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使用springMVC实现文件上传和下载之环境配置与上传

时间:2016-04-29 15:32:50      阅读:180      评论:0      收藏:0      [点我收藏+]

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最近的项目中用到了文件的上传和下载功能,任务分配给了其他的同时完成。如今项目结束告一段落,我觉着这个功能比较重要,因此特意把它提取出来自己进行了尝试。


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:
<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:
<?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:
<?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:
<!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:
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。

技术分享

使用springMVC实现文件上传和下载之环境配置与上传

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原文地址:http://blog.csdn.net/tuzongxun/article/details/51276554

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