javascript写的进度条结合struts的action线程判断

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<1>action:IsGoAction

package com.dreamers.search;

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

public class IsGoAction extends ActionSupport{

/**
*
*/
private static final long serialVersionUID = 1L;

public String execute(){
  String name =(String)ActionContext.getContext().getSession().get("nn");

  ThreadGroup group = Thread.currentThread().getThreadGroup();
  ThreadGroup parent = null;
  while ( (parent = group.getParent()) != null ) {
   group = parent;
   }
  Thread[] threads = new Thread[group.activeCount()];
  group.enumerate(threads);
  for(int i = 0; i < threads.length; i++){
   if(threads[i].getName().equals(name)){
    while(threads[i].isAlive()){


    }
   }
}
  System.out.println("isgo action");
  try {
   Thread.sleep(1000);
  } catch (InterruptedException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  return SUCCESS;

}
}

<2>wait.jsp

<%@ page language="java" import="java.util.*" import ="java.io.File"
pageEncoding="GBK"%>
<%@ page contentType="text/html;charset=GBK"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>

            var progress_node_id = "progress";
            function SetProgress(progress) {
                if (progress) {
                    $("#" + progress_node_id + " > span").css("width", String(progress) + "%");
                    $("#" + progress_node_id + " > span").html(String(progress) + "%");
                }
            }

            $(document).ready(function() {
                doProgress();
            });

        </script>

</head>

<body>

<form action="isgo.action" id = "form" name="form">
</form>
<div id="progress"><span> </span></div> //通过设置span的样式来实现进度条，注意进度条完成的总时间是死值，具体是否完成要看action

</body>

</html>

<3>struts.xml中

<action name="isgo" class="com.dreamers.search.IsGoAction">
<result name = "success">/previewdoc.jsp</result> //转到下一个jsp