利用extJs的ajax功能及结合js解析xml串无刷新显示数据
利用struts2做服务器端 extJs的ajax无刷新调用struts2刷新数据 还用到js解析服务器端返回的xml串 具体代码如下

struts2代码：

List payList = this.payMgrService.findAllPay(sortId);
   HttpServletResponse response = ServletActionContext.getResponse();
   response.setContentType("text/xml");
   response.setCharacterEncoding("UTF-8");
   response.setHeader("Cache-Control", "no-cache");
   PrintWriter outPrintWriter = null;
   try {
    outPrintWriter = response.getWriter();
   } catch (IOException e) {
    e.printStackTrace();
   }
   String value = "fail";
   if(!payList.isEmpty()){ 
    value = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><pay><size>" + payList.size() + "</size>";
    Map map = new HashMap();
    for(int i=0;i<payList.size();i++){
     map = (Map)payList.get(i);
     value = value
           +"<bussid>" + map.get("BUSS_ID") + "</bussid>"
           +"<name>" + map.get("NAME") + "</name>"
         +"<image>" + map.get("IMAGE") + "</image>"
         +"<url>" + map.get("URL") + "</url>"
         +"<state>" + map.get("STATE") + "</state>" ;       
    }
    value = value + "</pay>";
   } 
   outPrintWriter.write(value);
   outPrintWriter.flush();
   outPrintWriter.close();

extJs及js代码：


function clearTable(){
var tab = document.getElementById("contentTable");
for(var i=0;i<tab.rows.length;i++){
   for(var j=0;j<tab.rows[i].cells.length;j++){
    tab.rows[i].cells[j].innerHTML = "";
   }
}
}

function showContent(sortId){
clearTable();
   Ext.Ajax.request({
    url : '../../notice/findAllPay.action',
    success : function(msg) {
    var res = msg.responseText;      
     if (res == "fail") {
      clearTable();  
     } else {
      var xmlDoc=null;
         //判断浏览器的类型
         //支持IE浏览器
         if(!window.DOMParser && window.ActiveXObject){   //window.DOMParser 判断是否是非ie浏览器
              var xmlDomVersions = ['MSXML.2.DOMDocument.6.0','MSXML.2.DOMDocument.3.0','Microsoft.XMLDOM'];
             for(var i=0;i<xmlDomVersions.length;i++){
                 try{
                      xmlDoc = new ActiveXObject(xmlDomVersions[i]);
                      xmlDoc.async = false;
                      xmlDoc