Spring Boot集合redis的缓存简单配置

当没有用到redis缓存的时候，直接请求去库里拿数据时，会发现第一次请求比较久，可是后面再请求会变快一点，可是仍是快不了多少，可是，使用了redis缓存后，发现第一次请求比直接查库的时间还要久，可是后面再的请求，咱们会发现请求数据时间有的提高，若是在数据量很大的状况，差距也就愈来愈明显。

首先是依赖：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>

application.yaml:

redis:
    host: 127.0.0.1
    port: 6379
    password: xulifeng
    database: 0
    jedis:
      pool:
        max-idle: 10
        max-wait: -1
        min-idle: 0

Redis配置类：

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
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.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.time.Duration;


@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    @Override
    public KeyGenerator keyGenerator() {
        return (target, method, params) -> {
            StringBuilder sb = new StringBuilder();
            sb.append(target.getClass().getName());
            sb.append(method.getName());
            for (Object obj : params) {
                sb.append(obj.toString());
            }
            return sb.toString();
        };
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        //redis序列化
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        StringRedisTemplate template = new StringRedisTemplate(factory);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }

    /**
     * 自定义CacheManager
     */
    @Bean
    public CacheManager cacheManager(RedisTemplate redisTemplate) {
        //全局redis缓存过时时间
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofDays(1));
        RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisTemplate.getConnectionFactory());
        return new RedisCacheManager(redisCacheWriter, redisCacheConfiguration);
    }
}

Application启动类：

在启动类里加上注解，这样能够支持缓存

@EnableCaching

缓存基本注释：

@Cacheable：有缓存取缓存，没有则放入缓存

@CachePut：有缓存刷新缓存，没有则放入

@CacheEvict：有缓存则清除，能够指定在方法执行前仍是执行后清除