ajax 乱码

function verify() {
//解决中文乱麻问题的方法1，页面端发出的数据作一次encodeURI，服务器段使用new String(old.getBytes("iso8859-1"),"UTF-8");
//解决中文乱麻问题的方法2，页面端发出的数据作两次encodeURI，服务器段使用URLDecoder.decode(old,"UTF-8")
var url = "AJAXServer?name=" + encodeURI(encodeURI($("#userName").val()));
url = convertURL(url);
$.get(url,null,function(data){
$("#result").html(data);
});
}
//给url地址增加时间戳，骗过浏览器，不读取缓存
function convertURL(url) {
//获取时间戳
var timstamp = (new Date()).valueOf();
//将时间戳信息拼接到url上
//url = "AJAXServer"
if (url.indexOf("?") >= 0) {
url = url + "&t=" + timstamp;
} else {
url = url + "?t=" + timstamp;
}
return url;
}
 //1.取参数
            String old = httpServletRequest.getParameter("name");
            //String name = new String(old.getBytes("iso8859-1"),"UTF-8");
            String name = URLDecoder.decode(old,"UTF-8");
  httpServletResponse.setContentType("text/html;charset=utf-8");
String b = new String(dish_id.getBytes("ISO-8859-1"), "UTF-8");
String b = new String(dish_id.getBytes("ISO-8859-1"), "UTF-8");