import java.io.File;

public static void sort(File[] filterResult){

   // 파일명으로 정렬한다.

   Arrays.sort(filterResult, new Comparator() {

      public int compare(Object arg0, Object arg1) {

         File file1 = (File)arg0;

         File file2 = (File)arg1;

         return file1.getName().compareToIgnoreCase(file2.getName());

      }

   });

}

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.77.Final</version>
</dependency>

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

public static ByteBuf strToBytoBuf(String strData)
{
    return Unpooled.wrappedBuffer(strData.getBytes(StandardCharsets.UTF_8));
}
public static String ByteBufToStr(ByteBuf byteBuf)
{
    return byteBuf.toString(CharsetUtil.UTF_8);
}