建立Controller：
1 package com.yas.controller;
2
3 import org.apache.commons.io.IOUtils;
4 import org.springframework.stereotype.Controller;
5 import org.springframework.web.bind.annotation.RequestMapping;
6 import org.springframework.web.bind.annotation.RequestParam;
7
8 import javax.servlet.http.HttpServletResponse;
9 import javax.servlet.http.HttpSession;
10 import java.io.FileInputStream;
11 import java.io.IOException;
12
13 @Controller
14 @RequestMapping("/download")
15 public class DownloadController {
16
17 @RequestMapping("/test1")
18 public void test1(@RequestParam("name") String name, HttpSession session, HttpServletResponse response) throws IOException {
19 String realPath = session.getServletContext().getRealPath("/upload");
20 String filePath = realPath + "\\" + name;
21 response.setHeader("content-disposition", "attachment;filename=" + name);
22 IOUtils.copy(new FileInputStream(filePath), response.getOutputStream());
23 }
24 }
IOUtils，所在的包是org.apache.commons.io.IOUtils，在上一篇文章中，已经在pom文件中添加了此依赖。
建立测试jsp页面：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/download/test1?name=readme.txt">下载</a>
</body>
</html>