springmvc文件上传 | 文件上传

添加文件上传相关依赖

<dependency>
　　<groupId>commons-fileupload</groupId>
　　<artifactId>commons-fileupload</artifactId>
　　<version>1.3.3</version>
</dependency>

配置文件上传解析器(CommonsMultipartResolver)

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 文件最大大小(字节) 1024*1024*50=50M-->
<property name="maxUploadSize" value="52428800"></property>
<!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常-->
<property name="resolveLazily" value="true"/>
</bean>

然后新建一个jsp页面

表单提交方式为method="post" enctype="multipart/form-data"

<%--
  Created by IntelliJ IDEA.
  User: Admin
  Date: 2019/10/30
  Time: 11:04
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>讲解springmvc文件上传</title>
</head>
<body>
<form action="/book/upload" method="post" enctype="multipart/form-data">
    请选择文件：<input type="file" name="huang"/>
    <input type="submit" value="ok">
</form>
</body>
</html>

再写一个方法测试

 @RequestMapping("/upload")
    public String upload(HttpServletRequest req ,MultipartFile huang){
        String fileName=huang.getOriginalFilename();
        String contentType= huang.getContentType();
        try {
            FileUtils.copyInputStreamToFile(huang.getInputStream(),new File("G:/workspace/IdeaProjects/"+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "redirect:/book/list;
    }