欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识！
您现在的位置是： 首页

Ajax简介

程序员文章站 2022-03-09 14:55:31
...
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
相关标签： ajax

上一篇： [前端]关于使用ajax下载问题

下一篇： Ajax核心知识

推荐阅读