jdbc 配置properties实现

package com.web.study;

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

public class ConnectionFactory {

	public static String driver;
	public static String dburl;
	public static String user;
	public static String password;

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

 	private ConnectionFactory() {

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

}

package com.web.study;

import java.sql.Connection;

public class ConnectionFactoryTest {

	public static void main(String[] args) throws Exception {
		ConnectionFactory cf = ConnectionFactory.getInstance();
		Connection conn = cf.makeConnection();
		System.out.println(conn.getAutoCommit());
	}
}