허니몬(Honeymon)의 자바guru

예제 코드 : 

HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(StrutsStatics.HTTP_RESPONSE);
response.setContentType("application/octet-stream; charset=utf-8");
try {
    //다운로드되는 파일의 정보를 헤더에 추가하는 코드
    response.setHeader("Content-Disposition",
            "attachment; filename=" + URLEncoder.encode(item.getName(), "utf-8") + ";");
}
catch (UnsupportedEncodingException ignored) {
    // do nothing
}

HttpServletResponse response = (HttpServletResponse) ActionContext.getContext()
        .get(StrutsStatics.HTTP_RESPONSE);
response.setContentType("application/x-download");
try {
    HttpServletRequest request = (HttpServletRequest) ActionContext.getContext()
            .get(StrutsStatics.HTTP_REQUEST);
    LOG.debug("User-Agent : " + request.getHeader("User-Agent"));
    if(request.getHeader("User-Agent").contains("Firefox")) {
        response.setHeader("Content-Disposition",
                "attachment;filename=\"" + new String(item.getName().getBytes("UTF-8"), "ISO-8859-1") + "\";");
    } else {
        response.setHeader("Content-Disposition",
                "attachment;filename=\"" + URLEncoder.encode(item.getName(), "utf-8") + "\";");
    }
}
catch (UnsupportedEncodingException ignored) {
    // do nothing
}
response.setHeader("Content-Transfer-Encoding", "binary");
LOG.debug("Content-Disposition : " + response.getHeader("Content-Disposition"));
LOG.debug("Content Type : " + response.getContentType());

File file = new File(item.getPath());
FileInputStream fileIn = null;
ServletOutputStream outstream = null;
try {
    fileIn = new FileInputStream(file);
    outstream = response.getOutputStream();
    byte[] outputByte = new byte[8192];

    while (fileIn.read(outputByte, 0, 8192) != -1) {
        outstream.write(outputByte, 0, 8192);
    }
    outstream.flush();
}
catch (FileNotFoundException e) {
    LOG.error(e);
}
catch (IOException e) {
    LOG.error(e);
}
finally {
    try {
        fileIn.close();
    }
    catch (IOException e) {
    }
    try {
        outstream.close();
    }
    catch (IOException e) {
    }
}

Collections.sort(ipList, new IpListSortByIp());

public class IpListSortByIp implements Comparator<String> {

        @Override
        public int compare(String o1, String o2) {
            try {
                if (InetAddress.getByName(o1).hashCode() > InetAddress.getByName(o2).hashCode()) {
                    return 1;
                } else if (InetAddress.getByName(o1).hashCode() < InetAddress.getByName(o2).hashCode()) {
                    return -1;
                }
            }
            catch (UnknownHostException e) {
                //Exception 처리
            }
            return 0;
        }
    }