数据库连接工厂

package com.jikexueyuan.util;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class ConnectionFactory {
	
	private static String driver;
	private static String dbrul;
	private static String user;
	private static String password;
	private static final ConnectionFactory FACTORY = new ConnectionFactory();
	private Connection conn;
	
	static{
		Properties properties = new Properties();
		try {
			InputStream in = ConnectionFactory.class.getClassLoader().getResourceAsStream("dbconfig.properties");
			properties.load(in);
		} catch (Exception e) {
			System.out.println("==========配置文件读取错误==========");
		}
		driver = properties.getProperty("driver");
		dbrul = properties.getProperty("dburl");
		user = properties.getProperty("user");
		password = properties.getProperty("password");

	}
	
	private ConnectionFactory(){
		
	}
	
	public static ConnectionFactory getInstance(){
		return FACTORY;
	}
	
	public Connection makeConnection(){
		try {
			Class.forName(driver);
			conn = DriverManager.getConnection(dbrul, user, password);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return conn;
	}

}