Java GZIPInputStream Tutorial
Jakob Jenkov |
The Java GZIPInputStream class (java.util.zip.GZIPInputStream) can be used to
decompress files that are compressed with the GZIP compression algorithm, for instance via the
GZIPOutputStream class.
Creating a GZIPInputStream
To use the Java GZIPInputStream you must first create a GZIPInputStream
instance. Here is an example of creating a GZIPInputStream instance:
InputStream fileInputStream = new FileInputStream("myfile.zip");
GZIPInputStream gzipInputStream = new GZIPInputStream(fileInputStream);
The GZIPInputStream constructor takes an InputStream as parameter.
In the example above I passed it a FileInputStream connected to a file named
myfile.zip. The GZIPInputStream will then read the GZIP'ed data in the file
and decompress it.
Reading Data From a GZIPInputStream
After creating a GZIPInputStream you can read the decompressed data from it just like
you would read data from any other InputStream. Here is an example of reading data
from a Java GZIPInputStream:
int data = gzipInputStream.read();
while(data != -1){
//do something with data
data = gzipInputStream.read();
}
Closing a GZIPInputStream
When you are finished reading data from the GZIPInputStream you should close it
using its close() method. Here is a Java example of closing a GZIPInputStream :
gzipInputStream.close();
You can also open a GZIPInputStream using the try-with-resources construct,
so the GZIPInputStream is closed automatically when you are done using it. Here is how that
looks:
try(GZIPInputStream gzipInputStream = new GZIPInputStream(new FileInputStream("myfile.zip"))) {
int data = gzipInputStream.read();
while(data != -1){
//do something with data
data = gzipInputStream.read();
}
}
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Jakob Jenkov | |
