init

ruoyi-cai/src/main/java/com/ruoyi/cai/service/CaiCitysService.java

@@ -0,0 +1,18 @@
+package com.ruoyi.cai.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.ruoyi.cai.domain.CaiCitys;
+
+import java.util.Map;
+
+/**
+ * 城市Service接口
+ *
+ * @author 77
+ * @date 2023-12-30
+ */
+public interface CaiCitysService extends IService<CaiCitys> {
+
+    Map<Long,String> all();
+
+}

ruoyi-cai/src/main/java/com/ruoyi/cai/service/impl/CaiCitysServiceImpl.java

@@ -0,0 +1,43 @@
+package com.ruoyi.cai.service.impl;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.TypeReference;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.ruoyi.cai.constant.RedisConstant;
+import com.ruoyi.cai.domain.CaiCitys;
+import com.ruoyi.cai.mapper.CaiCitysMapper;
+import com.ruoyi.cai.service.CaiCitysService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.stereotype.Service;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+/**
+ * 城市Service业务层处理
+ *
+ * @author 77
+ * @date 2023-12-30
+ */
+@Service
+public class CaiCitysServiceImpl extends ServiceImpl<CaiCitysMapper,CaiCitys> implements CaiCitysService {
+
+    @Autowired
+    private StringRedisTemplate redisTemplate;
+
+    @Override
+    public Map<Long, String> all() {
+        String value = redisTemplate.opsForValue().get(RedisConstant.CITY_CACHE_REDIS);
+        if(value != null){
+            return JSON.parseObject(value, new TypeReference<LinkedHashMap<Long, String>>(){});
+        }
+        List<CaiCitys> list = this.list();
+        Map<Long, String> map = list.stream().collect(Collectors.toMap(CaiCitys::getId, CaiCitys::getName));
+        redisTemplate.opsForValue().set(RedisConstant.CITY_CACHE_REDIS,JSON.toJSONString(map),30, TimeUnit.DAYS);
+        return map;
+    }
+}