33、Cookie的简单使用
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2024-03-20 14:46:52
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新建一个Servlet
CookieServlet.java
package com.atguigu.login.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CookieServlet
*/
public class CookieServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//演示Cookie
Cookie cookie = new Cookie("username", "Admin") ;
//保存到浏览器端
response.addCookie(cookie) ;
//cookie的默认时效 就是当前浏览器的内存
//设置cookie的保存时间
//cookie.setMaxAge()
//设置cookied的路径
//cookie.setPath(uri);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
修改index.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>My First Jsp Page</title>
<style type="text/css">
#d1{
width:200px;
height:200px;
background-color:red ;
}
</style>
<script type="text/javascript" src="scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
//定义函数
function clickButton(){
//window.alert("是谁在点我.....");
var spanEle = window.document.getElementById("s1") ;
var msg = spanEle.innerHTML ;
spanEle.innerHTML = "拼搏到无能为力，努力到不能自己" ;
document.getElementById("i1").value=msg ;
// alert(msg) ;
}
function mouseOver(){
alert("鼠标进来了。。。。。");
}
function mouseOut(){
alert("鼠标离开了。。。。");
}
$(function(){ //相当于window.onload();
// alert("文档加载完毕了")
// $("#d2") 就相当于 document.getElementById("d2");
$("#d2").click(function(){
var msg = $("#s1").html();
// alert(msg) ;
$("#i1").val(msg) ;
//Jquery --> Dom
var Jobj = $("#s1") ;
var dObj = Job[0] ; // Job.get(0)
// Dom -->JQuery
var JJobj = $(dObj) ;
});
});
</script>
</head>
<body>
<h1 align="center">我是HTML代码</h1>
<!--
java代码
java片段
表达式
-->
<!-- java片段 -->
<%
String str = "Abc" ;
System.out.println("Abc") ;
%>
<!-- 表达式 -->
<%=5>3?"大于":"小于"%>
<!-- jsp页面执行原理:
JSP本质上就是一个Servlet.执行的时候会先在转化成一个.java文件，再编译成.class文件
如何转化：
java代码片段照搬
html、css、js、表达式，通过输出流out.weiter()方法往出写。
作用：
1.可以自动的将html相关的代码通过流写在浏览器端
2.支持写java代码，可以灵活的做出一些处理
-->
<!-- EL表达式的常用 -->
<br/>
${1+1}
<br/>
${2>3 }
<br/>
${empty a }
<br/>
<input type="button" value="点我呀" onclick="clickButton();"/>
<div id="d1" onmouseover="mouseOver();" onmouseout="mouseOut();"></div>
<span id="s1">复杂的事情简单做，简单的事情重复做</span>
<br/>
<input id="i1" type="text" name="msg" />
<input type="button" id="d2" value="测试Jquery" />
<br/>
<a href="CookieServlet">Test Cookie</a>
</body>
</html>
新建一个Servlet
GetCookieServlet.java
package com.atguigu.login.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class GetCookieServlet
*/
public class GetCookieServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取cookie
Cookie [] cookies = request.getCookies() ;
if(cookies!=null){
for (Cookie cookie : cookies){
System.out.println(cookie.getName() + " : " + cookie.getValue());
}
}else {
System.out.println("沒有Cookie");
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}
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