1 概述
- SpringMVC为文件上传提供了直接的支持，这种支持是通过即插即用的MultipartResolver实现的。Spring用Jakarta Commons Fileupload技术实现一个MultipartResolver实现类：CommonsMultipartResover。
- SpringMVC上下文中默认没有装配MultipartResovler，因此默认情况下不能处理文件的上传工作，如果想要使用Spring的文件上传功能，需要在上下文中配置MultipartResolver。
2 入门示例
2.1 导入FileUpload对应的jar包的maven坐标
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.2</version>
</dependency>2.2 在SpringMVC中配置CommonsMultipartResolver
<!-- 配置CommonsMultipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"/>
<property name="maxUploadSize" value="5242880"/>
</bean>2.3 应用示例
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">
姓名:<input type="text" name="username" value=""/><br/>
上传文件:<input type="file" name="file"/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>package com.sunxiaping.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
@Controller
public class UserController {
@RequestMapping(value = "/upload")
public String upload(String username, MultipartFile file, HttpServletRequest request) throws IOException {
System.out.println("username:" + username);
System.out.println("file:" + file);
String originalFilename = file.getOriginalFilename();
System.out.println("文件原来的名称:" + originalFilename);
String path = request.getRealPath("/upload/" + originalFilename);
File destfile = new File(path);
if (destfile.exists()) {
destfile.getParentFile().mkdirs();
}
file.transferTo(destfile);
return "success";
}
}<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd ">
<!-- 配置自动扫描的包 -->
<context:component-scan base-package="com.sunxiaping.springmvc"></context:component-scan>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 配置CommonsMultipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"/>
<property name="maxUploadSize" value="5242880"/>
</bean>
<mvc:annotation-driven ></mvc:annotation-driven>
</beans><%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
成功啦 <br/>
</body>
</html>
