java.util.jar.JarEntry#STORED源码实例Demo

private static JarEntry newJarEntry(Entry entry) {
    final JarEntry result = new JarEntry(entry.getName());
    if (result.getCreationTime() != null) {
        result.setCreationTime(entry.getCreationTime());
    }
    if (result.getLastModifiedTime() != null) {
        result.setLastModifiedTime(entry.getLastModifiedTime());
    }
    if (entry.getExtra() != null) {
        result.setExtra(entry.getExtra());
    }
    if (result.getComment() != null) {
        result.setComment(entry.getComment());
    }
    if (!entry.isDirectory()) {
        final int method = entry.getMethod();
        if (method == JarEntry.STORED || method == ZipEntry.DEFLATED) {
            result.setMethod(method);
        }
    }
    return result;
}
 

/**
 * Writes an entry with specific contents to the jar. Directory entries must include the trailing
 * '/'.
 */
protected void writeEntry(JarOutputStream out, String name, byte[] content) throws IOException {
  if (names.add(name)) {
    // Create a new entry
    JarEntry entry = new JarEntry(name);
    entry.setTime(newEntryTimeMillis(name));
    int size = content.length;
    entry.setSize(size);
    if (size == 0) {
      entry.setMethod(JarEntry.STORED);
      entry.setCrc(0);
      out.putNextEntry(entry);
    } else {
      entry.setMethod(storageMethod);
      if (storageMethod == JarEntry.STORED) {
        CRC32 crc = new CRC32();
        crc.update(content);
        entry.setCrc(crc.getValue());
      }
      out.putNextEntry(entry);
      out.write(content);
    }
    out.closeEntry();
  }
}
 

/**
 * Writes a standard Java manifest entry into the JarOutputStream. This includes the directory
 * entry for the "META-INF" directory
 *
 * @param content the Manifest content to write to the manifest entry.
 * @throws IOException
 */
protected void writeManifestEntry(JarOutputStream out, byte[] content) throws IOException {
  int oldStorageMethod = storageMethod;
  // Do not compress small manifest files, the compressed one is frequently
  // larger than the original. The threshold of 256 bytes is somewhat arbitrary.
  if (content.length < 256) {
    storageMethod = JarEntry.STORED;
  }
  try {
    writeEntry(out, MANIFEST_DIR, new byte[] {});
    writeEntry(out, MANIFEST_NAME, content);
  } finally {
    storageMethod = oldStorageMethod;
  }
}
 

/**
 * Copies file or directory entries from the file system into the jar. Directory entries will be
 * detected and their names automatically '/' suffixed.
 */
protected void copyEntry(JarOutputStream out, String name, Path path) throws IOException {
  if (!names.contains(name)) {
    if (!Files.exists(path)) {
      throw new FileNotFoundException(path.toAbsolutePath() + " (No such file or directory)");
    }
    boolean isDirectory = Files.isDirectory(path);
    if (isDirectory && !name.endsWith("/")) {
      name = name + '/'; // always normalize directory names before checking set
    }
    if (names.add(name)) {
      if (verbose) {
        System.err.println("adding " + path);
      }
      // Create a new entry
      long size = isDirectory ? 0 : Files.size(path);
      JarEntry outEntry = new JarEntry(name);
      long newtime =
          normalize ? normalizedTimestamp(name) : Files.getLastModifiedTime(path).toMillis();
      outEntry.setTime(newtime);
      outEntry.setSize(size);
      if (size == 0L) {
        outEntry.setMethod(JarEntry.STORED);
        outEntry.setCrc(0);
        out.putNextEntry(outEntry);
      } else {
        outEntry.setMethod(storageMethod);
        if (storageMethod == JarEntry.STORED) {
          // ZipFile requires us to calculate the CRC-32 for any STORED entry.
          // It would be nicer to do this via DigestInputStream, but
          // the architecture of ZipOutputStream requires us to know the CRC-32
          // before we write the data to the stream.
          byte[] bytes = Files.readAllBytes(path);
          CRC32 crc = new CRC32();
          crc.update(bytes);
          outEntry.setCrc(crc.getValue());
          out.putNextEntry(outEntry);
          out.write(bytes);
        } else {
          out.putNextEntry(outEntry);
          Files.copy(path, out);
        }
      }
      out.closeEntry();
    }
  }
}
 

/**
 * Enables or disables compression for the Jar file entries.
 *
 * @param compression if true enables compressions for the Jar file entries.
 */
public void setCompression(boolean compression) {
  storageMethod = compression ? JarEntry.DEFLATED : JarEntry.STORED;
}