jsp 实现登录
login.jsp<%@ page contentType="text/html;charset=GB2312"%><html><center><form method=post action="login_act.jsp">username<input type=text name=username><br><br>password<input type=password name=password><br><br><input type=submit value="登录"></form></center></html>
login_act.jsp
<%@ page contentType="text/html;charset=GB2312"%><% if(request.getParameter("username").equals("skysky")&&request.getParameter("password").equals("skysky")){ session.setAttribute("login",request.getParameter("username")); session.setMaxInactiveInterval(-1);%><jsp:forward page="login_success.jsp"/><% }else{ out.println("<script>alert('用户名或密码输入错误');</script>网页将在3s调整");out.println("<meta http-equiv='refresh' content='1;url=login.jsp'>"); //response.sendRedirect("login.jsp");}%>
login_success.jsp
<%@ page contentType="text/html;charset=GB2312"%><html> <head> <title>~WELCOME TO MY HOMEPAGE~</title> </head> <body> <center> ~WELCOME TO MY HOMEPAGE~ 成功登录<br><br><%= session.getAttribute("login")%>&nbsp;&nbsp;&nbsp;&nbsp;<a href="logout.jsp">退出</a> </center> </body></html><% if(session.getAttribute("login")==null||!session.getAttribute("login").equals("skysky")){ response.sendRedirect("login.jsp");}%>
logout.jsp
<% session.invalidate(); response.sendRedirect("login_success.jsp");%>
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