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
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"; } }
