- java.util.zip Package Classes
- java.util.zip - Home
- java.util.zip - Adler32
- java.util.zip - CheckedInputStream
- java.util.zip - CheckedOutputStream
- java.util.zip - CRC32
- java.util.zip - Deflater
- java.util.zip - DeflaterInputStream
- java.util.zip - DeflaterOutputStream
- java.util.zip - GZIPInputStream
- java.util.zip - GZIPOutputStream
- java.util.zip - Inflater
- java.util.zip - InflaterInputStream
- java.util.zip - InflaterOutputStream
- java.util.zip - ZipEntry
- java.util.zip - ZipFile
- java.util.zip - ZipInputStream
- java.util.zip - ZipOutputStream
- java.util.zip Package Extras
- java.util.zip - Exceptions
- java.util.zip - Error
- java.util.zip Useful Resources
- java.util.zip - Quick Guide
- java.util.zip - Useful Resources
- java.util.zip - Discussion
java.util.zip.Deflater.deflate() Method Example
Description
The java.util.zip.Deflater.deflate(byte[] b) method compresses the input data and fills specified buffer with compressed data. Returns actual number of bytes of compressed data. A return value of 0 indicates that needsInput should be called in order to determine if more input data is required.
Declaration
Following is the declaration for java.util.zip.Deflater.deflate(byte[] b) method.
public int deflate(byte[] b)
Parameters
b − the buffer for the compressed data.
Returns
The actual number of bytes of compressed data written to the output buffer.
Example
The following example shows the usage of java.util.zip.Deflater.deflate(byte[] b) method.
package com.tutorialspoint; import java.io.UnsupportedEncodingException; import java.util.zip.DataFormatException; import java.util.zip.Deflater; import java.util.zip.Inflater; public class DeflaterDemo { public static void main(String[] args) throws DataFormatException, UnsupportedEncodingException { String message = "Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;" +"Welcome to TutorialsPoint.com;"; System.out.println("Original Message length : " + message.length()); byte[] input = message.getBytes("UTF-8"); // Compress the bytes byte[] output = new byte[1024]; Deflater deflater = new Deflater(); deflater.setInput(input); deflater.finish(); int compressedDataLength = deflater.deflate(output); deflater.end(); System.out.println("Compressed Message length : " + compressedDataLength); // Decompress the bytes Inflater inflater = new Inflater(); inflater.setInput(output, 0, compressedDataLength); byte[] result = new byte[1024]; int resultLength = inflater.inflate(result); inflater.end(); // Decode the bytes into a String message = new String(result, 0, resultLength, "UTF-8"); System.out.println("UnCompressed Message length : " + message.length()); } }
Let us compile and run the above program, this will produce the following result −
Original Message length : 300 Compressed Message length : 42 UnCompressed Message length : 300Print
javazip_deflater.htm
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