spring boot+redis 的快速入门

1.导入pom依赖

   项目依赖于spring boot parent 2.2.2.RELASE
1

 
        
            org.springframework.boot
            spring-boot-starter-data-redis
        
        
        
            org.apache.commons
            commons-pool2
        
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2.配置相关设置 application.yml

spring:
  redis:
    host: localhost
    port: 6379
    database: 0
    password:
    lettuce:
      pool:
        max-active: 20
        max-wait: -1
        max-idle: 8 #空闲最大连接数
        min-idle: 0

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3.编写config类 redis的缓存序列方案 （redis的数据是我们常见的jsong格式）

import lombok.extern.slf4j.Slf4j;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
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.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.io.Serializable;
import java.time.Duration;

/**
 * redis配置  使用lettuce连接池
 * */
@Configuration
@EnableCaching//开启缓存
@Slf4j
public class RedisConfig {
    @Bean
    //普通redis序列化
    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory){
        RedisTemplate<String,Serializable> redisTemplate=new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);
        //序列化自定义
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }
    //缓存序列化
    @Bean
    public CacheManager cacheManager(LettuceConnectionFactory connectionFactory){
        RedisCacheConfiguration conf=RedisCacheConfiguration.defaultCacheConfig()
                //过期时间 600s
                .entryTtl(Duration.ofSeconds(600))
                //序列化自定义
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()))
                .disableCachingNullValues();


        RedisCacheManager cacheManager=RedisCacheManager.builder(connectionFactory)
                .cacheDefaults(conf)
                .build();

        return cacheManager;
    }
}

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4.在代码中使用reids缓存 @Cacheable

 //前台热门老师展示 top 4
    @Cacheable(value = "index",key = "'getTopTeacher'") //redis的使用
    @Override
    public List<Teacher> getTopTeacher() {
        QueryWrapper<Teacher> teacherQueryWrapper=new QueryWrapper<>();
        teacherQueryWrapper.orderByDesc("sort");
        teacherQueryWrapper.last("limit 4");
        return teacherMapper.selectList(teacherQueryWrapper);
    }

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