springmvc文件上传和下载

首先你要搭建一个ssm的框架,笔者使用的是maven搭建的框架。

文件上传:

1. 添加依赖:

 1 <dependency>
 2     <groupId>commons-io</groupId>
 3     <artifactId>commons-io</artifactId>
 4     <version>2.4</version>
 5 </dependency>
 6 <dependency>
 7     <groupId>commons-fileupload</groupId>
 8     <artifactId>commons-fileupload</artifactId>
 9     <version>1.2.1</version>
10 </dependency>

2. 在springmvc配置文件中,配置MultipartResolver:

1 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
2     <property name="maxUploadSize" value="100000000"/>
3     <property name="defaultEncoding" value="UTF-8"/>
4 </bean>

3. 编写jsp页面:

1 <body>
2     <form action="upload" method="post" enctype="multipart/form-data">
3         文件:<input type="file" name="file" /><input type="submit" value="上传" />
4     </form>
5 </body>

4. 编写文件上传处理器:

 1     /**
 2      * 上传文件测试
 3      * 
 4      * @param file
 5      * @param req
 6      * @return
 7      */
 8     @RequestMapping("/upload")
 9     @ResponseBody
10     public Object fileupload(@RequestParam("file") CommonsMultipartFile file) {
11         // 设置上传文件的路径
12         String path = "C:\\Users\\SKYER\\Desktop";
13         // 获取原始文件名
14         String fileName = file.getOriginalFilename();
15         try {
16             InputStream is = file.getInputStream();
17             File folder = new File(path);
18             if (!folder.exists())
19                 folder.mkdirs();
20             File saveFile = new File(folder, fileName);
21             OutputStream os = new FileOutputStream(saveFile);
22             byte[] buffer = new byte[1024];
23             int len = 0;
24             while ((len = is.read(buffer)) != -1)
25                 os.write(buffer, 0, len);
26             os.close();
27             is.close();
28         } catch (Exception e) {
29             e.printStackTrace();
30         }
31         return "success!";
32     }

文件下载:(在上述文件上传基础上添加代码)

1. jsp页面:

1 <body>
2     <form action="download" method="post">
3         <input type="hidden" name="fileName" value="154.jpg">
4         <input type="submit" value="下载文档">
5     </form>
6 </body>

2. 文件下载处理器:

 1     /**
 2      * 文件下载测试
 3      * 
 4      * @param fileName
 5      * @param req
 6      * @param resp
 7      * @return
 8      */
 9     @RequestMapping("/download")
10     public String downloadFile(String fileName, HttpServletResponse resp) {
11         if (fileName != null) {
12             // 文件所在路径
13             String realPath = "C:\\Users\\Nemo\\Desktop";
14             File file = new File(realPath, fileName);
15             if (file.exists()) {
16                 resp.setContentType("application/force-download"); // 设置强制下载不打开
17                 resp.addHeader("Content-Disposition", "attachment;fileName=" + fileName); // 设置文件名
18                 byte[] buffer = new byte[1024];
19                 FileInputStream fis = null;
20                 BufferedInputStream bis = null;
21                 try {
22                     fis = new FileInputStream(file);
23                     bis = new BufferedInputStream(fis);
24                     OutputStream os = resp.getOutputStream();
25                     int i = bis.read(buffer);
26                     while (i != -1) {
27                         os.write(buffer, 0, i);
28                         i = bis.read(buffer);
29                     }
30                 } catch (Exception e) {
31                     e.printStackTrace();
32                 } finally {
33                     if (bis != null) {
34                         try {
35                             bis.close();
36                         } catch (IOException e) {
37                             e.printStackTrace();
38                         }
39                     }
40                     if (fis != null) {
41                         try {
42                             fis.close();
43                         } catch (IOException e) {
44                             e.printStackTrace();
45                         }
46                     }
47                 }
48             }
49         }
50         return null;
51     }
posted @ 2017-04-12 14:50  我滴个小张张  阅读(184)  评论(0编辑  收藏  举报