AJAX 解决传中文乱码问题

1.javascript代码

<script type="text/javascript">
//http://www.w3school.com.cn/ajax/index.asp
var xmlHttp;
function getCN(obj)
{
     var author = document.forms[0].u367766562624002.value;   //中文值
     author=encodeURI(author); 
     author=encodeURI(author); //传送的值，2次转码。
     try{
       // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
        }catch (e){
           //Internet Explorer
           try{
                    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
              }catch (e){
                    //  IE6, IE5
                    try{
                         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                      }catch (e){
                         alert("您的浏览器不支持AJAX！");
                         return false;
                      }
              }
        }
        
        xmlHttp.onreadystatechange=function(){
            if(xmlHttp.readyState==4 && xmlHttp.status==200){

                     var result=xmlHttp.responseText;
                     document.forms[0].u367763762460602.value=result;
           }
        };    
        var url = "xzShow.do?show=getcn&uname="+author;    
        xmlHttp.open("POST",url,true);
        xmlHttp.send(null);    
 }
</script>

2.后台java代码

public ActionForward execute(ActionMapping mapping, ActionForm actionform,
        HttpServletRequest request, HttpServletResponse response,
        SessionUser sessionuser) throws Exception {
     
     response.setContentType("text/html");
     response.setCharacterEncoding("GBK");
     PrintWriter out = response.getWriter();
     String uname=StringUtils.trim(request.getParameter("uname"));      
     uname=URLDecoder.decode(uname,"utf8");  //解码
     System.out.println("-----"+uname);
     if(!uname.equals("")){
        out.print("你好"); 
     }
     out.close();
     return null;
}