I'm java beginner, I need something like this:
String2GzipFile (String file_content, String file_name)
String2GzipFile("Lorem ipsum dolor sit amet, consectetur adipiscing elit.", "lorem.txt.gz")
I cant figure out how to do that.
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3 Answers
There are two orthogonal concepts here:
- Converting text to binary, typically through an
OutputStreamWriter - Compressing the binary data, e.g. using
GZIPOutputStream
So in the end you'll want to:
- Create an
OutputStreamwhich writes to wherever you want the result (e.g. a file or in memory via aByteArrayOutputStream - Wrap that
OutputStreamin aGZIPOutputStream - Wrap the
GZIPOutputStreamin anOutputStreamWriterusing an appropriate charset (e.g. UTF-8) - Write the text to the
OutputStreamWriter - Close the writer, which will flush and close everything else.
For example:
FileOutputStream output = new FileOutputStream(fileName);
try {
Writer writer = new OutputStreamWriter(new GZIPOutputStream(output), "UTF-8");
try {
writer.write(text);
} finally {
writer.close();
}
} finally {
output.close();
}
Note that I'm closing output even if we fail to create the writer, but we still need to close writer if everything is successful, in order to flush everything and finish writing the data.
3 Comments
Luistar15
I was trying using ByteArrayOutputStream, but your example works perfectly. Thank you
Jon Skeet
@user752679: I originally wrote out a sample using ByteArrayOutputStream, but as your question says you want to write it to a file...
prayagupadhyay
note: dont forget to close the
streamWriter or else you will get unexpected EOF while trying to open up *.gzip - stackoverflow.com/a/12100352/432903Same solution as Jon, just used try with resources
try (FileOutputStream output = new FileOutputStream("filename.gz");
Writer writer = new OutputStreamWriter(new GZIPOutputStream(output), "UTF-8")) {
writer.write("someText");
}
1 Comment
Walter Tross
also, it's probably preferrable to use
StandardCharsets.UTF_8 instead of "UTF-8"Have a look at GZIPOutputStream - you should be able to use this in exactly the same way as any other outputstream to write to a file - it'll just automatically write it in the gzip compressed format.
