JavaWeb连接MySQL数据库

这里声明一下,仅供参考,因为自己也没做完。

一.在这里我们先创建几个jsp页面,在这里我做了4个jsp页面分别是login.jsp,success.jsp,error.jsp,check.jsp。

1.login.jsp登录页面

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<%@ 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="UTF-8">
<title>登录页面</title>
<link rel="stylesheet" type="text/css" href="login.css" />
<%--Font Awesome 字体为您提供可缩放矢量图标,它可以被定制大小、颜色、阴影以及任何可以用CSS的样式。 --%>
<link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css">
</head>
<body>
   <div id="bigBox">
             <h1>LOGIN</h1>
             <div class="inputBox">
                <from action="check.jsp" method="post">
                <div class="inputText">
                <i class="fa fa-user-circle" style="color: whitesmoke;"></i>
                <input type="text" placeholder="ID" name="username"/>
                </div>
              <div class="inputText">
              <i class="fa fa-key" style="color: whitesmoke;"></i>
              <input type="password" placeholder="密码" name="password"/>
              </div>
              <input type="submit" class="inputButton" value="LOGIN" />
              </from>  
      </div>
   </div>
</body>
</html>
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2.success.jsp登录成功的页面

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<%@ 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=UTF-8">
<title>登录成功</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css">
    <link rel="stylesheet" type="text/css" href="login.css" />
</head>
<body>
<div id="main">
    <i class="fa fa-diamond fa-5x" style="color: #ed9db2; size: 50;"></i>
        <h3 style="display: inline-block; ">登陆成功!!</h3>
        </div>
</body>
</html>
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3.error.jsp登录失败的页面

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<%@ 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=UTF-8">
<title>登录失败</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css">
    <link rel="stylesheet" type="text/css" href="login.css" />
</head>
<body>
<div id="main">
        <i class="fa fa-exclamation-triangle fa-5x" style="color: darkgrey; size: 50;"></i>
        <h3 style="display: inline-block; ">登陆失败,请重新检查用户名或密码是否正确!!</h3>
    </div>
</body>
</html>
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4.check.jsp检查页面,里面包含获取请求和响应页面的跳转,也是在此页面进行数据库的连接

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<%@page import="org.apache.jasper.tagplugins.jstl.core.Catch"%>
<%@page import="org.omg.PortableInterceptor.SUCCESSFUL"%>
<%@page import="org.apache.jasper.tagplugins.jstl.core.If"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%--这里是导入包:在程序中包含数据库所需的JDBC的类。大多数情况下使用import java.sql.*  就足够了 --%>
<%@ page import="java.sql.*"%>
<%@ page import="java.math.*" %>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
   <%
       String username = request.getParameter("username");
       String password = request.getParameter("password");
       Connection connection = null;
       Statement statement = null;
       ResultSet rs = null;
       String name = "root";
       String pwd = "1234";
       try {
           //这里是进行JDBC驱动程序的注册,导入驱动,加载具体的驱动类
           Class.forName("com.mysql.cj.jdbc.Driver");
           //与数据库建立连接
           connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test01",name,pwd);
           statement = connection.createStatement();
           //发送sql语句,执行
           String sql = "select count(1) from login where username = '"+username+"' and password = '"+password+"' ";
           rs = statement.executeQuery(sql);
           //处理结果
           int count = -1;
           if (rs.next()){
               count = rs.getInt(1);
           }
           if (count>0){
               request.getRequestDispatcher("success.jsp").forward(request, response);
           }else {
               request.getRequestDispatcher("error.jsp").forward(request, response);
           }}catch (ClassNotFoundException e){
               e.printStackTrace();
           }catch (SQLException e){
               e.printStackTrace();
           }finally {
               try {
                   if(rs != null) rs.close();
                   if(statement !=null)statement.close();
                   if(connection != null) connection.close();
               }catch (SQLException e){
                   e.printStackTrace();
               }
           }   
%>
</body>
</html>
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在这里呢,我多做了一个login的css页面优化,将登录框进行优化,背景还没有添加,大家可以自行添加

特加login.css:

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@charset "UTF-8";
body{
    margin: 0;
    padding: 0;
    background-image: url();
    background-repeat: no-repeat;
}
a{
    color: #666;
    text-decoration: none;
}
#bigBox
{
    margin: 0 auto;
    margin-top: 100px;
    padding: 20px 50px;
    background-color: #000000;
    width: 500px;
    height: 400px;
    border-radius: 20px;
    text-align: center;
    background-image: linear-gradient(60deg, #29323c 0%, #485563 100%);
}
#bigBox h1
{
    font-size: 40px;
    color: floralwhite;
}
#bigBox .inputBox
{
    margin-top: 35px;
}
#bigBox .inputBox .inputText
{
    margin-top: 20px;
}
#bigBox .inputBox .inputText input
{
    border:0;
    padding: 10px 10px;
    border-bottom: 1px solid white;
    background-color: #00000000;
    color: white;
    width: 200px;
    height: 40px;
    font-size: 20px;
}
#bigBox .inputBox .inputText i
{
    color: white;
}
#bigBox .inputBox .inputButton
{
    border: 0;
    width: 200px;
    height: 50px;
    color: white;
    margin-top: 55px;
    border-radius: 20px;
    background-image: linear-gradient(to right, #b8cbb8 0%, #b8cbb8 0%,#b465da 0%, #cf6cc9 33%, #ee609c 66%, #ee609c 100%);
}
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目前也就做到这里,至于本人跳转页面也是出了点问题,还不知道在哪,欢迎大家指点一下,thanks。

后续做完会有更加详细的内容。

 

posted @   ice798  阅读(199)  评论(0编辑  收藏  举报
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