JavaWeb-利用Session登录成功后跳转

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>登录页面</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
	<form action="/WebTask/Task/Task07/login-action.jsp" method="post">
		用户名<input name="username">(只能由字母组成,3~12位) <br>密码<input
			type="password" name="password">(6~12位)<br> <input
			type="submit"  value="登录">

	</form>
	<!-获取值,有就输出,没有就为空 --->
	${requestScope["kong"] }${requestScope["YWLJ"] } ${requestScope["BPP"] }



</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ page import="java.io.*,java.util.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>业务逻辑判断</title>
</head>
<body>



	<%
		//判断是否为空
		if (request.getParameter("username").equals("")
				&& request.getParameter("password").equals("")) {
			//为空就将请求转发到登录页面报错
			request.setAttribute("kong", "您输入的内容为空");
			request.getRequestDispatcher("/Task/Task07/login.jsp").forward(
					request, response);
		} else {
			//不是空就创建
			String username = request.getParameter("username");
			String password = request.getParameter("password");
			//判断用户名密码是否符合业务逻辑
			if (username.matches("[a-zA-Z]{3,12}")
					&& password.matches("[a-zA-Z0-9]{6,12}")) {

				//判断用户名密码是否正确,正确就跳转到欢迎页面
				if (username.equals("tom") && password.equals("123456")) {
					out.print("welcome!" + username);
					//使用一个指定的名称绑定一个对象到session会话,request也有此方法
					session.setAttribute("username", username);
					//跳转到欢迎页面
					response.sendRedirect("/WebTask/index.jsp");
				} else {
					//用户名密码不正确时
					request.setAttribute("BPP", "您输入的用户名密码不匹配");
					request.getRequestDispatcher("/Task/Task07/login.jsp")
							.forward(request, response);
				}
			} else {
				//不符合业务逻辑时
				request.setAttribute("YWLJ", "请按要求输入用户名和密码");
				request.getRequestDispatcher("/Task/Task07/login.jsp")
						.forward(request, response);

			}
		}
	%>


</body>
</html>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<%!int fontSize = 0;%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>欢迎页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
</head>

<body>
	现在的时间是:
	<%=(new java.util.Date()).toLocaleString()%><br>
	<%
		out.print("<h1>Welcome!" + session.getAttribute("username")+"</h1>");
	%>
</body>
</html>

演示

JavaWeb-利用Session登录成功后跳转

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