使用jdbc连接oracle

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
username=system
password=123456

package com.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.ResourceBundle;

public class OracleJdbc {
    private static String driver;
    private static String url;
    private static String username;
    private static String password;


    static {
        ResourceBundle properties = ResourceBundle.getBundle("oracle");
        driver = properties.getString("driver");
        url = properties.getString("url");
        username = properties.getString("username");
        password = properties.getString("password");
    }

    public static Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url,username,password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }

    public static void closeConnection(Connection conn) {
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}