<%@ 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>登录</title> </head> <body> 登录页面<br> <% //销毁session session.invalidate();%> <form action="testPW.jsp" method="post"> 用户名：<input type="text" name="username"/> 密码：<input type="password" name="password"/> <input type="submit" value="登录"/></form> </body> </html>
<%@ 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>Insert title here</title> </head> <body> <% //验证 用户登录信息是否正确 String un= request.getParameter("username"); String pw= request.getParameter("password"); if (un!=""&&pw!="") { //如果正确，就创建session，并跳转到main.jsp if(un.equals("tom")&&pw.equals("123")) { session.setAttribute("username", un); //跳转到系统主页面 response.sendRedirect("Main.jsp"); } else { //否则提示登陆错误 out.print("用户名或密码错误"); } } else { out.print("请以正确的方式登录"); } //%> </body> </html>
<%@ 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>Insert title here</title> </head> <body> <% //检查session,取得session信息 Object obj=session.getAttribute("username"); if(obj!=null) { out.print("欢迎登陆"); } else { out.print("会话超时，请重新登录系统"); response.setHeader("refResh", "3;URL=Login.jsp"); }%> 主页面 <br> <a href="Login.jsp">退出登录</a> </body> </html>
