Spring缓存注解@Cacheable @CacheEvit @CachePut使用介绍

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

 /**
  * 与 cacheNames 效果等价
  */
 @AliasFor("cacheNames")
 String[] value() default {};

 
 @AliasFor("value")
 String[] cacheNames() default {};

 /**
  * 缓存key
  */
 String key() default "";

/**
 * 首先从缓存中查，查到之后，直接返回缓存数据；否则执行方法，并将结果缓存
 * <p>
 * redisKey: cacheNames + key 组合而成 --> 支持SpEL
 * redisValue: 返回结果
 *
 * @param name
 * @return
 */
@Cacheable(cacheNames = "say", key = "'p_'+ #name")
public String sayHello(String name) {
    return "hello+" + name + "-->" + UUID.randomUUID().toString();
}

/**
 * 满足condition条件的才写入缓存
 *
 * @param age
 * @return
 */
@Cacheable(cacheNames = "condition", key = "#age", condition = "#age % 2 == 0")
public String setByCondition(int age) {
    return "condition:" + age + "-->" + UUID.randomUUID().toString();
}

/**
 * unless, 不满足条件才写入缓存
 *
 * @param age
 * @return
 */
@Cacheable(cacheNames = "unless", key = "#age", unless = "#age % 2 == 0")
public String setUnless(int age) {
    return "unless:" + age + "-->" + UUID.randomUUID().toString();
}

/**
 * 不管缓存有没有，都写入缓存
 *
 * @param age
 * @return
 */
@CachePut(cacheNames = "t4", key = "#age")
public String cachePut(int age) {
    return "t4:" + age + "-->" + UUID.randomUUID().toString();
}

/**
 * 失效缓存
 *
 * @param name
 * @return
 */
@CacheEvict(cacheNames = "say", key = "'p_'+ #name")
public String evict(String name) {
    return "evict+" + name + "-->" + UUID.randomUUID().toString();
}

/**
 * caching实现组合，添加缓存，并失效其他的缓存
 *
 * @param age
 * @return
 */
@Caching(cacheable = @Cacheable(cacheNames = "caching", key = "#age"), evict = @CacheEvict(cacheNames = "t4", key = "#age"))
public String caching(int age) {
    return "caching: " + age + "-->" + UUID.randomUUID().toString();
}

/**
 * 用于测试异常时，是否会写入缓存
 *
 * @param age
 * @return
 */
@Cacheable(cacheNames = "exception", key = "#age")
@Cacheable(cacheNames = "say", key = "'p_yihuihui'")
public int exception(int age) {
    return 10 / age;
}

@RestController
public class IndexRest {
    @Autowired
    private BasicDemo helloService;

    @GetMapping(path = {"", "/"})
    public String hello(String name) {
        return helloService.sayHello(name);
    }
}

curl http://localhost:8080/?name=yihuihui

@GetMapping(path = "evict")
public String evict(String name) {
    return helloService.evict(String.valueOf(name));
}

curl http://localhost:8080/evict?name=yihuihui
curl http://localhost:8080/?name=yihuihui

@GetMapping(path = "condition")
public String t1(int age) {
    return helloService.setByCondition(age);
}

@GetMapping(path = "unless")
public String t2(int age) {
    return helloService.setUnless(age);
}

@GetMapping(path = "exception")
public String exception(int age) {
    try {
        return String.valueOf(helloService.exception(age));
    } catch (Exception e) {
        return e.getMessage();
    }
}

@GetMapping(path = "cachePut")
public String cachePut(int age) {
    return helloService.cachePut(age);
}