java.nio.file.attribute.BasicFileAttributeView#readAttributes ( )源码实例Demo

/**
 * 获取文件创建时间
 *
 * @param srcPath 文件绝对路径
 * @return 时间
 */
public static Date getCreateTime(String srcPath) {
    Path path = Paths.get(srcPath);
    BasicFileAttributeView basicview = Files.getFileAttributeView(path, BasicFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
    BasicFileAttributes attr;
    try {
        attr = basicview.readAttributes();
        Date createDate = new Date(attr.creationTime().toMillis());
        return createDate;
    } catch (Exception e) {
        e.printStackTrace();
    }
    Calendar cal = Calendar.getInstance();
    cal.set(1970, 0, 1, 0, 0, 0);
    return cal.getTime();
}
 

/**
 * 获取文件创建时间
 *
 * @param srcPath 文件绝对路径
 *
 * @return 时间
 */
public static Date getCreateTime(String srcPath) {
    final Path path = Paths.get(srcPath);
    final BasicFileAttributeView basicview = Files.getFileAttributeView(path, BasicFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
    BasicFileAttributes attr;
    try {
        attr = basicview.readAttributes();
        final Date createDate = new Date(attr.creationTime().toMillis());
        return createDate;
    } catch (Exception e) {
        e.printStackTrace();
    }
    final Calendar cal = Calendar.getInstance();
    cal.set(1970, 0, 1, 0, 0, 0);
    return cal.getTime();
}
 

/**
 * 获取文件创建时间
 *
 * @param srcPath 文件绝对路径
 * @return 时间
 */
public static Date getCreateTime(String srcPath) {
    Path path = Paths.get(srcPath);
    BasicFileAttributeView basicview = Files.getFileAttributeView(path, BasicFileAttributeView.class,
            LinkOption.NOFOLLOW_LINKS);
    BasicFileAttributes attr;
    try {
        attr = basicview.readAttributes();
        Date createDate = new Date(attr.creationTime().toMillis());
        return createDate;
    } catch (Exception e) {
        e.printStackTrace();
    }
    Calendar cal = Calendar.getInstance();
    cal.set(1970, 0, 1, 0, 0, 0);
    return cal.getTime();
}
 

/**
 * 输入文件路径，返回这个文件的创建时间
 * @param filePath 要获取创建时间的文件的路径，绝对路径
 * @return 此文件创建的时间
 */
public static Date getCreateTime(String filePath){  
	Path path=Paths.get(filePath);    
	BasicFileAttributeView basicview=Files.getFileAttributeView(path, BasicFileAttributeView.class,LinkOption.NOFOLLOW_LINKS );  
	BasicFileAttributes attr;  
	try {
		attr = basicview.readAttributes();  
		Date createDate = new Date(attr.creationTime().toMillis());  
		return createDate;  
	} catch (Exception e) {  
		e.printStackTrace();  
	}
	Calendar cal = Calendar.getInstance();  
	cal.set(1970, 0, 1, 0, 0, 0);  
	return cal.getTime();  
}
 

/**
 * Get POSIX attributes for file.
 *
 * @param file File.
 * @return BasicFileAttributes.
 */
@Nullable public static BasicFileAttributes basicAttributes(File file) {
    BasicFileAttributes attrs = null;

    try {
        BasicFileAttributeView view = Files.getFileAttributeView(file.toPath(), BasicFileAttributeView.class);

        if (view != null)
            attrs = view.readAttributes();
    }
    catch (IOException e) {
        throw new IgfsException("Failed to read basic file attributes: " + file.getAbsolutePath(), e);
    }

    return attrs;
}
 

@Test
public void testGetFileAttributeViewReadAttributes() throws IOException {
    addDirectory("/foo/bar");

    SFTPFileSystemProvider provider = new SFTPFileSystemProvider();
    try (SFTPFileSystem fs = newFileSystem(provider, createEnv())) {
        SFTPPath path = new SFTPPath(fs, "/foo/bar");

        BasicFileAttributeView view = fs.provider().getFileAttributeView(path, BasicFileAttributeView.class);
        assertNotNull(view);

        BasicFileAttributes attributes = view.readAttributes();
        assertTrue(attributes.isDirectory());
    }
}
 

@Test
public void testView() throws IOException {
  BasicFileAttributeView view = provider.view(fileLookup(), NO_INHERITED_VIEWS);

  assertThat(view).isNotNull();
  assertThat(view.name()).isEqualTo("basic");

  BasicFileAttributes attrs = view.readAttributes();
  assertThat(attrs.fileKey()).isEqualTo(0);

  FileTime time = attrs.creationTime();
  assertThat(attrs.lastAccessTime()).isEqualTo(time);
  assertThat(attrs.lastModifiedTime()).isEqualTo(time);

  view.setTimes(null, null, null);

  attrs = view.readAttributes();
  assertThat(attrs.creationTime()).isEqualTo(time);
  assertThat(attrs.lastAccessTime()).isEqualTo(time);
  assertThat(attrs.lastModifiedTime()).isEqualTo(time);

  view.setTimes(FileTime.fromMillis(0L), null, null);

  attrs = view.readAttributes();
  assertThat(attrs.creationTime()).isEqualTo(time);
  assertThat(attrs.lastAccessTime()).isEqualTo(time);
  assertThat(attrs.lastModifiedTime()).isEqualTo(FileTime.fromMillis(0L));
}
 

public static void main(String[] args)
    throws InterruptedException, IOException {

    // Use 'which' to verify that 'nc' is available and skip the test
    // if it is not.
    Process proc = Runtime.getRuntime().exec("which nc");
    InputStream stdout = proc.getInputStream();
    int b = stdout.read();
    proc.destroy();
    if (b == -1) {
        System.err.println("Netcat command unavailable; skipping test.");
        return;
    }

    // Create a new sub-directory of the nominal test directory in which
    // 'nc' will create the socket file.
    String testSubDir = System.getProperty("test.dir", ".")
        + File.separator + TEST_SUB_DIR;
    Path socketTestDir = Paths.get(testSubDir);
    Files.createDirectory(socketTestDir);

    // Set the path of the socket file.
    String socketFilePath = testSubDir + File.separator
        + SOCKET_FILE_NAME;

    // Create a process which executes the nc (netcat) utility to create
    // a socket file at the indicated location.
    FileSystem fs = FileSystems.getDefault();
    try (WatchService ws = fs.newWatchService()) {
        // Watch the test sub-directory to receive notification when an
        // entry, i.e., the socket file, is added to the sub-directory.
        WatchKey wk = socketTestDir.register(ws,
                StandardWatchEventKinds.ENTRY_CREATE);

        // Execute the 'nc' command.
        proc = Runtime.getRuntime().exec(CMD_BASE + " " + socketFilePath);

        // Wait until the socket file is created.
        WatchKey key = ws.take();
        if (key != wk) {
            throw new RuntimeException("Unknown entry created - expected: "
                + wk.watchable() + ", actual: " + key.watchable());
        }
        wk.cancel();
    }

    // Verify that the socket file in fact exists.
    Path socketPath = fs.getPath(socketFilePath);
    if (!Files.exists(socketPath)) {
        throw new RuntimeException("Socket file " + socketFilePath
            + " was not created by \"nc\" command.");
    }

    // Retrieve the most recent access and modification times of the
    // socket file; print the values.
    BasicFileAttributeView attributeView = Files.getFileAttributeView(
            socketPath, BasicFileAttributeView.class);
    BasicFileAttributes oldAttributes = attributeView.readAttributes();
    FileTime oldAccessTime = oldAttributes.lastAccessTime();
    FileTime oldModifiedTime = oldAttributes.lastModifiedTime();
    System.out.println("Old times: " + oldAccessTime
        + " " + oldModifiedTime);

    // Calculate the time to which the access and modification times of the
    // socket file will be changed.
    FileTime newFileTime =
        FileTime.fromMillis(oldAccessTime.toMillis() + 1066);

    try {
        // Set the access and modification times of the socket file.
        attributeView.setTimes(newFileTime, newFileTime, null);

        // Retrieve the updated access and modification times of the
        // socket file; print the values.
        FileTime newAccessTime = null;
        FileTime newModifiedTime = null;
        BasicFileAttributes newAttributes = attributeView.readAttributes();
        newAccessTime = newAttributes.lastAccessTime();
        newModifiedTime = newAttributes.lastModifiedTime();
        System.out.println("New times: " + newAccessTime + " "
            + newModifiedTime);

        // Verify that the updated times have the expected values.
        if ((newAccessTime != null && !newAccessTime.equals(newFileTime))
            || (newModifiedTime != null
                && !newModifiedTime.equals(newFileTime))) {
            throw new RuntimeException("Failed to set correct times.");
        }
    } finally {
        // Destry the process running netcat and delete the socket file.
        proc.destroy();
        Files.delete(socketPath);
    }
}
 

/** 
 * Returns file "key" (e.g. inode) for the specified path 
 */
private Object getKey(Path existing) throws IOException {
  BasicFileAttributeView view = Files.getFileAttributeView(existing, BasicFileAttributeView.class);
  BasicFileAttributes attributes = view.readAttributes();
  return attributes.fileKey();
}
 

@BeforeClass
public static void setup() throws IOException {
    Path home = Paths.get(HOME);
    BasicFileAttributeView basicView = Files.getFileAttributeView(home, BasicFileAttributeView.class);
    basicAttribs = basicView.readAttributes();
}