springMVC兩種方式實現多文件上傳及效率比較

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。這兩種方式對于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。所有的jar包可以通過“點擊這里”進行下載。

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）：

[html]?view plaincopy  
 <?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">??
 ?????
 ???<!--?注解掃描包?-->??
 ???<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"?class="org.springframework.web.servlet.view.InternalResourceViewResolver">??
 ????????<property?name="prefix"?value="/"></property>??
 ????????<property?name="suffix"?value=".jsp"></property>??
 ??????
 ???</bean>??
 ?????
 ???<bean?id="multipartResolver"?class="org.springframework.web.multipart.commons.CommonsMultipartResolver">??
 ????????<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：

[html]?view plaincopy  
 <?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，我這里用的是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：

[html]?view plaincopy  
 <%@?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"?width="60%"?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：

[java]?view plaincopy  
 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);??
 ????????????????????????//重命名上傳后的文件名??
 ????????????????????????String?fileName?=?"demoUpload"?+?file.getOriginalFilename();??
 ????????????????????????//定義上傳路徑??
 ????????????????????????String?path?=?"H:/"?+?fileName;??
 ????????????????????????File?localFile?=?new?File(path);??
 ????????????????????????file.transferTo(localFile);??
 ????????????????????}??
 ????????????????}??
 ????????????????//記錄上傳該文件后的時間??
 ????????????????int?finaltime?=?(int)?System.currentTimeMillis();??
 ????????????????System.out.println(finaltime?-?pre);??
 ????????????}??
 ??????????????
 ????????}??
 ????????return?"/success";??
 ????}??
 ??????
 ????@RequestMapping("/toUpload"?)???
 ????public?String?toUpload()?{??
 ??????????
 ????????return?"/upload";??
 ????}??
 ??????
 }??