Spring Boot 整合 Redis 实现缓存操作

springboot-mybatis-redis/src/main/java/org/spring/springboot/Application.java

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+package org.spring.springboot;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.spring.springboot.dao.CityDao;
+import org.spring.springboot.domain.City;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * Spring Boot 应用启动类
+ *
+ * Created by bysocket on 16/4/26.
+ */
+// Spring Boot 应用的标识
+@SpringBootApplication
+// mapper 接口类扫描包配置
+@MapperScan("org.spring.springboot.dao")
+public class Application {
+
+    public static void main(String[] args) {
+        // 程序启动入口
+        // 启动嵌入式的 Tomcat 并初始化 Spring 环境及其各 Spring 组件
+        SpringApplication.run(Application.class,args);
+    }
+}

springboot-mybatis-redis/src/main/java/org/spring/springboot/controller/CityRestController.java

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+package org.spring.springboot.controller;
+
+import org.spring.springboot.domain.City;
+import org.spring.springboot.service.CityService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+/**
+ * Created by bysocket on 07/02/2017.
+ */
+@RestController
+public class CityRestController {
+
+    @Autowired
+    private CityService cityService;
+
+
+    @RequestMapping(value = "/api/city/{id}", method = RequestMethod.GET)
+    public City findOneCity(@PathVariable("id") Long id) {
+        return cityService.findCityById(id);
+    }
+
+    @RequestMapping(value = "/api/city", method = RequestMethod.POST)
+    public void createCity(@RequestBody City city) {
+        cityService.saveCity(city);
+    }
+
+    @RequestMapping(value = "/api/city", method = RequestMethod.PUT)
+    public void modifyCity(@RequestBody City city) {
+        cityService.updateCity(city);
+    }
+
+    @RequestMapping(value = "/api/city/{id}", method = RequestMethod.DELETE)
+    public void modifyCity(@PathVariable("id") Long id) {
+        cityService.deleteCity(id);
+    }
+}

springboot-mybatis-redis/src/main/java/org/spring/springboot/dao/CityDao.java

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+package org.spring.springboot.dao;
+
+import org.apache.ibatis.annotations.Param;
+import org.spring.springboot.domain.City;
+
+import java.util.List;
+
+/**
+ * 城市 DAO 接口类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public interface CityDao {
+
+    /**
+     * 获取城市信息列表
+     *
+     * @return
+     */
+    List<City> findAllCity();
+
+    /**
+     * 根据城市 ID，获取城市信息
+     *
+     * @param id
+     * @return
+     */
+    City findById(@Param("id") Long id);
+
+    Long saveCity(City city);
+
+    Long updateCity(City city);
+
+    Long deleteCity(Long id);
+}

springboot-mybatis-redis/src/main/java/org/spring/springboot/domain/City.java

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+package org.spring.springboot.domain;
+
+import java.io.Serializable;
+
+/**
+ * 城市实体类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public class City implements Serializable {
+
+    private static final long serialVersionUID = -1L;
+
+    /**
+     * 城市编号
+     */
+    private Long id;
+
+    /**
+     * 省份编号
+     */
+    private Long provinceId;
+
+    /**
+     * 城市名称
+     */
+    private String cityName;
+
+    /**
+     * 描述
+     */
+    private String description;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getProvinceId() {
+        return provinceId;
+    }
+
+    public void setProvinceId(Long provinceId) {
+        this.provinceId = provinceId;
+    }
+
+    public String getCityName() {
+        return cityName;
+    }
+
+    public void setCityName(String cityName) {
+        this.cityName = cityName;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public String toString() {
+        return "City{" +
+                "id=" + id +
+                ", provinceId=" + provinceId +
+                ", cityName='" + cityName + '\'' +
+                ", description='" + description + '\'' +
+                '}';
+    }
+}

springboot-mybatis-redis/src/main/java/org/spring/springboot/service/CityService.java

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+package org.spring.springboot.service;
+
+import org.spring.springboot.domain.City;
+
+import java.util.List;
+
+/**
+ * 城市业务逻辑接口类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public interface CityService {
+    /**
+     * 根据城市 ID,查询城市信息
+     *
+     * @param id
+     * @return
+     */
+    City findCityById(Long id);
+
+    /**
+     * 新增城市信息
+     *
+     * @param city
+     * @return
+     */
+    Long saveCity(City city);
+
+    /**
+     * 更新城市信息
+     *
+     * @param city
+     * @return
+     */
+    Long updateCity(City city);
+
+    /**
+     * 根据城市 ID,删除城市信息
+     *
+     * @param id
+     * @return
+     */
+    Long deleteCity(Long id);
+}

springboot-mybatis-redis/src/main/java/org/spring/springboot/service/impl/CityServiceImpl.java

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+package org.spring.springboot.service.impl;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.spring.springboot.dao.CityDao;
+import org.spring.springboot.domain.City;
+import org.spring.springboot.service.CityService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * 城市业务逻辑实现类
+ * <p>
+ * Created by bysocket on 07/02/2017.
+ */
+@Service
+public class CityServiceImpl implements CityService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CityServiceImpl.class);
+
+    @Autowired
+    private CityDao cityDao;
+
+    @Autowired
+    private RedisTemplate redisTemplate;
+
+    /**
+     * 获取城市逻辑：
+     * 如果缓存存在，从缓存中获取城市信息
+     * 如果缓存不存在，从 DB 中获取城市信息，然后插入缓存
+     */
+    public City findCityById(Long id) {
+        // 从缓存中获取城市信息
+        String key = "city_" + id;
+        ValueOperations<String, City> operations = redisTemplate.opsForValue();
+
+        // 缓存存在
+        boolean hasKey = redisTemplate.hasKey(key);
+        if (hasKey) {
+            City city = operations.get(key);
+
+            LOGGER.info("CityServiceImpl.findCityById() : 从缓存中获取了城市 >> " + city.toString());
+            return city;
+        }
+
+        // 从 DB 中获取城市信息
+        City city = cityDao.findById(id);
+
+        // 插入缓存
+        operations.set(key, city, 10, TimeUnit.SECONDS);
+        LOGGER.info("CityServiceImpl.findCityById() : 城市插入缓存 >> " + city.toString());
+
+        return city;
+    }
+
+    @Override
+    public Long saveCity(City city) {
+        return cityDao.saveCity(city);
+    }
+
+    /**
+     * 更新城市逻辑：
+     * 如果缓存存在，删除
+     * 如果缓存不存在，不操作
+     */
+    @Override
+    public Long updateCity(City city) {
+        Long ret = cityDao.updateCity(city);
+
+        // 缓存存在，删除缓存
+        String key = "city_" + city.getId();
+        boolean hasKey = redisTemplate.hasKey(key);
+        if (hasKey) {
+            redisTemplate.delete(key);
+
+            LOGGER.info("CityServiceImpl.updateCity() : 从缓存中删除城市 >> " + city.toString());
+        }
+
+        return ret;
+    }
+
+    @Override
+    public Long deleteCity(Long id) {
+
+        Long ret = cityDao.deleteCity(id);
+
+        // 缓存存在，删除缓存
+        String key = "city_" + id;
+        boolean hasKey = redisTemplate.hasKey(key);
+        if (hasKey) {
+            redisTemplate.delete(key);
+
+            LOGGER.info("CityServiceImpl.deleteCity() : 从缓存中删除城市 ID >> " + id);
+        }
+        return ret;
+    }
+
+}