Reading sub-directories of a directory in class path resources with Spring Boot

Question

I was trying to read sub-directories(names of directories) of a directory in my class path resources using Spring Boot with snippet given below.

 public List<File> getSubdirectories() { File file = ResourceUtils.getFile("classpath:/database/scripts"); return Arrays.stream(file.listFiles()).filter(File::isDirectory).map(File::getFileName) .collect(Collectors.toList()); }

Now this would work well when we run this code from IDE. But when we build this app as a jar and runs it from there it throws a FileNotFoundException.

I tried to load the directory as class path resource as well. But didn't find any luck.

I'm currently using Java 8. So most of the Java 7 solutions won't work I guess. Is there any other way I can resolve this issue?

Alisher · Accepted Answer · 2020-04-09 10:06:23Z

1

As per Spring documentation ResourceUtils are to be used internally within the framework

Try using Resource instead:

@Value("classpath:database/scripts") Resource directories;

Alternatively, you can use resource loader:

@Autowired ResourceLoader resourceLoader; ... public Resource loadDirectories() { return resourceLoader.getResource( "classpath:database/scripts"); }

answered Apr 9, 2020 at 10:06

Alisher

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6 Comments

Sachin Over a year ago

This won't work well as I need child directory names of the parent directory.

Alisher Over a year ago

Why not? Resource has getFile() method. You can check later if that file is directory and list everything like this List<String> result = new ArrayList<>(); search(".*\\.java", directories.getFile(), result);

Alisher Over a year ago

I just realized you wrote the parent directory. Why not then just get the resource 'database'?

Sachin Over a year ago

We can do this while we use an IDE. But from a JAR file this will fail. It will throw a file not found exception.

Alisher Over a year ago

Have you checked if your directories actually exist inside your jar?

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