在 Linux 中从 Java 访问“~”（用户主页）
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Accessing "~" (user home) from Java in Linux
提问by artouiros
I need to create a configuration file in ~/.config/myapp.cfg So I am doing this with File:
我需要在 ~/.config/myapp.cfg 中创建一个配置文件所以我这样做File：
File f;
f = new File("~/.config/gfgd.gfgdf");
if(!f.exists()){
f.createNewFile();
}
The problem is, that it tell me, that directory doesn't exist and something like this.
问题是，它告诉我，该目录不存在，诸如此类。
java.io.IOException: Not such file or directory
at java.io.UnixFileSystem.createFileExclusively(Native Method)
I tried changing path to something like /home/user and it worked. So i managed to make a conclusion, that java doesn't know what ~/ means and what a punct(.) before foldername means too, because /home/user/.config doesn not work aswell.
我尝试将路径更改为 /home/user 之类的内容，并且成功了。所以我设法得出一个结论，java 不知道 ~/ 是什么意思以及文件夹名之前的 punct(.) 是什么意思，因为 /home/user/.config 也不起作用。
What should I do?
我该怎么办？
回答by aioobe
The ~notation is a shell thing. Read up on shell expansion.
该~符号是一个shell的事情。阅读有关外壳扩展的信息。
Java doesn't understand this notation. To get hold of the home directory, get the system propertywith key user.home:
Java 不理解这种表示法。要获取主目录，请使用 key获取系统属性user.home：
String home = System.getProperty("user.home");
File f = new File(home + "/.config/gfgd.gfgdf");
(As a bonus, it will work on windows machines too ;-)
（作为奖励，它也可以在 Windows 机器上运行 ;-)
回答by fvu
User the user.homeSystem property. To completely avoid operating system dependencies you should let File do the path resolution, like this:
用户user.home系统属性。为了完全避免操作系统依赖性，您应该让 File 进行路径解析，如下所示：
f = new File(new File (System.getProperty("user.home"),".config"),"gfgd.gfgdf");
回答by Sandro Munda
Instead of using directly the ~shortcut, you should use (it also works on Windows)
~您应该使用（它也适用于 Windows）而不是直接使用快捷方式
System.getProperty("user.home");
Example :
例子 ：
File f = new File(System.getProperty("user.home") + "/.config/gfgd.gfgdf");
if (!f.exists()) {
f.createNewFile();
}
