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用户在login.jsp页面输入用户名密码登录：
如果用户名为xingoo，密码为123，则跳转到成功界面login_success.jsp，并显示用户登录的名字；
如果用户名密码错误，则跳转到失败界面login_failure.jsp，并提示返回登录界面。
<%@ 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>用户登录</title> </head> <body> <h1>用户登录</h1> <hr> <form name="regForm" action="doLogin.jsp" method="post"> <table> <tr> <td>username</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>password</td> <td><input type="password" name="password"/></td> </tr> <tr> <td colspan="2"><input type="submit" value="submit"/></td> </tr> </table> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <% String username = ""; String password = ""; request.setCharacterEncoding("utf-8"); username = request.getParameter("username"); password = request.getParameter("password"); if("xingoo".equals(username)&&"123".equals(password)){ session.setAttribute("loginUser",username); request.getRequestDispatcher("login_success.jsp").forward(request,response); }else{ response.sendRedirect("login_failure.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>用户登录</title> </head> <body> <h1>用户登录</h1> <hr> 欢迎您!<%=session.getAttribute("loginUser") %> </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>用户登录</title> </head> <body> <h1>用户登录</h1> <hr> 登录失败!<a href="login.jsp">返回登录</a> </body> </html>
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原文地址：http://www.cnblogs.com/xing901022/p/4356135.html
