说明

要启用缓存支持，只需要 @EnableCaching 注释，Spring 引导就会自动配置缓存基础设施

例

pom.xml（只粘贴部分内容）

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
    </dependencies>

文件结构

src/
 +- main/
     +- java/
         +- com/
             +- lee/
                 +- springbootdemo/
                     +- pojo/
                         +- City.java
                     +- repository/
                         +- CityRepository.java
                     +- service/
                         +- impl/
                             +- CityServiceImpl.java
                         +- CityService.java
                     +- controller/
                         +- CityRestController.java
                     +- SpringBootDemoApplication.java
     +- resources/
         +- <other resource>

City.java

@Entity
public class City implements Serializable {

    @Id
    @GeneratedValue
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false)
    private String state;

    public Long getId() { return id; }
    public void setId(Long id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public String getState() { return state; }
    public void setState(String state) { this.state = state; }
}

CityRepository.java

public interface CityRepository extends JpaRepository<City, Long> {}

CityServiceImpl.java

@Service
public class CityServiceImpl implements CityService {

    @Autowired
    private CityRepository cityRepository;

    @Override
    public City save(City city) { return cityRepository.save(city); }

    @Cacheable("cityCache")
    @Override
    public Optional<City> findById(Long id) { return cityRepository.findById(id); }

    @Override
    public void delete(Long id) { cityRepository.deleteById(id); }
}

CityRestController.java

@RestController
@RequestMapping("/city")
public class CityRestController {

    @Autowired
    private CityService cityService;

    @GetMapping("/{name}/{state}")
    public City city(@PathVariable String name, @PathVariable String state) {
        City city = new City();
        city.setName(name);
        city.setState(state);
        city = cityService.save(city);

        return cityService.findById(city.getId()).get();
    }
}

运行应用程序，浏览器访问地址，如下图

SpringBootJpa.png

查看 Redis

cached.png

第二次执行 keys * 命令时，出现新数据，说明缓存已经存储在 Redis 中

参考

1. Spring Boot Caching 官方文档

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