fetch 파일다운로드

/* 자바 스크립트 */

function fileDownLoad(fileName,finalFileName,path){
	const paramData = { 
         method: 'POST',
         body: JSON.stringify({ fileName, finalFileName,path }),
         headers: {
            'Content-Type': 'application/json'
         }
    };
	
	fetch('/logFarm/downloadFetchFiles.json',paramData)
	  .then(res => res.blob())
	  .then(data => {
		  const a = document.createElement("a");
		  a.href = window.URL.createObjectURL(data);
		  a.download = fileName
		  a.click();
	  });
	
}

/* 자바 */
/**
	 *
	 * <pre>
	 * @desc  fetch 파일 다운로드
	 * @param
	 * @return
	 * @return
	 * @throws
	 * </pre>
	 */
	@RequestMapping(value = "/downloadFetchFiles.json" )
	public void downloadFetchFiles(HttpServletRequest request, HttpServletResponse response,@RequestBody String jsonData) {

		logger.debug("-------------- 파일다운로드 -------------");

		logger.debug("sendPushMessage.json jsonData 문자형식 : " + jsonData);
		
		JsonParser parser = new JsonParser();
	    JsonElement element = parser.parse(jsonData);
	    String getPath = element.getAsJsonObject().get("path").getAsString();
	    String getName = element.getAsJsonObject().get("fileName").getAsString();
	    String getOrginFileName = element.getAsJsonObject().get("finalFileName").getAsString();
	      
			 	
		logger.debug("getOrginFileName : " + getOrginFileName);
		logger.debug("getName : " + getName);
		logger.debug("getPath : " + getPath);

		//String filePath = EgovProperties.getProperty("Globals.fileStorePath").trim() + getPath +SP+ getOrginFileName;
		String filePath = EgovProperties.getProperty("Globals.fileStorePath").trim() + getOrginFileName;

		logger.debug("filePath : " + filePath);
		
		Map<String, Object> reMap = new HashMap<>();
	    OutputStream os = null;
	    InputStream is = null;
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		ServletOutputStream sout = null;
		File f = new File(filePath);

	   try {
			   response.reset();
			   response.setCharacterEncoding("utf-8");
			   response.setContentType("application/octet-stream");
			   response.setHeader("Content-Disposition","attachment;filename=" + new String(getName.getBytes("UTF-8"), "ISO8859-1"));


				is = new FileInputStream(f);
				if (is == null) {
					reMap.put("msg", "파일이 존재 하지 않습니다.");
	       		}
				sout = response.getOutputStream();

				bis = new BufferedInputStream(is);
				bos = new BufferedOutputStream(sout);
				byte[] buff = new byte[2048];
				int bytesRead;
				while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
				   bos.write(buff, 0, bytesRead);
				}
				bos.flush();
				bos.close();
				bis.close();
				is.close();
		        sout.close();
			//	os.close();
	   } catch (IOException e) {
	 	     reMap.put("msg", "처리중 오류가 발생하였습니다.");
	   } catch (Exception e) {
		   reMap.put("msg", "처리중 오류가 발생하였습니다.");
	   } finally
	   {
		   if (bis != null)
		   {
			   try
			   {
				   bis.close();
			   } catch (RuntimeException e) {
				   f = null;
			   }
			   catch (Exception e)
			   {
				   f = null;
			   }
		   }
		   if (bos != null)
		   {
			   try
			   {
				   bos.close();
			   } catch (RuntimeException e) {
				   f = null;
			   }
			   catch (Exception e)
			   {
				   f = null;
			   }
		   }
		   if (is != null)
		   {
			   try
			   {
				   is.close();
			   } catch (RuntimeException e) {
				   f = null;
			   }
			   catch (Exception e)
			   {
				   f = null;
			   }
		   }
		   if (sout != null)
		   {
			   try
			   {
				   sout.close();
			   } catch (RuntimeException e) {
				   f = null;
			   }
			   catch (Exception e)
			   {
				   f = null;
			   }
		   }
		   if (os != null)
		   {
			   try
			   {
				   os.close();
			   } catch (RuntimeException e) {
				   f = null;
			   }
			   catch (Exception e)
			   {
				   f = null;
			   }
		   }
	   }

	}