java.util.zip.DeflaterInputStream.skip() 方法示例

說明

java.util.zip.DeflaterInputStream.skip(long n) 方法跳過輸入流中的資料並丟棄。此方法可能阻塞，直到讀取並跳過指定數量的位元組。請注意：雖然 n 表示為長整型，但可跳過的最大位元組數為 Integer.MAX_VALUE。

宣告

以下是 java.util.zip.DeflaterInputStream.skip(long n) 方法的宣告。

public long skip(long n)
   throws IOException

引數

• n − 要跳過的位元組數。

返回

實際跳過的位元組數。

異常

• IOException − 如果發生 I/O 錯誤或此流已關閉。

示例

以下示例演示了 java.util.zip.DeflaterInputStream.skip(long n) 方法的使用。

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();     
   }
}

讓我們編譯並執行上述程式，這將產生以下結果 -

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