>我读了如何在java中将文件附加到tar存档?,在不读取/重写整个存档的情况下将文件附加到存档,以及在不覆盖其现有内容的情况下向tar文件添加条目,但没有给出好的答案。此外,我没有足够的声誉来发表评论。所以我在这里创建了一个新问题。
有没有办法在 tar 存档中附加文件?如果文件已经存在,我想替换它。
我已经开始编写以下方法,但是添加文件时,它会删除存档内容。我没有在 apache 压缩网站上找到任何示例。
static final Logger LOG = Logger.getLogger(ShellClient.class);
public void appendFileInTarArchive(String tarPath, String tarFileName, String file2WriteName, String file2WriteContent) throws IOException {
if (tarPath == null || tarFileName == null || tarFileName.isEmpty()) {
LOG.warn("The path or the name of the tar archive is null or empty.");
return;
}
final File tarFile = new File(tarPath, tarFileName);
final File fileToAdd = new File(tarPath, file2WriteName);
FileUtils.write(fileToAdd, file2WriteContent);
if (file2WriteName == null || file2WriteName.isEmpty()) {
LOG.warn("The name of the file to append in the archive is null or empty.");
return;
}
TarArchiveOutputStream aos = null;
OutputStream out = null;
try {
out = new FileOutputStream(tarFile);
aos = (TarArchiveOutputStream) new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.TAR, out);
// create a new entry
final TarArchiveEntry entry = new TarArchiveEntry(fileToAdd);
entry.setSize(fileToAdd.length());
// add the entry to the archive
aos.putArchiveEntry(entry);
InputStream is = new FileInputStream(fileToAdd);
final int byteCopied = IOUtils.copy(is, aos);
if (LOG.isDebugEnabled()) {
LOG.debug(byteCopied+" bytes inserted in the tar archive from "+fileToAdd);
}
is.close();
aos.closeArchiveEntry();
aos.finish();
aos.flush();
aos.close();
out.flush();
out.close();
} catch (ArchiveException e) {
LOG.error(e.getMessage(), e);
} catch (IOException e) {
LOG.error(e.getMessage(), e);
} finally {
IOUtils.closeQuietly(aos);
IOUtils.closeQuietly(out);
FileUtils.deleteQuietly(fileToAdd);
}
}
最后,
我成功地使用这篇文章做到了这一点。
我创建了 tar 存档的副本,并将整个内容复制到其中。然后我删除旧的焦油存档。
public void appendFileInTarArchive(String tarPath, String tarFileName, String file2WriteName, String file2WriteContent) throws AuthenticationException, IOException {
if (tarPath == null || tarFileName == null || tarFileName.isEmpty()) {
LOG.warn("The path or the name of the tar archive is null or empty.");
return;
}
final File tarFile = new File(tarPath, tarFileName);
final File fileToAdd = new File(tarPath, file2WriteName);
FileUtils.write(fileToAdd, file2WriteContent);
if (file2WriteName == null || file2WriteName.isEmpty()) {
LOG.warn("The name of the file to append in the archive is null or empty.");
return;
}
ArchiveStreamFactory asf = new ArchiveStreamFactory();
File tempFile = new File(tarPath, "tmpTar.tar");
tempFile.createNewFile();
try {
FileInputStream fis = new FileInputStream(tarFile);
ArchiveInputStream ais = asf.createArchiveInputStream(ArchiveStreamFactory.TAR, fis);
FileOutputStream fos = new FileOutputStream(tempFile);
ArchiveOutputStream aos = asf.createArchiveOutputStream(ArchiveStreamFactory.TAR, fos);
// copy the existing entries
ArchiveEntry nextEntry;
while ((nextEntry = ais.getNextEntry()) != null) {
aos.putArchiveEntry(nextEntry);
IOUtils.copy(ais, aos);
aos.closeArchiveEntry();
}
// create the new entry
TarArchiveEntry entry = new TarArchiveEntry(file2WriteName);
entry.setSize(fileToAdd.length());
aos.putArchiveEntry(entry);
IOUtils.copy(new FileInputStream(fileToAdd), aos);
aos.closeArchiveEntry();
aos.finish();
ais.close();
aos.close();
// copies the new file over the old
tarFile.delete();
tempFile.renameTo(tarFile);
} catch (ArchiveException e) {
LOG.error(e.getMessage(), e);
} catch (IOException e) {
LOG.error(e.getMessage(), e);
} finally {
FileUtils.deleteQuietly(fileToAdd);
}
}