[JAVA] 특정 URL의 이미지스트림 가져오기 (Image URL to OutputStream)

public void getImgFromUrl(HttpServletResponse response, String strUrl) {
        if (strUrl == null || strUrl.length() == 0) {
            return;
        }
        
        InputStream inputStream = null;
        ServletOutputStream outputStream = null;
        
        try {
            inputStream = new URL(strUrl).openStream();
            outputStream = response.getOutputStream();
            
            int length;
            byte[] buffer = new byte[12288]; // 12K
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, length);
            }

              outputStream.flush();
            
        } catch (Exception e) {
            e.printStackTrace();
            
        } finally {
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (NullPointerException e) {
            } catch (Exception e) {
            }
            
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (NullPointerException e) {
            } catch (Exception e) {
            }
        }
    }