Java 标准DBUtil 写法

package xueruan.com.util;

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


public class DBUtil {
	public static Connection getConnection() {
		String username = "username";
		String password = "password";
		String url = "jdbc:mysql://localhost:3306/database";
		Connection con = null;
		try {
			con = DriverManager.getConnection(url, username, password);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return con;
	}
	
	public static void close(Connection con) {
		try {
			if(con!=null) con.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public static void close(java.sql.PreparedStatement ps) {
		try {
			if(ps!=null) ps.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public static void close(ResultSet rs) {
		try {
			if(rs!=null) rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}