for
+ your .xls files, and also XSSF for .xslx files, then you will
+ need to make some slight tweaks to your code.</p>
+ </section>
+ <section><title>org.apache.poi.ss.usermodel</title>
+ <p>The new SS usermodel (org.apache.poi.ss.usermodel) is very
+ heavily based on the old HSSF usermodel
+ (org.apache.poi.hssf.usermodel). The main difference is that
+ the package name and class names have been tweaked to remove
+ HSSF from them. Otherwise, the new SS Usermodel interfaces
+ should provide the same functionality.</p>
+ </section>
+ <section><title>Constructors</title>
+ <p>Calling the empty HSSFWorkbook remains as the way to
+ create a new, empty Workbook object. To open an existing
+ Worbook, you should now call WorkbookFactory.create(inp).</p>
+ <p>For all other cases when you would have called a
+ Usermodel constructor, such as 'new HSSFRichTextString()' or
+ 'new HSSFDataFormat', you should instead use a CreationHelper.
+ There's a method on the Workbook to get a CreationHelper, and
+ the CreationHelper will then handle constructing new objects
+ for you.</p>
+ </section>
+ <section><title>Other Code</title>
+ <p>For all other code, generally change a reference from
+ org.apache.poi.hssf.usermodel.HSSFFoo to a reference to
+ org.apache.poi.ss.usermodel.Foo. Method signatures should
+ otherwise remain the same, and it should all then work for
+ both XSSF and HSSF.</p>
+ </section>
+</section>
+<section><title>Worked Examples</title>
+ <section><title>Old HSSF Code</title>
+<source><![CDATA[
+// import org.apache.poi.hssf.usermodel.*;
+
+HSSFWorkbook wb = new HSSFWorkbook();
+// create a new sheet
+HSSFSheet s = wb.createSheet();
+// declare a row object reference
+HSSFRow r = null;
+// declare a cell object reference
+HSSFCell c = null;
+// create 2 cell styles
+HSSFCellStyle cs = wb.createCellStyle();
+HSSFCellStyle cs2 = wb.createCellStyle();
+HSSFDataFormat df = wb.createDataFormat();
+
+// create 2 fonts objects
+HSSFFont f = wb.createFont();
+HSSFFont f2 = wb.createFont();
+
+// Set font 1 to 12 point type, blue and bold
+f.setFontHeightInPoints((short) 12);
+f.setColor( (short)0xc );
+f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
+
+// Set font 2 to 10 point type, red and bold
+f2.setFontHeightInPoints((short) 10);
+f2.setColor( (short)HSSFFont.COLOR_RED );
+f2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
+
+// Set cell style and formatting
+cs.setFont(f);
+cs.setDataFormat(df.getFormat("#,##0.0"));
+
+// Set the other cell style and formatting
+cs2.setBorderBottom(cs2.BORDER_THIN);
+cs2.setDataFormat(HSSFDataFormat.getBuiltinFormat("text"));
+cs2.setFont(f2);
+
+
+// Define a few rows
+for(short rownum = (short)0; rownum < 30; rownum++) {
+ HSSFRow r = s.createRow(rownum);
+ for(short cellnum = (short)0; cellnum < 10; cellnum += 2) {
+ HSSFCell c = r.createCell(cellnum);
+ HSSFCell c2 = r.createCell(cellnum+1);
+
+ c.setCellValue((double)rownum + (cellnum/10));
+ c2.setCellValue(new HSSFRichTextString("Hello! " + cellnum);
+ }
+}
+
+// Save
+FileOutputStream out = new FileOutputStream("workbook.xls");
+wb.write(out);
+out.close();
+ ]]></source>
+ </section>
+ <section><title>New, generic SS Usermodel Code</title>
+<source><![CDATA[
+// import org.apache.poi.ss.usermodel.*;
+
+Workbook[] wbs = new Workbook[] { new HSSFWorkbook(), new XSSFWorkbook() };
+for(int i=0; i<wbs.length; i++) {
+ Workbook wb = wbs[i];
+ CreationHelper createHelper = wb.getCreationHelper();
+
+ // create a new sheet
+ Sheet s = wb.createSheet();
+ // declare a row object reference
+ Row r = null;
+ // declare a cell object reference
+ Cell c = null;
+ // create 2 cell styles
+ CellStyle cs = wb.createCellStyle();
+ CellStyle cs2 = wb.createCellStyle();
+ DataFormat df = wb.createDataFormat();
+
+ // create 2 fonts objects
+ Font f = wb.createFont();
+ Font f2 = wb.createFont();
+
+ // Set font 1 to 12 point type, blue and bold
+ f.setFontHeightInPoints((short) 12);
+ f.setColor( (short)0xc );
+ f.setBoldweight(Font.BOLDWEIGHT_BOLD);
+
+ // Set font 2 to 10 point type, red and bold
+ f2.setFontHeightInPoints((short) 10);
+ f2.setColor( (short)Font.COLOR_RED );
+ f2.setBoldweight(Font.BOLDWEIGHT_BOLD);
+
+ // Set cell style and formatting
+ cs.setFont(f);
+ cs.setDataFormat(df.getFormat("#,##0.0"));
+
+ // Set the other cell style and formatting
+ cs2.setBorderBottom(cs2.BORDER_THIN);
+ cs2.setDataFormat(df.getFormat("text"));
+ cs2.setFont(f2);
+
+
+ // Define a few rows
+ for(int rownum = 0; rownum < 30; rownum++) {
+ Row r = s.createRow(rownum);
+ for(int cellnum = 0; cellnum < 10; cellnum += 2) {
+ Cell c = r.createCell(cellnum);
+ Cell c2 = r.createCell(cellnum+1);
+
+ c.setCellValue((double)rownum + (cellnum/10));
+ c2.setCellValue(
+ createHelper.createRichTextString("Hello! " + cellnum)
+ );
+ }
+ }
+
+ // Save
+ String filename = "workbook.xls";
+ if(wb instanceof XSSFWorkbook) {
+ filename = filename + "x";
+ }
+
+ FileOutputStream out = new FileOutputStream(filename);
+ wb.write(out);
+ out.close();
+}
+ ]]></source>
+ </section>
+</section>
+</body>
+</document>
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