java.io.IOException：写入字节的请求超过条目字节标头中的大小

Question

我正在使用GZIPOutputStream创建一个tar.Gzip文件，并且我添加了另一个逻辑，如果在压缩文件时捕获任何异常，那么我的代码将重试三次。

当我抛出一个IOException来测试我的重试逻辑时，它抛出一个下面的异常:
java.io.IOException: request to write '4096' bytes exceeds size in header of '2644' bytes for entry 'Alldbtypes'

我得到异常在行:org.apache.commons.io.IOUtils.copyLarge(inputStream, tarStream);

private class CompressionStream extends GZIPOutputStream {
    // Use compression levels from the deflator class
    public CompressionStream(OutputStream out, int compressionLevel) throws IOException {
        super(out);
        def.setLevel(compressionLevel);
    }
}
public void createTAR(){
    boolean isSuccessful=false;
    int count = 0;
    int maxTries = 3;
    while(!isSuccessful) {
        InputStream inputStream =null;
        FileOutputStream outputStream =null;
        CompressionStream compressionStream=null;
        OutputStream md5OutputStream = null;
        TarArchiveOutputStream tarStream = null;
        try{
            inputStream = new BufferedInputStream(new FileInputStream(rawfile));
            File stagingPath = new File("C:\Workarea\6d22b6a3-564f-42b4-be83-9e1573a718cd\b88beb62-aa65-4ad5-b46c-4f2e9c892259.tar.gz");
            boolean isDeleted = false;
            if(stagingPath.exists()){
                isDeleted =  stagingPath.delete();
                if(stagingPath.exists()){
                    try {
                        FileUtils.forceDelete(stagingPath);
                    }catch (IOException ex){
                        //ignore
                    }
                }
            }
            outputStream = new FileOutputStream(stagingPath);
            if (isCompressionEnabled) {
                compressionStream = new
                        CompressionStream(outputStream, getCompressionLevel(om));
            }
            final MessageDigest outputDigest = MessageDigest.getInstance("MD5");
            md5OutputStream = new DigestOutputStream(isCompressionEnabled ? compressionStream : outputStream, outputDigest);
            tarStream = new TarArchiveOutputStream(new BufferedOutputStream(md5OutputStream));
            tarStream.setLongFileMode(TarArchiveOutputStream.LONGFILE_GNU);
            tarStream.setBigNumberMode(TarArchiveOutputStream.BIGNUMBER_STAR);
            TarArchiveEntry entry = new TarArchiveEntry("Alldbtypes");
            entry.setSize(getOriginalSize());
            entry.setModTime(getLastModified().getMillis());
            tarStream.putArchiveEntry(entry);
            org.apache.commons.io.IOUtils.copyLarge(inputStream, tarStream);
            inputStream.close();
            tarStream.closeArchiveEntry();
            tarStream.finish();
            tarStream.close();
            String digest = Hex.encodeHexString(outputDigest.digest());
            setChecksum(digest);
            setIngested(DateTime.now());
            setOriginalSize(FileUtils.sizeOf(stagingPath));
            isSuccessful =true;
        } catch (IOException e) {
            if (++count == maxTries) {
                throw new RuntimeException("Exception: " + e.getMessage(), e);
            }
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(Exception("MD5 hash algo not installed.");
        } catch (Exception e) {
            throw new RuntimeException("Exception: " + e.getMessage(), e);
        } finally {
            org.apache.commons.io.IOUtils.closeQuietly(inputStream);
            try {
                tarStream.flush();
                tarStream.finish();
            } catch (IOException e) {
                e.printStackTrace();
            }
            org.apache.commons.io.IOUtils.closeQuietly(tarStream);
            org.apache.commons.io.IOUtils.closeQuietly(compressionStream);
            org.apache.commons.io.IOUtils.closeQuietly(md5OutputStream);
            org.apache.commons.io.IOUtils.closeQuietly(outputStream);
        }
    }
}

Answer 1

案件解决。当要压缩的文件大小不正确时，会抛出java.io.IOException: request to write '4096' bytes exceeds size in header of '2644' bytes for entry 'Alldbtypes'异常。

TarArchiveEntry entry = new TarArchiveEntry("Alldbtypes");
entry.setSize(getOriginalSize()); 

在我的代码中，getOriginalSize()在最后再次更新，所以在重试时，原始大小变成了变化，原始大小现在是压缩文件大小，所以它抛出了这个异常。