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JAVA EXAMPLE PROGRAMS

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Program: How to decompress byte array in java?


Description:

java.util.zip package provides Inflater class to decompress byte array. The sample code to decompress a byte array is given in the below example. Also the example contains a code to compress the byte array before decompressing it.


Code:
/**
* Decompression class
**/
package com.java2novice.zip;

import java.io.ByteArrayOutputStream;
import java.util.zip.Inflater;

public class MyByteArrayDecompress {

public byte[] decompressByteArray(byte[] bytes){
		
		ByteArrayOutputStream baos = null;
		Inflater iflr = new Inflater();
		iflr.setInput(bytes);
		baos = new ByteArrayOutputStream();
		byte[] tmp = new byte[4*1024];
		try{
			while(!iflr.finished()){
				int size = iflr.inflate(tmp);
				baos.write(tmp, 0, size);
			}
		} catch (Exception ex){
			
		} finally {
			try{
				if(baos != null) baos.close();
			} catch(Exception ex){}
		}
		
		return baos.toByteArray();
	}

	public static void main(String a[]){
		
		MyByteArrayCompress mbc = new MyByteArrayCompress();
		byte[] content = mbc.compressByteArray("Compress java2novice.com".getBytes());
		System.out.println("Compressed Data: "+new String(content));
		MyByteArrayDecompress mba = new MyByteArrayDecompress();
		byte[] decom = mba.decompressByteArray(content);
		System.out.println("Decomplressed Data: "+new String(decom));
	}
}

/**
* Compression class
**/
package com.java2novice.zip;

import java.io.ByteArrayOutputStream;
import java.util.zip.Deflater;

public class MyByteArrayCompress {

	public byte[] compressByteArray(byte[] bytes){
		
		ByteArrayOutputStream baos = null;
		Deflater dfl = new Deflater();
		dfl.setLevel(Deflater.BEST_COMPRESSION);
		dfl.setInput(bytes);
		dfl.finish();
		baos = new ByteArrayOutputStream();
		byte[] tmp = new byte[4*1024];
		try{
			while(!dfl.finished()){
				int size = dfl.deflate(tmp);
				baos.write(tmp, 0, size);
			}
		} catch (Exception ex){
			
		} finally {
			try{
				if(baos != null) baos.close();
			} catch(Exception ex){}
		}
		
		return baos.toByteArray();
	}
	
	public static void main(String a[]){
		
		MyByteArrayCompress mbc = new MyByteArrayCompress();
		byte[] content = mbc.compressByteArray("Compress java2novice.com".getBytes());
		System.out.println(new String(content));
	}
}

Output:
Compressed Data: xs-(J-.VJ,K4/LNKst	2
Decomplressed Data: Compress java2novice.com
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List of all java.util.zip class sample examples:

  1. How to compress byte array in java?
  2. How to decompress byte array in java?
  3. How to zip a single file?
  4. How to zip multiple files?
  5. How to read zip files entries or file name list?
  6. How to unzip files in java?
  7. How to generate checksum value for for a file in java?
  8. How to compress and store objects using zip utility?
  9. How to decompress the compressed objects using zip utility?
  10. How to zip a file using ZipFile class?
  11. How to compress a file in GZip format?
  12. How to uncompress a file from GZip format?
Knowledge Centre
Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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