JDBC tool class package

Every time we use jdbc, we have to
load the driver class,
create a link,
create a Statement interface object, execute sql, and
close the resource
.

package com.xzlf.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ResourceBundle;

public class JdbcUtil {

	private static String driver;
	private static String jdbcUrl;
	private static String username;
	private static String userpassword;
	static {
		// 读取properties 文件
		ResourceBundle bundle = ResourceBundle.getBundle("jdbc");
		driver = bundle.getString("driver");
		jdbcUrl = bundle.getString("jdbcUrl");
		username = bundle.getString("username");
		userpassword = bundle.getString("userpassword");
		
		try {
			Class.forName(driver);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 获取connection 对象
	 * @return
	 */
	public static Connection getConnection() {
		Connection conn = null;
		try {
			conn = DriverManager.getConnection(jdbcUrl, username, userpassword);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}
	
	/**
	 * 释放资源
	 * @param rs
	 * @param stat
	 * @param conn
	 */
	public static void closeResource(ResultSet rs, Statement stat, Connection conn) {
		try {
			if(rs != null) {
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		try {
			if(stat != null) {
				stat.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		try {
			if(conn != null) {
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}