使用JSP实现简单的用户登录注册页面示例代码解析

JSP教程 • 2025-08-01

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"
 titlejsp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 class="navbar navbar-default"
 div class="container-fluid"
  div class="navbar-header"
   a class="navbar-brand" href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" jsp作业/a
  /div
  div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"
   ul class="nav navbar-nav navbar-right"
    lia 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 class="container"
 div class="jumbotron"
  h1Hello, 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 class="navbar navbar-default"
 div class="container-fluid"
  div class="navbar-header"
   a class="navbar-brand" href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" jsp作业/a
  /div
  div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"
   ul class="nav navbar-nav navbar-right"
    lia 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 class="container"
 div class="row"
  div class="col-md-4"

  /div
  div class="col-md-4"
   form class="form-signin" method="post" action="login-check.jsp"
    h2 class="form-signin-heading"登录到jsp作业/h2
    label for=""用户名/label
    input type="text" name="username" id="username" class="form-control" placeholder="请输入用户名" required autofocusbr
    label for=""密码/label
    input type="password" name="password" id="password" class="form-control" placeholder="请输入密码" required
    div class="checkbox"
     label
      input type="checkbox" value="remember-me" checked="checked" 记住密码
     /label
    /div
    button type="submit" class="btn btn-primary" id="btn-login"登录/button
    a href="reg.jsp" rel="external nofollow" rel="external nofollow" class="btn btn-default"注册/a
   /form
  /div
  div class="col-md-4"
  /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 class="navbar navbar-default"
 div class="container-fluid"
  div class="navbar-header"
   a class="navbar-brand" href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" jsp作业/a
  /div
  div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"
   ul class="nav navbar-nav navbar-right"
    lia 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 class="container"
 div class="row"
  div class="col-md-4"

  /div
  div class="col-md-4"
   form class="form-signin" method="post" action="login-check.jsp"
    h2 class="form-signin-heading"登录到jsp作业/h2
    label for=""用户名/label
    input type="text" name="username" id="username" class="form-control" placeholder="请输入用户名" required autofocusbr
    label for=""密码/label
    input type="password" name="password" id="password" class="form-control" placeholder="请输入密码" required
    div class="checkbox"
     label
      input type="checkbox" value="remember-me" checked="checked" 记住密码
     /label
    /div
    button type="submit" class="btn btn-primary" id="btn-login"登录/button
    a href="reg.jsp" rel="external nofollow" rel="external nofollow" class="btn btn-default"注册/a
   /form
  /div
  div class="col-md-4"
  /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 class="navbar navbar-default"
 div class="container-fluid"
  div class="navbar-header"
   a class="navbar-brand" href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" jsp作业/a
  /div
  div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"
   ul class="nav navbar-nav navbar-right"
    lia 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 class="container"
 div class="row"
  div class="col-md-4"
  /div
  div class="col-md-4"

   form class="form-signin" action="reg-submit.jsp" method="post"
    h2 class="form-signin-heading"注册到jsp作业/h2
    div id="info"

    /div
    label for=""用户名/label
    input type="text" name="username" id="username" class="form-control" placeholder="请输入用户名" required autofocusbr
    label for=""密码/label
    input type="password" name="password" id="password" class="form-control" placeholder="请输入密码" requiredbr
    label for=""重复密码/label
    input type="password" name="password2" id="password2" class="form-control" placeholder="请再次输入密码" required maxLength="16"br
    button type="submit" class="btn btn-primary" 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" class="btn btn-default" id="btn-reg"返回登录/a
   /form
  /div
  div class="col-md-4"
  /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 class="navbar navbar-default"
 div class="container-fluid"
  div class="navbar-header"
   a class="navbar-brand" href="./" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" jsp作业/a
  /div
  div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"
   ul class="nav navbar-nav navbar-right"
    lia 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 class="container"
 % 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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这里写图片描述

这里写图片描述

这里写图片描述

这里写图片描述

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