如何检查文件夹是否存在 [英] How to check if a folder exists

问题描述

我正在使用新的Java 7 IO功能，实际上我试图接收文件夹的所有xml文件。但是当文件夹不存在时会引发异常，如何检查该文件夹是否与新IO一起存在？

I am playing a bit with the new Java 7 IO features, actually I trying to receive all the xml files of a folder. But this throws an exception when the folder does not exist, how can I check if the folder exists with the new IO?

public UpdateHandler(String release) {
    log.info("searching for configuration files in folder " + release);
    Path releaseFolder = Paths.get(release);
    try(DirectoryStream<Path> stream = Files.newDirectoryStream(releaseFolder, "*.xml")){

        for (Path entry: stream){
            log.info("working on file " + entry.getFileName());
        }
    }
    catch (IOException e){
        log.error("error while retrieving update configuration files " + e.getMessage());
    }


}

推荐答案

使用 java.nio.file.Files ：

Path path = ...;

if (Files.exists(path)) {
    // ...
}

您可以选择传递此方法 LinkOption 值：

You can optionally pass this method LinkOption values:

if (Files.exists(path, LinkOption.NOFOLLOW_LINKS)) {

还有一种方法 notExists ：

if (Files.notExists(path)) {

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