spring mvc利用MultipartResolver解析Multipart/form-data进行文件上传

本文转载自查看原文 2014-05-03 16:35 4807 spring

之前的表单数据都是文本数据，现记录：利用MultipartResolver进行文件上传。

①首先，需引入commons-fileUpload和commons-io jar包，pom.xml文件的坐标：

< properties >
       < spring.version >3.2.1.RELEASE </ spring.version >
   </ properties >
   < dependencies >
           < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-webmvc </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-web </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-context </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-core </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-beans </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-aop </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-tx </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-jdbc </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-test </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >
             < dependency >
                 < groupId >org.springframework </ groupId >
                 < artifactId >spring-context-support </ artifactId >
                 < version >${spring.version} </ version >
             </ dependency >

           < dependency >
             < groupId >log4j </ groupId >
             < artifactId >log4j </ artifactId >
             < version >1.2.16 </ version >
         </ dependency >
         < dependency >
             < groupId >junit </ groupId >
             < artifactId >junit </ artifactId >
             < version >4.8.2 </ version >
         </ dependency >
         < dependency >
                 < groupId >org.apache.velocity </ groupId >
                 < artifactId >velocity </ artifactId >
                 < version >1.7 </ version >
             </ dependency >
             < dependency >
                 < groupId >org.apache.velocity </ groupId >
                 < artifactId >velocity-tools </ artifactId >
                 < version >2.0 </ version >
                 < exclusions >
                     < exclusion >
                         < groupId >org.apache.struts </ groupId >
                         < artifactId >struts-core </ artifactId >
                     </ exclusion >
                     < exclusion >
                         < groupId >org.apache.struts </ groupId >
                         < artifactId >struts-taglib </ artifactId >
                     </ exclusion >
                     < exclusion >
                         < groupId >org.apache.struts </ groupId >
                         < artifactId >struts-tiles </ artifactId >
                     </ exclusion >
                     < exclusion >
                         < groupId >sslext </ groupId >
                         < artifactId >sslext </ artifactId >
                     </ exclusion >
                 </ exclusions >
             </ dependency >

             < dependency >
                 < groupId >servletapi </ groupId >
                 < artifactId >servlet-api </ artifactId >
                 < version >2.4 </ version >
                 < optional >true </ optional >
             </ dependency >
             < dependency >
                 < groupId >javax.servlet </ groupId >
                 < artifactId >jstl </ artifactId >
                 < version >1.2 </ version >
             </ dependency >
             < dependency >
                 < groupId >jspapi </ groupId >
                 < artifactId >jsp-api </ artifactId >
                 < version >2.0 </ version >
                 < optional >true </ optional >
             </ dependency >

             
             < dependency >
                 < groupId >org.hibernate </ groupId >
                 < artifactId >hibernate-validator </ artifactId >
                 < version >4.2.0.Final </ version >
                 
             </ dependency >
             < dependency >
                 < groupId >commons-fileupload </ groupId >
                 < artifactId >commons-fileupload </ artifactId >
                 < version >1.3.1 </ version >
             </ dependency >
             < dependency >
                 < groupId >commons-io </ groupId >
                 < artifactId >commons-io </ artifactId >
                 < version >2.2 </ version >
             </ dependency >
   </ dependencies >

View Code

② 修改表单页面：

< form method ="post" enctype ="multipart/form-data" >
     < div >
         < label for ="userName" >userName: </ label >
         < input name ="userName" value ="$!user.userName" >
         < span >$!br.getFieldError("userName").getDefaultMessage() </ span >
     </ div >

     < div >
         < label for ="email" >Email: </ label >
         < input name ="email" value ="$!user.email" >
     </ div >

     < div >
         < label for ="age" >age: </ label >
         < input name ="age" value ="$!user.age" >
     </ div >

     < div >
         < label for ="image" >image: </ label >
         < input type ="file" name ="image" >
     </ div >
     < button type ="submit" >Submit </ button >
</ form >

View Code

③ 处理multipart 表单的方法：

     // 处理表单输入
    @RequestMapping(method=RequestMethod.POST)
     // @Valid是对user参数的验证
     public String addForm(@Valid User user,BindingResult br,@RequestParam(value="image",required= false)MultipartFile image,Model model){
         if(br.hasErrors()){
            model.addAttribute("br",br);
             return "/user/edit";
        }
        LOG.info("Image:"+image.getName()+"  Image Size:"+image.getSize());
//         saveImage();
        userService.saveUser(user);
         return "redirect:/home/"+user.getUserName();
    }

注意到输入参数增加了@RequestParam(value="image",required=false)MultipartFile image，这是将上传的图片文件赋给MultipartFile。但DispatcherServlet并不知道如何处理multipart的表单数据，需要一个multipart解析器将post请求的数据抽取处理，然后再将数据通过DispatcherServlet传递给Controller。

③ spring提供了一个Multipart解析器，需要在spring上下文中注册：

< bean id ="multipartResolver" class ="org.springframework.web.multipart.commons.CommonsMultipartResolver" >
         < property name ="maxUploadSize" value ="100000" ></ property >
     </ bean >

这个bean的id是有讲究的，当DispatcherServlet查找multipart解析器时，会查找id为multipartResolver的Bean。若定义的bean id 不是multipartResolver，DispatcherServlet会对它进行忽略。

可以画成下图进行理解：

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