http://www.blogjava.net/supercrsky/articles/219961

Prototype1.6 实战11 (Ajax)

jsp:

<% @ page language = " java "  pageEncoding = " gbk " %>
< html >
   < head >
     < title > Ajax Test </ title >
   < script  type ="text/javascript"  src ="prototype.js" ></ script >
  < script >
      // 你的action,当然也可以传参
      var  url  =   " ${pageContext.request.contextPath}/ServiceServlet " ;
     
      function  test()
      {
          // Ajax request
          new  Ajax.Request(url,
          {
             method:  " post " ,   // post method
             onSuccess :  function (response)      // callback function
              {
                 $( " d " ).innerHTML  =  response.responseText;
             }
         }
         );
     }     
     
      // 注册响应事件
     Ajax.Responders.register(
      {
          // 请求时事件
         onCreate :  function ()
          {
             Element.show( " loading " );
         }
         ,
         onComplete :  function ()
          {
              // 活动的请求全部完成时时
              if (Ajax.activeRequestCount  ==   0 )
              {
                 Element.hide( " loading " );
             }
         }
     } );
     
  </ script >  
  
   </ head >
   < body >
   < input  type ="button"  onclick ="test();"  title ="注意观察页面刷新了吗?"  value ="点我试试" />
   < div  id ="loading"  style ="display: none;" ></ div >
   < div  id ="d" ></ div >
   </ body >
</ html >

servlet:

package  com.test;

import  java.io.IOException;
import  java.io.PrintWriter;

import  javax.servlet.ServletException;
import  javax.servlet.http.HttpServlet;
import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.http.HttpServletResponse;

@SuppressWarnings( " serial " )
public   class  ServiceServlet  extends  HttpServlet
{

     public   void  doGet(HttpServletRequest request, HttpServletResponse response)
             throws  ServletException, IOException
     {
         this .doPost(request, response);
    }

     public   void  doPost(HttpServletRequest request, HttpServletResponse response)
             throws  ServletException, IOException
     {
        String msg  =   " 如果您看到此消息说明已经成功了! " ;
        response.setContentType( " text/html " );
        response.setCharacterEncoding( " gbk " );
        PrintWriter out  =  response.getWriter();
        out.print(msg);
    }

}