使用JSP实现简单的用户登录注册页面示例代码解析
实验要求：
将实验2中的系统用户登录和注册页面改为JSP页面，并部署自己的Web应用于Tomcat服务器中
具体要求：
完成登录JSP页面设计和注册页面设计
在登录页面表单中使用request对象获取用户信息，建立新的JSP页面完成登录验证（用户名和密码自己指定即可）。
验证结果显示（如登录成功/用户名密码错误，可以使用JavaScript，也可以使用新的JSP页面）。
在注册页面表单中使用request对象获取用户注册信息（注册项目由自己指定），在新的JSP页面显示用户注册信息，并提示注册成功。
代码
登录页面index.html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>jsp作业</title>
<link href="css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet">
</head>
<body>
<nav>
<div>
<div>
<a href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jsp作业</a>
</div>
<div id="bs-example-navbar-collapse-1">
<ul>
<li><a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a></li>
</ul>
</div>
</div>
</nav>
<div>
<div>
<h1>Hello, world!</h1>
<p>这是一个jsp作业</p>
</div>
</div>
</body>
</html>
登录页面login.jsp
<%@ page contentType="text/html; charset=utf-8" language="java"%>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>登录</title>
<link href="css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet">
</head>
<body>
<nav>
<div>
<div>
<a href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jsp作业</a>
</div>
<div id="bs-example-navbar-collapse-1">
<ul>
<li><a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a></li>
</ul>
</div>
</div>
</nav>
<div>
<div>
<div>
</div>
<div>
<form method="post" action="login-check.jsp">
<h2>登录到jsp作业</h2>
<label for="">用户名</label>
<input type="text" name="username" id="username" placeholder="请输入用户名" required autofocus><br>
<label for="">密码</label>
<input type="password" name="password" id="password" placeholder="请输入密码" required>
<div>
<label>
<input type="checkbox" value="remember-me" checked="checked"> 记住密码
</label>
</div>
<button type="submit" id="btn-login">登录</button>
<a href="reg.jsp" rel="external nofollow" rel="external nofollow">注册</a>
</form>
</div>
<div>
</div>
</div>
</body>
</html>
登录结果页面login-check.jsp
<%@ page contentType="text/html; charset=utf-8" language="java"%>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>登录</title>
<link href="css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet">
</head>
<body>
<nav>
<div>
<div>
<a href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jsp作业</a>
</div>
<div id="bs-example-navbar-collapse-1">
<ul>
<li><a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a></li>
</ul>
</div>
</div>
</nav>
<div>
<div>
<div>
</div>
<div>
<form method="post" action="login-check.jsp">
<h2>登录到jsp作业</h2>
<label for="">用户名</label>
<input type="text" name="username" id="username" placeholder="请输入用户名" required autofocus><br>
<label for="">密码</label>
<input type="password" name="password" id="password" placeholder="请输入密码" required>
<div>
<label>
<input type="checkbox" value="remember-me" checked="checked"> 记住密码
</label>
</div>
<button type="submit" id="btn-login">登录</button>
<a href="reg.jsp" rel="external nofollow" rel="external nofollow">注册</a>
</form>
</div>
<div>
</div>
</div>
</body>
</html>
注册页面reg.jsp
<%@ page contentType="text/html; charset=utf-8" language="java"%>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>注册</title>
<link href="css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet">
</head>
<body>
<nav>
<div>
<div>
<a href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jsp作业</a>
</div>
<div id="bs-example-navbar-collapse-1">
<ul>
<li><a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a></li>
</ul>
</div>
</div>
</nav>
<div>
<div>
<div>
</div>
<div>
<form action="reg-submit.jsp" method="post">
<h2>注册到jsp作业</h2>
<div id="info">
</div>
<label for="">用户名</label>
<input type="text" name="username" id="username" placeholder="请输入用户名" required autofocus><br>
<label for="">密码</label>
<input type="password" name="password" id="password" placeholder="请输入密码" required><br>
<label for="">重复密码</label>
<input type="password" name="password2" id="password2" placeholder="请再次输入密码" required maxLength="16"><br>
<button type="submit" id="btn-reg">注册</button>
<a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="btn-reg">返回登录</a>
</form>
</div>
<div>
</div>
</div>
</body>
</html>
注册结果页面reg-submit.jsp
<%@ page contentType="text/html; charset=utf-8" language="java"%>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>结果</title>
<link href="css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="stylesheet">
</head>
<body>
<nav>
<div>
<div>
<a href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jsp作业</a>
</div>
<div id="bs-example-navbar-collapse-1">
<ul>
<li><a href="login.jsp" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a></li>
</ul>
</div>
</div>
</nav>
<div>
<% String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
%>
<%
if(password.equals(password2)){
out.println("<div class="alert alert-success" role="alert">注册成功</div>");
out.println("<ul class="list-group">");
out.println("<li class="list-group-item">用户名：" + username + "</li>");
out.println("<li class="list-group-item">密码：" + password + "</li>");
out.println("</ul>");
}
else{
out.println("<div class="alert alert-danger" role="alert">两次密码输入不一致，请重新输入</div>");
}
%>
<!-- <%=username %>
<%=password %>
<%=password2 %> -->
</div>
效果
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