Struts下实现AJAX的小例子

 前台
var xmlHttp;
function creatXMLHttpRequest() { 
    if (window.ActiveXObject) { 
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
    } 
    else if (window.XMLHttpRequest) { 
         xmlHttp = new XMLHttpRequest(); 
    } 
    else { 
        return; 
      } 
    }
function searchName(){
var name = document.getElementsByName("name")[0].value;
if(name != ""){
   creatXMLHttpRequest();
   var url = "/kintai/kintai/action/TestAction.do?name=" + name;
   xmlHttp.open("GET",url,true);
   xmlHttp.onreadystatechange = tmpFind;
   xmlHttp.setRequestHeader("If-Modified-Since","0");
   xmlHttp.send();
}else{
   alert("Is not Null ");
}
}
function tmpFind(){
    if(xmlHttp.readystate == 4){
         if(xmlHttp.status == 200){
            var tmpName = xmlHttp.responseText;
            alert(tmpName == 0?"No have the person":"the person has");
  }
}
}
后台
if(pRequest.getParameter("name") != null){
String[][] conditionList = new String[1][2];
conditionList[0][0] = "0";
conditionList[0][1] = Common.readSqlTrans(pRequest.getParameter("name"));
qryData = pDbcmd.selQureyPrep(new TestDbcl().getInfoUserAjax(), conditionList);
String result = "0";
if(Integer.parseInt(qryData.getRow(0).get("name"))>0){
result = "1";
}
pResponse.setContentType("text/text;charset=UTF-8");
PrintWriter out = pResponse.getWriter();
out.write(result);
out.flush();
return true ;
}