如何用 Java 打开文件

有时我们必须在 Java 程序中打开一个文件. java.awt.Desktop 可以用来打开一个文件在 Java. 桌面实现是基于平台的,所以首先,我们应该检查操作系统是否支持桌面。

Java 開啟檔案

Let's have a look at the simple java open file program. If we try to open a file that doesn't exist, it will throw java.lang.IllegalArgumentException. Let's see Desktop class example for java open file. JavaOpenFile.java

 1package com.journaldev.files;
 2
 3import java.awt.Desktop;
 4import java.io.File;
 5import java.io.IOException;
 6
 7public class JavaOpenFile {
 8
 9    public static void main(String[] args) throws IOException {
10        //text file, should be opening in default text editor
11        File file = new File("/Users/pankaj/source.txt");
12
13        //first check if Desktop is supported by Platform or not
14        if(!Desktop.isDesktopSupported()){
15            System.out.println("Desktop is not supported");
16            return;
17        }
18
19        Desktop desktop = Desktop.getDesktop();
20        if(file.exists()) desktop.open(file);
21
22        //let's try to open PDF file
23        file = new File("/Users/pankaj/java.pdf");
24        if(file.exists()) desktop.open(file);
25    }
26
27}

当您运行上述程序时,文本文件将在默认文本编辑器中打开。类似地,在 Adobe Acrobat Reader 中将打开 PDF 文件. 如果没有与该文件类型相关的应用程序,或者应用程序未能启动,则打开方法会抛出java.io.IOException。