jdbc连接Mysql数据库

package com.bsonline.test.mysqlTest;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class MySQLTest {
  private static final String URL="jdbc:mysql://localhost/bsonline";
  private static final String USERNAME="root";
  private static final String PASSWORD="123456";

 /**
  *@author： zhangjp
  * @throws ClassNotFoundException
  *@功能：
  *@公用：
  *@date：Apr 30, 2010 4:34:19 PM
  **/
 public static void main(String[] args) throws ClassNotFoundException {
  try {
   //注册驱动
   Class.forName("com.mysql.jdbc.Driver");
   //获得连接
   Connection conn = DriverManager.getConnection(URL,USERNAME,PASSWORD);
   //sql语句
   String sql = "select * from system where id =?";
   //获得prepareStatement对象，编译sql
   PreparedStatement ps=conn.prepareStatement(sql);
   //设置查询值
   ps.setInt(1, 1);
   //执行sql，获得结果集
   ResultSet rs = ps.executeQuery();
   //遍历结果集
   while(rs.next()){
    System.out.println(rs.getInt("id")+ "  "+rs.getString("username")+"    "+rs.getString("password"));
   }
   //
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
       
 }

}