How to check a file if exists with wildcard in Java?

Question

I have a directory, and inside it are files are named \"a_id_XXX.zip\".

How do check if a file exists given an id and File dir

Answer 1

Using Java 8 find all files in directory and sub directory with required regex condition

My condition is to find all files with Audit_Report_xxxxxx.xls

// get List of Audit Report file in directory and sub directory
public List<String> getAuditReporFile(String baseDirectory) throws Exception{

    // select all available files in directory and subdirectory
    return Files.walk(Paths.get(baseDirectory))
            .filter(Files::isRegularFile).filter(x-> {

                // use regex and check if file name is according to our requirement
                return Pattern.compile("Audit_Report_.*\\.xls").matcher(x.getFileName().toString()).find();

            }).map(x->x.getFileName().toString()).collect(Collectors.toList());
}