1.工程文件
基本的文件布局，没使用任何css文件，就是简单实现登录注册，页面没有做任何美化；
使用的是MySQL8.0.12，8一下的mysql链接代码有微小差别，网上教程基本都是8一下的，随便找找就能找到；
2.DBBean.java
package Bean;
import java.sql.*;
public class DBBean {
private String driverStr = "com.mysql.cj.jdbc.Driver";
private String connStr = "jdbc:mysql://localhost:3306/users?serverTimezone=UTC";
private String dbusername = "root";
private String dbpassword = "lufengyu";
public Connection conn = null;
public Statement stmt = null;
public DBBean()
{
try
{
Class.forName(driverStr);
conn = DriverManager.getConnection(connStr,dbusername,dbpassword);
stmt = conn.createStatement();
}
catch(Exception ex) {
System.out.println(ex.getMessage());
System.out.println("mysql链接失败");
}
}
}dbusername和dbpassword个人修改过，默认的都是root，这部分就是链接数据库的功能；
3.login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>登录页面</title>
</head>
<body>
<div class="center" align="center">
<h1 style="color:black">欢迎登录</h1>
<form id="indexform" name="indexForm" action="check.jsp" method="post">
<table border="0">
<tr>
<th>账号：</th>
<td><input type="text" name="username"></td>
</tr>
<tr>
<th>密码：</th>
<td><input type="password" name="password"></td>
</tr>
</table>
<br><input type="submit" value="登 录">
</form>
<br><a href="zhuce.jsp">没有账号？注册</a>
</div>
</body>
</html>4.check.jsp
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="db" class="Bean.DBBean" scope="page"/>
<%
request.setCharacterEncoding("utf-8");
String username=(String)request.getParameter("username");
String password=(String)request.getParameter("password");
String sql="select * from sky where username="+"'"+username+"'";
ResultSet rs = db.stmt.executeQuery(sql);
if(rs.next()){
if(password.equals(rs.getObject("password"))){
response.sendRedirect("success.jsp");
}
else{
out.print("<script language='javaScript'> alert('密码错误');</script>");
response.setHeader("refresh", "0;url=login.jsp");
}
}
else{
out.print("<script language='javaScript'> alert('账号错误');</script>");
response.setHeader("refresh", "0;url=login.jsp");
}
%>
</body>
</html>5.zhuce.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>注册</title>
</head>
<body>
<div class="center" align="center">
<h1>欢迎注册</h1>
<form action="zhuceck.jsp" method="post">
<table border="0">
<tr>
<th>账号:</th>
<td><input type="text" name="username"></td>
</tr>
<tr>
<th>密码:</th>
<td><input type="password" name="password"></td>
</tr>
</table>
<br><input type="submit" value="注 册">
</form>
</div>
</body>
</html>6.zhuceck.jsp
<%@ page language="java" import="java.util.*,java.sql.*" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="db" class="Bean.DBBean" scope="page"/>
<%
request.setCharacterEncoding("utf-8");
String username=(String)request.getParameter("username");
String password=(String)request.getParameter("password");
String sqlf="select * from sky where username ="+"'"+username+"'";
String sqlc="insert into `sky`(`username`,`password`) values ('"+username+"','"+password+"')";
ResultSet rs = db.stmt.executeQuery(sqlf);
if(rs.next()){
out.print("<script language='javascript'> alert('账号已经存在');</script>");
response.setHeader("refresh", "0;url=zhuce.jsp");
}
else{
db.stmt.executeUpdate(sqlc);
response.sendRedirect("zhucesu.jsp");
}
%>
</body>
</html>7.success.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>登录成功</title>
</head>
<body style="text-align:center">
<h1>登陆成功</h1>
</body>
</html>8.zhucesu.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body style="text-align:center">
<br><a href="login.jsp">注册成功，前往登录</a>
</body>
</html>9.数据库创造
CREATE TABLE `sky`
(
`id` int(5) NOT NULL AUTO_INCREMENT,
`username` VARCHAR(45) DEFAULT NULL,
`password` VARCHAR(45) DEFAULT NULL,
UNIQUE KEY `username_UNIQUE` (`username`),
PRIMARY KEY (`id`)
)ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
INSERT INTO `sky`(`id`,`username`,`password`)values
('1','admin','admin'),
('2','lfy','lufengyu');结果（运行login.jsp)
菜鸡互啄！！
总结
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