Apache POI —— HSSF / XSSF（1）

新建工作薄（NewWorkbook）

 

Workbook wb =new HSSFWorkbook(); FileOutputStream fileOut =new FileOutputStream("workbook.xls"); wb.write(fileOut); fileOut.close();   Workbook wb =new XSSFWorkbook(); FileOutputStream fileOut =new FileOutputStream("workbook.xlsx"); wb.write(fileOut); fileOut.close();

 

新建工作表（New Sheet）

Workbook wb =new HSSFWorkbook();// or new XSSFWorkbook(); Sheet sheet1 = wb.createSheet("new sheet"); Sheet sheet2 = wb.createSheet("second sheet"); //请注意，Excel工作表名称不得超过31个字符 //且不能包含任何如下字符： // 0x0000 // 0x0003 //冒号colon (:) //反斜杠backslash (\) //星号asterisk (*) //问号question mark (?) //斜杠forward slash (/) //打开方括号opening square bracket ([) //关闭方括号closing square bracket (])   //可以使用org.apache.poi.ss.util.WorkbookUtil#createSafeSheetName(String nameProposal)} //一个安全的方式用来创建工作表名,它将用空格（''）替换无效字符 String safeName = WorkbookUtil.createSafeSheetName("[O'Brien's sales*?]"); // returns " O'Brien's sales  " Sheet sheet3 = wb.createSheet(safeName);   FileOutputStream fileOut =new FileOutputStream("workbook.xls"); wb.write(fileOut); fileOut.close();

 

 

创建列（Creating Cells）

Workbook wb =new HSSFWorkbook(); // Workbook wb = new XSSFWorkbook(); CreationHelper createHelper = wb.getCreationHelper(); Sheet sheet = wb.createSheet("new sheet");   //创建一行,行号从0开始 Row row = sheet.createRow(0); //创建一列并设置值 Cell cell = row.createCell(0); cell.setCellValue(1);   //或使用一行完成 row.createCell(1).setCellValue(1.2); row.createCell(2).setCellValue(createHelper.createRichTextString("This is a string")); row.createCell(3).setCellValue(true);   //输出到一个文件 FileOutputStream fileOut =new FileOutputStream("workbook.xls"); wb.write(fileOut); fileOut.close();

创建列数据（CreatingDate Cells）

Workbook wb =new HSSFWorkbook(); // Workbook wb = new XSSFWorkbook(); CreationHelper createHelper = wb.getCreationHelper(); Sheet sheet = wb.createSheet("new sheet");   //创建一行 Row row = sheet.createRow(0);   //创建一列并设置一个日期值,这一个列是没有样式的 Cell cell = row.createCell(0); cell.setCellValue(new Date());   //为第二列指定列样式  CellStyle cellStyle = wb.createCellStyle(); cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("m/d/yy h:mm")); cell = row.createCell(1); cell.setCellValue(new Date()); cell.setCellStyle(cellStyle);   //还可以使用java.util.Calendar设置日期 cell = row.createCell(2); cell.setCellValue(Calendar.getInstance()); cell.setCellStyle(cellStyle);   //输出到文件 FileOutputStream fileOut =new FileOutputStream("workbook.xls"); wb.write(fileOut); fileOut.close();