REDIS学习（3.2）spring boot 使用redis作为缓存

一，指定主键的生成规则

在3.1的基础上修改RedisConfig

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
   @Bean
   public KeyGenerator smpkeyGenerator() {
       return new KeyGenerator() {
           @Override
           public 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
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
   @Bean
   public CacheManager cacheManager(RedisTemplate<?, ?> redisTemplate) {
       RedisCacheManager manager = new RedisCacheManager(redisTemplate);
       manager.setDefaultExpiration(20);//设置默认过期时间
       return manager;
   }

   @Bean
   public 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;
   }

   @Bean
   public KeyGenerator smpkeyGenerator() {
       return new KeyGenerator() {
           @Override
           public 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;
   }

原文：https://blog.csdn.net/kkgbn/article/details/52103345

REDIS学习（3.2）spring boot 使用redis作为缓存

猜你喜欢