void finish()

描述 (Description)

java.util.zip.GZIPOutputStream.finish()方法完成将压缩数据写入输出流而不关闭底层流。 将多个过滤器连续应用于同一输出流时，请使用此方法。

声明 (Declaration)

以下是java.util.zip.GZIPOutputStream.finish()方法的声明。

public void finish()
   throws IOException

异常 (Exceptions)

• IOException - 如果发生I/O错误。

例子 (Example)

以下示例显示了java.util.zip.GZIPOutputStream.finish（）方法的用法。

package cn.xnip;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.zip.DataFormatException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class GZIPOutputStreamDemo {
   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");
      // Compress the bytes
      ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
      GZIPOutputStream outputStream = new GZIPOutputStream(arrayOutputStream);
      outputStream.write(input);
      outputStream.finish();
      outputStream.close();
      //Read and decompress the data
      byte[] readBuffer = new byte[5000];
      ByteArrayInputStream arrayInputStream = 
         new ByteArrayInputStream(arrayOutputStream.toByteArray());
      GZIPInputStream inputStream = new GZIPInputStream(arrayInputStream);
      int read = inputStream.read(readBuffer,0,readBuffer.length);
      inputStream.close();
      //Should hold the original (reconstructed) data
      byte[] result = Arrays.copyOf(readBuffer, read);
      // Decode the bytes into a String
      message = new String(result, "UTF-8");
      System.out.println("UnCompressed Message length : " + message.length());
   }
}

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
UnCompressed Message length : 300