将Oracle数据库中的数据写入Excel

1.准备工作

Oracle数据库“TBYZB_FIELD_PRESSURE”表中数据如图：

Excel模板(201512.xls)：

2.任务说明

我们要完成的任务就是将表“TBYZB_FIELD_PRESSURE”中的数据，按照Excel模板(201512.xls)的样式导入到一个新的Excel中。即：Excel模板(201512.xls)不改变，生成一个和它一样的Excel并且导入数据。

3.关键代码

// 使用FieldPressEntity中的每一个entity，一个entity包含了所有属性
 public void insertintoExcel(String yyyy, String mm) throws Exception {
  List<FieldPressEntity> result = tyFieldPressDao.search(yyyy, mm);
  // 读取Excel的模板
  HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(new File(
    "D:/201512.xls")));
  HSSFSheet sheet = null;
  // 读取sheet的模板
  sheet = workbook.getSheetAt(0);
  // 定义行
  HSSFRow row;
  // 定义单元格
  HSSFCell cell;
  // for循环，循环目标为行循环
  for (int i = 0; i < result.size(); i++) {
   System.out.println(result.size());
   // 给e循环赋值
   FieldPressEntity e = result.get(i);
   // 循环行
   row = sheet.getRow(3 + i);
   // 给行内的单元格赋值
   cell = row.getCell(1);
   cell.setCellValue(e.getH17());
   System.out.println(i + "i内+" + e.getH17());
   cell = row.getCell(2);
   cell.setCellValue(e.getH18());
   System.out.println(i + "i内+" + e.getH18());
   cell = row.getCell(3);
   cell.setCellValue(e.getH19());
   System.out.println(i + "i内+" + e.getH19());
   cell = row.getCell(4);
   cell.setCellValue(e.getH20());
   System.out.println(i + "i内+" + e.getH20());
   cell = row.getCell(5);
   cell.setCellValue(e.getH21());
   System.out.println(i + "i内+" + e.getH21());
   cell = row.getCell(6);
   cell.setCellValue(e.getH22());
   System.out.println(i + "i内+" + e.getH22());
   cell = row.getCell(7);
   cell.setCellValue(e.getH23());
   System.out.println(i + "i内+" + e.getH23());
   cell = row.getCell(8);
   cell.setCellValue(e.getH00());
   System.out.println(i + "i内+" + e.getH00());
   cell = row.getCell(9);
   cell.setCellValue(e.getH01());
   System.out.println(i + "i内+" + e.getH01());
   cell = row.getCell(10);
   cell.setCellValue(e.getH02());
   System.out.println(i + "i内+" + e.getH02());
   cell = row.getCell(11);
   cell.setCellValue(e.getH03());
   System.out.println(i + "i内+" + e.getH03());
   cell = row.getCell(12);
   cell.setCellValue(e.getH04());
   System.out.println(i + "i内+" + e.getH04());
   cell = row.getCell(13);
   cell.setCellValue(e.getH05());
   System.out.println(i + "i内+" + e.getH05());
   cell = row.getCell(14);
   cell.setCellValue(e.getH06());
   System.out.println(i + "i内+" + e.getH06());
   cell = row.getCell(15);
   cell.setCellValue(e.getH07());
   System.out.println(i + "i内+" + e.getH07());
   cell = row.getCell(16);
   cell.setCellValue(e.getH08());
   System.out.println(i + "i内+" + e.getH08());
   cell = row.getCell(17);
   cell.setCellValue(e.getH09());
   System.out.println(i + "i内+" + e.getH09());
   cell = row.getCell(18);
   cell.setCellValue(e.getH10());
   System.out.println(i + "i内+" + e.getH10());
   cell = row.getCell(19);
   cell.setCellValue(e.getH11());
   System.out.println(i + "i内+" + e.getH11());
   cell = row.getCell(20);
   cell.setCellValue(e.getH12());
   System.out.println(i + "i内+" + e.getH12());
   cell = row.getCell(21);
   cell.setCellValue(e.getH13());
   System.out.println(i + "i内+" + e.getH13());
   cell = row.getCell(22);
   cell.setCellValue(e.getH14());
   System.out.println(i + "i内+" + e.getH14());
   cell = row.getCell(23);
   cell.setCellValue(e.getH15());
   System.out.println(i + "i内+" + e.getH15());
   cell = row.getCell(24);
   cell.setCellValue(e.getH16());
   System.out.println(i + "i内+" + e.getH16());
   cell = row.getCell(25);
   cell.setCellValue(e.getDaily_sum());
   System.out.println(i + "i内+" + e.getDaily_sum());
   cell = row.getCell(26);
   cell.setCellValue(e.getDaily_avg());
   System.out.println(i + "i内+" + e.getDaily_avg());
   cell = row.getCell(27);
   cell.setCellValue(e.getDaily_max());
   System.out.println(i + "i内+" + e.getDaily_max());
   cell = row.getCell(28);
   cell.setCellValue(e.getDaily_min());
   System.out.println(i + "i内+" + e.getDaily_min());
  }
  // 写入一个新的Excel表内
  FileOutputStream out = new FileOutputStream(new File("E:/"+yyyy+mm+".xls"));
  // Excel表写入完成
  workbook.write(out);
  // Excel表退出
  out.close();
 }

总结：我们这个项目用的是ssh架构，如果想使用以上代码，需要按照ssh的规范，定义dao action service entity四个包，如果需要页面操作还需要js做页面。