cookie

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LoginService.java

package edu.cn;public class LoginService {public static boolean login(String username, String password) {           if ("admin".equals(username) && "123456".equals(password)) {               return true;           } else {               return false;           }       } }

Login.jsp登录页面：

 <body>  <%@   page   import= "edu.cn.LoginService,java.sql.*"%>    <%   //1.获取客户端的Cookie      Cookie[] cookies =request.getCookies();           String[] cooks = null;           String username = null;           String password = null;                  if (cookies!=null&&cookies.length!=0) {                      for (Cookie coo : cookies) {  //2.根据cookie的名字寻找cookie，并获取它的值。        if("user".equals(coo.getName())){        username =coo.getValue();                       }         if("pass".equals(coo.getName())){        password=coo.getValue();        }                     }           }           if (LoginService.login(username, password)) {                      session.setAttribute("username", username);            response.sendRedirect("main.jsp");                       }else{           //3.设计form表单        response.sendRedirect("MyHtml.html");         }        %>  <br>  </body>

LoginServlet.java中的核心代码

public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();//1.获取form表单传递来的数据String username=request.getParameter("username");           String password=request.getParameter("password");           String savetime=request.getParameter("time");         //2.如果输入的用户名和密码争取，则将用户名和密码设置为2个cookie,发送给客户端        if(LoginService.login(username, password)){               if(null!=savetime&&savetime.length()>0){                   int saveTime=Integer.parseInt(savetime);                int seconds=saveTime*24*60*60;              //3.创建2个cookie，名字分别为user和password，并为它们设置相关内容                Cookie cookie =new Cookie("user",username);                   cookie.setMaxAge(seconds);                 cookie.setPath("/");                Cookie cookie2=new Cookie("pass",password);                cookie2.setMaxAge(seconds);                 cookie2.setPath("/");          //4.添加cookie,发送给客户端                response.addCookie(cookie);                 response.addCookie(cookie2);            }                                  request.getRequestDispatcher("/main.jsp").forward(request,response);           }else{               request.getRequestDispatcher("/index.jsp").forward(request,response);           }   }}

main.jsp页面

  <body>    登录成功，欢迎${username}的到来  </body>

index.jsp页面

  <body>   <a href="Login.jsp"> 登陆</a>  </body>