java.io:重命名绝对文件路径

时间:2015-07-24 02:15:14

标签: java io directory file-rename

我正在为"正常化"写一个小工具。文件和目录名称,使其具有可移植性,互操作性以及由于非ASCII字符,空格和其他恶意字符等文件名导致的愚蠢和痛苦错误的安全性。(请参阅this SuperUser answer以获取简明摘要几个真正安全的角色)。

为此,我想将具有不安全名称的文件/目录重命名为安全名称,包括相应地重命名所有父目录。即使我需要使用java.io,也不应该成为一个问题;但是我似乎无法重命名包含其他目录的目录(包含文件可以正常工作)。

这是我的方法:

public static File renameSafe(File unsafe) throws IOException {
    if (!unsafe.exists()) {
        throw new FileNotFoundException(unsafe.toString());
    }

    // create full "safe" path
    File safe = toSafeFile(unsafe);
    File origSafe = safe;

    while (unsafe != null) {
        // rename the lowest unsafe level
        File unsafeParent = unsafe.getParentFile();
        File safeTarget = new File(unsafeParent, safe.getName());
        if (!unsafe.renameTo(safeTarget)) {
            throw new IOException("Could not rename " + unsafe + " to " + safe);
        }

        unsafe = unsafeParent;
        safe = safe.getParentFile();
    }

    return origSafe;
}

当我运行这个主要方法时:

public static void main(String[] args) throws IOException {
    File file = new File("\\test\\-bad.folder NAME ÄÖÜßéÂÌ\\.bad folder 2\\test filename-ÄÖÜ.txt");
    System.out.println(file);
    System.out.println(toSafeFileName(file));
    renameSafe(file);
}

我得到以下输出:

\test\-bad.folder NAME ÄÖÜßéÂÌ\.bad folder 2\test filename-ÄÖÜ.txt
\test\_bad_folder_name_aou-eai\_bad_folder_2\test_filename-aou.txt
Exception in thread "main" java.io.IOException: Could not rename \test\-bad.folder NAME ÄÖÜßéÂÌ to \test\_bad_folder_name_aou-eai
    at SafeFileName.renameSafe(SafeFileName.java:77)
    at SafeFileName.main(SafeFileName.java:90)

前两个级别,一切都按原样重命名;到达叶子文件的祖父母,renameTo()突然返回false

所以我的问题是,我做错了什么?我尝试使用其他文件名(包括100%输入文件名),但似乎File.renameTo()似乎无法重命名包含其他目录的目录。但是,我个人的赌注是我自己的愚蠢,配上一些模糊的API细节。

编辑:

好的,这是SSCCE:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class RenameTest
{
    public static File toSafeFileName(File file) {
        File safe = new File(file.getName().replace("bad", "good"));

        for (;;) {
            file = file.getParentFile();
            if (file == null) {
                return safe;
            }

            if (file.toString().equals(File.separator)) {
                safe = new File("", safe.getPath());
            } else {
                safe = new File(
                        file.getName().replace("bad", "good"),
                        safe.getPath());
            }
        }
    }

    public static File renameSafe(File unsafe) throws IOException {
        if (!unsafe.exists()) {
            throw new FileNotFoundException(unsafe.toString());
        }

        File safe = toSafeFileName(unsafe);
        File origSafe = safe;

        while (unsafe != null && !unsafe.equals(safe)) {
            File unsafeParent = unsafe.getParentFile();
            File safeTarget = new File(unsafeParent, safe.getName());

            System.out.print(unsafe + " -> " + safeTarget + "? ");

            if (unsafe.renameTo(safeTarget)) {
                System.out.println("OK.");
            } else {
                System.out.println("Error!");
                throw new IOException();
            }

            unsafe = unsafeParent;
            safe = safe.getParentFile();
        }

        return origSafe;
    }

    public static void main(String[] args) throws IOException {
        File unsafePath = new File("\\test\\bad1\\bad2\\bad.txt");
        if (!unsafePath.getParentFile().mkdirs()) {
            throw new IOException("can't create " + unsafePath.getParentFile());
        }
        if (!unsafePath.createNewFile()) {
            throw new IOException("can't create dummy file");
        }

        File safePath = renameSafe(unsafePath);
        if (safePath.exists()) {
            System.out.println("Renamed " + unsafePath + " to " + safePath);
        } else {
            throw new IOException("Safe path " + safePath + " does not exist.");
        }
    }
}

首次运行时,使用干净的D:\test目录,一切运行正常:

\test\bad1\bad2\bad.txt -> \test\bad1\bad2\good.txt? OK.
\test\bad1\bad2 -> \test\bad1\good2? OK.
\test\bad1 -> \test\good1? OK.
Renamed \test\bad1\bad2\bad.txt to \test\good1\good2\good.txt

没关系,Java 可以重命名包含目录的目录。

但是,在第二次运行时(首先没有清除D:\test),我得到以下内容:

\test\bad1\bad2\bad.txt -> \test\bad1\bad2\good.txt? OK.
\test\bad1\bad2 -> \test\bad1\good2? OK.
\test\bad1 -> \test\good1? Error!
Exception in thread "main" java.io.IOException
    at funky.core.io.RenameTest2.renameSafe(RenameTest2.java:46)
    at funky.core.io.RenameTest2.main(RenameTest2.java:65)

所以似乎问题确实是我没有清理我的测试目录,并且Java无法将目录重命名为已存在的目录 - 因为good1已经是在第一次运行时创建...正如renameTo() API中所述,这确实只是我自己的愚蠢。抱歉浪费你的时间。

1 个答案:

答案 0 :(得分:2)

对我来说,这......

File unsafeParent = unsafe.getParentFile();
File safeTarget = new File(unsafeParent, safe.getName());

因此,使用\test\-bad.folder NAME ÄÖÜßéÂÌ\.bad folder 2\test filename-ÄÖÜ.txt作为基本路径,unsafeParent将等于\test\-bad.folder NAME ÄÖÜßéÂÌ\.bad folder 2,但safeTarget现在为unsafeParent + safe.getName(),因此您不会尝试重命名目录,但unsafeParent中的文件名为safe.getName() ...

而不是自下而上,自上而下。这意味着您可以重命名目录并使用重命名的引用,列出其中的文件并进行处理。