java用默认应用程序打开关联的文件

import java.awt.Desktop;import java.io.File;import java.io.IOException;public class TestDesktop {public static void main(String[] a) {try {Desktop desktop = null;if (Desktop.isDesktopSupported()) {desktop = Desktop.getDesktop();}desktop.open(new File("/home/naughty610/NNSearcherTest/aa.txt"));} catch (IOException ioe) {ioe.printStackTrace();}}}