文件上传

文件上传Maven依赖文件上传jar包

   <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

表单增加user上传头像，form表单需要增加enctype="multipart/form-data",其中“/file”为idea的虚拟文件映射

　　　　　<tr>
            <td>个人头像</td>
            <td>
                <c:if test="${user.portal !=null }">
                    <img src="/file/${user.portal}" width="100" height="100"/>
                </c:if>
                <input type="file" name="user_portal"/>
            </td>
        </tr>

多部件文件解析

 <!--多部件类型解析-->
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
          <property name="maxUploadSize" value="5242880"/>   //最大5M
          <property name="defaultEncoding" value="utf-8"/>
     </bean>

Controller处理

 @RequestMapping(value="/showUser",method= RequestMethod.POST)
    public ModelAndView showUser(@Valid  User user, BindingResult bindingResult, MultipartFile user_portal) throws IOException {  
    //user_portal要和前台的name保持一致

        String filename = user_portal.getOriginalFilename();
        if(user_portal!=null && filename!=null && filename.length()>0){
            String path="D:\\spring_project\\chapter17\\pic_repo\\";
            String newName=UUID.randomUUID()+filename.substring(filename.lastIndexOf("."));
            File newFile = new File(path + newName);
            if(!newFile.exists())
                newFile.mkdirs();
            user_portal.transferTo(newFile);
            user.setPortal(newName);
        }

 

参考：

https://blog.csdn.net/eson_15/article/details/51742864