遇到一个吐血小问题！！！！！！

环境：struts2_spring_hiber + jquery
用：
        $.post("http://localhost/test/test?username="
         +encodeURI(encodeURI(username)),function(data){
         alert("Data Loaded: " + data);
        }); 能把username传到Action中，能在后台打印显示，但用：
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(username);死活不在页面上有alert怀疑我的环境搭建得有问题，之前使用纯action向jsp传值，也是无论如何得不到值。
求神人赐教！！（考虑从头开始另搭建环境）

解决方案 »

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纯action向jsp传值，也是无论如何得不到值。
???
贴代码出来撒，你后台都拿到值了，前台拿不到，说明代码有问题然后你的ajax取值，你的代码呢，也不贴，调用的方法有没错？？？？
package test.s2sh.action;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import com.opensymphony.xwork2.ActionSupport;
public class TestAction extends BaseAction
{
  private String username;
  public String getUsername() {
  return username;
}
public void setUsername(String username) {
  this.username = username;
}
public String test() throws IOException
{
       try {
        String username2 = URLDecoder.decode(username, "UTF-8");
        System.out.println(username2);
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write("dddddd"+username);
       }
      catch (UnsupportedEncodingException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
        }
       return null; 或return SUCCESS;都一样 }
}
package test.s2sh.action;import java.util.Map;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;public class BaseAction extends ActionSupport {
    private static final long serialVersionUID = 7620009925942346125L;
    ActionContext context = ActionContext.getContext();
    HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
    //HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);
    HttpServletResponse response = ServletActionContext.getResponse();
    Map session = context.getSession();
}  struts.xml   <package name="test" extends="struts-default">
        <action name="test" class="testAction" method="test">
            <result name="success">
                /Save_success.jsp  #不跳转，这个其实没用的
            </result>
        </action>
    </package>
index.jsp<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    <title>Test</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript" src="js/jquery.js"></script>

<script>
$(document).ready(function(){
   $("#userBtt").click(function(){
      var username = $("#username").val();
      if(username=="")
      {
         alert("不能为空");
      }
      else
      {
        $.post("http://localhost/test/test?username="
         +encodeURI(encodeURI(username)),function(data){
         alert("Data Loaded: " + data);
        });
      }
   });
}
); </script>  </head>

  <body>
    <table>
        <tr>
           <td>请输入用户名:<input type="text" name="username" id="username"></td>
           <td><input type="button"  value="校验" id="userBtt"></td>
           <td></td>
        </tr>
    </table>
  </body>
</html>
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
response.getWriter().write(username);LZ,试试!
没看出你页面上哪里直接与action取值了
推荐LZ用 STRUTS2的 JSON返回类型很方便
jsp取值我之前试过了一天，都是null。想用一下struts2咋这么难呢to 4楼哥们，我照做了，一样不行（看来是得完全新搭环境了，这五年的程序员白当了）
服务器端不用改，客户端改为：
$.post("http://localhost/test/test",{'username':username},function(data){
    alert(......);
});即可。
$.post("http://localhost/test/test?username="
                    +encodeURI(encodeURI(username)),function(data){
                        alert("Data Loaded: " + data);
            });
试试这样看：var url ="http://localhost/test/test?username="
                    +encodeURI(encodeURI(username);
$.ajax( {
type : "post",
url : url,
dataType : "json",
success :function(data){
                        alert("Data Loaded: " + data);
,
async : false
});
然后：
public String test() throws IOException
    {
         String username2 = URLDecoder.decode(username, "UTF-8");
        System.out.println(username2);
       return SUCCESS;    }
struts.xml文件中和Action的定义不符。
testAction是定义在spring里的bean，估计没关系
用Firefox测和用IE测，反应一个样，啥东西都不弹出来改成这样也不行，但可以在Action中打印到后台：
<script>
$(document).ready(function(){
   $("#userBtt").click(function(){
      var username = $("#username").val();
      var url="http://localhost/test/test?username="+username;
      $.ajax( {
       type : "post",
       url : url,
       success :function(data){
         alert("Data Loaded: " + data);
         },
       async : false
       });
   });
}
);
</script>
服了
虽然你已经结贴，好奇问一句，啥东西都弹不出来，包括
         if(username=="")
          {
             alert("不能为空");
          }
这个么？