本文将使用   apache fileupload   ,spring MVC   jquery 实现一个带进度条的多文件上传， 由于fileupload 的局限，暂不能实现每个上传文件都显示进度条，只能实现一个总的进度条

优点:不用引入第三方的组件(如js框架,flash等)

缺点:如果同时上传多个文件,由于apache fileupload API的限制,只能显示一个总的进度条

1.引入环境所需要的jar包

引入上传工具类jar包

  1. <dependency>
  2.     <groupId>commons-io</groupId>
  3.     <artifactId>commons-io</artifactId>
  4.     <version>2.4</version>
  5. </dependency>
  6. <dependency>
  7.     <groupId>commons-fileupload</groupId>
  8.     <artifactId>commons-fileupload</artifactId>
  9.     <version>1.3.1</version>
  10. </dependency>

引入mvc处理json数据jar包(@requestbody&@responsebody)

  1. <dependency>
  2.     <groupId>com.fasterxml.jackson.core</groupId>
  3.     <artifactId>jackson-core</artifactId>
  4.     <version>2.5.1</version>
  5. </dependency>
  6. <dependency>
  7.     <groupId>com.fasterxml.jackson.core</groupId>
  8.     <artifactId>jackson-databind</artifactId>
  9.     <version>2.5.1</version>
  10. </dependency>

2.jsp页面

  1. <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.     pageEncoding="UTF-8"%>
  3. <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
  4. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  5. <html>
  6. <head>
  7. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  8. <script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery.js"></script>
  9. <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
  10. <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
  11. <link rel="stylesheet" href="http://jqueryui.com/resources/demos/style.css">
  12. <script type="text/javascript">
  13. $(document).ready(function(){
  14.      $('#subbut').bind('click',
  15.             function(){
  16.                 $('#fForm').submit();  
  17.  
  18.                 var eventFun = function(){
  19.                     $.ajax({
  20.                         type: 'GET',
  21.                         url: '${pageContext.request.contextPath}/test/process.action',
  22.                         data: {},
  23.                         dataType: 'json',
  24.                         success : function(data){
  25.                                 $("#fff").html("上传进度:"+data.show);
  26.                                 $( "#proBar" ).progressbar({
  27.                                     value: data.rate
  28.                                   });
  29.                                 if(data.rate == 100){
  30.                                     window.clearInterval(intId);
  31.                                     alert("上传完成");
  32.                                 }
  33.                 }});};
  34.                 var intId = window.setInterval(eventFun,100);
  35.     });
  36. });
  37. </script>
  38. <title>Insert title here</title>
  39. </head>
  40. <body>
  41.       <form id='fForm'   action="${pageContext.request.contextPath}/test/testbar.action" encType="multipart/form-data"  method="post" target="uploadf">
  42.                          <div>
  43.                             <label>上传文件:</label>
  44.                             <div>
  45.                                 <input type="file"  name="file" style="width:550">
  46.                             </div>  
  47.  
  48.                             <label id="fff"></label>
  49.                             <div>
  50.                                 <div style="width:50%">
  51.                                     <div  id = 'proBar'></div>
  52.                                 </div>
  53.                             </div>
  54.                         </div>
  55.                          <div >
  56.                             <div >
  57.                             <button type="button" id="subbut" >submit</button>
  58.                             </div>
  59.                         </div>
  60.     </form>
  61.     <iframe name="uploadf" style="display:none"></iframe>
  62. </body>
  63. </html>

这里注意需要引入js和css,如果需要更换进度条的样式,可以引入其他的css(如bootstarp等)

3.后台的实现

  1. import java.io.File;
  2. import java.util.Iterator;
  3. import java.util.List;
  4. import javax.servlet.http.HttpServletRequest;
  5. import javax.servlet.http.HttpServletResponse;
  6. import javax.servlet.http.HttpSession;
  7. import org.apache.commons.fileupload.FileItem;
  8. import org.apache.commons.fileupload.FileItemFactory;
  9. import org.apache.commons.fileupload.ProgressListener;
  10. import org.apache.commons.fileupload.disk.DiskFileItemFactory;
  11. import org.apache.commons.fileupload.servlet.ServletFileUpload;
  12. import org.apache.log4j.Logger;
  13. import org.springframework.stereotype.Controller;
  14. import org.springframework.web.bind.annotation.RequestMapping;
  15. import org.springframework.web.bind.annotation.RequestMethod;
  16. import org.springframework.web.bind.annotation.ResponseBody;
  17. import org.springframework.web.servlet.ModelAndView;
  18. @Controller
  19. @RequestMapping("/test")
  20. public class FileUploadController {
  21.  
  22.     private final    Logger log = Logger.getLogger(FileUploadController.class);  
  23.  
  24.     /**
  25.      * upload  上传文件
  26.      */
  27.     @RequestMapping(value = "/testbar.action", method = RequestMethod.POST)
  28.     public ModelAndView upload(HttpServletRequest request,HttpServletResponse response) throws Exception {
  29.         final HttpSession hs = request.getSession();
  30.         ModelAndView mv = new ModelAndView();
  31.         boolean isMultipart = ServletFileUpload.isMultipartContent(request);
  32.         if(!isMultipart){
  33.             return mv;
  34.         }
  35.         // Create a factory for disk-based file items
  36.         FileItemFactory factory = new DiskFileItemFactory();  
  37.  
  38.         // Create a new file upload handler
  39.         ServletFileUpload upload = new ServletFileUpload(factory);
  40.         //解决上传文件名的中文乱码
  41.         upload.setHeaderEncoding("UTF-8"); 
  42.  
  43.         upload.setProgressListener(new ProgressListener(){
  44.                public void update(long pBytesRead, long pContentLength, int pItems) {
  45.                    ProcessInfo pri = new ProcessInfo();
  46.                    pri.itemNum = pItems;
  47.                    pri.readSize = pBytesRead;
  48.                    pri.totalSize = pContentLength;
  49.                    pri.show = pBytesRead+"/"+pContentLength+" byte";
  50.                    pri.rate = Math.round(new Float(pBytesRead) / new Float(pContentLength)*100);
  51.                    hs.setAttribute("proInfo", pri);
  52.                }
  53.             });
  54.         //     Parse the request
  55.         List items = upload.parseRequest(request);
  56.       //   Process the uploaded items
  57.       Iterator iter = items.iterator();
  58.       while (iter.hasNext()) {
  59.           FileItem item = (FileItem) iter.next();
  60.           if (item.isFormField()) {
  61.               String name = item.getFieldName();
  62.               String value = item.getString("utf-8");
  63.               System.out.println("this is common feild!"+name+"="+value);
  64.           } else {
  65.               System.out.println("this is file feild!");
  66.                String fieldName = item.getFieldName();
  67.                   String fileName = item.getName().substring(item.getName().lastIndexOf("\\")+1);;
  68.                   String contentType = item.getContentType();
  69.                   boolean isInMemory = item.isInMemory();
  70.                   long sizeInBytes = item.getSize();
  71.                   File uploadedFile = new File("c://"+fileName);
  72.                   item.write(uploadedFile);  
  73.  
  74.           }
  75.       }  
  76.  
  77.         return mv;
  78.     }  
  79.  
  80.     /**
  81.      * process 获取进度
  82.      */
  83.     @RequestMapping(value = "/process.action", method = RequestMethod.GET)
  84.     public @ResponseBody Object process(HttpServletRequest request,HttpServletResponse response) throws Exception {
  85.         return ( ProcessInfo)request.getSession().getAttribute("proInfo");
  86.     }
  87.     //精度条pojo
  88.     class ProcessInfo{
  89.         public long totalSize = 1;
  90.         public long readSize = 0;
  91.         public String show = "";
  92.         public int itemNum = 0;
  93.         public int rate = 0;
  94.     }
  95. }

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Z9aQAAMC2ePXu2trY2tsB97969b7/9dtIXBQAA0+Lbb7+9f//+2AL33bt3nwEAAIG7d++OM3D/DwAAEBhz4P4GAAAIjDlw/zcAABAYc+D+GgAACIw5cD8FAAACYw7cjwEAgMCYA/cjAAAgMObA/RAAAAiMOXDfBwAAAmMO3PcAAIDAmAP3LwEAgMCYA/d/AgAAgTEHbgAAoGCcgfsOAAAQGHPg/g8AACAw5sD97wAAQGDMgfvnAABAYMyB+98AAIDAmAP3vwIAAIExB+6bAABAYMyB+18AAIDAmAP3CgAAEBhz4P5nAAAgIHADAECDBG4AAGiQwA0AAA0SuAEAoEECNwAANGicgfvevXsyNwAADNy9e/f+/ftjC9zPnz9/8ODBpC8KAACmxYMHD9bW1sYWuHd2dr788suvvvrq1q1bk740AACYpFu3bj148ODLL7/c3t4eW+DuZu7nz59395YAAMBH6/79+2tra8dP28XADQAAjFcxcN+4cWNhYWF+6i0sLNy4cWMitwwAAEaXC9yLS0vXr19/8+bN/tR78+bN9evXF5eWJnXjAABgFLnA3el0Njc39/b2/j719vb2Njc3O53OpG4cAACMIhe45+fn9/f3J52lR7W/vz8/Pz+pGwcAAKMoBu7379//7YR4//69wA0AwJSLBO6/nhACNwAA0y8SuP9yQgjcAABMv2Lg3tvb+/MY3PksO/tP/zeOkdL29vYEbgAAptxUBe5Br5G6C9wAAEy/SODeGoM7n2VnL/+22e4CNwAA0y8SuN9Wu/1pNvDp7bdvb3+anb38YnCs+/r2p9nZy5d7LfuHS5W3Yw1evLh8NneCFIEbAIDpVwzcu7u7P1b4+vMz2ZnPv+6+uXnhws0ff7x5Iazpvb55IcuyCzd7deXKrz8/k3s9aDpoORgzaXd3V+AGAGDKRQL3ywpPL53JsvMrYdXK+ezMpaeF14XKbpdoy2iv8GiSwA0AwPSLBO6NaivnBxs+zq9037cuPRkc674OK59calW0jPYKjyYJ3AAATL9i4H737t0PI1o+l2Xnln9YPpe1Fh4PqrqvC5XZueVyZUWv8GjSu3fvBG4AAKbcIQP38rlhEH680GotPP7h8UKrm6d/eLzQysqJeZC3Dxe4e30EbgAATrRI4P6+yhefDJ9R0rr4KFfXunjxk15lrNn3X3xS83pY+ehiK8uyLPvki/RUBG4AAKZfMXDv7OysnxA7OzsCNwAAUy4SuH9/QgjcAABMv2Lg3t7e/u6E2N7eFrgBAJhyucDd6XRevXq1tbX1u6m3tbX16tWrTqczqRsHAACjyAXupaWla9euvX79envqvX79+tq1a0tLS5O6cQAAMIqs8P7KlSudTmd+6nU6nStXrkzklgEAwOiKgRsAABgjgRsAABokcAMAQIMEbgAAaJDADQAADRK4AQCgQQI3AAA0SOAGAIAGCdwAANAggRsAABokcAMAQIMEbgAAaJDADQAADRK4AQCgQQI3AAA0SOAGAIAGCdwAANAggRsAABokcAMAQIMEbgAAaJDADQAADRK4AQCgQQI3AAA0SOAGAIAGCdwAANAggRsAABokcAMAQIMEbgAAaJDADQAADRK4AQCgQQI3AAA06P8BpLKnZhm8FPUAAAAASUVORK5CYII=" alt="" />

4.SpringMVC中servletFileUpload.parseRequest(request)解析为空获取不到数据问题

问题产生的原因

先看一下springmvc中上传的配置

  1.   <bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  2.             <property name="defaultEncoding" value="UTF-8" />
  3.             <property name="maxUploadSize" value="2000000000" />
  4.   </bean>

再看看controller中使用

方式一

  1.  public void upload2(HttpServletRequest request) {
  2.             // 转型为MultipartHttpRequest
  3.             try {
  4.                 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
  5.                 List<MultipartFile> fileList = multipartRequest.getFiles("file");
  6.                 for (MultipartFile mf : fileList) {
  7.                     if(!mf.isEmpty()){  
  8.  
  9.                     }
  10.                 }
  11.             } catch (Exception e) {
  12.                 e.printStackTrace();
  13.             }  
  14.  
  15.         }

方式二

  1.  public String upload(HttpServletRequest request,
  2.                 @RequestParam(value = "file") MultipartFile[] files) {
  3.             try {
  4.                 for (MultipartFile mf : files) {
  5.                     if(!mf.isEmpty()){  
  6.  
  7.                     }
  8.                 }  
  9.  
  10.             } catch (Exception e) {
  11.                 e.printStackTrace();
  12.             }
  13.             return "upload";
  14.         }

这里springMVC 都为我们封装好成自己的文件对象了,转换的过程就在我们所配置的CommonsMultipartResolver这个转换器里面.他的转换器里面就是调用common-fileupload的方式解析,然后再使用parseFileItems()方法封装成自己的文件对象.大家应该发现了上面的这句代码,已经使用过fileUpload解析过request了,你在Controller里面接收到的request都已经是解析过的,你再次使用upload进行解析获取到的肯定是空,这个就是问题的所在

解决方式一(以上案例就是用此解决方法)

1.删除mvc里面上传的配置

  1. <!--         <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> -->
  2. <!--          指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->
  3. <!--         <property name="maxUploadSize" value="200000"/>   -->
  4. <!--         </bean> -->

2.在控制器里面自己完成request的解析(当然上面spring MVC提供的两种方法是不能用的,所有上传的地方都需要自己做处理)

  1. public void upload3(HttpServletRequest request) {
  2.             DiskFileItemFactory factory = new DiskFileItemFactory();
  3.             ServletFileUpload upload = new ServletFileUpload(factory);
  4.             try {
  5.                 List<FileItem> list = upload.parseRequest(request);
  6.                 for(FileItem item : list){
  7.                     if(item.isFormField()){  
  8.  
  9.                     }else{
  10.                         //item.write(new File(""));
  11.                     }
  12.                 }
  13.             } catch (FileUploadException e) {
  14.                 e.printStackTrace();
  15.             }  
  16.  
  17.         }

解决方式二(重写listener)

1.创建状态pojo

  1. public class Progress {
  2.  
  3.      public long totalSize = 1;
  4.      public long readSize = 0;
  5.      public String show = "";
  6.      public int itemNum = 0;
  7.      public int rate = 0;
  8.  
  9.     public void setTotalSize(long totalSize) {
  10.         this.totalSize = totalSize;
  11.     }
  12.  
  13.     public void setReadSize(long readSize) {
  14.         this.readSize = readSize;
  15.     }
  16.     public String getShow() {
  17.         return readSize+"/"+totalSize+" byte";
  18.     }
  19.  
  20.     public int getItemNum() {
  21.         return itemNum;
  22.     }
  23.     public void setItemNum(int itemNum) {
  24.         this.itemNum = itemNum;
  25.     }
  26.     public int getRate() {
  27.         return Math.round(new Float(readSize) / new Float(totalSize)*100);
  28.     }
  29. }

2.写自己的listener

  1. import javax.servlet.http.HttpSession;
  2.  
  3. import org.apache.commons.fileupload.ProgressListener;
  4.  
  5. public class FileUploadListener implements ProgressListener{
  6.  
  7.         private HttpSession session;  
  8.  
  9.         public void setSession(HttpSession session){
  10.             this.session=session;
  11.             Progress status = new Progress();
  12.             session.setAttribute("status", status);
  13.         }  
  14.  
  15.         /*
  16.          * pBytesRead 到目前为止读取文件的比特数 pContentLength 文件总大小 pItems 目前正在读取第几个文件
  17.          */
  18.         public void update(long pBytesRead, long pContentLength, int pItems) {
  19.             Progress status = (Progress) session.getAttribute("status");
  20.             status.setReadSize(pBytesRead);
  21.             status.setTotalSize(pContentLength);
  22.             status.setItemNum(pItems);
  23.         } 
  24.  
  25. }

3.写自己的resolver

  1. public class CommonsMultipartResolverExt extends CommonsMultipartResolver{
  2.  
  3.      @Override
  4.         protected MultipartParsingResult parseRequest(HttpServletRequest request)
  5.                 throws MultipartException {
  6.             FileUploadListener listener = new FileUploadListener();
  7.             listener.setSession(request.getSession());
  8.             String encoding = determineEncoding(request);
  9.             FileUpload fileUpload = prepareFileUpload(encoding);
  10.             fileUpload.setProgressListener(listener);
  11.             try {
  12.                 List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
  13.                 return parseFileItems(fileItems, encoding);
  14.             }
  15.             catch (FileUploadBase.SizeLimitExceededException ex) {
  16.                 throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
  17.             }
  18.             catch (FileUploadException ex) {
  19.                 throw new MultipartException("Could not parse multipart servlet request", ex);
  20.             }
  21.         }
  22. }

4.配置上传resolver

  1.     <bean id="multipartResolver" class="com.fyh.www.common.CommonsMultipartResolverExt"></bean>

5.测试

  1. @Controller
  2. @RequestMapping("/test2")
  3. public class FileUploadController2 {
  4.  
  5.     private final    Logger log = Logger.getLogger(FileUploadController2.class);  
  6.  
  7.     /**
  8.      * upload  上传文件
  9.      */
  10.     @RequestMapping(value = "/testbar.action", method = RequestMethod.POST)
  11.     public ModelAndView upload(HttpServletRequest request,HttpServletResponse response) throws Exception {
  12.         ModelAndView mv = new ModelAndView();
  13.         MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest) request;
  14.         MultipartFile file = multipartRequest.getFile("file");
  15.  
  16.         InputStream inputStream = file.getInputStream();
  17.  
  18.         FileUtils.copyInputStreamToFile(inputStream, new File("e://"+file.getOriginalFilename()));
  19.  
  20.         return mv;
  21.     }  
  22.  
  23.     /**
  24.      * process 获取进度
  25.      */
  26.     @RequestMapping(value = "/process.action", method = RequestMethod.GET)
  27.     public @ResponseBody Object process(HttpServletRequest request,HttpServletResponse response) throws Exception {
  28.         return ( Progress)request.getSession().getAttribute("status");
  29.     }   
  30.  
  31. }

此方案在获取监控进度的同时并不因影响mvc原有上传方法的使用

解决方式三(需要用到进度条的上传时,写独立的servlet,servlet+apache uploadfile  与springmvc互不干预)不建议用此方法

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