使用Struts2如何实现一个进度条功能
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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; Mapsession; 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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