在java中获取文件路径
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Getting file path in java
提问by markovuksanovic
Is there a way for java program to determine its location in the file system?
java程序有没有办法确定它在文件系统中的位置？
采纳答案by BalusC
You can use CodeSource#getLocation()for this. The CodeSourceis available by ProtectionDomain#getCodeSource(). The ProtectionDomainin turn is available by Class#getProtectionDomain().
您可以CodeSource#getLocation()为此使用。由CodeSource提供ProtectionDomain#getCodeSource()。该ProtectionDomain又是通过提供Class#getProtectionDomain()。
URL location = getClass().getProtectionDomain().getCodeSource().getLocation();
File file = new File(location.getPath());
// ...
This returns the exact location of the Classin question.
这将返回有问题的确切位置Class。
Update: as per the comments, it's apparently already in the classpath. You can then just use ClassLoader#getResource()wherein you pass the root-package-relative path.
更新：根据评论，它显然已经在类路径中。然后，您可以只使用ClassLoader#getResource()其中传递根包相对路径的位置。
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
URL resource = classLoader.getResource("filename.ext");
File file = new File(resource.getPath());
// ...
You can even get it as an InputStreamusing ClassLoader#getResourceAsStream().
您甚至可以将其作为InputStreamusing 获取ClassLoader#getResourceAsStream()。
InputStream input = classLoader.getResourceAsStream("filename.ext");
// ...
That's also the normal way of using packaged resources. If it's located inside a package, then use for example com/example/filename.extinstead.
这也是使用打包资源的正常方式。如果它位于包内，则使用 examplecom/example/filename.ext代替。
回答by james
if you want to get the "working directory" for the currently running program, then just use:
如果您想获取当前正在运行的程序的“工作目录”，则只需使用：
new File("");
回答by Akabelle
For me this worked, when I knew what was the exact name of the file:
对我来说，这有效，当我知道文件的确切名称是什么时：
File f = new File("OutFile.txt");System.out.println("f.getAbsolutePath() = " + f.getAbsolutePath());
File f = new File("OutFile.txt");System.out.println("f.getAbsolutePath() = " + f.getAbsolutePath());
Or there is this solution too: http://docs.oracle.com/javase/tutorial/essential/io/find.html
或者也有这个解决方案：http: //docs.oracle.com/javase/tutorial/essential/io/find.html
