spring之spring mvc下 文件上传

1.引入spring mvc环境,配置依赖.

pom.xml :

<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.9</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>3.2.1.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>3.2.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>3.2.1.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.4</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.1</version>
			<scope>provided</scope>
		</dependency>


		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
	</dependencies>      

  2.配置web.xml.

<web-app>
	<display-name>Archetype Created Web Application</display-name>

	<servlet>
		<servlet-name>spring_mvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:applicationContext.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>spring_mvc</servlet-name>
		<url-pattern>/spring/*</url-pattern>
	</servlet-mapping>
</web-app>      

3.配置applicationContext.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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
	http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
	">

	<!-- 开启注解扫描 -->
	<context:component-scan base-package="com.zt.*"></context:component-scan>
	<!--开启 注解解析,和下面的是一样的-->
	<mvc:annotation-driven/>
	
	<!--解析方法上的requestMapping注解 
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean>
	 解析controller上面的@requestMapping注解 
	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean>
	-->
	
	
	<!-- 上传文件解析器配置 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!--用来解析request请求的默认编码格式  -->
		<property name="defaultEncoding" value="utf-8"/>
		<!-- 设置上传文件时允许写到内存中的最大值,以字节为单位,默认10240 -->
		<property name="maxInMemorySize" value="40960"/>
		<!-- 设置允许上传的最大文件大小,以字节为单位 ,-1表示无限制,默认为-1.-->
		<property name="maxUploadSize" value="10485760000"/>
	</bean>
	
	<!-- 返回视图解析器配置 -->
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
</beans>      

4.编写controller.

@Controller
@RequestMapping("/file")
public class UploadController {

	//用流
	@RequestMapping("/upload")
	public String upload(
			@RequestParam("file") CommonsMultipartFile commonsMultipartFile,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		System.out.println("fileName--->"
				+ commonsMultipartFile.getOriginalFilename());
		if (!commonsMultipartFile.isEmpty()) {
			// 输出流
			FileOutputStream os = new FileOutputStream(new File("D:/"
					+ new Date().getTime()
					+ commonsMultipartFile.getOriginalFilename()));
			// 输入流
			InputStream is = commonsMultipartFile.getInputStream();

			byte[] b = new byte[1024];
			int len = 0;
			while ((len = is.read(b)) != -1) {
				os.write(b, 0, len);
			}
			// 刷新,关闭流
			os.flush();
			os.close();
			is.close();
		}

		return "/success";
	}

	//用spring封装类
	@RequestMapping("/upload2")
	public String upload2(HttpServletRequest request,
			HttpServletResponse response) {
		// 定义解析器
		CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
				request.getSession().getServletContext());
		if (multipartResolver.isMultipart(request)) {
			MultipartHttpServletRequest muRequest = (MultipartHttpServletRequest) request;
			Iterator<String> iterator = muRequest.getFileNames();
			while (iterator.hasNext()) {
				MultipartFile file = muRequest.getFile(iterator.next());
				if (file != null) {
					String fileName = file.getOriginalFilename();
					String path = "D:/" + fileName;
					File localFile = new File(path);
					try {
						// 写入
						file.transferTo(localFile);
					} catch (Exception e) {
						throw new RuntimeException(e);
					}
				}
			}
		}
		return "/success";
	}
}
           

5.测试页面jsp

           upload.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>文件上传</title>
</head>
<body>
	<div>文件上传</div>
	<form name="userForm" action="spring/file/upload2" method="post"
		enctype="multipart/form-data">
		选择文件:<input type="file" name="file"> <input type="submit"
			value="上传">
	</form>
</body>
</html>
           

success.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>上传成功</title>
</head>
<body>上传成功!
</body>
</html>