使用Struts2如何實現(xiàn)一個進度條功能

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前臺的頁面效果圖：

使用Struts2如何實現(xiàn)一個進度條功能

前臺進度條控件選擇使用easyui 的progressbar控件。

一.前臺的代碼:

<%@ 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+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>" rel="external nofollow" >
  <title>My JSP 'uploadVideo.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">  
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <link rel="stylesheet" href="demo.css" rel="external nofollow" />
  <link rel="stylesheet" href="easyui.css" rel="external nofollow" />
  <link rel="stylesheet" href="icon.css" rel="external nofollow" />
  <script type="text/javascript" src="jquery.min.js" ></script>
  <script type="text/javascript" src="jquery.easyui.min.js" ></script>
  <link rel="stylesheet" href="videoCss/upload.css" rel="external nofollow" />
  <script>
  $(function() {
    var pro=0;
    $("#save").click(function(){
      saveDate();
      setinterval=setInterval(showUploadProgress, 100); 
    });
    function saveDate(){
    var form = new FormData(document.getElementById("form"));
      $.ajax({
        type:"POST",
        url:"uploadfile.action",
        data:form,
        async:false,
        cache:false,
        processData:false,
        contentType:false,
        success:function(result){
          var msg=result.msg;
          $(".msg").text(msg);
        },
        error:function(){
          alert("file異步提交失敗");
        }
      });
    }
    
    function showUploadProgress(){
      $.ajax({
        type:"GET",
        url:"uploadProgress.action",
        dataType:"json",
        async:false,
        cache:false,
        success:function(result){
          var progressInfo=result.progressInfo;
          pro=progressInfo.percent;
          if(pro==100){
            clearInterval(setinterval);
          }
          $('#progress').progressbar('setValue', progressInfo.percent);
          $('progress-bar-status').find(".speed").text(progressInfo.velocity);
          $('progress-bar-status').find(".finished").text("已上傳:"+progressInfo.length+"/"+progressInfo.totalLength);
          $('progress-bar-status').find(".remain").text(progressInfo.timeLeft);
        },
        error:function(result){
           alert("error1"); 
        }
      });
    }
    
    
    
  });
  </script>
 </head>
 
  <body>
    <div class="main_wrapper">
        <div class="head_wrapper">
          <div class="headinside">
            <ul>
              <li><a href="">主站</a></li>
              <li><a href="">視頻欄</a></li>
              <li><a href="">資源區(qū)</a></li>
              <li><a href="">個人中心</a></li>
            </ul>
          </div>  
        </div><!--head_wrapper結束-->
        <div class="upload_box">
          <p id="error">
            <s:fielderror name="struts.messages.error.content.type.not.allowed"></s:fielderror>
            <s:actionerror/>
            <font color="red" class="msg">${msg }</font>
          </p>
           <div class="uploadInfo">
           <span class="title">
             當前上傳：
             <span class="filename">文件名</span>
           </span>
           <div id="progress" class="easyui-progressbar" ></div>
           <div class="progress-bar-status">
             <span class="speed" >當前上傳的速度:80.23k/s</span>
             <span class="finished">已上傳:10.86M/10.86M</span>
             <span class="remain" >剩余時間:00秒</span>
           </div>
           <div class="videoInfo">
           <form method="post" enctype="multipart/form-data" id="form">
             <ul>
               <li>
                 <div>
                   <label for="video1">文件上傳</label>
                    <input type="file" id="btn_file" name="video"/>
                 </div>
               </li>
               <li>
                 
                   <label for="name">標題</label>
                   <input type="text" name="name" id="name" title="標題" placeholder="給你的視頻七個標題名吧"/>
                 
               </li>
               <li>
                 <div>
                   <label for="cate">分類</label>
                   <select class="cate" id="cate" name="cate">
                   <option value ="1">傳統(tǒng)文學</option>
                   <option value ="2">民間手工藝</option>
                   <option value="3">節(jié)假日常</option>
                  </select>
                </div>
               </li>
               <li>
                 <div>
                   <label for="tag">標簽</label>
                   <input type="text" name="tag" id="tag" placeholder="請給您的視頻添加相應的標簽"/>
                 </div>
               </li>
               <li>
                 <div>
                   <label for="desc" id="label_desc">描述</label>
                   <textarea name="videoDesc" id="desc" placeholder="請?zhí)砑酉鄳囊曨l描述" >
                   </textarea>
                 </div>
               </li>
               <input id="save" type="button" value="保存"/>
               <!-- <button id="save">保存</button> -->
             </ul>
           </form>
           </div>
        </div>
        </div>
    </div>
    <div >
         <div class="footer" >
           <div class="inner">
             <p class="a_menu">
               <a target="_blank" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >關于我們</a>
               <i class="line">|</i>
               <a target="_blank" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >聯(lián)系合作</a>
               <i class="line">|</i>
               <a target="_blank" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >幫助中心</a>
               <i class="line">|</i>
               <a target="_blank" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >合伙人計劃</a>
               <i class="line">|</i>
               <a target="_blank" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >版權聲明</a>
             </p>
             <p class="center">
               <span>江西師范大學瑤湖校區(qū)</span>
               <span>java工作室</span>
               <br>
               copyright&copy 大白 
             </p>
           </div>
         </div>
       </div>
   </body>
</html>

二.點擊上傳后，如何獲得文上傳的進度信息。

1.自定義一個UploadListener類實現(xiàn)org.apache.commons.fileupload中的ProgressListener接口，從而獲得當前上傳的文件的已讀取的數(shù)據(jù)長度，文件總長度，正在保存第幾個文件；

2.重寫一個MyMultiPartRequest類，覆蓋org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest，改寫parseRequest方法，在其中為上傳添加監(jiān)聽器；

3.定義一個UploadStatus bean類存放上傳的狀態(tài)信息，并將獲得上傳進度信息的UploadStatus對象存在在Session域中;

4.編寫UploadListenAction，獲取Session域中的UploadStatus對象，進行相應的數(shù)據(jù)處理，然后將需要的數(shù)據(jù)放入Map中以json的形式返回給jsp;

5.編寫UploadFile.action，實現(xiàn)文件的上傳存儲;

三.相對應的代碼。

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) {
      // 上傳組件會調用該方法
      status.setBytesRead(bytesRead); // 已讀取的數(shù)據(jù)長度
      status.setContentLength(contentLength); // 文件總長度
      status.setItems(items); // 正在保存第幾個文件
      
   }
  
}

對于步驟2中MyMultiPartRequest修改后的方法代碼。

protected List<FileItem> parseRequest(HttpServletRequest servletRequest, String saveDir) throws FileUploadException {
     UploadStatus status = new UploadStatus(); // 上傳狀態(tài)
     UploadListener listner = new UploadListener(status); // 監(jiān)聽器
     servletRequest.getSession().setAttribute("uploadStatus", status);//將上傳的進度狀態(tài)存放進Session;
    
     DiskFileItemFactory fac = createDiskFileItemFactory(saveDir);
     ServletFileUpload upload = createServletFileUpload(fac);
     
     upload.setProgressListener(listner);// 添加監(jiān)聽器
    return upload.parseRequest(createRequestContext(servletRequest));
  }
package video.action;

public class UploadStatus {
  private long bytesRead; // 已經上傳的字節(jié)數(shù)，單位：字節(jié)
  private long contentLength; // 所有文件的總長度，單位：字節(jié)
  private int items; // 正在上傳第幾個文件
  private long startTime = System.currentTimeMillis(); // 開始上傳的時間，用于計算上傳速度等
  
  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<String,Object> session;
  Map<String,String> 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(); //上傳開始時間
      long currentTime = System.currentTimeMillis(); //現(xiàn)在時間
      long time = (currentTime - startTime)/ 1000 + 1; //已傳輸?shù)臅r間 單位:s
      //傳輸速度單位:byte/s
      double velocity = ((double)status.getBytesRead()/1000) / (double)time;
     //估計總時間
      double totalTime = status.getContentLength()/velocity;
     //估計剩余時間
      double timeLeft = totalTime - time;
      //已經完成的百分比
      int percent = (int)(100 * (double)status.getBytesRead() / (double)status.getContentLength());
      //已經完成數(shù)單位:m
      double length = ((double) status.getBytesRead())/1024/1024;
      //總長度 單位: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<String, Object> session) {
    // TODO Auto-generated method stub
    this.session=session;
  }
  public Map<String, String> 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;  //標題名
  private File video;    
  private String videoFileName;
  private String videoContentType;
  private String videoDesc;  //描述
  private int cate;      //類型
  private String tag;      //標簽
  /*private VideoInfo videoInfo=new VideoInfo();*/
  private String msg;

  private UploadDao uploadDao=new UploadDaoImpl();
  public String upload() throws Exception{
    //完成上傳
    ServletContext sc=ServletActionContext.getServletContext();
    String directory=sc.getRealPath("/video");//得到存放文件的真是目錄
    //根據(jù)視頻的不同類型，存放在不同的目錄下
    if(cate==1){  //如果是傳統(tǒng)文學
      directory=directory+"/guoxue";
    }else if(cate==2){
      directory=directory+"/minjian";
    }else{
      directory=directory+"/jiari";
    }
    SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmssS");//格式化時間輸出
    String Rname=null;
    if(name!=null&&!name.equals("")){
      Rname=name+"_"+sdf.format(new Date())+".mp4";
    }else{
      Rname=videoFileName;
    }
    System.out.println(Rname);
    //構建目標文件
    File target=new File(directory,Rname);
    FileUtils.copyFile(video, target);
    System.out.println(Rname+"\n"+videoFileName+"\n"+videoDesc+"\n"+videoContentType);
    //將成功上傳的視頻基本信息保存至數(shù)據(jù)庫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{
      //設置為管理員的id，默認是管理員上傳的
      videoInfo.setAuthorId(1);
    }
    int tag=uploadDao.saveVideo(videoInfo);
    if(tag==0){
      msg="上傳失敗(存儲數(shù)據(jù)庫過程出錯)";
      return INPUT;
    }else{
      msg="視頻上傳成功";
    }
    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;
  }
}

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