Spring MVC框架：第九章：文件上传

第七章文件上传
1.表单

<form action="..." method="post" enctype="multipart/form-data">
    <input type="file" .../>
</form>

2.jar包

commons-fileupload-1.3.jar和commons-io-2.0.1.jar
3.配置CommonsMultipartResolver

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- 避免中文乱码 -->
    <property name="defaultEncoding" value="UTF-8"/>
</bean>

注意：id必须是multipartResolver
4.接收数据

①普通数据：和以前一样正常接收 ②文件数据：使用@RequestParam注解注入到MultipartFile类型的入参中

@RequestMapping("/upload")
public String upload(@RequestParam("picture") MultipartFile picture) {
    return "...";
}

③MultiPartFile类型

在这里插入图片描述
实战案例：
结构图

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
	<servlet>
		<servlet-name>springDispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring-mvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<!-- Map all requests to the DispatcherServlet for handling -->
	<servlet-mapping>
		<servlet-name>springDispatcherServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

spring-mvc.xml

<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
	<context:component-scan base-package="com.handlers"/>
	
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/page/"/>
		<property name="suffix" value=".jsp"/>
	</bean>
	
	<mvc:annotation-driven/>
	<mvc:default-servlet-handler/>
	
	<!-- 配置multipart/form-data类型数据的解析器bean -->
	<!-- bean的id必须是：multipartResolver -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="UTF-8"/>
	</bean>

</beans>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>Insert title here</title>
	</head>
	<body>
		<form action="${pageContext.request.contextPath }/upload" method="post" enctype="multipart/form-data">
				你看我的新头像牛逼吗？
				<input type="file" name="picture" /><br/>
				<input type="submit" value="上传"/>
		</form>
	</body>
</html>

target.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>Target</h1>
	<img src="${pageContext.request.contextPath }/myUpload/${requestScope.pictureName}"/>
</body>
</html>

UploadHandled.java

package com.handlers;

import java.io.File;
import javax.servlet.ServletContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadHandled {

	@Autowired
	private ServletContext servletContext;
	
	@RequestMapping("/upload")
	public String updoal(@RequestParam("picture") MultipartFile picture,Model model ) throws Exception, Exception {
			System.out.println(picture.getContentType());
			String originalFilename = picture.getOriginalFilename();
			String realPath = servletContext.getRealPath("/myUpload");
			picture.transferTo(new File(realPath+"/"+originalFilename));
			model.addAttribute("pictureName", originalFilename);
		return "target";
	}
}