SpringMVC文件上传

 1 1.在SpringMVC中的配置文件dispatcherServlet-servlet.xml中加入
 2 
 3     <!-- 配置MultipartResolver，用于上传文件，使用spring的CommonsMultipartResolver -->  
 4     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
 5             <property name="maxUploadSize" value="5000000"/>
 6             <property name="defaultEncoding" value="UTF-8"/>
 7     </bean>
 8 
 9 
10 2.处理文件上传-单文件传-在controller类里添加
11     //文件上传
12     //添加用户时，为post请求，访问以下代码
13     @RequestMapping(value="/adduser",method=RequestMethod.POST)
14     public String add(@Validated User user,BindingResult bindingResult,MultipartFile attach,HttpServletRequest req){//紧跟validate之后写验证结果
15         if(bindingResult.hasErrors()){
16             System.out.println("@Validated User user-->"+user);
17             //若有错误，直接掉转到add 视图
18             return "user/add";
19         }
20         //判断文件是否为空
21         if(!attach.isEmpty()){
22             //指定文件上传位置
23             String realPath =  req.getSession().getServletContext().getRealPath("/resources/upload");
24             System.out.println("realPath===="+realPath);
25             System.out.println("原始文件的名字"+attach.getOriginalFilename());
26             System.out.println(attach.getContentType());
27             System.out.println(attach.getName());//得到页面表单控件的值
28             
29             //建立空文件
30             //File.separator="/",File.separator:路径自适应分隔符，适合其它操作系统， 
31             File file = new File(realPath+File.separator+attach.getOriginalFilename());
32             
33             try {
34                 FileUtils.copyInputStreamToFile(attach.getInputStream(), file);
35                 //FileUtils.writeByteArrayToFile(file, attach.getBytes());
36                 //attach.transferTo(file);
37             } catch (Exception e) {
38                 // TODO Auto-generated catch block
39                 e.printStackTrace();
40             }
41             System.out.println(attach.getName()+" ======= "+attach.getOriginalFilename()+" ====== "+attach.getContentType());
42         }
43         userList.put(user.getUserName(), user);
44         return "redirect:/user/userlist";
45     }
46     
47     
48 
49 
50 
51 
52 3.处理文件上传-多文件上传
53 
54     //添加用户时，为post请求，访问以下代码
55     @RequestMapping(value="/adduser",method=RequestMethod.POST)
56     public String add(@Validated User user,BindingResult bindingResult,@RequestParam("attachs") MultipartFile[] attachs,HttpServletRequest req){//紧跟validate之后写验证结果
57         if(bindingResult.hasErrors()){
58             //若有错误，直接掉转到add 视图
59             return "user/add";
60         }
61         
62         String realPath =  req.getSession().getServletContext().getRealPath("/resources/upload");
63         System.out.println(realPath);
64         //循环
65         for(MultipartFile attach:attachs){
66             if(!attach.isEmpty()){//判断文件是否为空
67                 File file = new File(realPath+"/"+attach.getOriginalFilename());
68                 try {
69                     //FileUtils.copyInputStreamToFile(attach.getInputStream(), file);
70                     //FileUtils.writeByteArrayToFile(file, attach.getBytes());
71                     attach.transferTo(file);
72                 } catch (Exception e) {
73                     // TODO Auto-generated catch block
74                     e.printStackTrace();
75                 }
76             }
77         }
78         userList.put(user.getUserName(), user);
79         return "redirect:/user/userlist";
80     }
81 
82 
83 
84 
85 
86 4.在add.jsp中的form表单中添加，如果是多文件上传就按照需求添加
87     <!--单文件上传文件-->
88     Attach:<input type="file" name="attach"/>
89 
90         <!--多文件上传文件，注意：attachs-->
91             Attach1:<input type="file" name="attachs"/><br/>
92         Attach2:<input type="file" name="attachs"/><br/>
93         Attach3:<input type="file" name="attachs"/><br/>
94         Attach4:<input type="file" name="attachs"/><br/>