Spring Cache注解@Cacheable的九个属性详解

//这两种配置等价
@Cacheable(value = "user") //@Cacheable(cacheNames = "user")
User getUser(Integer id);

@Cacheable(value = "user",key = "#root.method.name")
User getUser(Integer id);

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();
            }
        };
    }
    /**
     * 支持 lambda 表达式编写
     */
    /*@Bean("myKeyGenerator")
    public KeyGenerator keyGenerator(){
        return ( target,  method, params)-> method.getName()+ Arrays.asList(params).toString();
    }*/
}

@Cacheable(value = "user",condition = "#id>0")//传入的 id 参数值>0才进行缓存
User getUser(Integer id);

@Cacheable(value = "user",condition = "#a0>1")//传入的第一个参数的值>1的时候才进行缓存
User getUser(Integer id);

@Cacheable(value = "user",condition = "#a0>1 and #root.methodName eq 'getUser'")//传入的第一个参数的值>1 且 方法名为 getUser 的时候才进行缓存
User getUser(Integer id);

@Cacheable(value = "user",unless = "#result == null")//当方法返回值为 null 时，就不缓存
User getUser(Integer id);

@Cacheable(value = "user",unless = "#a0 == 1")//如果第一个参数的值是1,结果不缓存
User getUser(Integer id);