一步一步使用POI做java报表
读取和重写 WorkbooksPOIFSFileSystem fs =
new POIFSFileSystem(new FileInputStream("workbook.xls"));
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row = sheet.getRow(2);
HSSFCell cell = row.getCell((short)3);
if (cell == null)
cell = row.createCell((short)3);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("a test");
// 写入文件
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
在单元格中换行
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 );
//开启Word Wrap
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();
数据格式化
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();
使得一个Sheet适合一页
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);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
设置打印区域
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("Sheet1");
wb.setPrintArea(0, "$A$1:$C$2");
//为第一个Sheet页设置打印区域
//也可以这样
//wb.setPrintArea(0, 0, 1, 0, 0) ，详细参考java doc
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
设置页脚的页数
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("format sheet");
HSSFFooter footer = sheet.getFooter()
footer.setRight( "Page " HSSFFooter.page() " of " HSSFFooter.numPages() );
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
使用简便的函数
这些函数保存在contrib并且提供了一些使用特征功能，例如设置合并单元格的边框，不用创建新样式改变样式属性。
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet( "new sheet" );
// 合并单元格
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 );
// 设置边框和颜色.
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);
// 展示HSSFCellUtil类的用法
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);
// 写入文件
FileOutputStream fileOut = new FileOutputStream( "workbook.xls" );
wb.write( fileOut );
fileOut.close();
在Sheet页中上下移动行
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("row sheet");
//创建不同的行列
// 将6-11行移动到0-5行
sheet.shiftRows(5, 10, -5);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
设置一个Sheet页为被选中的
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("row sheet");
sheet.setSelected(true);
// 创建不同的行列。。。
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
设置放大属性
The zoom is expressed as a fraction. For example to express a zoom of 75% use 3 for the numerator and 4 for the denominator.
Zoom被明确为一个分数，例如下面的75%使用3作为分子，4作为分母。
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
sheet1.setZoom(3,4); // 75%放大
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
拆分和冻结窗口
这里有你创建的两种窗口：冻结窗口和拆分窗口。
一个冻结窗口是被行和列拆分开的，可以按照如下设置创建冻结窗口。
sheet1.createFreezePane( 3, 2, 3, 2 );
前两个参数是你要用来拆分的列数和行数。后两个参数是下面窗口的可见象限，其中第三个参数是右边区域可见的左边列数，第四个参数是下面区域可见的首行。
拆分可以将区域分成四个工作区。拆分发生在像素级别而且用户可以通过拖拽到新的位置来判断。
用如下方式拆分窗口:
sheet2.createSplitPane( 2000, 2000, 0, 0, HSSFSheet.PANE_LOWER_LEFT );
The first parameter is the x position of the split. This is in 1/20th of a point. A point in this case seems to equate to a pixel. The second parameter is the y position of the split. Again in 1/20th of a point.
第一个参数是拆分的x位置。这里单位是一个点的1/20，在这种比例下点看起来是一个像素。第二个参数是拆分的y位置，也是一个点的1/20。第三、四个参数同上。最后一个参数说明当前哪个窗口有焦点，四个选择HSSFSheet.PANE_LOWER_LEFT, PANE_LOWER_RIGHT, PANE_UPPER_RIGHT or PANE_UPPER_LEFT。
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
HSSFSheet sheet3 = wb.createSheet("third sheet");
HSSFSheet sheet4 = wb.createSheet("fourth sheet");
// 冻结第一行
sheet1.createFreezePane( 0, 1, 0, 1 );
// 冻结第一列
sheet2.createFreezePane( 1, 0, 1, 0 );
// 冻结列和行
sheet3.createFreezePane( 2, 2 );
// 拆分窗口并且使左下方有焦点
sheet4.createSplitPane( 2000, 2000, 0, 0, HSSFSheet.PANE_LOWER_LEFT );
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
反复的行和列（设置打印标题）
在打印输出的时候需要使用HSSFWorkbook类的setRepeatingRowsAndColumns()方法反复的设置行和列。
这个方法包含5个参数，第一个参数是Sheet页的索引（从0开始算），第二、三个参数是重写的列的范围。不使用重写功能的话可以设置-1代替。第四、五个参数是重写的行的范围。不使用重写功能的话可以设置-1代替。
HSSFWorkbook wb = new HSSFWorkbook();
上一页
HSSFSheet sheet1 = wb.createSheet("new sheet");
HSSFSheet sheet2 = wb.createSheet("second sheet");
// 第一个Sheet设置从0到2的列
wb.setRepeatingRowsAndColumns(0,0,2,-1,-1);
// 第二个Sheet设置行和列
wb.setRepeatingRowsAndColumns(1,4,5,1,2);
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
页眉和页脚
这是个页眉的例子，但是页脚也同样适用.
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(); 上一页
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