Example using low level API POI for generating Excel??

Question

Hi
is anyone know good URL that teaches generating Excel using low level API using Apache POI?
The reason is because i want to set the password for either workbook/sheet in high level API but it cant be done.
the only thing can be done using High level API is protect sheet without password.
Any idea?
Thanks

Answer 1

There is quite a good pack of documentation that ships with HSSF. To answer your question, I have just gone to the how to page and copied the example below, hope it helps.
short rownum;
// create a new file
FileOutputStream out = new FileOutputStream("workbook.xls");
// create a new workbook
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 3 cell styles
HSSFCellStyle cs = wb.createCellStyle();
HSSFCellStyle cs2 = wb.createCellStyle();
HSSFCellStyle cs3 = 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
f.setFontHeightInPoints((short) 12);
//make it blue
f.setColor( (short)0xc );
// make it bold
//arial is the default font
f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//set font 2 to 10 point type
f2.setFontHeightInPoints((short) 10);
//make it red
f2.setColor( (short)HSSFFont.COLOR_RED );
//make it bold
f2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
f2.setStrikeout( true );
//set cell stlye
cs.setFont(f);
//set the cell format
cs.setDataFormat(df.getFormat("#,##0.0"));
//set a thin border
cs2.setBorderBottom(cs2.BORDER_THIN);
//fill w fg fill color
cs2.setFillPattern((short) HSSFCellStyle.SOLID_FOREGROUND);
//set the cell format to text see HSSFDataFormat for a full list
cs2.setDataFormat(HSSFDataFormat.getBuiltinFormat("text"));
// set the font
cs2.setFont(f2);
// set the sheet name in Unicode
wb.setSheetName(0, "\u0422\u0435\u0441\u0442\u043E\u0432\u0430\u044F " +
                   "\u0421\u0442\u0440\u0430\u043D\u0438\u0447\u043A\u0430",
                HSSFWorkbook.ENCODING_UTF_16 );
// in case of compressed Unicode
// wb.setSheetName(0, "HSSF Test", HSSFWorkbook.ENCODING_COMPRESSED_UNICODE );
// create a sheet with 30 rows (0-29)
for (rownum = (short) 0; rownum < 30; rownum++)
    // create a row
    r = s.createRow(rownum);
    // on every other row
    if ((rownum % 2) == 0)
        // make the row height bigger  (in twips - 1/20 of a point)
        r.setHeight((short) 0x249);
    //r.setRowNum(( short ) rownum);
    // create 10 cells (0-9) (the += 2 becomes apparent later
    for (short cellnum = (short) 0; cellnum < 10; cellnum += 2)
        // create a numeric cell
        c = r.createCell(cellnum);
        // do some goofy math to demonstrate decimals
        c.setCellValue(rownum * 10000 + cellnum
                + (((double) rownum / 1000)
                + ((double) cellnum / 10000)));
        String cellValue;
        // create a string cell (see why += 2 in the
        c = r.createCell((short) (cellnum + 1));
        // on every other row
        if ((rownum % 2) == 0)
            // set this cell to the first cell style we defined
            c.setCellStyle(cs);
            // set the cell's string value to "Test"
            c.setEncoding( HSSFCell.ENCODING_COMPRESSED_UNICODE );
            c.setCellValue( "Test" );
        else
            c.setCellStyle(cs2);
            // set the cell's string value to "\u0422\u0435\u0441\u0442"
            c.setEncoding( HSSFCell.ENCODING_UTF_16 );
            c.setCellValue( "\u0422\u0435\u0441\u0442" );
        // make this column a bit wider
        s.setColumnWidth((short) (cellnum + 1), (short) ((50 * 8) / ((double) 1 / 20)));
//draw a thick black border on the row at the bottom using BLANKS
// advance 2 rows
rownum++;
rownum++;
r = s.createRow(rownum);
// define the third style to be the default
// except with a thick black border at the bottom
cs3.setBorderBottom(cs3.BORDER_THICK);
//create 50 cells
for (short cellnum = (short) 0; cellnum < 50; cellnum++)
    //create a blank type cell (no value)
    c = r.createCell(cellnum);
    // set it to the thick black border style
    c.setCellStyle(cs3);
//end draw thick black border
// demonstrate adding/naming and deleting a sheet
// create a sheet, set its title then delete it
s = wb.createSheet();
wb.setSheetName(1, "DeletedSheet");
wb.removeSheetAt(1);
//end deleted sheet
// write the workbook to the output stream
// close our file (don't blow out our file handles
wb.write(out);
out.close();