java代码实现连接mysql数据库

public class JDBCTest {
 public static void main(String[] args) throws SQLException {
  //1.注册数据库驱动
  DriverManager.registerDriver(new Driver());
  //2.获取数据库连接
  Connection conn= DriverManager.getConnection("jdbc:mysql:///yhdb", "root", "root");
  //3.获取传输器
  Statement stat= conn.createStatement();
  //4.执行SQL
  ResultSet rs= stat.executeQuery("select * from tb_door");
  //5.遍历结果集
  while(rs.next()){
   //int  id = rs.getInt(1);也可用int类型去获取id
   String id = rs.getString(1);
   String doorName = rs.getString(2);
   String tel = rs.getString(3);
   System.out.println(id+" "+doorName+" "+tel);
  }
  //6.释放资源
  rs.close();
  stat.close();
  conn.close();
  }
  }