Java:非小程序应用程序上的 getCodeBase() [英] Java: getCodeBase() on non-applet application

问题描述

我正在尝试创建一个 URL 来访问本地文件，如下所示:

I'm trying to create a URL to access a local file like so:

URL myURL = new URL(getCodeBase(), "somefile.txt");

但是当它尝试 getCodeBase() 时会抛出 NullPointerException.我相当肯定这背后的原因是因为这段代码所属的类文件不是小程序.有什么方法可以在不使用小程序的情况下获得代码库吗?我只想访问本地文件，而不必将实际目录放入(因为当其他人运行应用程序时，目录路径显然不一样).

But it throws a NullPointerException when it attempts getCodeBase(). I'm fairly certain that the reason behind this is because the class file that this code belongs to is not an applet. Is there any way I can get the code base without using an applet? I just want to access a local file without having to put the actual directory in (because when others run the application the directory path will obviously not be the same).

推荐答案

我会使用以下相对于工作目录

I would use the following to be relative to the working directory

URL myURL = new URL("file:somefile.txt");

或

URL myURL = new URL("file", "", "somefile.txt");

或

File file = new File("somefile.txt");

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