CODEWITHSUNDEEP
javaiozipnio
tb189
tb189

Reputation: 2012

(de)compressing files using NIO

In the many examples online, files are (de)compressed in java using a coded buffer. With NIO, however, there is no need to choose a good buffer size. I found examples for files and sockets, but is there an NIO channel for compressed input (e.g. GZIPInputStream), so you can just use transferFrom in stead of creating the byte[] buffer yourself?

Upvotes: 3

Views: 5557

Answers (2)

jarnbjo
jarnbjo

Reputation: 34323

You can use the static utility methods in java.nio.channels.Channels to wrap streams in channels and vice versa.

E.g. to create a channel, from which you can read the uncompressed data from a gzip compressed file:

FileChannel fc = 
    new RandomAccessFile("input.gz", "r").getChannel();

ReadableByteChannel gzc = 
    Channels.newChannel(
            new GZIPInputStream(
                    Channels.newInputStream(fc)));

Upvotes: 3

AlexR
AlexR

Reputation: 115378

No, specialized ZIP channel does not exist yet... I think that you can do the following. Use NIO to read from any channel you want to Buffer. Then retrieve bytes you have just read from buffer to byte array, wrap the array using ByteArrayInputStream and pass it to ZIPInputStream.

Upvotes: 3

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