JavaZip Inflater.needsInput() 方法

package com.codingdict;



import java.io.UnsupportedEncodingException;

import java.util.zip.DataFormatException;

import java.util.zip.Deflater;

import java.util.zip.Inflater;



public class InflaterDemo {

   public static void main(String[] args) 

      throws DataFormatException, UnsupportedEncodingException {

      String message = "Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.com;"

         +"Welcome to codingdict.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,0,output.length);

      deflater.end();



      System.out.println("Compressed Message length : " + compressedDataLength);



      // Decompress the bytes

      Inflater inflater = new Inflater();

      inflater.setInput(output, 0, 10);

      byte[] result = new byte[1024];

      int resultLength = inflater.inflate(result, 0 , 10);



      if(inflater.needsInput()){

         inflater.setInput(output, 10, compressedDataLength - resultLength);    

         resultLength += inflater.inflate(result, resultLength , result.length - resultLength);

      }



      inflater.end();



      // Decode the bytes into a String

      message = new String(result, 0, resultLength, "UTF-8");



      System.out.println("UnCompressed Message length : " + message.length());

   }

}