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How to compress and un-compress the data of a file in Java?
Java provides a two classes namely, DeflaterOutputStream and InflaterInputStream for compressing and uncompressing data.
Compressing a Single file
To compress a single file −
- Create a FileInputStream object, by passing the path of the file to be compressed in String format, as a parameter to its constructor.
- Create a FileOutputStream object, by passing the path of the output file, in String format, as a parameter to its constructor.
- Create a DeflaterOutputStream object, by passing the above created FileOutputStream object, as a parameter to its constructor.
- Then, read the contents of the input file and write using the write() method of the DeflaterOutputStream class.
Example
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.DeflaterOutputStream;
public class CompressingFiles {
public static void main(String args[]) throws IOException {
//Instantiating the FileInputStream
String inputPath = "D:\ExampleDirectory\logo.jpg";
FileInputStream inputStream = new FileInputStream(inputPath);
//Instantiating the FileOutputStream
String outputPath = "D:\ExampleDirectory\compressedLogo.txt";
FileOutputStream outputStream = new FileOutputStream(outputPath);
//Instantiating the DeflaterOutputStream
DeflaterOutputStream compresser = new DeflaterOutputStream(outputStream);
int contents;
while ((contents=inputStream.read())!=-1){
compresser.write(contents);
}
compresser.close();
System.out.println("File compressed.......");
}
}Output
File compressed.......
Uncompressing the compressed file
To un-compress a compressed file −
- Create a FileInputStream object, by passing the path of the compressed file in String format, as a parameter to its constructor.
- Create a FileOutputStream object, by passing the path of the output file (uncompressed image file), in String format, as a parameter to its constructor.
- Create a InflaterInputStream object, by passing the above created FileOutputStream object, as a parameter to its constructor.
- Then, read the contents of the InflaterInputStream object and write using the write() method of the FileOutputStream class.
Example
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.InflaterInputStream;
public class DeCompressingFiles {
public static void main(String args[]) throws IOException {
StringinputPath ="D:\ExampleDirectory\compressed.txt";
//Instantiating the FileInputStream
FileInputStream inputStream = new FileInputStream(inputPath);
String outputpath = "D:\ExampleDirectory\output.jpg";
FileOutputStream outputStream = new FileOutputStream(outputpath);
InflaterInputStream decompresser = new InflaterInputStream(inputStream);
int contents;
while ((contents=decompresser.read())!=-1){
outputStream.write(contents);
}
//close the file
outputStream.close();
decompresser.close();
System.out.println("File un-compressed.......");
}
}Output
File un-compressed.......
Updated on: 02-Aug-2019
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