JAVA正则表达式过滤文件的实现方法-创新互联

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 fileFilter = new DirectoryStream.Filter() { 
 @Override 
 public boolean accept(Path entry) throws IOException { 
  return matcher.matches(entry.getFileName()) && !Files.isDirectory(entry); 
 } 
}; 
 
List result = Lists.newArrayList(); 
try (DirectoryStream 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()); 
}