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Json引入键值key&value,数组,嵌套

2024-09-02 05:44:05   219人阅读

Ajax&Json

JSP页面

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test Ajax&Json</title>
<script type="text/javascript">
function loadJson() {
	var xmlHttp;
	if(window.XMLHttpRequest){
		xmlHttp=new XMLHttpRequest();
	}else{//IE 5,6的支持
		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlHttp.onreadystatechange=function(){
		if(xmlHttp.readyState==4 && xmlHttp.status==200){
			var dataObj=eval("("+xmlHttp.responseText+")");
			document.getElementById("name").value=http://www.mamicode.com/dataObj.name;"age").value=http://www.mamicode.com/dataObj.age;"post", "testJson?action=jsonObject", true);
	xmlHttp.send();
}

function loadJson2() {
	var xmlHttp;
	if(window.XMLHttpRequest){
		xmlHttp=new XMLHttpRequest();
	}else{//IE 5,6的支持
		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlHttp.onreadystatechange=function(){
		if(xmlHttp.readyState==4 && xmlHttp.status==200){
			alert(xmlHttp.responseText);
			var dataObj=eval("("+xmlHttp.responseText+")");
			var em=document.getElementById("emp");
			var newTr;
			var newTd0;
			var newTd1;
			for(var i=0;i<dataObj.emp.length;i++){
				var emp=dataObj.emp[i];
				newTr=em.insertRow();
				newTd0=newTr.insertCell();
				newTd1=newTr.insertCell();
				newTd0.innerHTML=emp.name;
				newTd1.innerHTML=emp.job;
			}
		}
	};
	xmlHttp.open("get", "testJson?action=jsonArray", true);
	xmlHttp.send();
}
</script>
</head>
<body>

<div>
<button onclick="loadJson()">测试Json</button>
姓名：<input type="text" name="name" id="name">
年龄：<input type="text" name="age" id="age">
</div>
<br><br>
<div>
<button onclick="loadJson2()">测试Json2</button>
<table id="emp">
	<tr>
		<th>姓名</th>
		<th>年龄</th>
	</tr>
</table>
</div>
</body>
</html>

　　请求的Servlet代码

	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setContentType("text/html;charset=utf-8");
		String action=req.getParameter("action");
		if("jsonObject".equals(action)){
			getJSONObject(req,resp);
		}else if("jsonArray".equals(action)){
			getJSONArray(req,resp);
		}
	}
	
	private void getJSONObject(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		PrintWriter out =resp.getWriter();
		//String str="{\"name\":\"Anner\",\"age\":24}";
		JSONObject j=new JSONObject();
		j.put("name", "Anner");
		j.put("age", 26);
		out.println(j);
		out.flush();
		out.close();
	}
	private void getJSONArray(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		PrintWriter out =resp.getWriter();
		
		JSONArray js=new JSONArray();
		JSONObject j1=new JSONObject();
		j1.put("name", "Allen");j1.put("job", "办事员");
		JSONObject j2=new JSONObject();
		j2.put("name", "Smith");j2.put("job", "销售员");
		JSONObject j3=new JSONObject();
		j3.put("name", "James");j3.put("job", "技术员");
		js.add(j1);js.add(j2);js.add(j3);
		
		JSONObject resultJson=new JSONObject();
		resultJson.put("emp", js);
		
		out.println(resultJson);
		out.flush();
		out.close();
	}

技术分享

　　Json可以进行无线嵌套，

　　嵌套示例：

 

Json引入键值key&value,数组,嵌套


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