[英]Java gzip - GZIPOutputStream not closing / compressing arbitrarily
With the help of this thread I was able to write a decompress()
and a compress()
function. 借助该线程,我能够编写一个
decompress()
和compress()
函数。 My programme receives data in gzipped form, inflates it, sometimes modifies it, then re-compresses it again and sends it along. 我的程序以gzip压缩形式接收数据,对其进行膨胀,有时对其进行修改,然后再次对其进行重新压缩并发送。 After hours of headache and bug tracing, I was able to find out that sometimes(!) , the
GZIPOutputStream
that I use just won't close properly. 经过数小时的头痛和错误跟踪,我发现有时候(!) ,我使用的
GZIPOutputStream
无法正确关闭。 I am able to flush it but after that, nothing happens. 我可以冲洗它,但是此后什么也没发生。 However, at other times, it simply works >.>
但是,在其他时候,它只是可以正常工作。
This is the code of my compress()
method. 这是我的
compress()
方法的代码。
public static byte[] compress(String data) throws IOException {
try (PipedInputStream pipedIn = new PipedInputStream();
GZIPOutputStream compressor= new GZIPOutputStream(new PipedOutputStream(pipedIn))) {
compressor.write(data.getBytes("UTF-8"));
compressor.flush();
compressor.close();
// Sometimes does not reach this point.
return IOUtils.toByteArray(pipedIn);
}
}
For debugging purposes, I added a few System.Outs. 为了调试,我添加了一些System.Outs。 The console output was as follows:
控制台输出如下:
------------------------------------
Decompressing ...
compressed byte count: 628
uncompressed byte count: 1072
------------------------------------
Compressing ...
uncompressed byte count: 1072
compressed byte count: 628
------------------------------------
>>> That worked!
------------------------------------
Decompressing ...
compressed byte count: 526
uncompressed byte count: 2629
------------------------------------
uncompressed byte count: 2629
compressed byte count: 526
------------------------------------
>>> That worked!
------------------------------------
Decompressing ...
compressed byte count: 1888
uncompressed byte count: 6254
------------------------------------
After that, nothing happens. 在那之后,什么也没有发生。 Any help with this problem would be greatly appreciated!
任何有关此问题的帮助将不胜感激!
There is probably nothing wrong with your usage of GZIP streams; 您对GZIP流的使用可能没有错; rather it is the way you use the Piped streams.
而是使用管道流的方式。 These are meant for interthread communication and will block when you use them your way.
这些是用于线程间通信的,在您按自己的方式使用它们时会阻塞。
Instead use a ByteArrayOutptuStream
to capture the output. 而是使用
ByteArrayOutptuStream
捕获输出。
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