自己写的DBUtil数据库连接工具类

//DBUtil.java
package vill.util;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;


/**
 * @author vill
 *
 */
public class DBUtil {
	private static String driver;
	private static String url;
	private static String user;
	private static String pwd;
	//static语句块初始化字段信息
	static{
		try {
			Properties properties = new Properties();
			properties.load(DBUtil.class.getClassLoader().getResourceAsStream("vill/util/db.properties"));
			driver = properties.getProperty("driver");
			url = properties.getProperty("url");
			user = properties.getProperty("username");
			pwd = properties.getProperty("password");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 获取与数据库的连接
	 * @return
	 * @throws Exception
	 */
	public static Connection getConnection() throws Exception{
		Class.forName(driver);
		return DriverManager.getConnection(url, user, pwd);
	}
	/**
	 * 关闭连接
	 * @param conn
	 * @param stm
	 * @param rs
	 */
	public static void closeConnection(Connection conn,Statement stm,ResultSet rs){
		try {
			if (conn != null)
				conn.close();
			if (stm != null)
				stm.close();
			if (rs != null)
				rs.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	public static void main(String[] args) {
		try {
			System.out.println(new DBUtil().getConnection().getClass().getName());;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

//配置文件db.properties
####oracle connection info
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:vill
username=vill
password=villvill

####mysql connection info
#driver=com.mysql.jdbc.Driver
#url=jdbc:mysql://localhost:3306/vill
#username=root
#password=root