Extract some content from jar-file downloaded with JWS

Question

im trying to extract some files from a jar-file downloaded using java-webstart. below code was used to locate the jar and initiate the FileSystem

1 final Protect         


        

Answer 1

Below is an implementation of your idea Andrew, it utilizes a DirUtil package I found here: http://codingjunkie.net/java-7-copy-move/

public class Zipper {

    private static final String TEMP_FILE_PREFIX = "temp-";
    private static final String TEMP_FILE_SUFIX = ".jar";

    private Logger logger = Logger.getLogger(getClass().getName());

    public Path extractProgram(String locationOfEmbeddedJar, String installDir) {
        Path installPath = null;
        try {
            installPath = Paths.get(installDir);
            if (Files.isDirectory(installPath)) {
                logger.warn("program already installed");
            } else {
                installPath = Files.createDirectory(installPath);
                Path tempJar = Files.createTempFile(TEMP_FILE_PREFIX,
                        TEMP_FILE_SUFIX);
                this.extractEmbeddedJar(locationOfEmbeddedJar, tempJar.toFile());

                logger.warn("in jarfile");
                // in jar file
                FileSystem fs = FileSystems.newFileSystem(tempJar, null);
                Path programPath = fs.getPath("/");

                logger.warn("programPath=" + programPath + " fileSystem="
                        + programPath.getFileSystem());

                DirUtils.copy(programPath, installPath);
            }
        } catch (IOException e) {
            logger.warn(e);
        }

        return (installPath);

    }

    private void extractEmbeddedJar(String locationOfEmbeddedJar,
            File locationOfTargetJar) {
        logger.warn("extractEmbeddedJar() " + locationOfEmbeddedJar);
        ClassLoader loader = this.getClass().getClassLoader();

        InputStream inputStream = loader
                .getResourceAsStream(locationOfEmbeddedJar);
        try {
            OutputStream out = new FileOutputStream(locationOfTargetJar);
            byte buf[] = new byte[1024];
            int len;
            while ((len = inputStream.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            out.close();
            inputStream.close();

        } catch (IOException e) {
            logger.warn(e);
        }
    }
}