Hadoop学习–测试压缩–day05

import java.io.FileInputStream;

import java.io.FileOutputStream;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.io.IOUtils;

import org.apache.hadoop.io.compress.CompressionOutputStream;

import org.apache.hadoop.io.compress.DeflateCodec;

import org.apache.hadoop.util.ReflectionUtils;

import org.junit.BeforeClass;

import org.junit.Test;

public class TestCompressDemo {

  private static Configuration conf;

  @BeforeClass

   public static void iniConf(){

 conf = new Configuration();

  }

  /**

   * 使用deflate压缩算法

   */

  @Test

  public void compressByDeflate() throws Exception{

//deflate编码器

 String codecStr = “org.apache.hadoop.io.compress.DeflateCodec”;

 Class<DeflateCodec> clazz = (Class<DeflateCodec>) Class.forName(codecStr);

 DeflateCodec codec = ReflectionUtils.newInstance(clazz,conf);

//对输出流包装，产生新的压缩流

 FileOutputStream fos = new FileOutputStream(“E:/zhaopian.deflate”);

 CompressionOutputStream comOut = codec.createOutputStream(fos);

 //写入流

 IOUtils.copyBytes(new FileInputStream(“E:/zhaopian.jpg”),comOut,1024);

  }

  /**

   * 使用deflate压缩算法

   */

  @Test

  public void compressByDeflate2() throws Exception{

 //直接实例化codec对象

 DeflateCodec codec = new DeflateCodec();

 //检查并设置conf对象

 ReflectionUtils.setConf(codec,conf);

 //对输出流包装，产生新的压缩流

 FileOutputStream fos = new FileOutputStream(“E:/zhaopian2.deflate”);

 CompressionOutputStream comOut = codec.createOutputStream(fos);

 //写入流

 IOUtils.copyBytes(new FileInputStream(“E:/zhaopian.jpg”), comOut, 1024);

  }

}