JAVA实现登录、注册（eclipse、mysql、servlet、tomcat、C3P0Pool）

本文链接： https://blog.csdn.net/shujuku____/article/details/102647755

1.创建一个动态WEB工程
拷入相应的jar包（注意：jar包的位置在lib目录下面）
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导入数据库homework1.sql

Create database homework1;
Use homework1;
Create table user (
id int(4)  auto_increment  primary key,
Username varchar(30) not null unique,
Age varchar(10),
Sex varchar(10),
Hobby varchar(30),
Password varchar(30)
);
Insert into user(Username ,age,sex,hobby,password) values(‘hello’,20,’男’,’打篮球’,’123456’);

2.在src拷入C3P0配置文件
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<?xml version='1.0' encoding='UTF-8'?>
<c3p0-config>
          <default-config> <!--默认配置方式-->
    <property name="driverClass">com.mysql.jdbc.Driver</property>
    <property name="jdbcUrl">jdbc:mysql:///homework1</property>
    <property name="user">root</property>
    <property name="password">root</property>
    <property name="initialPoolSize">5</property>
    <property name="maxPoolSize">20</property>
</default-config>


</c3p0-config>

3.创建连接池
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package com.wangrui.c3p0pool;

import java.sql.Connection;
import java.sql.SQLException;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JDBCC3P0Pool {
	private static ComboPooledDataSource dataSource = new ComboPooledDataSource();
	
	public static Connection getConnect() {
		Connection conn = null;
		try {
			conn = dataSource.getConnection();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
		
	}

}

4.测试连接情况
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package com.wangrui.c3p0test;
/**
 * 该类用于查询数据库连接是否正确
 * @author wangrui
 *
 */
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.wangrui.c3p0pool.JDBCC3P0Pool;

public class C3P0Test {

	public static void main(String[] args) {
		Connection conn = JDBCC3P0Pool.getConnect();
		System.out.println(conn);
		try {
			PreparedStatement ps = conn.prepareStatement("select *from user");
			ResultSet query = ps.executeQuery();
			while(query.next()) {
				System.out.println(query.getString("username")
				+"--"+query.getString("password"));
			}
			
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

}

5 写登录注册界面(注意写在WebContent目录下)
在这里插入图片描述

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
<style> 
body{
 text-align:center
 } 
.div{
 margin:0 auto; 
 width:400px; 
 height:300px; 
 border:1px solid #F00
 } 
 .div input{
 margin:10px; 
 }

</style>

</head>
<body>
<div class="div">
	<h1>登录</h1>
	<form action="login" method="post">
	<label>用户名</label>
	<input type="text" name="username"/>
	<br>
	<label>密码</label>
	<input type="password" name="password"/>
	<br>
	<input type="submit" value="提交">
	<br>
	<label>没有账号？<a href="regist.html">立马注册</a></label>
	</form>
</div>
</body>
</html>

在这里插入图片描述

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册</title>
<style> 
body{
 text-align:center
 } 
.div{
 margin:0 auto; 
 width:400px; 
 height:400px; 
 border:1px solid #F00
 } 
 .div input{
 margin:10px; 
 }

</style>
</head>
<body>
<div class="div">
	<h1>注册</h1>
	<form action="register" method="post">
	<label>姓名(用户名)*</label>
	<input type="text" name="username"/>
	<br>
	<label>年龄</label>
	<input type="text" name="age"/>
	<br>
	<label>性别</label>
	<input type="text" name="sex"/>
	<br>
	<label>爱好</label>
	<input type="text" name="hobby"/>
	<br>
	<label>密码*</label>
	<input type="password" name="password"/>
	<br>
	<input type="submit" value="注册">
	</form>
</div>
</body>
</html>

6,.写登录、注册Servlet

package com.wangrui.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wangrui.controller.login;


public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private login login;
	
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//1.设置请求、响应编码
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		//2.从表单获取数据
		String username = req.getParameter("username");
		String password = req.getParameter("password");
		//3.数据库查询数据并返回结果
		login login= new login();
		boolean userlogin = login.userlogin(username, password);
		if(userlogin) {
			resp.getWriter().write("<h1>恭喜你!!!登录成功</h1>");
		}else {
			System.out.println(userlogin+"登录失败!!!用户名或密码错误");
			resp.getWriter().write("<h1>登录失败!!!用户名或密码错误</h1>");
		}
		
	}



}

package com.wangrui.controller;
/**
 * 该类用于查询用户登录的信息是否正确
 * @author wangrui
 *
 */

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.wangrui.c3p0pool.JDBCC3P0Pool;

public class login {
	
	public boolean userlogin(String username,String password){
		if(username.equals("") || password.equals("")){
			return false;
		}
		
        Connection conn=JDBCC3P0Pool.getConnect();
        PreparedStatement ps;
        try{
        	String sql="SELECT * FROM user where username = '"+username+
        			"' and password = '"+password+"'";
        	ps = conn.prepareStatement(sql);
			ResultSet query = ps.executeQuery();
			return query.next();
           
        }catch (Exception e) {
            e.printStackTrace();
            System.out.println(e);
        }
       
        return false;
    }

    

}

package com.wangrui.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wangrui.controller.register;


public class RegisterServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//1.设置请求、响应编码
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		//2.从表单获取数据
		String username = req.getParameter("username");
		String password = req.getParameter("password");
		String s = req.getParameter("age");
		int age = Integer.parseInt(s);
		String sex = req.getParameter("sex");
		String hobby = req.getParameter("hobby");
		//3.数据库查询数据并返回结果
		register register =new register();
		boolean userRegister = register.userRegister(username, age, sex, hobby, password);
		if(userRegister) {
			System.out.println(userRegister+"注册成功");
			resp.getWriter().write("<h1>恭喜你!!!注册成功<a href=\"login.html\">马上登录</a></h1>");
		}else {
			System.out.println(userRegister+"注册失败!!!");
			resp.getWriter().write("<h1>注册失败!!!</h1>");
		}
	}
}

package com.wangrui.controller;

import java.sql.Connection;
import java.sql.PreparedStatement;
import com.wangrui.c3p0pool.JDBCC3P0Pool;

/**
 * 该类用于查询用户注册的信息是否正确
 * @author wangrui
 *
 */
public class register {
	public boolean userRegister(String username,int age,String sex,String hobby,String password){
		if(username.equals("") || password.equals("")){
			return false;
		}
        Connection conn=JDBCC3P0Pool.getConnect();
        PreparedStatement ps;
        try{
        	String sql=" insert into user(username,age,sex,hobby,password)"
        			+ " values('"+username+"',"+age+",'"+sex+"','"+hobby+"','"+password+"')";
        	ps = conn.prepareStatement(sql);
        	int num = ps.executeUpdate();//添加、删除、更新数据
			if(num>0){
				System.out.println("插入数据成功");
			}
           return true;
        }catch (Exception e) {
            e.printStackTrace();
            System.out.println(e);
        }
        return false;
    }


}

JAVA实现登录、注册（eclipse、mysql、servlet、tomcat、C3P0Pool）

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