spring 緩存 spel表達式

參考https://blog.csdn.net/yangshangwei/article/details/78157834#spel表達式

在項目中遇到需要根據部分參數來生成緩存key.配置如下：

@Cacheable(key="'selectprovincebyprimarykey_' + #provinceid")

注意在雙引號中常量string是用單引號括起來的。

1.其它key是使用自定義的類來生成key

import java.lang.reflect.Method;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.cache.interceptor.KeyGenerator;

public class KeyGeneratorService implements KeyGenerator {

	protected final Logger logger = Logger.getLogger(this.getClass());

	@Override
	public Object generate(Object target, Method method, Object... params) {
		String key = method.getName().toLowerCase() + "_" + StringUtils.join(params, "_");
		logger.debug("KEY:" + key);
		return key;
	}

	public static void main(String[] args) {

	}
}

2.配置緩存驅動如下:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cache="http://www.springframework.org/schema/cache"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
   http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://www.springframework.org/schema/cache 
    http://www.springframework.org/schema/cache/spring-cache.xsd">

	<bean id="KeyGeneratorService" class="com.xxx.xxx.service.KeyGeneratorService" />
	<cache:annotation-driven key-generator="KeyGeneratorService" />
	<!-- spring自己的換管理器，這裏定義了兩個緩存位置名稱 ，既註解中的value -->
	<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
		<property name="caches">
			<set>
				<bean
					class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
					p:name="default" />
				<bean
					class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean"
					p:name="config" />
				<bean
					
		</property>
	</bean>
</beans>