33、Cookie的简单使用

最新推荐文章于 2025-03-24 11:14:13 发布

班德尔第一小法

最新推荐文章于 2025-03-24 11:14:13 发布

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分类专栏： Java-Web

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在这里插入图片描述
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 {
		
	}

}