SpringMVC处理上传文件

Spring MVC处理文件上传
Spring MVC为文件上传提供了直接支持,这种支持是通过即插即用的MultipartResolver实现. Spring使用Jakarta Commons FileUpload技术实现了一个MultipartResolver实现类:CommonsMultipartResolver。

在SpringMVC上下文中默认没有装配MultipartResolver,因此默认情况下不能处理文件上传工作。如果想使用Spring的文件上传功能,则需要先在上下文中配置MultipartResolver。

引入jar包!

commons-fileupload.jar
 
commons-io.jar

maven项目pom.xml

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<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>
配置MultipartResolver

配置

<!--multipartResolver配置 id必须为multipartResolver-->
<bean id="multipartResolver"
      class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
      p:defaultEncoding="UTF-8"
      p:maxUploadSize="5242880"
      p:uploadTempDir="file:/d:/file/temp"
/>

编写控制器和文件上传表单
编写文件上传表单 upload.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
  <center>
      <form method="post" enctype="multipart/form-data" action="user/upload">
           上传图片：
            <input type="file" name="file" />
            <button>提交</button>
      </form>
  </center>
</body>
</html>

编写控制器代码

1. @RequestMapping("/toUpload")  public String toUpload(){
       //跳转到上传页面
       return  "user/upload";  }
    
    @RequestMapping("/upload")  public  String
   saveFile(@RequestParam("file")MultipartFile file) throws IOException
   {
       //接收表单提交的数据,包含文件
       System.out.println("name = " + name);   
         
        // baseurl=D:\workspace_idea1\TestSSM\target\TestSSM\upload\
          String basePath=request.getSession().getServletContext().getRealPath("/upload/");
    
    
           System.out.println(basePath);
    
           try {
               file.transferTo(new File(basePath+file.getOriginalFilename()));
           } catch (IOException e) {
               e.printStackTrace();
           }
            return "success";  }