jsp页面：

$(document).ready(function() {

setInterval(function myTimer()

{

//alert('a');

getViews();

},1000);

});

//播放

function getViews(){

$.ajax({

'url':"${pageContext.request.contextPath}/video/getVideos.action?r="+Math.random()+"&open=1",

'data': '',

'dataType': 'json',

'type': 'get',

'error': function(data){

alert("error");

return false;

},

'success': function(data) {

if(null != data && '' != data){

//alert(data.updateFlag);

if(data.updateFlag==0){//如果data.updateFlag=0 不刷新

//alert("data.updateFlag=0");

}

else{

if(data.videoIds != null && data.videoIds != ""){

var listIds=data.videoIds;

var i=0;

for(;i

//alert("show:"+i+"id=:"+listIds[i]);

showView(listIds[i],i);//播放

}

for(var j=listIds.length;j<9;++j){

//alert("Stop:"+j);

StopPlayVideo(j);

}

}

}

}

}

});

}

此处由于此代码实现的功能是通过ajax定时访问后台Hashtable，所以为了是系统区别url不同、ajax返回值不同，特意在url后加上r=+Math.random()

java后台处理方法：

/**

* 双服务器九宫格显示

*

* @return

*/

@Action(value = "getVideos" ,results={

@Result(name = SUCCESS,location="videos2.jsp")

})

public String getVideos() {

if (open == 301) {

return SUCCESS;

} else {

try {

VideoHashTable videoHashTable = VideoHashTable.getInstance();

Hashtable hashTable = videoHashTable.getRht();

Map map = new HashMap>();

if (videoHashTable.isUpdateFlag() == true) {

Enumeration en = hashTable.keys();

videoIds = new ArrayList();

while (en.hasMoreElements()) {

Long key = (Long) en.nextElement();

// vth.get(key);

videoIds.add(key);

}

map.put("videoIds", videoIds);

map.put("updateFlag", 1L);

videoHashTable.setUpdateFlag(false);

System.out.println("getVideos:" + videoIds);

SendMessage.sendObject(map);

} else {

map.put("updateFlag", 0L);

SendMessage.sendObject(map);

}

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

}

关键要把传到jsp的页面存到map中，在通过json传值。

SendMessage.sendObject(map)方法所在类及方法：

package com.supcon.honcomb.utils;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import org.apache.http.HttpResponse;

import org.apache.struts2.ServletActionContext;

public class SendMessage {

public static void sendMessage(String responseText){

try {

PrintWriter out = ServletActionContext.getResponse().getWriter();

out.print(responseText);

out.close();

} catch (IOException e) {

e.printStackTrace();

}

}

public static void sendObject(Object obj) throws Exception {

PrintWriter pw;

String rtn = "";

HttpServletResponse response = ServletActionContext.getResponse();

response.setContentType("text/html");

response.setCharacterEncoding("UTF-8");

rtn = JsonUtil.JsonFromObject(obj);

pw = response.getWriter();

pw.write(rtn);

pw.flush();

pw.close();

}

}