Force flush on a GZIPOutputStream in java

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we are working on a program where we need to flush (force compress and send data) a GZIPOutputStream. The problem is, that the flush method of the GZIPOutputStream doesn't work as expected (force compress and send data), instead the Stream waits for more data for efficient data compression.

When you call finish the data is compressed and sent over the output stream but the GZIPOutputStream (not the underlying stream) will be closed so we cant write more data till we create a new GZIPOutputStream, which costs time and performance.

Hope anyone can help with this.

Best regards.

gzipoutputstream gzip java
6 Answers

as @seh said, this works great:

ByteArrayOutputStream stream = new ByteArrayOutputStream();

// the second param need to be true
GZIPOutputStream gzip = new GZIPOutputStream(stream,  true);
gzip.write( .. );
gzip.flush();

...
gzip.close()
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