java连接mysql数据库及测试是否连接成功的方法

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class JDBCUtlTool {

  public static Connection getConnection(){

    String driver="com.mysql.jdbc.Driver";  //获取mysql数据库的驱动类

    String url="jdbc:mysql://localhost:3306/test"; //连接数据库（kucun是数据库名）

    String name="root";//连接mysql的用户名

    String pwd="123456";//连接mysql的密码

    try{

      Class.forName(driver);

      Connection conn=DriverManager.getConnection(url,name,pwd);//获取连接对象

      return conn;

    }catch(ClassNotFoundException e){

      e.printStackTrace();

      return null;

    }catch(SQLException e){

      e.printStackTrace();

      return null;

    }

  }

  public static void closeAll(Connection conn,PreparedStatement ps,ResultSet rs){

    try{

      if(rs!=null){

        rs.close();

      }

    }catch(SQLException e){

      e.printStackTrace();

    }

    try{

      if(ps!=null){

        ps.close();

      }

    }catch(SQLException e){

      e.printStackTrace();

    }

    try{

      if(conn!=null){

        conn.close();

      }

    }catch(SQLException e){

      e.printStackTrace();

    }

  }

  public static void main(String[] args) throws SQLException

  {

    Connection cc=JDBCUtlTool.getConnection();

    if(!cc.isClosed())

    System.out.println("Succeeded connecting to the Database!");

    Statement statement = cc.createStatement();

    String sql = "select * from test2";

    ResultSet rs = statement.executeQuery(sql);

    while(rs.next()) {

      System.out.println(rs.getString("id")+"");

    }

  }

}