使用springMVC实现文件上传和下载之环境配置与上传

一、
基础配置：

maven导包及配置pom.xml，导包时除开springmvc的基础依赖外，需要导入文件上传下载时用到的commons-io.jsr和commons-fileupload.jar：

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>filLoadTest</groupId>

<artifactId>filLoadTest</artifactId>

<packaging>war</packaging>

<version>0.0.1-SNAPSHOT</version>

<name>filLoadTest Maven Webapp</name>

<url>http://maven.apache.org</url>

<build>

<finalName>filLoadTest</finalName>

<plugins>

<!-- 以下配置可以保证每次强制更新时jre版本不会变化，那我的eclipse4.4.1，maven3.2.5为例，如果不设置这个，每次强制更新时jre就会变回1.5 -->

<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<version>2.3.2</version>

<configuration>

<source>1.7</source>

<target>1.7</target>

<encoding>UTF-8</encoding>

<compilerArguments>

<verbose />

<bootclasspath>${java.home}\lib\rt.jar</bootclasspath>

</compilerArguments>

</configuration>

</plugin>

</plugins>

</build>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>3.8.1</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-webmvc</artifactId>

<version>4.0.6.RELEASE</version>

</dependency>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-annotations</artifactId>

<version>2.2.3</version>

</dependency>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-core</artifactId>

<version>2.2.3</version>

</dependency>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-databind</artifactId>

<version>2.2.3</version>

</dependency>

<dependency>

<groupId>commons-fileupload</groupId>

<artifactId>commons-fileupload</artifactId>

<version>1.3.1</version>

</dependency>

<dependency>

<groupId>commons-io</groupId>

<artifactId>commons-io</artifactId>

<version>2.4</version>

</dependency>

</dependencies>

</project>

web.xml基础配置：

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<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

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">

<filter>

<description>字符集过滤器</description>

<filter-name>encodingFilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<description>字符集编码</description>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<servlet>

<servlet-name>springMVC</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:spring.xml</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>springMVC</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

</web-app>

spring基础配置spring.xml:

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<?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.xsd">
<context:annotation-config />

<mvc:annotation-driven />

<context:component-scan base-package="controllers" />

<!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->

<bean id="mappingJacksonHttpMessageConverter"

class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">

<property name="supportedMediaTypes">

<list>

<value>text/html;charset=utf-8</value>

</list>

</property>

</bean>

<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->

<bean

class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

<property name="messageConverters">

<list>

<ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->

</list>

</property>

</bean>

<!-- 支持上传文件 -->

<bean id="multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver" >

<!-- 100M -->

<property name="maxUploadSize" value="104857600"></property>

<property name="defaultEncoding" value="utf-8"></property>

</bean>

</beans>

二、文件上传的代码

上传的简单页面index.html,要注意form表单提交时的entype的设置：

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<!DOCTYPE html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

</head>

<body>

<form action="./upLoadFile.do" method="post" enctype="multipart/form-data">

选择文件：<input type="file" name="file"/>

<input type="submit" value="提交"/>

</form>

</body>

</html>

上传对应的后台java代码，具体问题见注释：

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package controllers;

import java.io.File;

import java.io.IOException;

import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.MediaType;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.MultipartHttpServletRequest;

import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Controller

public class fileController {

/**

* 文件上传

*

* @author：tuzongxun

* @Title: upLoadFile

* @param @param file

* @param @param request

* @param @throws IllegalStateException

* @param @throws IOException

* @return void

* @date Apr 28, 2016 1:22:00 PM

* @throws

*/

@RequestMapping(value = "/upLoadFile.do", method = RequestMethod.POST)

public void upLoadFile(HttpServletRequest request)

throws IllegalStateException, IOException {

// @RequestParam("file") MultipartFile file,

CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(

request.getSession().getServletContext());

// 判断 request 是否有文件上传,即多部分请求

if (multipartResolver.isMultipart(request)) {

// 转换成多部分request

MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;

// 取得request中的所有文件名

Iterator<String> iter = multiRequest.getFileNames();

while (iter.hasNext()) {

// 取得上传文件

MultipartFile f = multiRequest.getFile(iter.next());

if (f != null) {

// 取得当前上传文件的文件名称

String myFileName = f.getOriginalFilename();

// 如果名称不为“”,说明该文件存在，否则说明该文件不存在

if (myFileName.trim() != "") {

// 定义上传路径

String path = "C:\\Users\\tuzongxun123\\Desktop\\"

+ myFileName;

File localFile = new File(path);

f.transferTo(localFile);

}

}

}

}

}

}

页面效果图如下，当选择文件提交后，便会看到选中的文件被传到了代码中指定的位置，这里是我的桌面上。