FormFile file = uploadFile.getFile();

            String uuidName = UUID.randomUUID().toString();

            String video_Name = uuidName+file.getFileName();

            String video_Time = uploadFile.getVideo_Time();

            System.out.println("时间＝"+video_Time);

ServletContext servletContext = this.getServlet().getServletContext();

            String path = servletContext.getRealPath("");

            FileOutputStream out = new FileOutputStream(path+"/uploadV/"+video_Name);

            out.write(file.getFileData());

            out.flush();

            out.close();

            UpLoadManager ulm = new UpLoadManager();

            boolean flag = ulm.videoAdd(video_Name, video_Time);

            if(flag){

                  request.setAttribute("currentTime", new Date());

                  request.setAttribute("upload", "success");

                  return mapping.findForward("upload");

            }

            request.setAttribute("upload", "fail");

             return mapping.findForward("AuploadV");

　　path表示得到当前项目下webRoot 的路径，为了保存视频，在webRoot下建立了一个名为uploadV的文件夹，把视频保存在tomcat服务器下。同时为避免出现相同文件名的视频名字，每个视频上传之前在视频名前加了一段唯一的UUID字符编码，对应数据可存入tb_video表中的video_Name字段，将来在显示视频的详细信息时同样根据video_Name来寻找视频。

　　学生下载视频，用video_Name查找下载视频。下载视频的代码如下：

UpLoadForm ulf = (UpLoadForm)form;

              String video_Name = ulf.getVideo_Name();

              video_Name = new String(video_Name.getBytes("ISO-8859-1"),"GB18030");

              ServletContext servletContext = this.getServlet().getServletContext();

              String path = servletContext.getRealPath("");

              FileInputStream inPut = new FileInputStream(path+"/uploadV/"+video_Name);

              response.setContentType("application/x-msdownload");

              response.setHeader("Content-Disposition", "attachment; filename=" + new String(video_Name.getBytes("GB18030"),"ISO-8859-1"));

              OutputStream out = response.getOutputStream();

              byte[] b = new byte[1024*1024];

              while(inPut.read(b)>0){

                     out.write(b);

                     out.flush();

              }

              inPut.close();

              out.close();

　　教师可以根据video_Name删除某些视频,调用delVideo()方法将相关信息删除。关键代码如下：             

UpLoadForm ulf = (UpLoadForm)form;

              String video_Name = ulf.getVideo_Name();

              ServletContext servletContext = this.getServlet().getServletContext();

              String path = servletContext.getRealPath("");

              File  filename = new File(path+"/uploadV/"+video_Name);

              filename.delete();

              UpLoadManager um = new UpLoadManager();

              boolean flag = um.delVideo(video_Name);

　　本模块在学生用户的主页是学生将自己的作业上传到服务器下的uploadT文件夹中，还可以下载老师批改后上传的作业。在教师用户的主页中老师将学生上传的作业下载下来，之后再将批改好的作业上传到服务器中，供学生下载。上传作业与上传视频类似，只不过多了个String user_name = uploadFile.getUser_name();用来收集上传试卷的用户名。关键代码如下：

UpLoadForm uploadFile = (UpLoadForm)form;

           FormFile file = uploadFile.getFile();

           String test_Name = file.getFileName();

           String test_Time = uploadFile.getTest_Time();

           String user_name = uploadFile.getUser_name();

           System.out.println("时间＝"+test_Time);

            ServletContext servletContext = this.getServlet().getServletContext();

           String path = servletContext.getRealPath("");

            FileOutputStream outPut = new FileOutputStream(path+"/uploadT/"+file.getFileName());

           outPut.write(file.getFileData());

           outPut.flush();

           outPut.close();

            UpLoadManager ulm = new UpLoadManager();

            boolean flag = ulm.testAdd(test_Name, test_Time,user_name);

　　学生上传作业页面如图6-8所示：

图6-8学生上传作业页面

　　在这个模块中学生和教师可以在线交流，学生可以向老师在线提出问题，老师将在线回答。

　　学生或者教师将说的话发送，将先存到数据中，随之再将数据库中的后20条记录取出，在message.jsp中显示。在线答疑页面的主要代码如下：

<frameset rows="*" cols="*,250" framespacing="1" frameborder="yes" bordercolor="#99ffff" >

      <frameset rows="*,117" cols="*" framespacing="0" frameborder="yes">

      <frame src="message.jsp" frameborder="1">

      <frame src="control.jsp" frameb