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";
}
}