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jfinal+poi匯出excel

廢話不說了,開始了!

 方案一:JFinal的renderFile("路徑")功能

  先說說我的邏輯:

    前臺頁面點選請求傳送到後臺Controller,然後Controller層主要根據所需條件進行表格的組裝,組裝好上傳到伺服器後,然後跳轉到前臺直接顯示下載框,下載即可。

前臺jsp部分:

<li><a class="icon" href="<%=basePath%>feedback/expFeedBack" ><span>匯出資訊</span></a></li>

Controller部分:

public void expFeedBack(){
      String time="";
      int count = 0;
      String mypath="";
      try {
       List<FeedBack> list = FeedBack.dao.find("select f.id,f.content,f.datatime,f.tele from feedback f");
       count = list.size();
       time = DateUtil.formatDate();
       String path = new File("").getAbsolutePath().replaceAll("\\\\", "/"); //獲得Tomcat的預設路徑
       mypath = path.substring(0,path.lastIndexOf("/"))+"/webapps/3d/excel/"+time+"-"+count+"條.xlsx"; //擷取字串
       FileOutputStream os = new FileOutputStream(mypath);
       Workbook workBook = new SXSSFWorkbook(100); // 只在記憶體中保留100行記錄
       Sheet  sheet = workBook.createSheet();
       try {
        int i=0;
        Row row1 = sheet.createRow(i++);
        Cell  cell = row1.createCell(0);
        cell.setCellValue("id"); 
        cell = row1.createCell(1);
        cell.setCellValue("反饋內容");
        cell = row1.createCell(2);
        cell.setCellValue("反饋時間"); 
        cell = row1.createCell(3);
        cell.setCellValue("聯絡方式");
        cell = row1.createCell(4);
        for (int j = 0; j < list.size(); j++) {
         row1 = sheet.createRow(i++);
         cell = row1.createCell(0);
         cell.setCellValue(list.get(j).getInt("id"));
         cell = row1.createCell(1);
         cell.setCellValue(list.get(j).getStr("content"));
         cell = row1.createCell(2);
         cell.setCellValue(list.get(j).getStr("datatime"));
         cell = row1.createCell(3);
         cell.setCellValue(list.get(j).getStr("tele"));
         cell = row1.createCell(4);
        }
        workBook.write(os);
       }catch(Exception e){
        e.printStackTrace();
       }
      } catch (FileNotFoundException e1) {
       e1.printStackTrace();
      }
      //判斷路徑是否存在
     if(new File(mypath).isFile()){
        renderFile(new File(mypath));
      }else{
        renderNull();
      }
  }


然後就愉快的可以下載了

方案二:jsp頁面做成的下載【給人以假象的感覺】

jsp匯出excel其實就是後臺查詢完資料放入list集合中,然後跳轉到jsp,然後jsp按照規定的格式顯示出來,並且前臺彈出框,所以就有了jsp下載excel

前臺jsp部分:

<li><a class="icon" href="<%=basePath%>feedback/expFeedBack" ><span>匯出資訊</span></a></li>

然後就是後臺部分:

setAttr("feedBackList", FeedBack.dao.find("select * from feedback"));
 renderJsp("/admin/download.jsp");

這裡的download.jsp是我做的一個下載彈出框要彈出格式的頁面,內容如下

<%@ page contentType="application/vnd.ms-excel; charset=gbk" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page language="java" pageEncoding="GBK" import="com.dxcm.common.util.*"%>
<%
 String time = DateUtil.formatDate();
    String filename = new String((time).getBytes("GBK"),"ISO-8859-1"); 
   
    response.setHeader("Content-disposition","attachment; filename="+filename+".xls");
%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body >
    <table border="1">
        <tr>
         <td>ID</td>
         <td>反饋內容</td>
         <td>反饋時間</td>
         <td>聯絡方式</td>
        </tr>
        <c:forEach items="${feedBackList}" var ="f">
         <tr>
          <td>${f.id}</td>
          <td>${f.content}</td>
          <td>${f.datatime}</td>
          <td>${f.tele}</td>
         </tr>
        </c:forEach>
 </table>
</body>
</html>


這裡我用的是EL表示式遍歷的後臺傳出來的集合。

以上程式碼屬本人歸納總結,如有問題,還請多多指教。