java.util.zip.Deflater.deflate(byte[] b)方法示例

java.util.zip.Deflater.deflate(byte [] b)方法压缩输入数据并用压缩数据填充指定的缓冲区。 返回压缩数据的实际字节数。 返回值为0表示需要调用needsInput以确定是否需要更多输入数据。

声明

以下是java.util.zip.Deflater.deflate(byte [] b)方法的声明。

public int deflate(byte[] b)

参数

• b - 压缩数据的缓冲区。

返回值

• 写入输出缓冲区的压缩数据的实际字节数。

示例

以下示例显示了java.util.zip.Deflater.deflate(byte [] b)方法的用法。

package com.zaixian;

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 zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.com;"
         +"Welcome to zaixianPoint.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());
   }
}

执行上面示例代码，得到以下结果 -

Original Message length : 300
Compressed Message length : 42
UnCompressed Message length : 300