將Oracle數據庫中的數據寫入Excel
1.准備工作
Oracle數據庫“TBYZB_FIELD_PRESSURE”表中數據如圖：
Excel模板(201512.xls)：
2.任務說明
我們要完成的任務就是將表“TBYZB_FIELD_PRESSURE”中的數據，按照Excel模板(201512.xls)的樣式導入到一個新的Excel中。即：Excel模板(201512.xls)不改變，生成一個和它一樣的Excel並且導入數據。
3.關鍵代碼
// 使用FieldPressEntity中的每一個entity，一個entity包含了所有屬性
public void insertintoExcel(String yyyy, String mm) throws Exception {
List<FieldPressEntity> result = tyFieldPressDao.search(yyyy, mm);
// 讀取Excel的模板
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(new File(
"D:/201512.xls")));
HSSFSheet sheet = null;
// 讀取sheet的模板
sheet = workbook.getSheetAt(0);
// 定義行
HSSFRow row;
// 定義單元格
HSSFCell cell;
// for循環，循環目標為行循環
for (int i = 0; i < result.size(); i++) {
System.out.println(result.size());
// 給e循環賦值
FieldPressEntity e = result.get(i);
// 循環行
row = sheet.getRow(3 + i);
// 給行內的單元格賦值
cell = row.getCell(1);
cell.setCellValue(e.getH17());
System.out.println(i + "i內+" + e.getH17());
cell = row.getCell(2);
cell.setCellValue(e.getH18());
System.out.println(i + "i內+" + e.getH18());
cell = row.getCell(3);
cell.setCellValue(e.getH19());
System.out.println(i + "i內+" + e.getH19());
cell = row.getCell(4);
cell.setCellValue(e.getH20());
System.out.println(i + "i內+" + e.getH20());
cell = row.getCell(5);
cell.setCellValue(e.getH21());
System.out.println(i + "i內+" + e.getH21());
cell = row.getCell(6);
cell.setCellValue(e.getH22());
System.out.println(i + "i內+" + e.getH22());
cell = row.getCell(7);
cell.setCellValue(e.getH23());
System.out.println(i + "i內+" + e.getH23());
cell = row.getCell(8);
cell.setCellValue(e.getH00());
System.out.println(i + "i內+" + e.getH00());
cell = row.getCell(9);
cell.setCellValue(e.getH01());
System.out.println(i + "i內+" + e.getH01());
cell = row.getCell(10);
cell.setCellValue(e.getH02());
System.out.println(i + "i內+" + e.getH02());
cell = row.getCell(11);
cell.setCellValue(e.getH03());
System.out.println(i + "i內+" + e.getH03());
cell = row.getCell(12);
cell.setCellValue(e.getH04());
System.out.println(i + "i內+" + e.getH04());
cell = row.getCell(13);
cell.setCellValue(e.getH05());
System.out.println(i + "i內+" + e.getH05());
cell = row.getCell(14);
cell.setCellValue(e.getH06());
System.out.println(i + "i內+" + e.getH06());
cell = row.getCell(15);
cell.setCellValue(e.getH07());
System.out.println(i + "i內+" + e.getH07());
cell = row.getCell(16);
cell.setCellValue(e.getH08());
System.out.println(i + "i內+" + e.getH08());
cell = row.getCell(17);
cell.setCellValue(e.getH09());
System.out.println(i + "i內+" + e.getH09());
cell = row.getCell(18);
cell.setCellValue(e.getH10());
System.out.println(i + "i內+" + e.getH10());
cell = row.getCell(19);
cell.setCellValue(e.getH11());
System.out.println(i + "i內+" + e.getH11());
cell = row.getCell(20);
cell.setCellValue(e.getH12());
System.out.println(i + "i內+" + e.getH12());
cell = row.getCell(21);
cell.setCellValue(e.getH13());
System.out.println(i + "i內+" + e.getH13());
cell = row.getCell(22);
cell.setCellValue(e.getH14());
System.out.println(i + "i內+" + e.getH14());
cell = row.getCell(23);
cell.setCellValue(e.getH15());
System.out.println(i + "i內+" + e.getH15());
cell = row.getCell(24);
cell.setCellValue(e.getH16());
System.out.println(i + "i內+" + e.getH16());
cell = row.getCell(25);
cell.setCellValue(e.getDaily_sum());
System.out.println(i + "i內+" + e.getDaily_sum());
cell = row.getCell(26);
cell.setCellValue(e.getDaily_avg());
System.out.println(i + "i內+" + e.getDaily_avg());
cell = row.getCell(27);
cell.setCellValue(e.getDaily_max());
System.out.println(i + "i內+" + e.getDaily_max());
cell = row.getCell(28);
cell.setCellValue(e.getDaily_min());
System.out.println(i + "i內+" + e.getDaily_min());
}
// 寫入一個新的Excel表內
FileOutputStream out = new FileOutputStream(new File("E:/"+yyyy+mm+".xls"));
// Excel表寫入完成
workbook.write(out);
// Excel表退出
out.close();
}
總結：1.我們這個項目用的是ssh架構，如果想使用以上代碼，需要按照ssh的規范，定義dao action service entity四個包，如果需要頁面操作還需要js做頁面。
2.關於Excel的各種操作，詳情請轉到http://www.yiibai.com/apache_poi/apache_poi_java_excel.html
