如何在JDK7中使用目录通配符 [英] How do I use directory globbing in JDK7

问题描述

我一直在尝试在JDK7中使用新的globbing功能，从文档和示例开始

I have been trying to use the new globbing feature in JDK7, starting from the documentation and examples

我可以使用glob：*。dat这样的小数据来处理

I can get globs such as "glob:*.dat" to work with the

Files.walkFileTree(startingDir, finder);

示例但我无法获得**语法工作。我希望能够创建类似的东西：

example but I have been unable to get the "**" syntax working. I would like to be able to create something like:

matcher = FileSystems.getDefault().getPathMatcher("glob:" + "foo/**/bar/*.dat");

并会感谢一个简单的例子。我正在使用Windows 7.

and would be grateful for a simple example. I am using Windows 7.

更新：
@Oleg和@JBNizet明确指出/语法与操作系统无关。请注意 Javadocs 建议依赖操作系统的语法也是可能的（？需要）

UPDATE: @Oleg and @JBNizet make it clear that the "/" syntax is OS-independent. Note that the Javadocs suggest that OS-dependent syntax is also possible (?required)

仍然存在问题：
已经采取@Nizet并编辑如下：

STILL PROBLEMS: Have taken @Nizet and edited as follows:

@Test
public void testStackoverflowGlobber() throws IOException {
    final PathMatcher matcher =
 FileSystems.getDefault().getPathMatcher("glob:*.cml");
        Files.walkFileTree(Paths.get("d:/petermr-workspace/jumbo-converters/jumbo-converters-cli/src/test/resources"), new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                System.out.println("try>> "+file);
                if (matcher.matches(file)) {
                    System.out.println("MATCHES>>"+file);
                }
                return FileVisitResult.CONTINUE;
            }
        @Override
        public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
            return FileVisitResult.CONTINUE;
        }
    });
}

这会产生如下输出：

try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cdx\r19.cdx
try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cdx\r19.cdxml
try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cdx\r19.cml
try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cdx\r19.ref.cdxml
try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cdx\r19.ref.cml
try>> d:\petermr-workspace\jumbo-converters\jumbo-converters-cli\src\test\resources\examples\cif\aa2004.cml

但没有匹配的证据

推荐答案

这是一个工作示例，显示 d：/ 的任何后代目录中的所有zip文件：

Here's a working example which displays all the zip files in any descendant directory of d:/:

public static void main(String[] args) throws IOException {
    final PathMatcher matcher = FileSystems.getDefault().getPathMatcher("glob:d:/**/*.zip");
    Files.walkFileTree(Paths.get("d:/"), new SimpleFileVisitor<Path>() {
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            if (matcher.matches(file)) {
                System.out.println(file);
            }
            return FileVisitResult.CONTINUE;
        }

        @Override
        public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
            return FileVisitResult.CONTINUE;
        }
    });
}

如您所见，使用正斜杠适用于Windows。

As you see, using forward slashes works on Windows.

这篇关于如何在JDK7中使用目录通配符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！