SpringMVC文件上传和下载
上传与下载
1文件上传
1.1加入jar包
文件上传需要依赖的jar包
1.2配置部件解析器
解析二进制流数据。
1 <?xml version="1.0" encoding="UTF-8"?>
2 <!-- 到入xml文件的约束 -->
3
4 <beans xmlns="http://www.springframework.org/schema/beans"
5 xmlns:context="http://www.springframework.org/schema/context"
6 xmlns:mvc="http://www.springframework.org/schema/mvc"
7 xmlns:p="http://www.springframework.org/schema/p"
8 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
9 xsi:schemaLocation="http://www.springframework.org/schema/beans
10 http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
11 http://www.springframework.org/schema/context
12 http://www.springframework.org/schema/context/spring-context-4.1.xsd
13 http://www.springframework.org/schema/mvc
14 http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
15 ">
16
17 <!-- 开启注解扫描（将对象纳入spring容器） -->
18 <context:component-scan base-package="org.guangsoft.controller">
19 </context:component-scan>
20
21 <!-- 开始springmvc的映射注解和适配注解 -->
22 <mvc:annotation-driven></mvc:annotation-driven>
23
24
25 <!-- 实例化文件上传的解析器（MIME） -->
26 <bean id="multipartResolver"
27 class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
28 <property name="defaultEncoding" value="utf-8"></property><!-- 客户端发送数据的编码 -->
29 <property name="maxUploadSize" value="5242880"></property><!-- 上传文件的大小 -->
30 <property name="uploadTempDir" value="/upload"></property>
31 </bean>
32
33 </beans>
1.3建立FileController
1 package org.guangsoft.controller;
2 import java.io.File;
3 import java.io.IOException;
4 import java.util.UUID;
5 import javax.servlet.http.HttpSession;
6 import org.apache.commons.io.FileUtils;
7 import org.springframework.http.HttpHeaders;
8 import org.springframework.http.HttpStatus;
9 import org.springframework.http.MediaType;
10 import org.springframework.http.ResponseEntity;
11 import org.springframework.stereotype.Controller;
12 import org.springframework.web.bind.annotation.RequestMapping;
13 import org.springframework.web.bind.annotation.RequestParam;
14 import org.springframework.web.multipart.commons.CommonsMultipartFile;
15 @Controller
16 public class FileController
17 {
18 /***
19 * 实现文件的上传
20 *
21 * @RequestParam:指定客户端发送数据的名字
22 * **/
23 @RequestMapping("/uploadFile")
24 public String uploadFile(@RequestParam("cmf") CommonsMultipartFile cmf,
25 HttpSession session)
26 {
27 // 1获得上传的文件内容
28 byte[] bytes = cmf.getBytes();
29 // 2获得upload的绝对路径
30 String path = session.getServletContext().getRealPath("/upload");
31 // 3在服务器的upload目录下创建File对象
32 String oname = cmf.getOriginalFilename(); // 上传文件的原始名字
33 String uuid = UUID.randomUUID().toString();
34 File file = new File(path, uuid
35 + oname.substring(oname.lastIndexOf(".")));
36 // 4将上传的文件拷贝到指定的目录
37 try
38 {
39 FileUtils.writeByteArrayToFile(file, bytes);
40 }
41 catch (IOException e)
42 {
43 e.printStackTrace();
44 }
45 return "index.jsp";
46 }
47 /***
48 * 实现文件下载
49 * ***/
50 @RequestMapping("/download")
51 public ResponseEntity download(HttpSession session)
52 {
53 // 用来封装响应头信息
54 HttpHeaders responseHeaders = new HttpHeaders();
55 // 下载的附件的类型
56 responseHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
57 // 下载的附件的名称
58 responseHeaders.setContentDispositionFormData("attachment", "1.png");
59 String path = session.getServletContext().getRealPath("/upload");
60 String fname = "b8abd107-ecdd-49ae-9175-b39f1d18a288.png"; // 数据库查询获得
61 // 将下载的文件封装流对象
62 File file = new File(path, fname);
63 try
64 {
65 /**
66 * arg1:需要响应到客户端的数据 arg2:设置本次请求的响应头 arg3:响应到客户端的状态码
67 * ***/
68 return new ResponseEntity(FileUtils.readFileToByteArray(file),
69 responseHeaders, HttpStatus.CREATED);
70 }
71 catch (IOException e)
72 {
73 e.printStackTrace();
74 }
75 return null;
76 }
77 }
1.4建立视图页面
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2 <%
3 String path = request.getContextPath();
4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5 %>
6
7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8 <html>
9 <head>
10 <base href="<%=basePath%>">
11 <title>upload</title>
12 <meta http-equiv="pragma" content="no-cache">
13 <meta http-equiv="cache-control" content="no-cache">
14 <meta http-equiv="expires" content="0">
15 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
16 <meta http-equiv="description" content="This is my page">
17 </head>
18
19 <body>
20 <form action="uploadFile.action" method="post"
21 enctype="multipart/form-data">
22 <div>file<input name="cmf" type="file"/></div>
23 <div> <input type="submit" value="提交"/></div>
24 </form>
25 <hr/>
26 <a href="download.action">下载</a>
27 </body>
28 </html>
2 文件下载
2.1建立下的handler方法
见上
