Java Path中的星号 [英] Asterisks in Java Path
问题描述
我正在浏览OCA / OCP Java SE&程序员I& II学习指南。在页520上有一个用于匹配的方法：
I am going through the OCA/OCP Java SE & Programmer I & II Study Guide. On page 520 there is a method to use for matching:
public void matches(Path path, String glob){
PathMatcher matcher = FileSystems.getDefault().getPathMatcher(glob);
System.out.println(matcher.matches(path));
}
现在，在下一页上有一段代码可供使用这个方法：
Now, on the next page there is a piece of code that makes use of this method:
public static void main(String [] args){
Path path1= Paths.get("0*b/test/1");
Path path2 = Paths.get("9\\*b/test/1");
Path path3 = Paths.get("01b/test/1");
Path path4 = Paths.get("0*b/1");
String glob = "glob:[0-9]\\*{A*,b}/**/1";
matches(path1,glob);
matches(path2,glob);
matches(path3,glob);
matches(path4,glob);
}
根据该书，结果应为：
true
false
false
false
According to the book the result should be: true false false false
然而，当我尝试运行它时，我得到以下异常：
However, when I attempt to run it I get the following exception:
Exception in thread "main" java.nio.file.InvalidPathException: Illegal char <*> at index 1: 0*b/test/1
at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
at java.nio.file.Paths.get(Paths.java:84)
at pathmatcherobjective.PathMatcherObjective.main(PathMatcherObjective.java:63)
Java Result: 1
我的问题是：我错过了什么设置？我是否需要启用特定功能才能运行此功能？或者这本书错了吗？我只是在学习Java专业考试，所以我不确定。
My question is: Have I missed something in the set up? Do I need to have something specific enabled in order to run this? Or is the book just wrong? I am only studying for the Java Professional exam so I'm not sure on everything.
推荐答案
在Windows操作系统上，字符 * 不允许有效文件和目录名称。 Microsoft Developer Network ：
On windows operating system the character * is not allowed for valid file and directory names. So do the characters listed on the Microsoft Developer Network:
您可以使用当前代码页中的任何字符作为名称，
包括扩展名中的Unicode字符和字符字符
设置（128-255），以下保留字符除外：
You can use any character in the current code page for a name, including Unicode characters and characters in the extended character set (128–255), except for the following reserved characters:
- < （小于）
- >（大于）
- :(冒号）
- （双引号） ）
- /（正斜杠）
- \（反斜杠）
- |（竖线或竖线） ）
- ？（问号）
- *（星号）
- 整数值零，有时指作为ASCII NUL字符。
- 整数表示形式在1到31范围内的字符，但允许使用这些字符
的备用数据流除外。有关文件的更多信息stream，请参阅文件
Streams。 - 目标文件系统不允许的任何其他字符。
- < (less than)
- > (greater than)
- : (colon)
- " (double quote)
- / (forward slash)
- \ (backslash)
- | (vertical bar or pipe)
- ? (question mark)
- * (asterisk)
- Integer value zero, sometimes referred to as the ASCII NUL character.
- Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more information about file streams, see File Streams.
- Any other character that the target file system does not allow.
对于UNIX，请参阅维基百科。
在POSIX上允许的字符包括 A-Z a-z 0-9。_ - ，保留为 / null 。
For UNIX see Wikipedia.
On POSIX allowed characters include A–Z a–z 0–9 . _ -, reserved are / null.
可能是e在操作系统上运行的示例，其中允许 * 。
Probably the examples where run on the OS where * is allowed.
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