我一直致力于从不同类型的文件格式中解压缩,例如"zip,tar,tbz,tgz"。除了 tbz 之外,我什么都能做,因为apache 通用压缩库提供 BZIP2 压缩器。但我需要解压缩旧的 BZIP 而不是 BZIP2。有没有办法做到这一点。我已经添加了到目前为止我已经完成的代码,用于使用下面的 apache commons 库提取不同的 tar 文件存档。
public List<ArchiveFile> processTarFiles(String compressedFilePath, String fileType) throws IOException {
List<ArchiveFile> extractedFileList = null;
TarArchiveInputStream is = null;
FileOutputStream fos = null;
BufferedOutputStream dest = null;
try {
if(fileType.equalsIgnoreCase("tar"))
{
is = new TarArchiveInputStream(new FileInputStream(new File(compressedFilePath)));
}
else if(fileType.equalsIgnoreCase("tbz")||fileType.equalsIgnoreCase("bz"))
{
is = new TarArchiveInputStream(new BZip2CompressorInputStream(new FileInputStream(new File(compressedFilePath))));
}
else if(fileType.equalsIgnoreCase("tgz")||fileType.equalsIgnoreCase("gz"))
{
is = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream(new File(compressedFilePath))));
}
TarArchiveEntry entry = is.getNextTarEntry();
extractedFileList = new ArrayList<>();
while (entry != null) {
// grab a zip file entry
String currentEntry = entry.getName();
if (!entry.isDirectory()) {
File destFile = new File(Constants.DEFAULT_ZIPOUTPUTPATH, currentEntry);
File destinationParent = destFile.getParentFile();
// create the parent directory structure if needed
destinationParent.mkdirs();
ArchiveFile archiveFile = new ArchiveFile();
int currentByte;
// establish buffer for writing file
byte data[] = new byte[(int) entry.getSize()];
// write the current file to disk
fos = new FileOutputStream(destFile);
dest = new BufferedOutputStream(fos, (int) entry.getSize());
// read and write until last byte is encountered
while ((currentByte = is.read(data, 0, (int) entry.getSize())) != -1) {
dest.write(data, 0, currentByte);
}
dest.flush();
dest.close();
archiveFile.setExtractedFilePath(destFile.getAbsolutePath());
archiveFile.setFormat(destFile.getName().split("\\.")[1]);
extractedFileList.add(archiveFile);
entry = is.getNextTarEntry();
} else {
new File(Constants.DEFAULT_ZIPOUTPUTPATH, currentEntry).mkdirs();
entry = is.getNextTarEntry();
}
}
} catch (IOException e) {
System.out.println(("ERROR: " + e.getMessage()));
} catch (Exception e) {
System.out.println(("ERROR: " + e.getMessage()));
} finally {
is.close();
dest.flush();
dest.close();
}
return extractedFileList;
}