@Cacheable(value = "dictionary#1800", key = "#root.targetClass.simpleName +':'+ #root.methodName +':'+ #code")
    public Object findByCode(String code) {
        //業(yè)務
    }

import org.springframework.cache.Cache;
import org.springframework.data.redis.cache.RedisCache;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.core.RedisOperations; 
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
 
public class MyRedisCacheManager extends RedisCacheManager {  
    /**
     * 過期時間分隔符
     */
    private static final String TTLSEPARATOR = "#";
    private final ConcurrentMap<String, Cache> cacheMap = new ConcurrentHashMap(16);
    /**
     * 過期時間, 單位為 秒
     */
    private long defaultExpiration = 0;  
    public MyRedisCacheManager(RedisOperations redisOperations) {
        super(redisOperations);
    } 
 
    @Override
    public Cache getCache(String name) { 
        long expiredTime = defaultExpiration;
        if (name.contains(TTLSEPARATOR)) {
            String[] split = name.split(TTLSEPARATOR);
            String cacheName = split[0];
            try {
                expiredTime = Double.valueOf(split[1]).longValue();
            } catch (Exception e) {
                e.printStackTrace();
            }
            Cache cache = this.cacheMap.get(name);
            if (cache != null) {
                return cache;
            } else {
                synchronized (this.cacheMap) {
                    cache = this.cacheMap.get(name);
                    if (cache == null) {
                        cache = new RedisCache(cacheName, null, super.getRedisOperations(), expiredTime);
                        if (cache != null) {
                            cache = this.decorateCache(cache);
                            this.cacheMap.put(name, cache);
                        }
                    }
 
                    return cache;
                }
            }
        } 
        return super.getCache(name);
    }  
}

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
 
@CacheConfig
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
 
    @Bean
    public CacheManager cacheManager(RedisTemplate redisTemplate) {
        //設置序列化Key的實例化對象
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        //設置序列化Value的實例化對象 
        ObjectMapper mapper = new ObjectMapper();
        mapper.findAndRegisterModules();
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
        GenericJackson2JsonRedisSerializer serializer = new GenericJackson2JsonRedisSerializer(mapper);
        redisTemplate.setValueSerializer(serializer);
        MyRedisCacheManager mrc = new MyRedisCacheManager(redisTemplate);
        return mrc;
    } 
}

 /**
  * Alias for {@link #cacheNames}.
  */
 @AliasFor("cacheNames")
 String[] value() default {};
 /**
  * Names of the caches in which method invocation results are stored.
  * <p>Names may be used to determine the target cache (or caches), matching
  * the qualifier value or bean name of a specific bean definition.
  * @since 4.2
  * @see #value
  * @see CacheConfig#cacheNames
  */
 @AliasFor("value")
 String[] cacheNames() default {};

 /**
  * Spring Expression Language (SpEL) expression for computing the key dynamically.
  * <p>Default is {@code ""}, meaning all method parameters are considered as a key,
  * unless a custom {@link #keyGenerator} has been configured.
  * <p>The SpEL expression evaluates against a dedicated context that provides the
  * following meta-data:
  * <ul>
  * <li>{@code #root.method}, {@code #root.target}, and {@code #root.caches} for
  * references to the {@link java.lang.reflect.Method method}, target object, and
  * affected cache(s) respectively.</li>
  * <li>Shortcuts for the method name ({@code #root.methodName}) and target class
  * ({@code #root.targetClass}) are also available.
  * <li>Method arguments can be accessed by index. For instance the second argument
  * can be accessed via {@code #root.args[1]}, {@code #p1} or {@code #a1}. Arguments
  * can also be accessed by name if that information is available.</li>
  * </ul>
  */
 String key() default "";

import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.lang.reflect.Method;
import java.util.Arrays;
@Configuration
public class MyCacheConfig {
    @Bean("myKeyGenerator")
    public KeyGenerator keyGenerator(){
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                return method.getName()+"["+ Arrays.asList(params).toString()+"]";
            }
        };
    }
}

@Cacheable(cacheNames = {"emp"},keyGenerator = "myKeyGenerator")

cacheManager指定緩存管理器
/**
  * The bean name of the custom {@link org.springframework.cache.CacheManager} to use to
  * create a default {@link org.springframework.cache.interceptor.CacheResolver} if none
  * is set already.
  * <p>Mutually exclusive with the {@link #cacheResolver}  attribute.
  * @see org.springframework.cache.interceptor.SimpleCacheResolver
  * @see CacheConfig#cacheManager
  */
 String cacheManager() default "";
 /**
  * The bean name of the custom {@link org.springframework.cache.interceptor.CacheResolver}
  * to use.
  * @see CacheConfig#cacheResolver
  */
 String cacheResolver() default "";

 /**
  * Spring Expression Language (SpEL) expression used for making the method
  * caching conditional.
  * <p>Default is {@code ""}, meaning the method result is always cached.
  * <p>The SpEL expression evaluates against a dedicated context that provides the
  * following meta-data:
  * <ul>
  * <li>{@code #root.method}, {@code #root.target}, and {@code #root.caches} for
  * references to the {@link java.lang.reflect.Method method}, target object, and
  * affected cache(s) respectively.</li>
  * <li>Shortcuts for the method name ({@code #root.methodName}) and target class
  * ({@code #root.targetClass}) are also available.
  * <li>Method arguments can be accessed by index. For instance the second argument
  * can be accessed via {@code #root.args[1]}, {@code #p1} or {@code #a1}. Arguments
  * can also be accessed by name if that information is available.</li>
  * </ul>
  */
 String condition() default "";

/**
  * Spring Expression Language (SpEL) expression used to veto method caching.
  * <p>Unlike {@link #condition}, this expression is evaluated after the method
  * has been called and can therefore refer to the {@code result}.
  * <p>Default is {@code ""}, meaning that caching is never vetoed.
  * <p>The SpEL expression evaluates against a dedicated context that provides the
  * following meta-data:
  * <ul>
  * <li>{@code #result} for a reference to the result of the method invocation. For
  * supported wrappers such as {@code Optional}, {@code #result} refers to the actual
  * object, not the wrapper</li>
  * <li>{@code #root.method}, {@code #root.target}, and {@code #root.caches} for
  * references to the {@link java.lang.reflect.Method method}, target object, and
  * affected cache(s) respectively.</li>
  * <li>Shortcuts for the method name ({@code #root.methodName}) and target class
  * ({@code #root.targetClass}) are also available.
  * <li>Method arguments can be accessed by index. For instance the second argument
  * can be accessed via {@code #root.args[1]}, {@code #p1} or {@code #a1}. Arguments
  * can also be accessed by name if that information is available.</li>
  * </ul>
  * @since 3.2
  */
 String unless() default "";

/**
  * Synchronize the invocation of the underlying method if several threads are
  * attempting to load a value for the same key. The synchronization leads to
  * a couple of limitations:
  * <ol>
  * <li>{@link #unless()} is not supported</li>
  * <li>Only one cache may be specified</li>
  * <li>No other cache-related operation can be combined</li>
  * </ol>
  * This is effectively a hint and the actual cache provider that you are
  * using may not support it in a synchronized fashion. Check your provider
  * documentation for more details on the actual semantics.
  * @since 4.3
  * @see org.springframework.cache.Cache#get(Object, Callable)
  */
 boolean sync() default false;

{@link #unless()} is not supported