Spring boot 2.x 中使用redis

一、添加Maven  依赖

　　　　 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

二.application.yml 中配置 redis 相关配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/order?serverTimezone=GMT%2B8&characterEncoding=UTF-8
    username: root
    password: xxxxxx
  redis:
    host: ip
    database: 0
    port: 6379
    password:

jdbc4.0 是不用显式的去加载驱动，如果驱动包符合 SPI 模式就会自动加载
就是说程序会自动去项目中查找是否有驱动，当然没有驱动的话自然是连接不了的

三、写一个 redis 配置类

redis 默认的是使用JDK 的序列化方式。

JdkSerializationRedisSerializer

当保存实体后，Redis 中的实体信息乱码，需要修改redis 默认的序列化方式，创建RedisConfig 配置文件

@Configuration
public class RedisConfig {

    //设置过期时间
    public static Duration liveTime = Duration.ofDays(1);

    @Bean
    public RedisCacheManager redisCacheManager(RedisConnectionFactory connectionFactory){
        RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig().entryTtl(liveTime)
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()))
                .disableCachingNullValues();
        RedisCacheManager redisCacheManager = RedisCacheManager.builder(connectionFactory)
                .cacheDefaults(cacheConfiguration).transactionAware().build();
        return redisCacheManager;
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<String, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);

        //细化序列化
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());

        //修改默认序列化器
       /* Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
        template.setDefaultSerializer(serializer);*/
        return template;
    }

}

四、使用注解的方式使用Redis

@Service
public class EmpService {

    @Autowired
    private EmpMapper empMapper;

    @Cacheable(cacheNames = {"emp"})
    public Emp getEnp(int id){
        return empMapper.getEmpById(id);
    }

    @CachePut
    public int insertEmp(Emp emp){
        return empMapper.insertEmp(emp);
    }

    @CacheEvict(beforeInvocation = false,value = "emp")
    public int delEmp(int id){
         empMapper.delEmp(id);
         return 1;
    }

    @CachePut(key = "#p0.id",value = "emp")
    public Emp updateEmp(Emp emp){
        empMapper.updateEmp(emp);
        return emp;
    }

}