实例：
一、数据集所在jsp页面out.jsp,代码如下
<%@page contentType="text/plaincharset=UTF-8"
language="java"
import="java.io.*,java.net.*,java.util.*"
buffer="8kb"
session="false"
autoFlush="true"
%>
<%
String jsonData="{data:[{id:200901,name:'name1'},{id:200902,name:'name2'},{id:200903,name:'姓名3'},{id:200904,name:'姓名4'},{id:200905,name:'姓名5'}]}"
//out.clear()
out.write(jsonData)
%>
二、js处理页面
(1)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head>
<title>test</title>
<meta http-equiv="Content-Type" content="text/htmlcharset=UTF-8"/>
<script type="text/javascript" language="javascript" src="js/jquery.js"></script>
<script type="text/javascript">
function getOut(){
var s=''
$.ajax({
type:'get',//请求方式
url:'out.jsp?id='+Math.random(), // AJAX HTTP请求接口
data:'',//提交到服务器接口的参数 比如'{cid:0405}'，结果为out.jsp?cid=0405格式
dataType:'json',//请求类型为json, 更多见jquery doc文档
timeout:7000,//请求超时后停止请求
success: function(json){
var d=json.data
$.each(d,function(i){
s+=('<p>id:'+d[i].id +' | name:'+d[i].name+'</p><hr/>')
})
$('#out').html(s)}})
}
</script>
</head>
<body style="margin:20pxtext-align:centerbackground:#E5E5E5">
<input type="text" name="getdata" onclick="getOut()"/>
<div id="out">
</div>
</body>
</html>
(2)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<%@ page language="java" contentType="text/htmlcharset=utf-8"%>
<head>
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script>
function showStudent(){
var s=''
$.getJSON("out.jsp?id="+Math.random(),function(json){
var d=json.data
for(var i=0i<d.lengthi++){
s+=('<p>id:'+d[i].id +' | name:'+d[i].name+'</p><hr/>')
}
$('#content').html(s)
})
}
</script>
</head>
<body>
<input type="button" value="获取学院信息" onclick="showStudent()" />
<div id="content"></div>
</body>
</html>
总结：
（1）有时候总是出现错误，原因在于——json数据格式有问题，前端$.getJSON()方法并没有什么错误。
（2）相对来说，$ajax(option)方法使用比较灵活，可以用在比较复杂的情况。
var json = { contry:{ area:{ man:"12万", women:"10万" } } }//方式一：使用eval解析
var obj = eval(json)
alert(obj.constructor)
alert(obj.contry.area.women)
//方式二：使用Funtion函数
var strJSON = "{name:'json name'}"//得到的JSON
var obj = new Function("return" + strJSON)()//转换后的JSON对象
alert(obj.name)//json name
alert(obj.constructor)
//复杂一点的json数组数据的解析
var value1 = [{"c01":"1","c02":"2","c03":"3","c04":"4","c05":"5","c06":"6","c07":"7","c08":"8","c09":"9"}, {"c01":"2","c02":"4","c03":"5","c04":"2","c05":"8","c06":"11","c07":"21","c08":"1","c09":"12"}, {"c01":"5","c02":"1","c03":"4","c04":"11","c05":"9","c06":"8","c07":"1","c08":"8","c09":"2"}] var obj1 = eval(value1)
alert(obj1[0].c01)
//复杂一点的json的另一种形式
var value2 = {"list":[ {"password":"1230","username":"coolcooldool"}, {"password":"thisis2","username":"okokok"}], "array":[{"password":"1230","username":"coolcooldool"},{"password":"thisis2","username":"okokok"}]}
var obj2 = eval(value2)
alert(obj2.list[0].password)
