login.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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div>
<form action="dologin.jsp" method="post">
<span>用户名</span>
<input type="text" name="username" />
<span>密码</span>
<input type="text" name="password" />
<input type="submit" value="登录"/>
</form>
</div>
</body>
</html>
dologin.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+"/"; String username=""; String password=""; request.setCharacterEncoding("utf-8"); username=request.getParameter("username"); password=request.getParameter("password"); out.println(username); out.println(password); if("admin".equals(username) && "admin".equals(password)){ session.setAttribute("loginUsername", username); session.setAttribute("loginUser",username); request.getRequestDispatcher("login_success.jsp").forward(request,response); }else{ response.sendRedirect("login_failure.jsp"); } %>
login_success.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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div> 欢迎<h3><%=session.getAttribute("loginUsername") %></h3>,登录成功!!!! </div>
</body>
</html>
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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div> 登录失败,请检查用户名或者密码!!! <a href="login.jsp">login</a>
</div>
</body>
</html>
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原文链接:https://blog.csdn.net/sinat_36146776/article/details/60349599