字符串判空錯誤

前端傳來的請求數據，若用只用String為null判斷，則忽略了str=“”的情況，此時str不空，但str.length()==0

    @RequestMapping(path = "/add", method = RequestMethod.POST)@ResponseBodypublic String addDiscussPost(String title, String content){// 判空if(title==null){return CommunityUtil.getJSONString(1,"帖子標題不可為空");}if(content==null){return CommunityUtil.getJSONString(2,"帖子內容不可為空");}... ...return CommunityUtil.getJSONString(0,"發布成功！");}

引入lang3包，利用StringUtils.isBlank()方法，可以兼顧str==null和str=“”的情況

    @RequestMapping(path = "/add", method = RequestMethod.POST)@ResponseBodypublic String addDiscussPost(String title, String content){// 判空if(StringUtils.isBlank(title)){return CommunityUtil.getJSONString(1,"帖子標題不可為空");}if(StringUtils.isBlank(content)){return CommunityUtil.getJSONString(2,"帖子內容不可為空");}... ...return CommunityUtil.getJSONString(0,"發布成功！");}