long skip（long n）

描述 (Description)

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的字节数。 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 (Declaration)

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

public long skip(long n)
   throws IOException

参数 (Parameters)

• n - 要跳过的字节数。

返回值 (Returns)

跳过的实际字节数。

异常 (Exceptions)

• IOException - 如果发生I/O错误或此流已关闭。

例子 (Example)

以下示例显示了java.util.zip.DeflaterInputStream.skip（long n）方法的用法。

package cn.xnip;
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 xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;"
         +"Welcome to xnip.cn;";
      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