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‎.idea/artifacts/vehicle_rent_war.xml‎

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‎.idea/artifacts/vehicle_rent_war_exploded.xml‎

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‎.idea/compiler.xml‎

Lines changed: 4 additions & 2 deletions
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‎.idea/encodings.xml‎

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‎.idea/libraries/vehicle_rent_lib.xml‎

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‎.idea/libraries/vehicle_rent_lib__2_.xml‎

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‎.idea/misc.xml‎

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‎.idea/modules.xml‎

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‎_13_cookie_session/src/main/java/com/atguigu/servlet/CookieServlet.java‎

Lines changed: 122 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,7 @@
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package com.atguigu.servlet;
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import com.atguigu.util.CookieUtils;
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import javax.servlet.ServletException;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServletRequest;
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public class CookieServlet extends BaseServlet {
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/**存活一小时的cookie
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void life3600(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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Cookie cookie=new Cookie("life3600","life3600");
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cookie.setMaxAge(60*60);
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resp.addCookie(cookie);
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resp.getWriter().write("存活一小时的cookie");
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}
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/** 退出浏览器,就被删除的cookie(默认 会话级别的cookie)
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void defaultLife(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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Cookie cookie=new Cookie("defaultLife","defaultLife");
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cookie.setMaxAge(-1);
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resp.addCookie(cookie);
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}
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/** 立即删除指定cookie
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void deleteNow(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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//1.先找到要删除的 cookie
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Cookie cookie=CookieUtils.findCookie("key3",req.getCookies());
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if(cookie!=null){
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//2.调用 setMaxAge(0)
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cookie.setMaxAge(0);
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}
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//3.调用 addCookie()
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resp.addCookie(cookie);
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resp.getWriter().write("key3的cookie已经被删除");
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}
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/** 更新cookie的value
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void updateCookie(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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// //1.方案一: 创建 一个新的 同名 Cookie , 覆盖 旧的就行了
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// Cookie cookies=new Cookie("key1","newValue1");
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// resp.addCookie(cookies);
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// resp.getWriter().write("key1的Cookie修改好了");
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//2.先找到需要的Cookie ,再修改
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Cookie cookie=CookieUtils.findCookie("key2",req.getCookies());
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if(cookie!=null){
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cookie.setValue("newValue2");
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}
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//通知客户端保存 cookie
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resp.addCookie(cookie);
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}
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/** 客户端 获取 服务器 Cookie的方法
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* 先获取所有cookie,再遍历查找自己需要的
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void getCookie(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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Cookie[] cookies = req.getCookies();
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for (Cookie cookie : cookies) {
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resp.getWriter().write("Cookie[" + cookie.getName() + "=" + cookie.getValue() + "]<br/>");
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}
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Cookie iWantCookie= CookieUtils.findCookie("key2",cookies);//左参数 为查找目标,右参数为 所有cookie的集合
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// for (Cookie cookie : cookies) {
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// if("key2".equals(cookie.getName())){
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// iWantCookie=cookie;
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// break;
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// }
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// }
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if(iWantCookie!=null){
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resp.getWriter().write("找到了需要的Cookie");
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}
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}
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/** 创建cookie
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void createCookie(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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//1.创建cookie对象
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Cookie cookie=new Cookie("key1","value1");
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Cookie cookie1 = new Cookie("key1", "value1");
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//2.通知客户端 保存cookie对象
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resp.addCookie(cookie);
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resp.addCookie(cookie1);
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//1.创建cookie对象
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Cookie cookie2 = new Cookie("key2", "value2");
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//2.通知客户端 保存cookie对象
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resp.addCookie(cookie2);
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//1.创建cookie对象
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Cookie cookie3 = new Cookie("key3", "value3");
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//2.通知客户端 保存cookie对象
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resp.addCookie(cookie3);
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resp.getWriter().write("Cookie对象创建成功");
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}
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}

‎_13_cookie_session/src/main/java/com/atguigu/util/CookieUtils.java‎

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Original file line numberDiff line numberDiff line change
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package com.atguigu.util;
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import javax.servlet.http.Cookie;
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public class CookieUtils {
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/**
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*
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* @param name 想查找的cookie名字
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* @param cookies 所有cookie组成的集合 , 一般用req.getCookies()找到所有cookie
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* @return
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*/
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public static Cookie findCookie(String name,Cookie[] cookies){
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if(name==null||cookies==null||cookies.length==0 ){
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return null;
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}
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for (Cookie cookie : cookies) {
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if(name.equals(cookie.getName())){
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return cookie;
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}
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}
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return null;
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}
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}

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