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：1.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。
2.关于Excel的各种操作，详情请转到http://www.yiibai.com/apache_poi/apache_poi_java_excel.html