如何使用java连接mysql数据库？

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class TestOne {

 private static Connection connection;
 private static Statement statement;
 private static ResultSet result;

 public static void main(String[] args) {
  try {
   //加载jdbc驱动程序
   Class.forName("com.mysql.jdbc.Driver");
   //指明主机名（默认为：127.0.0.1）和端口号（默认为：3306）以及数据库名（必须指定）
   String url = "jdbc:mysql://localhost:3306/test1";
   //与数据库建立连接
   connection = DriverManager.getConnection(url, "root", "123456");
   //创建一个Statement对象将SQL语句发送到数据库
   statement = connection.createStatement();
   //将查询结果返回给result
   result = statement.executeQuery("select *from user");
   while(result.next()){
    System.out.println("name:" + result.getString(1) + "   password:" + result.getString(2));
   }
   connection.close();
   result.close();
   statement.close();
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
   try {
    if(connection != null)
     connection.close();
    if(result != null)
     result.close();
    if(statement != null)
     statement.close();
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
 }
}
/**
 * mysql> select *from user;
 *+----------+----------+
 *| name  | password |
 *+----------+----------+
 *| lisi  | 123456 |
 *| wangwu | 123456 |
 *| zhangsan | 123456 |
 *+----------+----------+
 *3 rows in set (0.54 sec)
 *
 *在java中的输出结果
 *name:lisi  password:123456
 *name:wangwu  password:123456
 *name:zhangsan  password:123456
 */

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class TestDemo {

 public static void main(String[] args) {
  String url="jdbc:sqlserver://localhost:1433;DatabaseName=Contellation";
  Connection conn = null;
  try {
   Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
   conn = DriverManager.getConnection(url, "sa", "");
   Statement statement=conn.createStatement();
   ResultSet rs = statement.executeQuery("select * from dbo.登陆表 ");
   while(rs.next()){
    System.out.println("用户名：" + rs.getString(1) + " 密码：" + rs.getString(2));
   }
   conn.close();
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } 
 }
}
/**
 * java中的输出结果
 * 用户名：张三 密码：123456
 *用户名：李四 密码：111111
 *用户名：王五 密码：123654
 *用户名：王延暾 密码：0123456789
 *用户名：曾安新 密码：123456
 */