《struts2權威指南》學習筆記之struts2 ajax標籤s和submit

<s:a>這個標籤產生一個超級連結，用於像伺服器發送非同步請求，並將伺服器響應載入在指定HTML元素中

web.xml

  <? xml version="1.0" encoding="GBK" ?>
< web-app  version ="2.4"  xmlns ="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

< servlet >

     < servlet-name > dwr </ servlet-name >
         < servlet-class > uk.ltd.getahead.dwr.DWRServlet </ servlet-class >
         < init-param >
            < param-name > debug </ param-name >
            < param-value > true </ param-value >
         </ init-param >
     </ servlet >

     < servlet-mapping >
         < servlet-name > dwr </ servlet-name >
         < url-pattern > /dwr/* </ url-pattern >
     </ servlet-mapping >



         < filter >
         < filter-name > struts2 </ filter-name >
         < filter-class > org.apache.struts2.dispatcher.FilterDispatcher </ filter-class >
     </ filter >

     < filter-mapping >
         < filter-name > struts2 </ filter-name >
         < url-pattern > /* </ url-pattern >
     </ filter-mapping >

</ web-app >

 struts.xml

  <! DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd" >

< struts >

     < constant  name ="struts.custom.i18n.resources"  value ="messageResource" />
     < constant  name ="struts.i18n.encoding"  value ="GBK" />

     < package  name ="ajax"  extends ="struts-default" >
         < action  name ="AjaxTest"  class ="lee.AjaxTestAction" >
             < result > /AjaxResult.jsp </ result >
         </ action >
         < action  name ="Test3" >
             < result > /testjs.jsp </ result >
         </ action >
     </ package >

</ struts >

 

RandomAction

  package  lee;

import  com.opensymphony.xwork2.Action;

import  java.io.Serializable;


public   class  AjaxTestAction  implements  Action, Serializable
... {

    private static int counter = 0;
    private String data;

    public long getServerTime()