使用Struts2如何实现一个进度条功能

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



 
  
  
  
  
    
  
  
  
  
  
  
  
  
  
 
 
  
    

        

          

            

              
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            ${msg }
          
           

           
             当前上传：
             文件名
           
           

           

             当前上传的速度:80.23k/s
             已上传:10.86M/10.86M
             剩余时间:00秒
           
           

           

             

               

                 

                   文件上传
                    
                 
               
               

                 
                   标题
                   
                 
               
               

                 

                   分类
                   
                   传统文学
                   民间手工艺
                   节假日常
                  
                
               
               

                 

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package video.action;

import org.apache.commons.fileupload.ProgressListener;

public class UploadListener implements ProgressListener {
  private UploadStatus status;
  
  public UploadListener(UploadStatus status) {
    this.status = status;
  }

   public void update(long bytesRead, long contentLength, int items) {
      // 上传组件会调用该方法
      status.setBytesRead(bytesRead); // 已读取的数据长度
      status.setContentLength(contentLength); // 文件总长度
      status.setItems(items); // 正在保存第几个文件
      
   }
  
}

protected List parseRequest(HttpServletRequest servletRequest, String saveDir) throws FileUploadException {
     UploadStatus status = new UploadStatus(); // 上传状态
     UploadListener listner = new UploadListener(status); // 监听器
     servletRequest.getSession().setAttribute("uploadStatus", status);//将上传的进度状态存放进Session;
    
     DiskFileItemFactory fac = createDiskFileItemFactory(saveDir);
     ServletFileUpload upload = createServletFileUpload(fac);
     
     upload.setProgressListener(listner);// 添加监听器
    return upload.parseRequest(createRequestContext(servletRequest));
  }

package video.action;

public class UploadStatus {
  private long bytesRead; // 已经上传的字节数，单位：字节
  private long contentLength; // 所有文件的总长度，单位：字节
  private int items; // 正在上传第几个文件
  private long startTime = System.currentTimeMillis(); // 开始上传的时间，用于计算上传速度等
  
  public long getBytesRead() {
    return bytesRead;
  }

  public void setBytesRead(long bytesRead) {
    this.bytesRead = bytesRead;
  }

  public long getContentLength() {
    return contentLength;
  }

  public void setContentLength(long contentLength) {
    this.contentLength = contentLength;
  }

  public int getItems() {
    return items;
  }

  public void setItems(int items) {
    this.items = items;
  }

  public long getStartTime() {
    return startTime;
  }

  public void setStartTime(long startTime) {
    this.startTime = startTime;
  }
}

package video.action;

import java.util.HashMap;
import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class UploadListenAction extends ActionSupport implements SessionAware{
  private UploadStatus status;
  Map session;
  Map progressInfo=new HashMap<>();
  @Override
  public String execute() throws Exception {
    // TODO Auto-generated method stub
    status=(UploadStatus)session.get("uploadStatus");
    if(status!=null){
      long startTime = status.getStartTime(); //上传开始时间
      long currentTime = System.currentTimeMillis(); //现在时间
      long time = (currentTime - startTime)/ 1000 + 1; //已传输的时间 单位:s
      //传输速度单位:byte/s
      double velocity = ((double)status.getBytesRead()/1000) / (double)time;
     //估计总时间
      double totalTime = status.getContentLength()/velocity;
     //估计剩余时间
      double timeLeft = totalTime - time;
      //已经完成的百分比
      int percent = (int)(100 * (double)status.getBytesRead() / (double)status.getContentLength());
      //已经完成数单位:m
      double length = ((double) status.getBytesRead())/1024/1024;
      //总长度 单位:m
      double totalLength = ((double) status.getContentLength())/1024/1024;
      progressInfo.put("percent", String.valueOf(percent));
      progressInfo.put("velocity", String.valueOf(velocity));
      progressInfo.put("totalTime", String.valueOf(totalTime));
      progressInfo.put("timeLeft", String.valueOf(timeLeft));
      progressInfo.put("length", String.valueOf(length));
      progressInfo.put("totalLength", String.valueOf(totalLength));
    }
    
    return super.execute();
  }
  @Override
  public void setSession(Map session) {
    // TODO Auto-generated method stub
    this.session=session;
  }
  public Map getProgressInfo() {
    return progressInfo;
  }
  
  /*public UploadStatus getStatus() {
    return status;
  }*/
  
}

package video.action;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import javax.servlet.ServletContext;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.SessionAware;

import video.dao.UploadDao;
import video.daoimpl.UploadDaoImpl;
import videomodel.VideoInfo;
import cn.history.pojo.User;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class UploadFile extends ActionSupport{
  private static final long serialVersionUID = 4182168930616232826L;
  private String name;  //标题名
  private File video;    
  private String videoFileName;
  private String videoContentType;
  private String videoDesc;  //描述
  private int cate;      //类型
  private String tag;      //标签
  /*private VideoInfo videoInfo=new VideoInfo();*/
  private String msg;

  private UploadDao uploadDao=new UploadDaoImpl();
  public String upload() throws Exception{
    //完成上传
    ServletContext sc=ServletActionContext.getServletContext();
    String directory=sc.getRealPath("/video");//得到存放文件的真是目录
    //根据视频的不同类型，存放在不同的目录下
    if(cate==1){  //如果是传统文学
      directory=directory+"/guoxue";
    }else if(cate==2){
      directory=directory+"/minjian";
    }else{
      directory=directory+"/jiari";
    }
    SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmssS");//格式化时间输出
    String Rname=null;
    if(name!=null&&!name.equals("")){
      Rname=name+"_"+sdf.format(new Date())+".mp4";
    }else{
      Rname=videoFileName;
    }
    System.out.println(Rname);
    //构建目标文件
    File target=new File(directory,Rname);
    FileUtils.copyFile(video, target);
    System.out.println(Rname+"\n"+videoFileName+"\n"+videoDesc+"\n"+videoContentType);
    //将成功上传的视频基本信息保存至数据库m
    String filePath=target.getPath();
    filePath=filePath.substring(filePath.indexOf("video")).replace("\\", "/");
    System.out.println(filePath);
    VideoInfo videoInfo=new VideoInfo();
    videoInfo.setVideoName(Rname);
    videoInfo.setVideoDesc(videoDesc);
    videoInfo.setVideoUrl(filePath);
    videoInfo.setCate(cate);
    videoInfo.setTag(tag);
    //ActionContext.getContext().getSession().get("name");
    if(ActionContext.getContext().getSession().get("user")!=null){
      User user=(User) ActionContext.getContext().getSession().get("user");
      videoInfo.setAuthorId(user.getUser_id());
    }else{
      //设置为管理员的id，默认是管理员上传的
      videoInfo.setAuthorId(1);
    }
    int tag=uploadDao.saveVideo(videoInfo);
    if(tag==0){
      msg="上传失败(存储数据库过程出错)";
      return INPUT;
    }else{
      msg="视频上传成功";
    }
    return SUCCESS;
  }
  
/*  public VideoInfo getVideoInfo() {
    return videoInfo;
  }

  public void setVideoInfo(VideoInfo videoInfo) {
    this.videoInfo = videoInfo;
  }*/

  /*public String getName() {
    return name;
  }*/

  public void setName(String name) {
    this.name = name;
  }

//  public File getVideo() {
//    return video;
//  }

  public void setVideo(File video) {
    System.out.println(video);
    this.video = video;
  }
  
//  public String getVideoDesc() {
//    return videoDesc;
//  }
  public void setVideoDesc(String videoDesc) {
    this.videoDesc = videoDesc;
  }
  
  /*public int getCate() {
    return cate;
  }*/

  public void setCate(int cate) {
    this.cate = cate;
  }
  
  /*public String getTag() {
    return tag;
  }*/

  public void setTag(String tag) {
    this.tag = tag;
  }

//  public String getVideoFileName() {
//    return videoFileName;
//  }

  public void setVideoFileName(String videoFileName) {
    this.videoFileName = videoFileName;
  }

  /*public String getVideoContentType() {
    return videoContentType;
  }*/

  public void setVideoContentType(String videoContentType) {
    this.videoContentType = videoContentType;
  }
  public String getMsg() {
    return msg;
  }
  public void setMsg(String msg) {
    this.msg = msg;
  }
}