如何根据id和File目录检查文件是否存在?
FileFilter
(此处编码为 anonymously
)传递到dir
File
的
listFiles()
方法,如下所示:
File dir = new File("some/path/to/dir"); final String id = "XXX"; // needs to be final so the anonymous class can use it File[] matchingFiles = dir.listFiles(new FileFilter() { public boolean accept(File pathname) { return pathname.getName().equals("a_id_" + id + ".zip"); } });
捆绑为方法,它看起来像:
public static File[] findFilesForId(File dir, final String id) { return dir.listFiles(new FileFilter() { public boolean accept(File pathname) { return pathname.getName().equals("a_id_" + id + ".zip"); } }); }
你可以称之为:
File[] matchingFiles = findFilesForId(new File("some/path/to/dir"), "XXX");
或者只是检查是否存在,
boolean exists = findFilesForId(new File("some/path/to/dir"), "XXX").length > 0
翻译自:https://stackoverflow.com/questions/8752034/how-to-check-a-file-if-exists-with-wildcard-in-java