이미지파일 없는글쓰면 오류나는데 어디를수정해야할까요?

Question

컨트롤러 클래스에 필요한 부분만 올릴께요@Controller("boardController") public class BoardControllerImpl implements BoardController{ private static final String ARTICLE_IMAGE_REPO = "C:\board\article_image"; @Autowired private BoardService boardService; @Autowired private ArticleVO articleVO; private List upload(MultipartHttpServletRequest multipartRequest) throws Exception{ List fileList= new ArrayList(); Iterator fileNames = multipartRequest.getFileNames(); while(fileNames.hasNext()){ String fileName = fileNames.next(); MultipartFile mFile = multipartRequest.getFile(fileName); String originalFileName=mFile.getOriginalFilename(); fileList.add(originalFileName); File file = new File(ARTICLE_IMAGE_REPO +"\"+"temp"+"\" + fileName); if(mFile.getSize()!=0){ //File Null Check if(!file.exists()){ file.getParentFile().mkdirs(); mFile.transferTo(new File(ARTICLE_IMAGE_REPO +"\"+"temp"+ "\"+originalFileName)); } } } return fileList; } @Override @RequestMapping(value="/board/addNewArticle.do" ,method = RequestMethod.POST) @ResponseBody public ResponseEntity addNewArticle(MultipartHttpServletRequest multipartRequest, HttpServletResponse response) throws Exception { multipartRequest.setCharacterEncoding("utf-8"); String imageFileName=null; Map articleMap = new HashMap(); Enumeration enu=multipartRequest.getParameterNames(); while(enu.hasMoreElements()){ String name=(String)enu.nextElement(); String value=multipartRequest.getParameter(name); articleMap.put(name,value); } HttpSession session = multipartRequest.getSession(); MemberVO memberVO = (MemberVO) session.getAttribute("member"); String id = memberVO.getId(); articleMap.put("id",id); articleMap.put("parentNO", 0); List fileList =upload(multipartRequest); List imageFileList = new ArrayList(); if(fileList!= null && fileList.size()!=0) { for(String fileName : fileList) { ImageVO imageVO = new ImageVO(); imageVO.setImageFileName(fileName); imageFileList.add(imageVO); } articleMap.put("imageFileList", imageFileList); } String message; ResponseEntity resEnt=null; HttpHeaders responseHeaders = new HttpHeaders(); responseHeaders.add("Content-Type", "text/html; charset=utf-8"); try { int articleNO = boardService.addNewArticle(articleMap); if(imageFileList!=null && imageFileList.size()!=0) { for(ImageVO imageVO:imageFileList) { imageFileName = imageVO.getImageFileName(); File srcFile = new File(ARTICLE_IMAGE_REPO+"\"+"temp"+"\"+imageFileName); File destDir = new File(ARTICLE_IMAGE_REPO+"\"+articleNO); //destDir.mkdirs(); FileUtils.moveFileToDirectory(srcFile, destDir,true); } } message = ""; resEnt = new ResponseEntity(message, responseHeaders, HttpStatus.CREATED); }catch(Exception e) { if(imageFileList!=null && imageFileList.size()!=0) { for(ImageVO imageVO:imageFileList) { imageFileName = imageVO.getImageFileName(); File srcFile = new File(ARTICLE_IMAGE_REPO+"\"+"temp"+"\"+imageFileName); srcFile.delete(); } } message = " "; resEnt = new ResponseEntity(message, responseHeaders, HttpStatus.CREATED); e.printStackTrace(); } return resEnt; } } 이렇게 실행해서 이미지파일 없이 글쓰면 java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "imageFileList" is null이렇게 오류나는데 imageFileList에 null처리를 어떻게해줘야할지 모르겠어요 ㅠ이것저것 시도해봤는데 다실패...ㅠ어디를 어떻게 고쳐야할지 고수분들 답변부탁드립니다!

manijang2 · Answer

이미지파일을 쓰기전 널인지 체크하고 널이 아닐 경우에만 사용한다.이미지 리스트가 없을 때에는 널값이 아니라 빈 이미지리스트를 사용한다.

이미지파일 없는글쓰면 오류나는데 어디를수정해야할까요?

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