SpringBoot整合Redis使用@Cacheable和RedisTemplate

@RequestMapping("/appUser/{currentPage}")
public R<String> getTableData1(@PathVariable int currentPage) {
    //第一次请求 前面几页用到的概率更大  把后面三页存入redis 减少后面分页请求的时间  以后每次加载页面都把那页放入redis
    // 设置一个小时过期
    Page<AppUser> appUserPage = new Page<AppUser>(currentPage, 12);
    if (currentPage == 1 && !redisTemplate.hasKey(1)) {
        for (int i = 1; i < 5; i++) {
            Page<AppUser> redisPage = new Page<AppUser>(i, 12);
            redisTemplate.opsForValue().set(i, appUserServiceInterface.page(redisPage), 1, TimeUnit.HOURS);
        }
    } else if (!redisTemplate.hasKey(currentPage)) {
        redisTemplate.opsForValue().set(currentPage, appUserServiceInterface.page(appUserPage), 1, TimeUnit.HOURS);
        return R.success((Page<AppUser>) redisTemplate.opsForValue().get(currentPage));
    } else if (redisTemplate.hasKey(currentPage)) {
        return R.success((Page<AppUser>) redisTemplate.opsForValue().get(currentPage));
    }
    return R.success(appUserServiceInterface.page(appUserPage));
}

@RequestMapping ("/userArea")
@Cacheable(value = "appUserData",key ="'userArea'")
public R<String> area() {
    List<AppUser> userList = appUserServiceInterface.list();
    List<String> areaList = new ArrayList<>();

    for (AppUser appUser : userList) {
        areaList.add(appUser.getArea());
    }
    //放入map记录每个月份出现的次数
    Map<String, Integer> areaTimes = new HashMap<>();
    for (String s : areaList) {
        if (!areaTimes.containsKey(s)) {
            areaTimes.put(s, 1);
        }else {
            areaTimes.put(s, areaTimes.get(s) + 1);
        }
    }
    //排序
    //自定义比较器
    Comparator<Map.Entry<String, Integer>> valCmp = new Comparator<Map.Entry<String, Integer>>() {
        @Override
        public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
            // TODO Auto-generated method stub
            return o2.getValue() - o1.getValue();  // 降序排序，如果想升序就反过来
        }
    };
    //将map转成List，map的一组key，value对应list一个存储空间
    List<Map.Entry<String, Integer>> mapList = new ArrayList<Map.Entry<String, Integer>>(areaTimes.entrySet()); //传入maps实体
    Collections.sort(mapList, valCmp);

    //取前8
    int len = mapList.size();
    for (int i = 0; i < len-8; i++) {
        mapList.remove(8);
    }

    Map<String, String> resMap = new HashMap<>();
    for (Map.Entry<String, Integer> m : mapList) {
        resMap.put(m.getKey(), m.getValue().toString());
    }
    return R.success(resMap);
}