java.util.zip.DeflaterOutputStream.flush() 方法示例

描述

java.util.zip.DeflaterOutputStream.flush() 方法刷新压缩输出流。如果在构建此压缩输出流时 syncFlush 为 true，则此方法首先使用刷新模式Deflater.SYNC_FLUSH，让底层压缩器刷新全部待处理的数据以将其强制刷新到输出流，然后刷新输出流。否则，此方法只刷新输出流而不刷新压缩器。

声明

以下是 java.util.zip.DeflaterOutputStream.flush() 方法的声明。

public void flush()
   throws IOException

异常

• IOException − 如果发生 I/O 错误。

示例

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

package com.tutorialspoint;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterInputStream;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

public class DeflaterOutputStreamDemo {

   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;";
      String dictionary = "Welcome";
      System.out.println("Original Message length : " + message.length());
      byte[] input = message.getBytes("UTF-8");

      // Compress the bytes
      ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
      DeflaterOutputStream outputStream = new DeflaterOutputStream(arrayOutputStream);
      outputStream.write(input);
      outputStream.flush();
      outputStream.close();

      //Read and decompress the data
      byte[] readBuffer = new byte[5000];
      ByteArrayInputStream arrayInputStream = 
         new ByteArrayInputStream(arrayOutputStream.toByteArray());
      InflaterInputStream inputStream = new InflaterInputStream(arrayInputStream);
      int read = inputStream.read(readBuffer);

      //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述程序，将生成以下结果：−

Original Message length : 300
UnCompressed Message length : 300