本篇内容介绍了“springboot2.x怎么集成缓存注解及设置过期时间”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
/**
* 基于注解添加缓存
*/
@Configuration
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport {
private final RedisConnectionFactory redisConnectionFactory;
CacheConfig(RedisConnectionFactory redisConnectionFactory) {
this.redisConnectionFactory = redisConnectionFactory;
}
@Bean
@Override
public KeyGenerator keyGenerator() {
return (o, method, objects) -> {
StringBuilder sb = new StringBuilder(32);
sb.append(o.getClass().getSimpleName());
sb.append(".");
sb.append(method.getName());
if (objects.length > 0) {
sb.append("#");
}
String sp = "";
for (Object object : objects) {
sb.append(sp);
if (object == null) {
sb.append("NULL");
} else {
sb.append(object.toString());
}
sp = ".";
}
return sb.toString();
};
}
/**
* 配置 RedisCacheManager，使用 cache 注解管理 redis 缓存
*/
@Bean
@Override
public CacheManager cacheManager() {
// 初始化一个RedisCacheWriter
RedisCacheWriter cacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory);
// 设置默认过期时间：30 分钟
RedisCacheConfiguration defaultCacheConfig = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofMinutes(30))
// .disableCachingNullValues()
// 使用注解时的序列化、反序列化
.serializeKeysWith(MyRedisCacheManager.STRING_PAIR)
.serializeValuesWith(MyRedisCacheManager.FASTJSON_PAIR);
return new MyRedisCacheManager(cacheWriter, defaultCacheConfig);
}
}redis配置信息：@Configuration
@ConditionalOnClass(RedisOperations.class)
@EnableConfigurationProperties(RedisProperties.class)
@Import({LettuceConnectionConfiguration.class})
public class RedisConfig {
@Bean
@ConditionalOnMissingBean(name = "redisTemplate")
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
RedisTemplate<Object, Object> template = new RedisTemplate<>();
// set key serializer
StringRedisSerializer serializer = MyRedisCacheManager.STRING_SERIALIZER;
// 设置key序列化类，否则key前面会多了一些乱码
template.setKeySerializer(serializer);
template.setHashKeySerializer(serializer);
// fastjson serializer
GenericFastJsonRedisSerializer fastSerializer = MyRedisCacheManager.FASTJSON_SERIALIZER;
template.setValueSerializer(fastSerializer);
template.setHashValueSerializer(fastSerializer);
// 如果 KeySerializer 或者 ValueSerializer 没有配置，则对应的 KeySerializer、ValueSerializer 才使用这个 Serializer
template.setDefaultSerializer(fastSerializer);
// factory
template.setConnectionFactory(redisConnectionFactory);
template.afterPropertiesSet();
return template;
}
@Bean
@ConditionalOnMissingBean
public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
StringRedisTemplate template = new StringRedisTemplate();
template.setConnectionFactory(redisConnectionFactory);
return template;
}
}RedisCacheManager：public class MyRedisCacheManager extends RedisCacheManager implements ApplicationContextAware, InitializingBean {
private static final Logger LOGGER = LoggerFactory.getLogger(MyRedisCacheManager.class);
private ApplicationContext applicationContext;
private Map<String, RedisCacheConfiguration> initialCacheConfiguration = new LinkedHashMap<>();
/**
* key serializer
*/
public static final StringRedisSerializer STRING_SERIALIZER = new StringRedisSerializer();
/**
* value serializer
* <pre>
* 使用 FastJsonRedisSerializer 会报错：java.lang.ClassCastException
* FastJsonRedisSerializer<Object> fastSerializer = new FastJsonRedisSerializer<>(Object.class);
* </pre>
*/
public static final GenericFastJsonRedisSerializer FASTJSON_SERIALIZER = new GenericFastJsonRedisSerializer();
/**
* key serializer pair
*/
public static final RedisSerializationContext.SerializationPair<String> STRING_PAIR = RedisSerializationContext
.SerializationPair.fromSerializer(STRING_SERIALIZER);
/**
* value serializer pair
*/
public static final RedisSerializationContext.SerializationPair<Object> FASTJSON_PAIR = RedisSerializationContext
.SerializationPair.fromSerializer(FASTJSON_SERIALIZER);
public MyRedisCacheManager(RedisCacheWriter cacheWriter, RedisCacheConfiguration defaultCacheConfiguration) {
super(cacheWriter, defaultCacheConfiguration);
}
@Override
public Cache getCache(String name) {
Cache cache = super.getCache(name);
return new RedisCacheWrapper(cache);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
@Override
public void afterPropertiesSet() {
String[] beanNames = applicationContext.getBeanNamesForType(Object.class);
for (String beanName : beanNames) {
final Class clazz = applicationContext.getType(beanName);
add(clazz);
}
super.afterPropertiesSet();
}
@Override
protected Collection<RedisCache> loadCaches() {
List<RedisCache> caches = new LinkedList<>();
for (Map.Entry<String, RedisCacheConfiguration> entry : initialCacheConfiguration.entrySet()) {
caches.add(super.createRedisCache(entry.getKey(), entry.getValue()));
}
return caches;
}
private void add(final Class clazz) {
ReflectionUtils.doWithMethods(clazz, method -> {
ReflectionUtils.makeAccessible(method);
CacheExpire cacheExpire = AnnotationUtils.findAnnotation(method, CacheExpire.class);
if (cacheExpire == null) {
return;
}
Cacheable cacheable = AnnotationUtils.findAnnotation(method, Cacheable.class);
if (cacheable != null) {
add(cacheable.cacheNames(), cacheExpire);
return;
}
Caching caching = AnnotationUtils.findAnnotation(method, Caching.class);
if (caching != null) {
Cacheable[] cs = caching.cacheable();
if (cs.length > 0) {
for (Cacheable c : cs) {
if (cacheExpire != null && c != null) {
add(c.cacheNames(), cacheExpire);
}
}
}
} else {
CacheConfig cacheConfig = AnnotationUtils.findAnnotation(clazz, CacheConfig.class);
if (cacheConfig != null) {
add(cacheConfig.cacheNames(), cacheExpire);
}
}
}, method -> null != AnnotationUtils.findAnnotation(method, CacheExpire.class));
}
private void add(String[] cacheNames, CacheExpire cacheExpire) {
for (String cacheName : cacheNames) {
if (cacheName == null || "".equals(cacheName.trim())) {
continue;
}
long expire = cacheExpire.expire();
LOGGER.info("cacheName: {}, expire: {}", cacheName, expire);
if (expire >= 0) {
// 缓存配置
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.entryTtl(Duration.ofSeconds(expire))
.disableCachingNullValues()
// .prefixKeysWith(cacheName)
.serializeKeysWith(STRING_PAIR)
.serializeValuesWith(FASTJSON_PAIR);
initialCacheConfiguration.put(cacheName, config);
} else {
LOGGER.warn("{} use default expiration.", cacheName);
}
}
}
protected static class RedisCacheWrapper implements Cache {
private final Cache cache;
RedisCacheWrapper(Cache cache) {
this.cache = cache;
}
@Override
public String getName() {
// LOGGER.info("name: {}", cache.getName());
try {
return cache.getName();
} catch (Exception e) {
LOGGER.error("getName ---> errmsg: {}", e.getMessage(), e);
return null;
}
}
@Override
public Object getNativeCache() {
// LOGGER.info("nativeCache: {}", cache.getNativeCache());
try {
return cache.getNativeCache();
} catch (Exception e) {
LOGGER.error("getNativeCache ---> errmsg: {}", e.getMessage(), e);
return null;
}
}
@Override
public ValueWrapper get(Object o) {
// LOGGER.info("get ---> o: {}", o);
try {
return cache.get(o);
} catch (Exception e) {
LOGGER.error("get ---> o: {}, errmsg: {}", o, e.getMessage(), e);
return null;
}
}
@Override
public <T> T get(Object o, Class<T> aClass) {
// LOGGER.info("get ---> o: {}, clazz: {}", o, aClass);
try {
return cache.get(o, aClass);
} catch (Exception e) {
LOGGER.error("get ---> o: {}, clazz: {}, errmsg: {}", o, aClass, e.getMessage(), e);
return null;
}
}
@Override
public <T> T get(Object o, Callable<T> callable) {
// LOGGER.info("get ---> o: {}", o);
try {
return cache.get(o, callable);
} catch (Exception e) {
LOGGER.error("get ---> o: {}, errmsg: {}", o, e.getMessage(), e);
return null;
}
}
@Override
public void put(Object o, Object o1) {
// LOGGER.info("put ---> o: {}, o1: {}", o, o1);
try {
cache.put(o, o1);
} catch (Exception e) {
LOGGER.error("put ---> o: {}, o1: {}, errmsg: {}", o, o1, e.getMessage(), e);
}
}
@Override
public ValueWrapper putIfAbsent(Object o, Object o1) {
// LOGGER.info("putIfAbsent ---> o: {}, o1: {}", o, o1);
try {
return cache.putIfAbsent(o, o1);
} catch (Exception e) {
LOGGER.error("putIfAbsent ---> o: {}, o1: {}, errmsg: {}", o, o1, e.getMessage(), e);
return null;
}
}
@Override
public void evict(Object o) {
// LOGGER.info("evict ---> o: {}", o);
try {
cache.evict(o);
} catch (Exception e) {
LOGGER.error("evict ---> o: {}, errmsg: {}", o, e.getMessage(), e);
}
}
@Override
public void clear() {
// LOGGER.info("clear");
try {
cache.clear();
} catch (Exception e) {
LOGGER.error("clear ---> errmsg: {}", e.getMessage(), e);
}
}
}
}@GetMapping("/getShopByShopNO/{shopNo}")
public Mono<ShopDO> getShopByShopNO(@PathVariable("shopNo") final String shopNo){
final ShopDO shopByShopNO = shopDAO.getShopByShopNO(shopNo);
return Mono.just(shopByShopNO);
}
/**
* 查询店铺详情
* @param shopNo
* @return
*/
@Cacheable(value = "shop",key = "'shop_'.concat(#root.args[0])",sync = true)
@CacheExpire(30)
ShopDO getShopByShopNO(String shopNo);参考：https://www.cnblogs.com/wjwen/p/9301119.html
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