REDIS学习（3.2）spring boot 使用redis作为缓存

来源：互联网发布：量化分析师python日记编辑：程序博客网时间：2024/06/05 01:13

一，指定主键的生成规则

在3.1的基础上修改RedisConfig

@Configuration@EnableCachingpublic class RedisConfig extends CachingConfigurerSupport {@Beanpublic KeyGenerator smpkeyGenerator() {return new KeyGenerator() {@Overridepublic Object generate(Object target, Method method, Object... params) {StringBuilder sb = new StringBuilder();sb.append(target.getClass().getSimpleName());sb.append(method.getName());for (Object o : params) {sb.append("_").append(o.toString());}return sb.toString();}};<span style="white-space:pre"></span>} }

相关的方法要加上keyGenerator="smpkeyGenerator"

@Cacheable(value = "usercache", keyGenerator="smpkeyGenerator")public User getUser(String no,String name){LogCore.BASE.debug("invoke persistent:{},{}", no, name);return new User(no, name);}

如果不用keyGenerator的话可以直接使用SpEL表达式来描述key的生成规则

例如

@CacheEvict(value = "usercache", key="#no+'_'+#name")public boolean clearUser(String no,String name){LogCore.BASE.debug("invoke clear:{},{}", no, name);return true;}

http://localhost:8084/redis/test?name=lee&no=001

在redis存的键值为

usercache~keys

\xAC\xED\x00\x05t\x00\x1BRedisServicegetUser_001_lee

二，指定序列化方式

user去掉序列化标记接口serializable

public class User{public String no;public String name;

<span style="white-space:pre"></span>public User(){}public User(String no, String name) {this.no = no;this.name = name;}}

修改RedisConfig,增加CacheManager和RedisTemplate的bean注入

@Configuration@EnableCachingpublic class RedisConfig extends CachingConfigurerSupport {@Beanpublic CacheManager cacheManager(RedisTemplate<?, ?> redisTemplate) {RedisCacheManager manager = new RedisCacheManager(redisTemplate);manager.setDefaultExpiration(20);//设置默认过期时间return manager;}@Beanpublic RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {StringRedisTemplate template = new StringRedisTemplate(factory);Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);ObjectMapper om = new ObjectMapper();om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);jackson2JsonRedisSerializer.setObjectMapper(om);template.setValueSerializer(jackson2JsonRedisSerializer);template.afterPropertiesSet();return template;}@Beanpublic KeyGenerator smpkeyGenerator() {return new KeyGenerator() {@Overridepublic Object generate(Object target, Method method, Object... params) {StringBuilder sb = new StringBuilder();//sb.append(target.getClass().getSimpleName());//sb.append(method.getName());for (Object o : params) {sb.append("_").append(o.toString());}return sb.toString();}};}}

三，用SPEL表达式控制添加缓存的条件

如下：只有name不为null, 且返回结果不为null的时候才加入缓存

@Cacheable(value = "usercache", keyGenerator = "smpkeyGenerator",condition="#name!=null", unless = "#result==null")public User getUser(String no, String name) {LogCore.BASE.debug("invoke getUser:{},{}", no, name);if (Util.anyNonEmpty(no, name)) {return new User(no, name);}return null;}

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