\黑马程序员_超全面的JavaWeb视频教程vedio\黑马程序员_超全面的JavaWeb教程-源码笔记\JavaWeb视频教程_day23-资料源码\ajax_code\day23_3
本代码中有模拟 jquery里面的对Ajax的简化封装：
json2.jsp Ajax原生请求
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘json2.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function createXMLHttpRequest() {
try {
return new XMLHttpRequest();//大多数浏览器
} catch (e) {
try {
return ActvieXObject("Msxml2.XMLHTTP");//IE6.0
} catch (e) {
try {
return ActvieXObject("Microsoft.XMLHTTP");//IE5.5及更早版本
} catch (e) {
alert("哥们儿，您用的是什么浏览器啊？");
throw e;
}
}
}
}
window.onload = function() {
// 获取btn元素
var btn = document.getElementById("btn");
btn.onclick = function() {//给按钮的点击事件上添加监听
// 使用ajax得到服务器端响应，把结果显示到h3中
//1. 得到request
var xmlHttp = createXMLHttpRequest();
//2. 连接
xmlHttp.open("GET", "<c:url value=‘/AServlet‘/>", true);
//3. 发送
xmlHttp.send(null);
//4. 给xmlHttp的状态改变事件上添加监听
xmlHttp.onreadystatechange = function() {
//双重判断
if(xmlHttp.readyState == 4 && xmlHttp.status == 200) {
var text = xmlHttp.responseText;//它是一个json串
// 执行json串
var person = eval("(" + text + ")");
var s = person.name + ", " + person.age + ", " + person.sex;
document.getElementById("h3").innerHTML = s;
}
};
};
};
</script>
</head>
<body>
<%-- 点击按钮后，把服务器响应的数据显示到h3元素中 --%>
<button id="btn">点击这里</button>
<h1>JSON之Hello World</h1>
<h3 id="h3"></h3>
</body>
</html>
package cn.itcast.demo1;
import java.util.ArrayList;
import java.util.List;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.junit.Test;
/**
* 演示JSON-LIB小工具
* @author cxf
*
*/
public class Demo1 {
/*
* 当map来用
*/
@Test
public void fun1() {
JSONObject map = new JSONObject();
map.put("name", "zhangSan");
map.put("age", 23);
map.put("sex", "male");
String s = map.toString();
System.out.println(s);
}
/*
* 当你已经有一个Person对象时，可以把Person转换成JSONObject对象
*/
@Test
public void fun2() {
Person p = new Person("liSi", 32, "female");
// 把对象转换成JSONObject类型
JSONObject map = JSONObject.fromObject(p);
System.out.println(map.toString());
}
/**
* JSONArray
*/
@Test
public void fun3() {
Person p1 = new Person("zhangSan", 23, "male");
Person p2 = new Person("liSi", 32, "female");
JSONArray list = new JSONArray();
list.add(p1);
list.add(p2);
System.out.println(list.toString());
}
/**
* 原来就有一个List，我们需要把List转换成JSONArray
*/
@Test
public void fun4() {
Person p1 = new Person("zhangSan", 23, "male");
Person p2 = new Person("liSi", 32, "female");
List<Person> list = new ArrayList<Person>();
list.add(p1);
list.add(p2);
System.out.println(JSONArray.fromObject(list).toString());
}
}
// 创建request对象
function createXMLHttpRequest() {
try {
return new XMLHttpRequest();//大多数浏览器
} catch (e) {
try {
return ActvieXObject("Msxml2.XMLHTTP");//IE6.0
} catch (e) {
try {
return ActvieXObject("Microsoft.XMLHTTP");//IE5.5及更早版本
} catch (e) {
alert("哥们儿，您用的是什么浏览器啊？");
throw e;
}
}
}
}
/*
* option对象有如下属性
*/
/*请求方式*/method,
/*请求的url*/ url,
/*是否异步*/asyn,
/*请求体*/params,
/*回调方法*/callback,
/*服务器响应数据转换成什么类型*/type
function ajax(option) {
/*
* 1. 得到xmlHttp
*/
var xmlHttp = createXMLHttpRequest();
/*
* 2. 打开连接
*/
if(!option.method) {//默认为GET请求
option.method = "GET";
}
if(option.asyn == undefined) {//默认为异步处理
option.asyn = true;
}
xmlHttp.open(option.method, option.url, option.asyn);
/*
* 3. 判断是否为POST
*/
if("POST" == option.method) {
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
}
/*
* 4. 发送请求
*/
xmlHttp.send(option.params);
/*
* 5. 注册监听
*/
xmlHttp.onreadystatechange = function() {
if(xmlHttp.readyState == 4 && xmlHttp.status == 200) {//双重判断
var data;
// 获取服务器的响应数据，进行转换！
if(!option.type) {//如果type没有赋值，那么默认为文本
data = xmlHttp.responseText;
} else if(option.type == "xml") {
data = xmlHttp.responseXML;
} else if(option.type == "text") {
data = xmlHttp.responseText;
} else if(option.type == "json") {
var text = xmlHttp.responseText;
data = eval("(" + text + ")");
}
// 调用回调方法
option.callback(data);
}
};
};
ajaxutils.js
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘json3.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="<c:url value=‘/ajax-lib/ajaxutils.js‘/>"></script>
<script type="text/javascript">
window.onload = function() {
var btn = document.getElementById("btn");
btn.onclick = function() {
/*
1. ajax
*/
ajax(
{
url:"<c:url value=‘/AServlet‘/>",
type:"json",
callback:function(data) {
document.getElementById("h3").innerHTML = data.name + ", " + data.age + ", " + data.sex;
}
}
);
};
};
</script>
</head>
<body>
<%-- 点击按钮后，把服务器响应的数据显示到h3元素中 --%>
<button id="btn">点击这里</button>
<h1>显示自己封装的ajax小工具</h1>
<h3 id="h3"></h3>
</body>
</html>
json3.jsp 调用简化的Ajax
时间： 2024-11-10 13:29:43