Spring Boot集成redis,key自定义生成方式

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCachePrefix;
import org.springframework.data.redis.core.RedisTemplate; 
import com.alibaba.fastjson.JSON;
 
/**
 * redis配置工具类
 * @Configuration表示当前类属于配置类
 * @EnableCaching表示支持缓存
 * @author ouyangjun
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
 
    /**
     * redis key生成策略
     * target: 类
     * method: 方法
     * params: 参数
     * @return KeyGenerator
     * 注意: 该方法只是声明了key的生成策略,还未被使用,需在@Cacheable注解中指定keyGenerator
     *      如: @Cacheable(value = "key", keyGenerator = "cacheKeyGenerator")
     */
    @Bean
    public KeyGenerator cacheKeyGenerator() {
        return (target, method, params) -> {
            StringBuilder sb = new StringBuilder();
            sb.append(target.getClass().getName());
            sb.append(method.getName());
            for (Object obj : params) {
                // 由于参数可能不同, hashCode肯定不一样, 缓存的key也需要不一样
                sb.append(JSON.toJSONString(obj).hashCode());
            }
            return sb.toString();
        };
    }
 
    /**
     * redis全局默认配置
     * @param redisTemplate
     * @return
     */
    @Bean
    public CacheManager cacheManager(RedisTemplate<String, Object> redisTemplate) {
        RedisCacheManager redisCacheManager = new RedisCacheManager(redisTemplate);
        redisCacheManager.setUsePrefix(true);
        // key缓存的前缀,以conf开头
        RedisCachePrefix cachePrefix = new RedisPrefix("conf");
        redisCacheManager.setCachePrefix(cachePrefix);
        // key缓存的过期时间, 600秒
        redisCacheManager.setDefaultExpiration(600L);
        return redisCacheManager;
    }
}

package hk.com.cre.process.basic.service.impl; 
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable; 
public class RdisCacheTest {
 
    /**
     * 缓存测试
     * 缓存生成规则: conf:redis:类名方法名参数hashcode
     * 注意: @Cacheable注解生成的类型在redis中默认都是string
     *      在每次请求的时候,都是先根据key到redis查询是否存在,如不存在则执行方法中的代码
	 */
    @Cacheable(cacheNames = "redis", keyGenerator = "cacheKeyGenerator")
    public String getRedisString(String param1, String param2) {
        return param1+":"+param2;
    }
	
    /**
     * 清除缓存
     */
    @CacheEvict(cacheNames = "redis", allEntries = true)
    public String cleanCache() {
        return "success";
    }
}

Object generate(Object object, Method method, Object... params)

public class CustomKeyGenerator implements KeyGenerator {
    public Object generate(Object target, Method method, Object... params) {
        return target.getClass().getSimpleName() + "_"
          + method.getName() + "_"
          + StringUtils.arrayToDelimitedString(params, "_");
    }
}

@EnableCaching
@Configuration
public class ApplicationConfig extends CachingConfigurerSupport {
    @Bean
    public CacheManager cacheManager() {
        SimpleCacheManager cacheManager = new SimpleCacheManager();
        Cache booksCache = new ConcurrentMapCache("books");
        cacheManager.setCaches(Arrays.asList(booksCache));
        return cacheManager;
    }
    @Bean("customKeyGenerator")
    public KeyGenerator keyGenerator() {
        return new CustomKeyGenerator();
    }
}

@Component
public class BookService {
    @Cacheable(value = "books", keyGenerator = "customKeyGenerator")
    public List<Book> getBooks() {
        List<Book> books = new ArrayList<>();
        books.add(new Book("The Counterfeiters", "André Gide"));
        books.add(new Book("Peer Gynt and Hedda Gabler", "Henrik Ibsen"));
        return books;
    }
}