这篇文章主要介绍了JAVA正则表达式过滤文件的实现方法的相关资料,希望通过本文大家能够掌握理解这部分内容,需要的朋友可以参考下
JAVA正则表达式过滤文件的实现方法
正则表达式过滤文件列表,听起来简单,如果用java实现,还真需要一番周折,本文简析2种方式
1、适用于路径确定,文件名时正则表达式的情况(jdk6的写法)
String filePattern = "/data/logs/.+\\.log"; File f = new File(filePattern); File parentDir = f.getParentFile(); String regex = f.getName(); FileSystem FS = FileSystems.getDefault(); final PathMatcher matcher = FS.getPathMatcher("regex:" + regex); DirectoryStream.Filter<Path> fileFilter = new DirectoryStream.Filter<Path>() { @Override public boolean accept(Path entry) throws IOException { return matcher.matches(entry.getFileName()) && !Files.isDirectory(entry); } }; List<File> result = Lists.newArrayList(); try (DirectoryStream<Path> stream = Files.newDirectoryStream(parentDir.toPath(), fileFilter)) { for (Path entry : stream) { result.add(entry.toFile()); } } catch (IOException e) { e.printStackTrace(); } for(File file : result) { System.out.println(file.getParent() + "/" + file.getName()); }
2、适用于路径确定,文件名正则表达式的情况,这种正则表达式是JAVA支持的表达式,而非系统(unix)文件系统表达式(jdk8写法)
Path path = Paths.get("/data/logs"); Pattern pattern = Pattern.compile("^.+\\.log"); List<Path> paths = Files.walk(path).filter(p -> { //如果不是普通的文件,则过滤掉 if(!Files.isRegularFile(p)) { return false; } File file = p.toFile(); Matcher matcher = pattern.matcher(file.getName()); return matcher.matches(); }).collect(Collectors.toList()); for(Path item : paths) { System.out.println(item.toFile().getPath()); }
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