I know that there are plenty of ways to do this, however I'm experiencing problems in this task which I can't solve with the solutions that I have already found.
First of, I don't want to read a specific file inside a jar: I want to read all the files contained in a directory inside the jar given the path of the directory. That said, with a bit of researches I found out how to do this and I wrote a test code.
public class StringLocalizer { private final List<URL> files; public StringLocalizer(final String stringsDirectory) throws URISyntaxException, IOException { ClassLoader loader = Thread.currentThread().getContextClassLoader(); final BufferedReader br = new BufferedReader(new InputStreamReader(loader.getResourceAsStream(stringsDirectory), StandardCharsets.UTF_8)); files = br.lines() .map(l -> stringsDirectory + "/" + l) .map(loader::getResource) .collect(Collectors.toList()); // This line has the debug purpose of showing all the url contained in the list System.out.println(Arrays.toString(files.toArray(new URL[files.size()]))); } public static void main(String[] args) { try { new StringLocalizer("test/testDirectory/"); } catch (URISyntaxException | IOException e) { e.printStackTrace(); } } } First I tried the code in my IDE (Eclipse) and I got this output:
[file:/C:/Users/*my_user_name*/neon/workspace/JavaStringLocalizer/bin/test/testDirectory//test.xml] The code works well, this was my first thought, however when I tried to package the program inside a runnable JAR file I got an unexpected output:
[] Why is the list empty even if the file is packaged in the JAR file?
(The correct output should be a representation of an array containing all the files in the given directory, like the first output)
EDIT: To understand better my situation I have this files:
>MyJar.jar >classFiles >test>testDirectory>test.xml // I want to get this file NOTE: this directory will contain more files, so I don't want to access them statically but I want to dynamically read all the files
EDIT: Code to extract the files using the ZipFile:
public class StringLocalizer { private final List<ZipEntry> files = new ArrayList<ZipEntry>(); public StringLocalizer(final String stringsDirectory) throws URISyntaxException, IOException { URL jarUrl = getClass().getProtectionDomain().getCodeSource().getLocation(); File jarFile = new File(jarUrl.toURI().getPath()); ZipFile unzipper = new ZipFile(jarFile, ZipFile.OPEN_READ); ZipEntry dirEntry = unzipper.getEntry(stringsDirectory); Enumeration<? extends ZipEntry> entries = unzipper.entries(); for(ZipEntry entry = entries.nextElement(); entries.hasMoreElements(); entry = entries.nextElement()) { if(entry.getName().startsWith(dirEntry.getName()) && !entry.getName().equals(dirEntry.getName())) { files.add(entry); } System.out.println(entry.getName()); } System.out.println(Arrays.toString(files.toArray(new ZipEntry[files.size()]))); unzipper.close(); } public static void main(String[] args) { try { new StringLocalizer("test/testDirectory/"); } catch (URISyntaxException | IOException e) { e.printStackTrace(); } } } Why is the last entry ignored?
