2. Ajax 核心知识

<%@ 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>Insert title here</title>
<script type="text/javascript">
	function loadName(){
		var xmlHttp;
		if(window.XMLHttpRequest){
			xmlHttp=new XMLHttpRequest();
		}else{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		alert("readState状态："+xmlHttp.readyState+";status状态："+xmlHttp.status);
		xmlHttp.onreadystatechange=function(){
			alert("readState状态："+xmlHttp.readyState+";status状态："+xmlHttp.status);
			if(xmlHttp.readyState==4 && xmlHttp.status==200){
				alert(xmlHttp.responseText);
				document.getElementById("name").value=xmlHttp.responseText;
			}
		};
		// xmlHttp.open("get","getAjaxName?name=jack&age=11",true);
		// xmlHttp.open("post",true);
		// xmlHttp.send();
		
	    xmlHttp.open("post","getAjaxName",true);
	    xmlHttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
	    xmlHttp.send("name=jack&age=11");
	}
</script>
</head>
<body>
<div style="text-align: center;">
	<div><input type="button" onclick="loadName()" value="Ajax获取数据"/>&nbsp;&nbsp;<input type="text" id="name" name="name" /></div>
</div>
</body>
</html>

package com.java1234.web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.servletexception;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetAjaxNameServlet extends HttpServlet{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest request,HttpServletResponse response)
			throws servletexception,IOException {
		this.doPost(request,response);
	}

	@Override
	protected void doPost(HttpServletRequest request,IOException {
		String name=request.getParameter("name");
		String age=request.getParameter("age");
		System.out.println("name="+name);
		System.out.println("age="+age);
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.println("ajax返回的文本");
		out.flush();
		out.close();
	}

	
	
}

原文地址：https://www.jb51.cc/ajax/162067.html

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