Java:运行JAR文件时如何获取文件路径 [英] Java: How to get path of a file when running JAR file

问题描述

使用相对路径时，可以从Eclipse运行Java程序.但是当我将其作为JAR文件运行时，该路径不再起作用.在我的src/components/SettingsWindow.java中，我有:

When I use relative path, I can run my Java program from Eclipse. But when I run it as a JAR file, the path doesn't work anymore. In my src/components/SettingsWindow.java I have:

ObjectInputStream ois = new ObjectInputStream(new FileInputStream("./src/files/profile.ser"));

我收到FileNotFoundException.

I get a FileNotFoundException.

我的文件目录如下:文件目录

我尝试过的事情:

字符串filePath = this.getClass().getResource("/files/profile.ser").toString();

字符串filePath = this.getClass().getResource("/files/profile.ser").getPath();

字符串filePath = this.getClass().getResource("/files/profile.ser").getFile().toString();

然后我将filePath放在新的FileInputStream(filePath)中，但是这些都不起作用，我仍然收到FileNotFoundException.当我 System.out.println(filePath)时，它说:files/profile.ser

And I'd just put filePath in new FileInputStream(filePath) but none of these work and I still get a FileNotFoundException. When I System.out.println(filePath) it says: files/profile.ser

当我在src/components/SettingsWindow.java中时，我试图获取src/files/profile.ser的路径

I'm trying to get the path of src/files/profile.ser while I'm in src/components/SettingsWindow.java

推荐答案

您可以获取该类的URL:

You can get the URL to the class:

        String path =                                                           
            String.join("/", getClass().getName().split(Pattern.quote(".")))    
            + ".class";                                                         
        URL url = getClass().getResource("/" + path);

将会生成"file:/path/to/package/class.class"或"jar:/path/to/jar.jar！/package/class.class".您可以使用URL或使用

which will either yield "file:/path/to/package/class.class" or "jar:/path/to/jar.jar!/package/class.class". You either can work with the URL or use

            JarFile jar =                                                       
                ((JarURLConnection) url.openConnection()).getJarFile();

并使用 jar.getName()获取解析路径以获取安装目录.

and use jar.getName() to get the path to parse to get your installation directory.

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