設置配置文件鏈接數據庫

DbUtil.class鏈接數據庫 

public class DbUtil {
    private static String className;
    private static String url;
    private static String pwd;
    private static String users;
    private static Properties prop = new Properties();
    //靜態塊 在方法被調用之前就執行了
    static {
        InputStream is = DbUtil.class.getResourceAsStream("Config.properties");
        try {
            prop.load(is);
            className = prop.getProperty("className").trim();
            url = prop.getProperty("url").trim();
            users = prop.getProperty("users").trim();
            pwd = prop.getProperty("pwd").trim();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        try {
            Class.forName(className);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static Connection getConnection() throws SQLException {
        Connection conn = DriverManager.getConnection(url, users, pwd);
        System.out.println("連接成功！");
        return conn;
    }
    public static void closeConnection(Connection conn) throws SQLException{
        if(conn!=null){
            conn.close();
        }
    }
    public static void main(String []args) throws SQLException {
        System.out.println(getConnection());
    }
}

配置文件：Config.properties

className=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:XE
users=supermarket
pwd=0000