Paths类

public static void pathTest(){        Path path = Paths.get("~");        System.out.println(path);        System.out.println(path.getNameCount());        System.out.println(path.getRoot());        Path absolutePath = path.toAbsolutePath();        System.out.println(absolutePath);        System.out.println(absolutePath.getNameCount());        System.out.println(absolutePath.getFileSystem());        //依次打印父路径        absolutePath.forEach(name->System.out.println(name));    }

Files类 ,这个是重点

public static void filesTest() throws FileNotFoundException, IOException{        //复制文件        Files.copy(Paths.get("abc.txt"), new FileOutputStream("testFile/abc2.txt"));        //判断是否隐藏文件        System.out.println(Files.isHidden(Paths.get("abc.txt")));        //读取文件的所有行到list        List
     
       lines = Files.readAllLines(Paths.get("abc.txt"));        lines.forEach (line -> System.out.println(line));        //文件大小        System.out.println(Files.size(Paths.get("abc.txt")));        //向文件里写入东西        List
      
        poem = new ArrayList
       
        ();        poem.add("quzhinannnnnnnnnnn曲志楠南安安那那那那那");        poem.addAll(lines);        Files.write(Paths.get("testFile/path.txt"), poem, Charset.forName("utf-8"));        //列出文件目录下的所有文件(不递归)        Files.list(Paths.get("/")).forEach(Name -> System.out.println(Name));        //打印所有文件到控制台        Files.lines(Paths.get("abc.txt"),Charset.forName("utf-8")).forEach(line -> System.out.println(line));        //查看存储空间        FileStore fs = Files.getFileStore(Paths.get("/"));        System.out.println(fs.getTotalSpace());    }
       
      
     

FileVisitor遍历文件和目录

 

public static void walkFileTree() throws IOException{        Files.walkFileTree(Paths.get("."), new SimpleFileVisitor
     
      () {                            @Override              public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {                  // TODO Auto-generated method stub                  // return super.preVisitDirectory(dir, attrs);                  System.out.println("正在访问：" + dir + "目录");                  return FileVisitResult.CONTINUE;              }                @Override              public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {                  // TODO Auto-generated method stub                  // return super.visitFile(file, attrs);                  System.out.println("\t正在访问" + file + "文件");                  if (file.endsWith("LearnIO.java")) {                      System.out.println("******找到目标文件LearnIO.java******");                      return FileVisitResult.TERMINATE; // 找到了就终止                  }                return FileVisitResult.CONTINUE; // 没找到继续找              }          });  ;    }
     

 使用WatchService监控文件变化

private static void WatchServiceTest() throws IOException, InterruptedException {        // TODO Auto-generated method stub        WatchService watchService = FileSystems.getDefault().newWatchService();        Paths.get(".").register(watchService,                StandardWatchEventKinds.ENTRY_CREATE,                StandardWatchEventKinds.ENTRY_DELETE,                StandardWatchEventKinds.ENTRY_MODIFY                );        while(true){            //获取下一个文件的变化事件            WatchKey key = watchService.take();            for(WatchEvent
      event : key.pollEvents()){                System.out.println(event.context()+"文件发生了"                        +event.kind()+"事件");            }            //重设WatchKey            boolean valid = key.reset();            //如果重设失败,退出监听            if(!valid){                break;            }        }    }

访问文件属性,这个感觉用的不多,用到时再来看吧.