Struts2.1.8.1 页面跳转不过去有关问题

//action方法里面就写了这么几句话  public String execute(){        System.out.println("empNo = "+this.getEmpNo());        try{            HttpServletResponse response = ServletActionContext.getResponse();            PrintWriter out = response.getWriter();            out.println("{success:true}");//            out.println(true);            out.flush();            out.close();        }catch(Exception ex){            ex.printStackTrace();        }                return SUCCESS;    }//struts.xml里面的配置只配置另一个action<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <package name="struts2" extends="struts-default" namespace="/">        <action name="addEmployee" class="com.cocobra.action.EmployeeAddAction">            <result>/showEmployee.jsp</result>        </action>    </package> </struts>//js里面的请求function submit() {    Ext.getCmp("empForm").getForm().submit({                waitMsg : "正在提交数据……",                waitTitle : "提示",                url : "addEmployee.action",                method : "POST",                success : function(form, action) {                    Ext.Msg.alert(" 提示", "保存成功!");                },                failure : function(formm, action) {                    Ext.Msg.alert(" 提示", "保存失败:");                }            });}//在提交数据，保存成功之后，想让它跳转到showEmployee.jsp 这个页面，可是没有任何跳转，这是怎么回事？