mysql的连接

封装在一个类中
public class receive {

 private static  String driver="com.mysql.jdbc.Driver"; 
 private static  String url="jdbc:mysql://172.21.19.18:3306/samp_db";
 private static  String username="root";
 private static  String password="123456";

 public static Connection conn ;

public static   Connection getcCon(){



        try {
            System.out.println(driver);
            Class.forName(driver);      
            conn = (Connection) DriverManager.getConnection(url, username, password);
            System.out.println("mysql链接成功");
        } catch (ClassNotFoundException e) {
            System.out.println("驱动加载失败");
        }//classLoder,加载对应驱动
      catch (SQLException e) {
          System.out.println("数据库链接失败");
        }

    return conn;
}

public static void main(String[] args) {

    receive.getcCon();
}

}

Class.forName(driver); 是关于数据库的映射
DriverManager是Connection中的方法用于连接数据库
getConnection(url, username, password);接受来自数据库中url, username, password