JDBCUtil JDBC工具类的实现

package com.shower.exercise.jdbc.util;


import java.sql.*;
import java.util.ResourceBundle;

/**
 * @author suchuner
 * @className JDBCUtil
 * @description TODO
 * @date 2018-09-13 10:55
 */
public class JDBCUtil {
    private JDBCUtil() {
    }

    private static ResourceBundle bundle=ResourceBundle.getBundle("jdbc");//直接写配置文件名称即可，不需要加后缀
    private static String driver_class_name = bundle.getString("jdbc.driver_class_name");
    private static String url = bundle.getString("jdbc.url");
    private static String username = bundle.getString("jdbc.username");
    private static String password = bundle.getString("jdbc.password");

    static {
        try {
            Class.forName(driver_class_name);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static Connection getConn() {
        try {
            return DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static Connection getConn(String url, String user, String password) {
        try {
            return DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void close(Connection conn, PreparedStatement ps, ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (ps != null) {
                    ps.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (conn != null) {
                        conn.close();
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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配置文件内容：