如何使用 Java 8 `Files.find` 方法？
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How to use Java 8 `Files.find` method?
提问by
I am trying to write an app to use Files.findmethod in it.
我正在尝试编写一个应用程序以Files.find在其中使用方法。
Below program works perfectly :
下面的程序完美运行：
package ehsan;
/* I have removed imports for code brevity */
public class Main {
public static void main(String[] args) throws IOException {
Path p = Paths.get("/home/ehsan");
final int maxDepth = 10;
Stream<Path> matches = Files.find(p,maxDepth,(path, basicFileAttributes) -> String.valueOf(path).endsWith(".txt"));
matches.map(path -> path.getFileName()).forEach(System.out::println);
}
}
This works fine and gives me a list of files ending with .txt( aka text files ) :
这工作正常，并为我提供了以.txt（又名文本文件）结尾的文件列表：
hello.txt
...
But below program does not show anything :
但下面的程序没有显示任何内容：
package ehsan;
public class Main {
public static void main(String[] args) throws IOException {
Path p = Paths.get("/home/ehsan");
final int maxDepth = 10;
Stream<Path> matches = Files.find(p,maxDepth,(path, basicFileAttributes) -> path.getFileName().equals("workspace"));
matches.map(path -> path.getFileName()).forEach(System.out::println);
}
}
But it does not show anything :(
但它没有显示任何内容:(
Here is my home folder hiearchy (lsresult) :
这是我的主文件夹层次结构（ls结果）：
blog Projects
Desktop Public
Documents Templates
Downloads The.Purge.Election.Year.2016.HC.1080p.HDrip.ShAaNiG.mkv
IdeaProjects The.Purge.Election.Year.2016.HC.1080p.HDrip.ShAaNiG.mkv.aria2
Music Videos
Pictures workspace
So whats going wrong with path.getFileName().equals("workspace")?
那么有什么问题path.getFileName().equals("workspace")呢？
采纳答案by David
Path.getFilename() does not return a string, but a Path object, do a getFilename().toString().equals("workspace")
Path.getFilename() 不返回一个字符串，而是一个 Path 对象，做一个 getFilename().toString().equals("workspace")
回答by Yassin Hajaj
Use the following and look at the console. Maybe none of your files contains workspacein it
使用以下并查看控制台。也许你的文件都不包含workspace其中
Files.find(p,maxDepth,(path, basicFileAttributes) -> {
if (String.valueOf(path).equals("workspace")) {
System.out.println("FOUND : " + path);
return true;
}
System.out.println("\tNOT VALID : " + path);
return false;
});
