CONTROLLER

/**

* 探花

*

* @return

*/

@GetMapping("cards")

public ResponseEntity> queryCardsList() {

try {

List list = this.tanHuaService.queryCardsList();

return ResponseEntity.ok(list);

} catch (Exception e) {

e.printStackTrace();

}

return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();

}

===========================================================

SERVICE

/**

* 查询推荐卡片列表，从推荐列表中随机选取10个用户

*

* @return

*/

public List queryCardsList() {

User user = UserThreadLocal.get();

int count = 50;

//查询到的50条数据，并不是用来直接展现，需要从这50条数据中随机返回一些数据

List recommendUserList = this.recommendUserService.queryCardList(user.getId(), count);

if (CollUtil.isEmpty(recommendUserList)) {

recommendUserList = new ArrayList<>();

//默认推荐列表

List list = StrUtil.split(defaultRecommendUsers, ',');

for (String userId : list) {

RecommendUser recommendUser = new RecommendUser();

recommendUser.setToUserId(user.getId());

recommendUser.setUserId(Convert.toLong(userId));

recommendUserList.add(recommendUser);

}

}

//计算展现的数量，默认展现10个

int showCount = Math.min(10, recommendUserList.size());

List result = new ArrayList<>();

for (int i = 0; i < showCount; i++) {

//TODO 可能重复

int index = RandomUtil.randomInt(0, recommendUserList.size());

RecommendUser recommendUser = recommendUserList.get(index);

result.add(recommendUser);

}

List