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http://www.ajaxlines.com/ajax/stuff/article/using_google_is_ajax_search_api_with_java.php
I was rather depressed over a year ago when Google deprecated their SOAP Search API with their AJAX Search API. Essentially Google was saying that they didn want anyone programmatically accessing Google search results unless they were going to be presenting the results unaltered in a rectangular portion of a website. This was particularly troubling to me because, like many academics, I have relied on the API to do automated queries, especially for Warrick.
A few months ago I got a little excited when Google opened their AJAX API to non-JavaScript environments. Google is now allowing queries using a REST-based interface that returns search results using JSON. The purpose of this API is still to show unaltered results to your website is user, but I don see anything in the Terms of Use that prevent the API being used in an automated fashion (having a program regularly execute queries), especially f ......

<html>
<head>
<title></title>
</head>
<mce:script type="text/javascript"></mce:script>
<mce:script type="text/javascript"><!--
function callServer(){
var city = document.getElementById("city");
if(city==null||city=="") return;
var url = "do_ajax.jsp?city="+escape(city);
xmlHttp.open("GET",url,true);
xmlHttp.onreadystatechange = updatePage;//onreadyStateChange事件� ......

js文件:
var where=" where pd_Isjifen=0 and pd_Isok=1"; //查询条件
var psize=16; //查询数据数目
var pindex=0;//当前页数
var order=" order by pd_Update desc,type_sort,pd_brand,pd_typeid"; //排序条件
var temp=0; //模板名称
var Pcount=0;

//获取参数
function getUrlPara(paraName)
{
var str=window.location.search;
if (str.indexOf(paraName)!=-1)
{
var pos_start=str.indexOf(paraName)+paraName.length+1;
var pos_end=str.indexOf("&",pos_start);
if (pos_end==-1)
{
return str.substring(pos_start);
}
else
{
return str.substring(pos_start,pos_end)
}
}
else
{
return "";
}
}

//设置查询条件
function Set_Where()
{
var country=getUrlPara("country");
if(country!='')
{
where+=" and pd_country='" + unescape(country) + "'";
}
var search=getUrlPara("search");
if(search!='')
{
where+=" and " + Get_where(unescape(search));
}

......

项目中想用ajax，于是在网上扒了n多资料，犯了n多错误，从今天上班到现在一直在处理这个问题，终于还是把它解决了。
当我看到页面的ajax显示后，我兴奋异常，为了记录自己学习的ajax历程，也为了让更多的人少走弯路，特写此一文以记之！
废话不说了，为了更好的理解，我重做了一个小的项目，以加深印象。现在就以这个小项目开始我们的ajax之旅。
第一步：创建 ajax Java Web项目。
第二步：加入struts2的jar包，这里需要四个包 freemarker.jar ognl.jar struts2-core.jar commons-fileupload.jar commons-io.jar   xwork-core-2.1.6.jar（这个包加上版本号，是因为下文要提到它），这六个包是struts必须依赖的jar包，什么好说的。
第三步：修改 web.xml 加入 struts的过滤器，代码如下：
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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  & ......

这两天一直在埋头苦练AJAX技术，虽然网上对AJAX的看法各有好坏，在我看来AJAX对我来说还是一个很不错的技术，它在很大的程度上减轻了服务器的负担，把一些简单的request通过利用javascript方法创建一个XMLHttpRequest对象发送和接收服务器的信息，不要通过刷新页面就能得到自己想要的效果，这简直是不可思议。下面给出一段AJAX+Servlet+Javascript一段最简单的代码供初学者参考，注意是初学者哦。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict //EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Sending Request Data Using GET and POST</title>
<script type="text/javascript">...
var xmlHttp;
function createXMLHttpRequest() ...{
   if(window.ActiveXObject) ...{
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
   } else if(window.XMLHttpRequest) ...{
      xmlHttp = new XMLHttpRequest();
   }
}
function ......

Using Google is AJAX Search API with Java ...

Using Google is AJAX Search API with Java ...

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