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这篇文章将为大家详细讲解有关使用Struts2如何实现一个进度条功能，文章内容质量较高，因此小编分享给大家做个参考，希望大家阅读完这篇文章后对相关知识有一定的了解。
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前台的页面效果图：
前台进度条控件选择使用easyui 的progressbar控件。
一.前台的代码:
<%@ 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+"/"; %>My JSP 'uploadVideo.jsp' starting page
二.点击上传后，如何获得文上传的进度信息。
1.自定义一个UploadListener类实现org.apache.commons.fileupload中的ProgressListener接口，从而获得当前上传的文件的已读取的数据长度，文件总长度，正在保存第几个文件；
2.重写一个MyMultiPartRequest类，覆盖org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest，改写parseRequest方法，在其中为上传添加监听器；
3.定义一个UploadStatus bean类存放上传的状态信息，并将获得上传进度信息的UploadStatus对象存在在Session域中;
4.编写UploadListenAction，获取Session域中的UploadStatus对象，进行相应的数据处理，然后将需要的数据放入Map中以json的形式返回给jsp;
5.编写UploadFile.action，实现文件的上传存储;
三.相对应的代码。
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
}
}对于步骤2中MyMultiPartRequest修改后的方法代码。
protected ListparseRequest(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;
}
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