目标：

从长尾关键词挖掘_站长工具_智能改写 - 5118营销大数据中获得数据集

业务层

@Autowired
    MongoTemplate mongoTemplate;

    /**
     * 联想词
     * @param userSearchDto
     * @return
     */
    @Override
    public ResponseResult findAssociate(UserSearchDto userSearchDto) {
        //1 参数检查
        if(userSearchDto == null || StringUtils.isBlank(userSearchDto.getSearchWords())){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        //分页检查
        if (userSearchDto.getPageSize() > 20) {
            userSearchDto.setPageSize(20);
        }

        //3 执行查询 模糊查询
        Query query = Query.query(Criteria.where("associateWords").regex(".*?\\" + userSearchDto.getSearchWords() + ".*"));
        query.limit(userSearchDto.getPageSize());
        List<ApAssociateWords> wordsList = mongoTemplate.find(query, ApAssociateWords.class);

        return ResponseResult.okResult(wordsList);
    }