非靜態方法讀取

public void getConnection2() throws IOException{
InputStream is = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
Properties pro = new Properties();
pro.load(is);
System.out.println(pro.getProperty("username"));
}

但是靜態方法不可以，靜態方法可以通過如下方式：

public static Connection getConnection() {
try {

//關鍵兩行程式碼
ResourceBundle bundle = ResourceBundle.getBundle("jdbc");
System.out.println(bundle.getString("username"));//可以讀取key對應的value

//Class.forName(DRIVER_CLASS);
//conn = DriverManager.getConnection(DATABASE_URL,DATABASE_USRE, DATABASE_PASSWORD);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}