Java java.util.zip.DeflaterInputStream.skip()用法及代码示例

描述

这个java.util.zip.DeflaterInputStream.skip(long n)方法跳过并丢弃输入流中的数据。此方法可能会阻塞，直到读取并跳过指定数量的字节。注意：虽然 n 以 long 形式给出，但可以跳过的最大字节数是 Integer.MAX_VALUE。

声明

以下是声明java.util.zip.DeflaterInputStream.skip(long n)方法。

public long skip(long n)
   throws IOException

参数

• n- 要跳过的字节数。

返回

实际跳过的字节数。

异常

• IOException - 如果发生 I/O 错误或此流已关闭。

示例

下面的例子展示了 java.util.zip.DeflaterInputStream.skip(long n) 方法的用法。

package com.tutorialspoint;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.InflaterInputStream;

public class DeflaterInputStreamDemo {
   public static void main(String[] args) throws DataFormatException, IOException {
      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");
      int length = message.length();
      // 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.NO_FLUSH);
      System.out.println("Total uncompressed bytes input:" + deflater.getTotalIn());
      System.out.println("Compressed Message Checksum:" + deflater.getAdler());     
      deflater.finished();

      System.out.println("Compressed Message length:" + compressedDataLength);
   
      ByteArrayInputStream bin = new ByteArrayInputStream(output);
      InflaterInputStream inflaterInputStream = new InflaterInputStream(bin);
      byte[] result = new byte[1024];
      System.out.println("Before Skipping, available:" + inflaterInputStream.available());
      inflaterInputStream.skip(result.length);
      System.out.println("After Skipping, available:" + inflaterInputStream.available());
      inflaterInputStream.close();     
   }
}

让我们编译并运行上面的程序，这将产生以下结果 -

Original Message length:300
Total uncompressed bytes input:300
Compressed Message Checksum:368538129
Compressed Message length:42
Before Skipping, available:1
After Skipping, available:0