1.导入jar包
2.数据库连接字符串

public static final String URL="jdbc:mysql://localhost:3306/xuanke?&useSSL=false&serverTimezone=UTC";

3.加载驱动：Class.forName(驱动路径)

Class.forName("com.mysql.cj.jdbc.Driver");

4.创建数据库的连接

try {
				conn=DriverManager.getConnection(URL,NAME,PWD);
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		 return conn;
	}

5.执行sql语句

public static void main(String[] args) {
		System.out.println(DBHelper.getconn());
	}
	 
}

6…关闭连接

public void realease(Connection coon) {
		if (conn!=null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}```