AJAX读取json数据

1、创建一个json.txt文件

{  
"programmers": [  
{ "firstName": "Brett","lastName":"McLaughlin","email": "brett@newInstance.com" },{ "firstName": "Jason","lastName":"Hunter","email": "jason@servlets.com" },{ "firstName": "Elliotte","lastName":"Harold","email": "elharo@macfaq.com" }  
],"authors": [  
{ "firstName": "Isaac","lastName": "Asimov","genre": "science fiction" },{ "firstName": "Tad","lastName": "Williams","genre": "fantasy" },{ "firstName": "Frank","lastName": "Peretti","genre": "christian fiction" }  
],"musicians": [  
{ "firstName": "Eric","lastName": "Clapton","instrument": "guitar" },{ "firstName": "Sergei","lastName": "Rachmaninoff","instrument": "piano" }  
]  
}

2、jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <script type="text/javascript">
   var xmlHttp=null;
   //创建xmlhttprequest对象 
  if(window.XMLHttpRequest){
  	xmlHttp=new XMLHttpRequest();
  }else{
  	xmlHttp=new ActiveObject("Microsoft.XMLHTTP");
  }
  function myclick(){
  	try{
  		xmlHttp.onreadystatechange=handleStateChange;
  		xmlHttp.open("get","json.txt",true);
  		xmlHttp.send();
  	}
  	catch(exception){
  		alert("xmlHttp fail");
  	}
  }
  function handleStateChange(){
  	if(xmlHttp.readyState==4 && xmlHttp.status==200){
  		var result=xmlHttp.responseText;
  		var json=eval("("+result+")");
  		alert(json.programmers[0].firstName);
  	}
  }
  
  
  </script>
  </head>
  
  <body>
  <div>
  	<input type="button" value="AjaxTest" onclick="myclick()"/>
  </div>
  </body>
</html>

原文链接：https://www.f2er.com/ajax/165610.html

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