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Ajax简介

程序员文章站 2022-07-15 16:03:48
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1. Ajax简介 

1.1) Ajax是一种网页开发技术，(Asynchronous Javascript + XML)异步JavaScript和XML；

1.2) Ajax是异步交互，局部刷新；

1.3) Ajax能减少服务器压力；

1.4) Ajax能提高用户体验；


2. Ajax交互与传统交互比较 

传统交互：网页整体刷新，服务器压力大，用户体验不好；
Ajax交互：局部刷新，服务器压力小，用户体验好；

web.xml

<servlet>
      <servlet-name>getNameServlet</servlet-name>
      <servlet-class>com.andrew.web.GetNameServlet</servlet-class>
</servlet>
<servlet-mapping>
      <servlet-name>getNameServlet</servlet-name>
      <url-pattern>/getName</url-pattern>
</servlet-mapping>

GetAjaxNameServlet.java

package com.andrew.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, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println("汤姆汉克斯");
        out.flush();
        out.close();
    }
}

common.jsp

<%@ 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>
<%
    Object obj = application.getAttribute("count");
    if (obj == null) {
        Integer count = 1;
        application.setAttribute("count",count);
    } else {
        Integer count = (Integer)obj;
        count++;
        application.setAttribute("count",count);
    }
%>
</head>
<link href="css/slide.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.SuperSlide.2.1.1.js"></script>
<script type="text/javascript">
    $(function(){
        $("#focus").hover(function(){$("#focus-prev,#focus-next").show();},function(){$("#focus-prev,#focus-next").hide();});
        $("#focus").slide({ 
            mainCell:"#focus-bar-box ul",
            targetCell:"#focus-title a",
            titCell:"#focus-num a",
            prevCell:"#focus-prev",
            nextCell:"#focus-next",
            effect:"left",
            easing:"easeInOutCirc",
            autoPlay:true,
            delayTime:200
        })
    })
</script>
<body>
<div style="text-align: center;">
    <div style="padding: 10px;"><input type="button" style="border: 1px solid red;" value="获取姓名" onclick="javascript:window.location='getName'"/>&nbsp;&nbsp;<input type="text" name="name" value="${name }" style="border-bottom: 1px solid red"/>&nbsp;&nbsp;页面刷新次数：<font color="red">${count }</font></div>
</div>
<div id="focus">
<div class="hd">
<div class="focus-title" id="focus-title">
    <a href="http://www.baidu.com"><span class="title">《王的女人》</span>于正版霸王别姬 陈乔恩变腹黑大战情敌袁姗姗</a>
    <a href="http://www.baidu.com"><span class="title">《盲探》</span>刘德华、郑秀文、杜琪峰香港电影铁三角十年归来</a>
    <a href="http://www.baidu.com"><span class="title">《爸爸去哪儿》</span>众星爸厨艺比拼犯难（2013-10-18期）</a>
    <a href="http://www.baidu.com"><span class="title">《到爱的距离》</span>李晨张馨予谱写爱之终曲</a>
    <a href="http://www.baidu.com"><span class="title">《天台》</span>周杰伦自导自演  传递超屌正能量</a>
</div>
    <a class="hdicon" href="http://www.baidu.com"></a>
    </div>
    <div class="focus-bar-box" id="focus-bar-box">
      <ul class="focus-bar">
        <li><a href="http://www.baidu.com"><img src="images/01.jpg"></a></li>
        <li><a href="http://www.baidu.com"><img src="images/02.jpg"></a></li>
        <li><a href="http://www.baidu.com"><img src="images/03.jpg"></a></li>
        <li><a href="http://www.baidu.com"><img src="images/04.jpg"></a></li>
        <li><a href="http://www.baidu.com"><img src="images/05.jpg"></a></li>
      </ul>
    </div>
    <a href="http://www.baidu.com" class="btn-prev" onclick="return false;" hidefocus="" id="focus-prev"></a>
    <a href="http://www.baidu.com" class="btn-next" onclick="return false;" hidefocus="" id="focus-next"></a>
    <div class="ft">
        <div class="ftbg"></div>
        <div id="focus-num" class="change">
            <a class=""></a>
            <a class=""></a>
            <a class=""></a>
            <a class=""></a>
            <a class=""></a>
        </div>
    </div>
</div>
</body>
</html>

http://localhost:8080/HeadFirstAjaxJson/getName
页面图片会从头开始
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