1、獲取單個屬性並已經知道該屬性的名稱
Object size = Files.getAttribute(Paths.get(dirAbsolutePath + "/" + filename), "size");
2、獲取多個屬性,對屬性名稱不太熟悉
BasicFileAttributeView fileAttributeView = Files.getFileAttributeView(Paths.get(dirAbsolutePath + "/" + filename), BasicFileAttributeView.class);
BasicFileAttributes basicFileAttributes = fileAttributeView.readAttributes();
long size = basicFileAttributes.size();