springMVC實現多文件上傳的方式有兩種，一種是我們經常使用的以字節流的方式進行文件上傳，另外一種是使用springMVC包裝好的解析器進行上傳。這兩種方式對於實現多文件上傳效率上卻有著很大的差距，下面我們通過實例來看一下這兩種方式的實現方式，同時比較一下在效率上到底存在著多大的差距。
1.下載相關jar包。需要引入的jar出了springMVC的jar包外，還需要引入com.springsource.org.apache.commons.fileupload-1.2.0.jar和com.springsource.org.apache.commons.io-1.4.0.jar。
2.配置springAnnotation-servlet.xml文件（文件名稱可以自定義，只要和web.xml中引入的名稱一樣即可）：
<?xml version="1.0" encoding="UTF-8"?> <!-- Bean頭部--> <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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" 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 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> <!-- 註解掃描包--> <context:component-scan base-package="com.tgb.web.controller.annotation"></context:component-scan> <!-- 代替下面的兩行代碼--> <mvc:annotation-driven/> <!-- 靜態資源訪問--> <mvc:resources location="/img/" mapping="/img/**"/> <mvc:resources location="/js/" mapping="/js/**"/> <bean id="viewResolver"> <property name="prefix" value="/"></property> <property name="suffix" value=".jsp"></property> </bean> <bean id="multipartResolver"> <property name="defaultEncoding" value="utf-8"></property> <property name="maxUploadSize" value="10485760000"></property> <property name="maxInMemorySize" value="40960"></property> </bean> </beans>
3. 配置web.xml文件：
<?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"> <display-name>springMVC1</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> <servlet> <servlet-name>springMVC</servlet-name> <!-- springMVC的分發器--> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:config/springAnnotation-servlet.xml</param-value> </init-param> <!-- 表示當Tomcat已啟動的時候初始化這個Servlet --> <load-on-startup>1</load-on-startup> </servlet> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> <!--設置你想用的字符集，我這裡用的是GB18030--> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> <!--設置你想過濾的頁面或者是Servlet，根據自己的需要配置--> </filter-mapping> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
4. jsp頁面代碼：
<%@ 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> <script type="text/javascript" src="../js/jquery-1.7.2.js"></script> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript"> i = 1; j = 1; $(document).ready(function(){ $("#btn_add1").click(function(){ document.getElementById("newUpload1").innerHTML+='<div id="div_'+i+'"><input name="file" type="file" /><input type="button" value="刪除" onclick="del_1('+i+')"/></div>'; i = i + 1; }); $("#btn_add2").click(function(){ document.getElementById("newUpload2").innerHTML+='<div id="div_'+j+'"><input name="file_'+j+'" type="file" /><input type="button" value="刪除" onclick="del_2('+j+')"/></div>'; j = j + 1; }); }); function del_1(o){ document.getElementById("newUpload1").removeChild(document.getElementById("div_"+o)); } function del_2(o){ document.getElementById("newUpload2").removeChild(document.getElementById("div_"+o)); } </script> </head> <body> <h1>springMVC字節流輸入上傳文件</h1> <form name="userForm1" action="/springMVC7/file/upload" enctype="multipart/form-data" method="post"> <div id="newUpload1"> <input type="file" name="file"> </div> <input type="button" id="btn_add1" value="增加一行" > <input type="submit" value="上傳" > </form> <br> <br> <hr align="left" color="#FF0000" size="3"> <br> <br> <h1>springMVC包裝類上傳文件</h1> <form name="userForm2" action="/springMVC7/file/upload2" enctype="multipart/form-data" method="post""> <div id="newUpload2"> <input type="file" name="file"> </div> <input type="button" id="btn_add2" value="增加一行" > <input type="submit" value="上傳" > </form> </body> </html>5.實現上傳功能的java bean：
package com.tgb.web.controller.annotation.upload; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.net.URLDecoder; import java.util.Date; import java.util.Iterator; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.swing.filechooser.FileNameExtensionFilter; 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.CommonsMultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartResolver; import org.springframework.web.servlet.ModelAndView; import com.tgb.web.controller.entity.User; @Controller @RequestMapping("/file") public class UploadController { @RequestMapping("/upload" ) public String addUser(@RequestParam("file") CommonsMultipartFile[] files,HttpServletRequest request){ for(int i = 0;i<files.length;i++){ System.out.println("fileName---------->" + files[i].getOriginalFilename()); if(!files[i].isEmpty()){ int pre = (int) System.currentTimeMillis(); try { //拿到輸出流，同時重命名上傳的文件FileOutputStream os = new FileOutputStream("H:/" + new Date().getTime() + files[i].getOriginalFilename()); //拿到上傳文件的輸入流FileInputStream in = (FileInputStream) files[i].getInputStream(); //以寫字節的方式寫文件int b = 0; while((b=in.read()) != -1){ os.write(b); } os.flush(); os.close(); in.close(); int finaltime = (int) System.currentTimeMillis(); System.out.println(finaltime - pre); } catch (Exception e) { e.printStackTrace(); System.out.println("上傳出錯"); } } } return "/success"; } @RequestMapping("/upload2" ) public String upload2(HttpServletRequest request,HttpServletResponse response) throws IllegalStateException, IOException { //創建一個通用的多部分解析器CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); //判斷request 是否有文件上傳,即多部分請求if(multipartResolver.isMultipart(request)){ //轉換成多部分request MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request; //取得request中的所有文件名Iterator<String> iter = multiRequest.getFileNames(); while(iter.hasNext()){ //記錄上傳過程起始時的時間，用來計算上傳時間int pre = (int) System.currentTimeMillis(); //取得上傳文件MultipartFile file = multiRequest.getFile(iter.next()); if(file != null){ //取得當前上傳文件的文件名稱String myFileName = file.getOriginalFilename(); //如果名稱不為“”,說明該文件存在，否則說明該文件不存在if(myFileName.trim() !=""){ System.out.println(myFileName); //重命名上傳後的文件名String fileName = "demoUpload" + file.getOriginalFilename(); //定義上傳路徑String path = "H:/" + fileName; File localFile = new File(path); file.transferTo(localFile); } } //記錄上傳該文件後的時間int finaltime = (int) System.currentTimeMillis(); System.out.println(finaltime - pre); } } return "/success"; } @RequestMapping("/toUpload" ) public String toUpload() { return "/upload"; } } 6.最後看後台打印數據，數據來源於後台打印的上傳文件所用的時間，第一幅圖片是使用字節流寫入方式完成三個文件上傳中每個文件用時，第二幅圖片是使用springMVC包裝好的解析器進行的三個相同的文件上傳中每個文件的用時：
字節流實現文件上傳的傳遞效率，結果顯示傳遞三個文件用時分別為534ms，453ms和387ms。
使用springMVC解析器進行文件上傳用時分別為2ms，1ms和2ms。
通過對比這兩種方式我們可以發現使用springMVC進行多文件的效率顯然要比字符流寫入方式效率上要高得多。
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