会话跟踪机制 Session

来源：互联网发布：极光推送php demo 编辑：程序博客网时间：2024/05/22 05:01

package com.oracle.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//获得用户名和密码String userName=request.getParameter("userName");String password=request.getParameter("password");if(userName.equals(password)){//将用户名和密码保存在session中HttpSession session=request.getSession();session.setAttribute("userName", userName);session.setAttribute("password", password);//超时时间为30秒//session.setMaxInactiveInterval(30);Cookie c=new Cookie("username",userName);//写在文件夹下c.setMaxAge(90*24*60*60);response.addCookie(c);response.sendRedirect("listmail.html");}else{response.sendRedirect("first.html");}}}

package com.oracle.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class MailServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//判断用户是否登录，如没登陆，重定向到登陆页HttpSession session=request.getSession();Cookie[] cc=request.getCookies();for(Cookie c:cc){System.out.println(c.getName()+":"+c.getValue());if(c.getName().equals("userName")){System.out.println("用户名是："+c.getName());}}System.out.println(session.getId());String name=(String)session.getAttribute("userName");if(name!=null){response.setContentType("text/html;charset=UTF-8");PrintWriter out = response.getWriter();out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");out.println("<HTML>");out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");out.println("  <BODY>");String flag=request.getParameter("flag");if(flag.equals("1")){out.println(name+"发送邮件成功");}else if(flag.equals("2")){out.println(name+"删除了邮件");}else if(flag.equals("3")){out.println(name+"有n封未读邮件");}else{session.invalidate();out.println("用户已注销");}out.println("</BODY>");out.println("</HTML>");out.flush();out.close();}else{response.sendRedirect("first.html");}}}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>MyHtml.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>    <body>    This is my HTML page. <br><form method="post" action="login">userName:<input type="text" name="userName"/><br/>password:<input type="text" name="password"/><br/><input type="submit" value="登陆"/></form>  </body></html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>listmail.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>    <body>    This is my beatiful page. <br>    <ul>    <li><a href="mail?flag=1">发送邮件</a></li>    <li><a href="mail?flag=2">删除邮件</a></li>    <li><a href="mail?flag=3">查找邮件</a></li>       <li><a href="mail?flag=4">注销用户</a></li>    </ul>  </body></html>

 <servlet-mapping>    <servlet-name>LoginServlet</servlet-name>    <url-pattern>/login</url-pattern>  </servlet-mapping>  <servlet-mapping>    <servlet-name>MailServlet</servlet-name>    <url-pattern>/mail</url-pattern>  </servlet-mapping>

阅读全文

0 0