How to un-compress a file in Java?

JavaObject Oriented ProgrammingProgramming

Java provides a class named InflaterInputStream this class is used to un-compress a compressed file.

The read() method of this class reads a single byte of compressed data from the input stream. To un-compress a compressed file using this method −

  • Create a FileInputStream object, bypassing the path of the compressed file in String format, as a parameter to its constructor.
  • Create a FileOutputStream object, bypassing the path of the output file (uncompressed image file), in String format, as a parameter to its constructor.
  • Create an InflaterInputStream object, bypassing 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.......
raja
Published on 15-Oct-2019 10:08:45
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