struts2 ajax请求action调用路径问题

Question

文件路径如下<package name="ajax" extends="json-default" namespace="/ajax">
<action name="userExistsCheck" class="UserAction" method="userExists">
<result type="json">
<!-- 指定不需要序列化输出给客户端的属性列表 -->
<param name="excludeProperties"> users;user;actionMsg;userInfo;id;userService;memberLevelService;session;username;
</param>
</result>
</action>
</package>
jquery调用<script type="text/javascript">      
        jQuery(function(){
       
             $("#username").blur(function(){
                 alert("jaizai");
              var url='/ajax/userExistsCheck.action';
            var params = {
                       username:$('#username').attr('value')      
                };
           $.post(url,params,processResponse,'json');    
          });  
          function processResponse(date){
           if(date.userExists==false){  
                    $("#span1").html("<font color=\"red\">用户名可以使用</font>");  
                    document.getElementById("submit").removeAttribute("disabled");      
               }else{  
                   $("#span1").html("<font color=\"red\">用户名不可以使用</font>");  
                   document.getElementById("submit").disabled = "true";  
                }  
             }
        });     
</script>jquery内的调用路径应该怎样写？

Answer 1

                 var url='/ajax/userExistsCheck!userExists.action';