Java 无法打开文件名中包含代理 Unicode 值的文件？
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Java Can't Open a File with Surrogate Unicode Values in the Filename?
提问by Bear
I'm dealing with code that does various IO operations with files, and I want to make it able to deal with international filenames. I'm working on a Mac with Java 1.5, and if a filename contains Unicode characters that require surrogates, the JVM can't seem to locate the file. For example, my test file is:
我正在处理对文件执行各种 IO 操作的代码，我想让它能够处理国际文件名。我正在使用 Java 1.5 的 Mac 上工作，如果文件名包含需要代理的 Unicode 字符，则 JVM 似乎无法找到该文件。例如，我的测试文件是：
"草鷗外.gif"which gets broken into the Java characters \u8349\uD85B\uDFF6\u9DD7\u5916.gif
"草鷗外.gif"它被分解成 Java 字符 \u8349\uD85B\uDFF6\u9DD7\u5916.gif
If I create a file from this filename, I can't open it because I get a FileNotFound exception. Even using this on the folder containing the file will fail:
如果我从此文件名创建文件，则无法打开它，因为出现 FileNotFound 异常。即使在包含文件的文件夹上使用它也会失败：
File[] files = folder.listFiles();
for (File file : files) {
if (!file.exists()) {
System.out.println("Failed to find File"); //Fails on the surrogate filename
}
}
Most of the code I am actually dealing with are of the form:
我实际处理的大部分代码都是以下形式：
FileInputStream instream = new FileInputStream(new File("草鷗外.gif"));
// operations follow
Is there some way I can address this problem, either escaping the filenames or opening files differently?
有什么方法可以解决这个问题，要么转义文件名，要么以不同方式打开文件？
回答by bobince
I suspect one of Java or Mac is using CESU-8instead of proper UTF-8. Java uses “modified UTF-8” (which is a slight variation of CESU-8) for a variety of internal purposes, but I wasn't aware it could use it as a filesystem/defaultCharset. Unfortunately I have neither Mac nor Java here to test with.
我怀疑 Java 或 Mac 之一正在使用CESU-8而不是正确的 UTF-8。Java 使用“修改后的 UTF-8”（这是 CESU-8 的一个轻微变体）用于各种内部目的，但我不知道它可以将它用作文件系统/defaultCharset。不幸的是，我这里既没有 Mac 也没有 Java 可以测试。
“Modified” is a modified way of saying “badly bugged”. Instead of outputting a four-byte UTF-8 sequence for supplementary (non-BMP) characters like
