struts2 + jsonInsert title here function getAjaxObject(){ va

struts2 + json
Insert title here

function getAjaxObject(){
var xmlhttp=null;
if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}else{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlhttp;
}

function tt(){
var userid=document.getElementById("userid").value;
var password=document.getElementById("password").value;
var url="./test?userid="+userid+"&password="+password;
var xmlhttp=getAjaxObject();
xmlhttp.open("GET",url,true);
xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
xmlhttp.send(null);
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState==4&&xmlhttp.status==200){
document.write(xmlhttp.responseText)
}
};
}





==
public String execute(){
String str="{"userid":""+userid+"","password":""+password+""}";
result=str;
return SUCCESS;
}

怎么得到的结果是："{"userid":"123456","password":"123456"}"
会是带引号和转义字符的?