字符串判空错误

前端传来的请求数据，若用只用String为null判断，则忽略了str=“”的情况，此时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,"帖子标题不可为空");}if(content==null){return CommunityUtil.getJSONString(2,"帖子内容不可为空");}... ...return CommunityUtil.getJSONString(0,"发布成功！");}

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

    @RequestMapping(path = "/add", method = RequestMethod.POST)@ResponseBodypublic String addDiscussPost(String title, String content){// 判空if(StringUtils.isBlank(title)){return CommunityUtil.getJSONString(1,"帖子标题不可为空");}if(StringUtils.isBlank(content)){return CommunityUtil.getJSONString(2,"帖子内容不可为空");}... ...return CommunityUtil.getJSONString(0,"发布成功！");}