在web開發中，有一個經典的功能，就是資料的匯入匯出。特別是資料的匯出，在生產管理或者財務系統中用的非常普遍，因為這些系統經常要做一些報表列印的工作。而資料匯出的格式一般是EXCEL。

        現在主流的操作Excel檔案的開源工具有很多,用得比較多的就是Apache的POI及JExcelAPI。這裡我們用Apache POI！我們先去Apache的大本營下載POI的jar包：http://poi.apache.org/ 。

在這裡我抽出來我專案中的一段程式碼測試版的程式碼給大家演示，基本滿足資料的匯出需求

public class PoiToExcelTestAction  extends BaseAction<Staff>{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public  String stafftoExcel() throws Exception { 
    //獲取所有員工集合
	List<Staff> staffList=	this.staffService.findAll();
	System.out.println(staffList.size());
    // 獲取總列數  
    int CountColumnNum =18; //xls.size();
    // 建立Excel文件  
    @SuppressWarnings("resource")
	HSSFWorkbook hwb = new HSSFWorkbook();  
    
 //   Admin xlsDto = null;  
    // sheet 對應一個工作頁  
    HSSFSheet sheet = hwb.createSheet("人員資訊表"); 
    HSSFSheet sheet2 = hwb.createSheet("管理員資訊表2");
    
    //第一個工作頁的內容 
    HSSFRow firstrow = sheet.createRow(0); // 下標為0的行開始  
    HSSFCell[] firstcell = new HSSFCell[CountColumnNum];  
    String[] names = new String[CountColumnNum];  
    names[0] = "姓名";  
    names[1] = "性別";  
    names[2] = "年齡";  
    names[3] = "身份證號碼";  
    names[4] = "手機號碼";
    names[5] = "員工編號";
    names[6] = "服務次數";
    names[7] = "滿意度";  
    names[8] = "員工郵箱";  
    names[9] = "微訊號碼";  
    names[10] = "入職時間";
    names[11] = "在職狀態";
    names[12] = "許可權";
    names[13] = "登陸使用者名稱";
    names[14] = "員工備註";
    names[15] = "登陸密碼";
    names[16] = "員工預約服務數";
    names[17] = "工作報告數";
    for (int j = 0; j < CountColumnNum; j++) {  
        firstcell[j] = firstrow.createCell(j);  
        firstcell[j].setCellValue(new HSSFRichTextString(names[j]));  
    }  
    for (int i = 0; i <staffList.size(); i++) {  
        // 建立一行  
    HSSFRow row = sheet.createRow(i+1);  
        // 得到要插入的每一條記錄  
        Staff staff = staffList.get(i);  
        for (int colu = 0; colu <= CountColumnNum; colu++) {  
            // 在一行內迴圈  
            HSSFCell name = row.createCell(0); 
            name.setCellValue(staff.getStaffName());  
            
            HSSFCell xm = row.createCell(1);  
            xm.setCellValue(staff.getSex());  
            
            HSSFCell yxsmc = row.createCell(2);  
            yxsmc.setCellValue(staff.getAge());  
            
            HSSFCell kcm = row.createCell(3);  
            kcm.setCellValue(staff.getIdcard());  
            
            HSSFCell cj = row.createCell(4);  
            cj.setCellValue(staff.getPhoneNum());
            
            HSSFCell zk = row.createCell(5);  
            zk.setCellValue(staff.getPhoneNum());
            
            HSSFCell time = row.createCell(6);  
            time.setCellValue(staff.getStaffCode());
            
            HSSFCell xh = row.createCell(7); 
            xh.setCellValue(staff.getServiceNum());  
            
            HSSFCell email = row.createCell(8);  
            email.setCellValue(staff.getStaffEmail());  
            
            HSSFCell wx = row.createCell(9);  
            wx.setCellValue(staff.getWeixinNum());  
            
            HSSFCell time1 = row.createCell(10);  
            time1.setCellValue(staff.getJoinTime());  
            
            HSSFCell zz = row.createCell(11);  
            zz.setCellValue(staff.getNowState());
            
            HSSFCell qx = row.createCell(12);  
            qx.setCellValue(staff.getStorerole().toString());
            
            HSSFCell longinname = row.createCell(13);  
            longinname.setCellValue(staff.getLoginname());
            
            
            HSSFCell bz = row.createCell(14);  
            bz.setCellValue(staff.getStaffDetail());  
            
            HSSFCell loginpas = row.createCell(15); 
            loginpas.setCellValue(staff.getLoginpassword());  
            
            HSSFCell xiaofei = row.createCell(16);  
            xiaofei.setCellValue(staff.getXiaoFeies().size());  
            
            HSSFCell bg = row.createCell(17);  
            bg.setCellValue(staff.getReports().size());  
            
           
        }  
    }
        //第二個工作頁內容
        HSSFRow firstrow1 = sheet2.createRow(0); // 下標為0的行開始  
        HSSFCell[] firstcell1 = new HSSFCell[7];  
        String[] names1 = new String[7];  
        names1[0] = "測試";  
        names1[1] = "測試";  
        names1[2] = "測試";  
        names1[3] = "測試";  
        names1[4] = "測試";
        names1[5] = "職務";
        names1[6] = "註冊時間";
        for (int j = 0; j < 7; j++) {  
            firstcell1[j] = firstrow1.createCell(j);  
            firstcell1[j].setCellValue(new HSSFRichTextString(names1[j]));  
        }  
     //   for (int i = 0; i < xls.size(); i++) {  
            // 建立一行  
        HSSFRow row1 = sheet2.createRow(1);  
            // 得到要插入的每一條記錄  
       //     xlsDto = xls.get(i);  
            for (int colu = 0; colu <= CountColumnNum; colu++) {  
                // 在一行內迴圈  
                HSSFCell xh = row1.createCell(0); 
                xh.setCellValue("132");  
                
                HSSFCell xm = row1.createCell(1);  
                xm.setCellValue("132");  
                
                HSSFCell yxsmc = row1.createCell(2);  
                yxsmc.setCellValue("132");  
                
                HSSFCell kcm = row1.createCell(3);  
                kcm.setCellValue("123");  
                
                HSSFCell cj = row1.createCell(4);  
                cj.setCellValue("123");
                
                HSSFCell zk = row1.createCell(5);  
                zk.setCellValue("123");
                
                HSSFCell time = row1.createCell(6);  
                time.setCellValue(new Date().toString());
            }  
   // }  
    // 建立檔案輸出流，準備輸出電子表格  
   try{
	   OutputStream out = new FileOutputStream("e:管理員資訊表.xls"); 
	    hwb.write(out);   
	    out.close();
	    System.out.println("資料庫匯出成功");
   }catch(Exception ex){
	   
	   
   }
	return null;  
}  
}