java新建excel文件导出(HSSFWorkbook)

 public ActionForward exportExcel(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response){
         HttpSession session = request.getSession(true);
          String tile = "用户操作日志";
         try{
             HSSFWorkbook workbook = new HSSFWorkbook();
             //添加Worksheet（不添加sheet时生成的xls文件打开时会报错)
             HSSFSheet sheet = workbook.createSheet("Sheet1");
             HSSFCellStyle cellStyle = workbook.createCellStyle();
             cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("@"));
             HSSFRow row = sheet.createRow(0);
             /**
              * 合并单元格
              *    第一个参数：第一个单元格的行数（从0开始）
              *    第二个参数：第二个单元格的行数（从0开始）
              *    第三个参数：第一个单元格的列数（从0开始）
              *    第四个参数：第二个单元格的列数（从0开始）
              */
             sheet.addMergedRegion(new Region(0, (short)0, 0, (short)4));
             HSSFCell cell = row.createCell((short)0);
             // 定义单元格为字符串类型
             cell.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell.setCellValue(tile);
             row = sheet.createRow(1);
             HSSFCell cell1 = row.createCell((short)0);
             HSSFCell cell2 = row.createCell((short)1);
             HSSFCell cell3 = row.createCell((short)2);
             HSSFCell cell4 = row.createCell((short)3);
             HSSFCell cell5 = row.createCell((short)4);
             HSSFCell cell6 = row.createCell((short)5);
             HSSFCell cell7 = row.createCell((short)6);
             HSSFCell cell8 = row.createCell((short)7);
             // 定义单元格为字符串类型
             cell1.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell2.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell3.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell4.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell5.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell6.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell7.setCellType(HSSFCell.CELL_TYPE_STRING);
             cell8.setCellType(HSSFCell.CELL_TYPE_STRING);

             cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell3.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell4.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell5.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell6.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell7.setEncoding(HSSFCell.ENCODING_UTF_16);
             cell8.setEncoding(HSSFCell.ENCODING_UTF_16);

             // 在单元格中输入数据
             cell1.setCellValue("序号");
             cell2.setCellValue("账号");
             cell3.setCellValue("操作类型");
             cell4.setCellValue("一级模块");
             cell5.setCellValue("二级模块");
             cell6.setCellValue("操作对象");
             cell7.setCellValue("操作时间");
             cell8.setCellValue("操作结果");

             //sheet.setDefaultColumnWidth((short) 20);  //设置默认宽度
             sheet.setColumnWidth((short) 4, (short) 5120);
             sheet.setColumnWidth((short) 5, (short) 10240);
             sheet.setColumnWidth((short) 6, (short) 5120); 

             HttpSession sessionold = request.getSession(true);
             AccountInfo accountInfo = (AccountInfo) sessionold.getAttribute("accountInfo");
             OperationLogForm logForm = (OperationLogForm) form;
             LogService logSer = new LogService();
             String accountName = logForm.getAccountName();
             Vector<Hashtable<String, String>> logList = logSer.queryLog(logForm,accountName, -1,accountInfo.getAccountType());
             Hashtable data = null;
             for (int i = 0; i < logList.size(); i++){
                 data = logList.get(i);
                 row = sheet.createRow((short)(i + 2));
                 cell1 = row.createCell((short)0);
                 cell2 = row.createCell((short)1);
                 cell3 = row.createCell((short)2);
                 cell4 = row.createCell((short)3);
                 cell5 = row.createCell((short)4);
                 cell6 = row.createCell((short)5);
                 cell7 = row.createCell((short)6);
                 cell8 = row.createCell((short)7);
                 // 定义单元格为字符串类型
                 cell1.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                 cell2.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell3.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell4.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell5.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell6.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell7.setCellType(HSSFCell.CELL_TYPE_STRING);
                 cell8.setCellType(HSSFCell.CELL_TYPE_STRING);

                 cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell3.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell4.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell5.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell6.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell7.setEncoding(HSSFCell.ENCODING_UTF_16);
                 cell8.setEncoding(HSSFCell.ENCODING_UTF_16);

                 cell1.setCellValue(i+1);
                 cell2.setCellValue(data.get("username").toString());
                 if("1".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("新增");
                 }else if("2".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("修改");
                 }else if("4".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("审批");
                 }else if("5".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("否决");
                 }else if("6".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("分配角色");
                 }else if("7".equals(data.get("operatetype").toString())){
                     cell3.setCellValue("分配资源");
                 }else{
                     cell3.setCellValue("删除");
                 }
                 cell4.setCellValue(data.get("fmodulename").toString());
                 cell5.setCellValue(data.get("smodulename").toString());
                 cell6.setCellValue(data.get("operobj").toString());
                 cell7.setCellValue(data.get("operatetime1").toString());
                 if("0".equals(data.get("operateresult").toString())){
                     cell8.setCellValue("成功");
                 }else{
                     cell8.setCellValue("失败");
                 }
             }
             response.reset();
             response.setContentType("application/octet-stream;charset=GB2312");
             response.setHeader("Content-Disposition", "attachment; filename=\"OperationLog.xls\"");
             OutputStream out = response.getOutputStream();
             workbook.write(out);
             out.flush();
             out.close();
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }
         return null;
     }