GZipUtils- gzip을 통한 압축시 charset처리

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;

import net.sf.jazzlib.GZIPInputStream;
import net.sf.jazzlib.GZIPOutputStream;


public class GZipUtils {

 
 /**
  * 지정된 폴더를 Zip 파일로 압축한다.
  *
  * @param sourceFileName
  *            - 압축 대상 파일
  * @param outputFileName
  *            -  확장자가 gz
  * @param encoding 파일의 encoding EUC-KR, UTF-8 등..
  * @throws Exception
  */
 public static void zip(String sourceFileName, String outputFileName,String encoding)
        throws Exception {

  Reader reader = null;
  Writer writer = null;
  try {
   InputStream inputStream = new FileInputStream(sourceFileName);
   reader = new BufferedReader(new InputStreamReader(inputStream,encoding));
   writer = new BufferedWriter(new OutputStreamWriter(
     new GZIPOutputStream(new FileOutputStream(outputFileName)), encoding));
  
   int bytes_read;
 
   while ((bytes_read = reader.read()) != -1 ) {
    writer.write(bytes_read);
   }
   writer.flush();
   
  }catch(Exception e) {
   throw e;
  }finally{
   if(reader != null)  reader.close();
   if(writer != null) writer.close();
  }
 }

 /**
  * GZip 파일의 압축을 푼다.
  *
  * @param gzipFileName
  *            - 압축 풀 GZip 파일명
  * @param targetFileName
  *            - 압축 푼 파일명
  * @param encoding 파일의 encoding EUC-KR, UTF-8 등..
  * @param fileNameToLowerCase
  *            - 파일명을 소문자로 바꿀지 여부
  * @throws Exception
  */
 public static void unzip(String gzipFileName, String targetFileName,String encoding)
        throws Exception {
  Reader reader = null;
  Writer writer = null;
  try {

   reader = (new InputStreamReader(new GZIPInputStream(new FileInputStream(gzipFileName)),encoding));
   
   writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(targetFileName), encoding));
   
   int bytes_read;

   while ((bytes_read = reader.read()) != -1 ) {
    writer.write(bytes_read);
   }
   writer.flush();

  } catch (Exception ex) {
   throw ex;
  } finally {
   if(reader != null) reader.close();
   if(writer != null) writer.close();
  }
 }

 
}