如何访问Java 7 java.nio.file.Path中的子文件/文件夹？

发布于 2024-12-17 08:16:05 字数 626 浏览 1 评论 0原文

Java 7 引入了 java.nio.file.Path< /a> 作为 java.io.File 的可能的替代品。

使用文件，当我访问特定下的文件时，我会这样做：

File parent = new File("c:\\tmp");
File child = new File(parent, "child"); // this accesses c:\tmp\child

使用路径执行此操作的方法是什么？

我认为这会起作用：

Path parent = Paths.get("c:\\tmp");
Path child = Paths.get(parent.toString(), "child");

但是调用 parent.toString() 看起来很难看。有更好的办法吗？

原文

Java 7 introduced java.nio.file.Path as a possible replacement for java.io.File.

With File, when I access a file under a specific, I would do:

File parent = new File("c:\\tmp");
File child = new File(parent, "child"); // this accesses c:\tmp\child

What's the way to do this with Path?

I supposed this will work:

Path parent = Paths.get("c:\\tmp");
Path child = Paths.get(parent.toString(), "child");

But calling parent.toString() seems ugly. Is there a better way?

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念﹏祤嫣 2024-12-24 08:16:05

使用 resolve 方法” rel="noreferrer">Path。

有两种使用此名称的方法。 One 采用相对 Path 和其他< /a> 一个字符串。它使用在其上调用的 Path 作为父级，并适当地附加 String 或相对 Path。

Path parent = Paths.get("c:\\tmp");
Path child = parent.resolve("child");

Use the resolve method on Path.

There are two methods with this name. One takes a relative Path and the other a String. It uses the Path on which it is called as a parent and appends the String or relative Path appropriately.

Path parent = Paths.get("c:\\tmp");
Path child = parent.resolve("child");

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古镇旧梦 2024-12-24 08:16:05

对于任何发现此问题仅专门查找指定路径内的文件的人，您必须了解路径遍历攻击。

请参阅：在Java（或Scala）中过滤向上路径遍历

检查路径是否从根开始是至关重要。

Path parent = Paths.get("C:\\tmp");
Path child = parent.resolve("chlid").normalize();
if (!child.startsWith(parent)) {
    throw new IllegalArgumentException("Potential Path Traversal Attack");
}

To anyone finding this question looking specifically only for files that are within the specified path, you must be aware of path traversal attacks.

See: Filtering upwards path traversal in Java (or Scala)

It is critical that you check that the path starts with the root.

Path parent = Paths.get("C:\\tmp");
Path child = parent.resolve("chlid").normalize();
if (!child.startsWith(parent)) {
    throw new IllegalArgumentException("Potential Path Traversal Attack");
}

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