FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
13.在EXCEL單元格中使用自動換行
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet s = wb.createSheet();
    HSSFRow r = null;
    HSSFCell c = null;
    HSSFCellStyle cs = wb.createCellStyle();
    HSSFFont f = wb.createFont();
    HSSFFont f2 = wb.createFont();    cs = wb.createCellStyle();    cs.setFont( f2 );
    //Word Wrap MUST be turned on
    cs.setWrapText( true );    r = s.createRow( (short) 2 );
    r.setHeight( (short) 0x349 );
    c = r.createCell( (short) 2 );
    c.setCellType( HSSFCell.CELL_TYPE_STRING );
    c.setCellValue( "Use \n with word wrap on to create a new line" );
    c.setCellStyle( cs );
    s.setColumnWidth( (short) 2, (short) ( ( 50 * 8 ) / ( (double) 1 / 20 ) ) );    FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
    wb.write( fileOut );
    fileOut.close();
14.數字格式自定義
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("format sheet");
    HSSFCellStyle style;
    HSSFDataFormat format = wb.createDataFormat();
    HSSFRow row;
    HSSFCell cell;
    short rowNum = 0;
    short colNum = 0;    row = sheet.createRow(rowNum++);
    cell = row.createCell(colNum);
    cell.setCellValue(11111.25);
    style = wb.createCellStyle();
    style.setDataFormat(format.getFormat("0.0"));
    cell.setCellStyle(style);    row = sheet.createRow(rowNum++);
    cell = row.createCell(colNum);
    cell.setCellValue(11111.25);
    style = wb.createCellStyle();
    style.setDataFormat(format.getFormat("#,##0.0000"));
    cell.setCellStyle(style);    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
15.調整工作單位置
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("format sheet");
    HSSFPrintSetup ps = sheet.getPrintSetup();    sheet.setAutobreaks(true);    ps.setFitHeight((short)1);
    ps.setFitWidth((short)1);
    // Create various cells and rows for spreadsheet.    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
16.設置打印區域
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("Sheet1");
    wb.setPrintArea(0, "$A$1:$C$2");
    //sets the print area for the first sheet
    //Alternatively:
    //wb.setPrintArea(0, 0, 1, 0, 0) is equivalent to using the name reference (See the JavaDocs for more details)    // Create various cells and rows for spreadsheet.    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
17.標注腳注
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("format sheet");
    HSSFFooter footer = sheet.getFooter()    footer.setRight( "Page " + HSSFFooter.page() + " of " + HSSFFooter.numPages() );    // Create various cells and rows for spreadsheet.    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
18.使用方便的內部提供的函數
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet1 = wb.createSheet( "new sheet" );    // Create a merged region
    HSSFRow row = sheet1.createRow( (short) 1 );
    HSSFRow row2 = sheet1.createRow( (short) 2 );
    HSSFCell cell = row.createCell( (short) 1 );
    cell.setCellValue( "This is a test of merging" );
    Region region = new Region( 1, (short) 1, 4, (short) 4 );
    sheet1.addMergedRegion( region );    // Set the border and border colors.
    final short borderMediumDashed = HSSFCellStyle.BORDER_MEDIUM_DASHED;
    HSSFRegionUtil.setBorderBottom( borderMediumDashed,
        region, sheet1, wb );
    HSSFRegionUtil.setBorderTop( borderMediumDashed,
        region, sheet1, wb );
    HSSFRegionUtil.setBorderLeft( borderMediumDashed,
        region, sheet1, wb );
    HSSFRegionUtil.setBorderRight( borderMediumDashed,
        region, sheet1, wb );
    HSSFRegionUtil.setBottomBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
    HSSFRegionUtil.setTopBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
    HSSFRegionUtil.setLeftBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);
    HSSFRegionUtil.setRightBorderColor(HSSFColor.AQUA.index, region, sheet1, wb);    // Shows some usages of HSSFCellUtil
    HSSFCellStyle style = wb.createCellStyle();
    style.setIndention((short)4);
    HSSFCellUtil.createCell(row, 8, "This is the value of the cell", style);
    HSSFCell cell2 = HSSFCellUtil.createCell( row2, 8, "This is the value of the cell");
    HSSFCellUtil.setAlignment(cell2, wb, HSSFCellStyle.ALIGN_CENTER);    // Write out the workbook
    FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
    wb.write( fileOut );
    fileOut.close();
19.在工作單中移動行，調整行的上下位置
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("row sheet");    // Create various cells and rows for spreadsheet.    // Shift rows 6 - 11 on the spreadsheet to the top (rows 0 - 5)
    sheet.shiftRows(5, 10, -5);    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
20.選種指定的工作單
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("row sheet");
    sheet.setSelected(true);    // Create various cells and rows for spreadsheet.    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
21.工作單的放大縮小
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet1 = wb.createSheet("new sheet");
    sheet1.setZoom(3,4);   // 75 percent magnification
    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
22.頭注和腳注
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("new sheet");    HSSFHeader header = sheet.getHeader();
    header.setCenter("Center Header");
    header.setLeft("Left Header");
    header.setRight(HSSFHeader.font("Stencil-Normal", "Italic") +
                    HSSFHeader.fontSize((short) 16) + "Right w/ Stencil-Normal Italic font and size 16");    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
    wb.write(fileOut);
    fileOut.close();
//-------------------------------以上實例代碼均來自官方網站//-------------------------------POI中使用的顏色是用顏色索引來實現，如下：   /*
    * 顏色對照表 數字代表顏色索引
        8： BLACK
        60： BROWN
        59： OLIVE_GREEN
        58： DARK_GREEN
        56： DARK_TEAL
        18： DARK_BLUE
        32： DARK_BLUE
        62： INDIGO
        63： GREY_80_PERCENT
        53： ORANGE
        19： DARK_YELLOW
        17： GREEN
        21： TEAL
        38： TEAL
        12： BLUE
        39： BLUE
        54： BLUE_GREY
        23： GREY_50_PERCENT
        10： RED
        52： LIGHT_ORANGE
        50： LIME
        57： SEA_GREEN
        49： AQUA
        48： LIGHT_BLUE
        20： VIOLET
        36： VIOLET
        55： GREY_40_PERCENT
        14： PINK
        33： PINK
        51： GOLD
        13： YELLOW
        34： YELLOW
        11： BRIGHT_GREEN
        35： BRIGHT_GREEN
        15： TURQUOISE
        35： TURQUOISE
        16： DARK_RED
        37： DARK_RED
        40： SKY_BLUE
        61： PLUM
        25： PLUM
        22： GREY_25_PERCENT
        45： ROSE
        43： LIGHT_YELLOW
        42： LIGHT_GREEN
        41： LIGHT_TURQUOISE
        27：LIGHT_TURQUOISE
        44： PALE_BLUE
        46： LAVENDER
        9： WHITE
        24： CORNFLOWER_BLUE
        26： LEMON_CHIFFON
        25： MAROON
        28： ORCHID
        29： CORAL
        30： ROYAL_BLUE
        31： LIGHT_CORNFLOWER_BLUE
    *///----------------------------------------------------你可以按上面的方法來自定義顏色   /*
    * 自定義顏色，去掉注釋，貼加，其他則查看顏色對照表
   HSSFPalette palette = this.getCustomPalette();
   palette.setColorAtIndex(idx,
            i, //RGB red (0-255)
            j,    //RGB green
            k     //RGB blue
         );         
   *///---------------------------------------------------用以上的基礎知識我們就可以制作復雜的多表頭，控制元///格樣式的操作了，具體的代碼考慮到公司資產，所以隱去。