SpringBoot-EhCache使用

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创建SpringBoot工程

创建如下类：

@Entitypublic class User {    @Id    @GeneratedValue    private long  id;    @Column(nullable = false)    private  String name;    @Column(nullable = false)    private Integer age;    ......省略getter和setter方法}

jpa查询接口

public interface UserRepository extends JpaRepository<User,Long> {    User findByNameAndAge(String name, Integer age);    @Query("from User u where u.name=:name")    User findUser(@Param("name") String name);    @Cacheable    User findByName(String name);}

application.yml配置

spring:    datasource:          url:  jdbc:mysql://localhost:3306/test          username: root          password: 123456          driver-class-name: com.mysql.jdbc.Driver    jpa:      hibernate:        ddl-auto: update      show-sql: true

Test测试类

    @Autowired    private UserRepository userRepository;    @Before    public void before() {        userRepository.save(new User("BBB", 20));    }    @Test    public void test() throws Exception {        User user1 = userRepository.findByName("BBB");        System.out.println("第一次查询：" + user1.getAge());        User user2 = userRepository.findByName("BBB");        System.out.println("第二次查询：" + user2.getAge());    }

运行结果图

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引入EhCache缓存依赖包

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

    在入口程序加入@EnableCaching注解

@SpringBootApplication@EnableCachingpublic class SpringbootCacheApplication {    public static void main(String[] args) {        SpringApplication.run(SpringbootCacheApplication.class, args);    }}

数据接口中加入缓存注解

@CacheConfig(cacheNames = "user")public interface UserRepository extends JpaRepository<User,Long> {    @Cacheable    User findByName(String name);}

测试结果

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注解含义:

@CacheConfig(cacheNames =”user”)将共用的查询结果放在user对象中
@Cacheable 配置了findByName函数的返回值将被加入缓存。同时在查询时，会先从缓存中获取，若不存在才再发起对数据库的访问
具体参考：(http://docs.spring.io/spring/docs/current/spring-framework-reference/html/cache.html)
(http://blog.didispace.com/springbootcache1)

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