springMVC实现多文件上传的方式有两种,一种是我们经常使用的以字节流的方式进行文件上传,另外一种是使用springMVC包装好的解析器进行上传。这两种方式对于实现多文件上传效率上却有着很大的差距,下面我们通过实例来看一下这两种方式的实现方式,同时比较一下在效率上到底存在着多大的差距。
1.下载相关jar包。需要引入的jar出了springMVC的jar包外,还需要引入com.springsource.org.apache.commons.fileupload-1.2.0.jar和com.springsource.org.apache.commons.io-1.4.0.jar。所有的jar包可以通过“点击这里”进行下载。
2.配置springAnnotation-servlet.xml文件(文件名称可以自定义,只要和web.xml中引入的名称一样即可):
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:p="http://www.springframework.org/schema/p"
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xmlns:mvc="http://www.springframework.org/schema/mvc"
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xmlns:context="http://www.springframework.org/schema/context"
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xmlns:util="http://www.springframework.org/schema/util"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
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http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
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http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
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<context:component-scan base-package="com.tgb.web.controller.annotation"></context:component-scan>
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<mvc:annotation-driven/>
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<mvc:resources location="/img/" mapping="/img/**"/>
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<mvc:resources location="/js/" mapping="/js/**"/>
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<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
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<property name="prefix" value="/"></property>
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<property name="suffix" value=".jsp"></property>
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</bean>
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<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
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<property name="defaultEncoding" value="utf-8"></property>
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<property name="maxUploadSize" value="10485760000"></property>
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<property name="maxInMemorySize" value="40960"></property>
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</bean>
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</beans>
3. 配置web.xml文件:
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<?xml version="1.0" encoding="UTF-8"?>
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<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">
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<display-name>springMVC1</display-name>
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<welcome-file-list>
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<welcome-file>index.html</welcome-file>
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</welcome-file-list>
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<servlet>
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<servlet-name>springMVC</servlet-name>
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<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
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<init-param>
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<param-name>contextConfigLocation</param-name>
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<param-value>classpath*:config/springAnnotation-servlet.xml</param-value>
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</init-param>
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<load-on-startup>1</load-on-startup>
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</servlet>
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<filter>
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<filter-name>encodingFilter</filter-name>
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<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
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<init-param>
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<param-name>encoding</param-name>
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<param-value>UTF-8</param-value>
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</init-param>
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<init-param>
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<param-name>forceEncoding</param-name>
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<param-value>true</param-value>
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</init-param>
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</filter>
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<filter-mapping>
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<filter-name>encodingFilter</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
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<servlet-mapping>
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<servlet-name>springMVC</servlet-name>
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<url-pattern>/</url-pattern>
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</servlet-mapping>
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</web-app>
4. jsp页面代码:
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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<script type="text/javascript" src="../js/jquery-1.7.2.js"></script>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Insert title here</title>
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<script type="text/javascript">
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i = 1;
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j = 1;
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$(document).ready(function(){
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$("#btn_add1").click(function(){
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document.getElementById("newUpload1").innerHTML+=‘<div id="div_‘+i+‘"><input name="file" type="file" /><input type="button" value="删除" onclick="del_1(‘+i+‘)"/></div>‘;
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i = i + 1;
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});
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$("#btn_add2").click(function(){
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document.getElementById("newUpload2").innerHTML+=‘<div id="div_‘+j+‘"><input name="file_‘+j+‘" type="file" /><input type="button" value="删除" onclick="del_2(‘+j+‘)"/></div>‘;
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j = j + 1;
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});
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});
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function del_1(o){
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document.getElementById("newUpload1").removeChild(document.getElementById("div_"+o));
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}
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function del_2(o){
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document.getElementById("newUpload2").removeChild(document.getElementById("div_"+o));
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}
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</script>
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</head>
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<body>
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<h1>springMVC字节流输入上传文件</h1>
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<form name="userForm1" action="/springMVC7/file/upload" enctype="multipart/form-data" method="post">
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<div id="newUpload1">
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<input type="file" name="file">
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</div>
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<input type="button" id="btn_add1" value="增加一行" >
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<input type="submit" value="上传" >
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</form>
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<br>
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<br>
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<hr align="left" width="60%" color="#FF0000" size="3">
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<br>
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<br>
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<h1>springMVC包装类上传文件</h1>
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<form name="userForm2" action="/springMVC7/file/upload2" enctype="multipart/form-data" method="post"">
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<div id="newUpload2">
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<input type="file" name="file">
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</div>
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<input type="button" id="btn_add2" value="增加一行" >
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<input type="submit" value="上传" >
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</form>
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</body>
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</html>
5.实现上传功能的java bean:
6.最后看后台打印数据,数据来源于后台打印的上传文件所用的时间,第一幅图片是使用字节流写入方式完成三个文件上传中每个文件用时,第二幅图片是使用springMVC包装好的解析器进行的三个相同的文件上传中每个文件的用时:
字节流实现文件上传的传递效率,结果显示传递三个文件用时分别为534ms,453ms和387ms。

使用springMVC解析器进行文件上传用时分别为2ms,1ms和2ms。

通过对比这两种方式我们可以发现使用springMVC进行多文件的效率显然要比字符流写入方式效率上要高得多
springMVC两种实现多文件上传及效率比较
原文:http://blog.csdn.net/a_dreaming_fish/article/details/51119667