1.引言

我们使用redis作为缓存中间件时，当我们第一次查询数据的时候，是去数据库查询，然后查到的数据封装到实体类中，实体类会被序列化存入缓存中，当第二次查数据时，会直接去缓存中查找被序列化的数据，然后反序列化被我们获取。我们在缓存中看到的序列化数据不直观，如果想看到类似json的数据格式，就需要自定义序列化规则。

2.整合redis

pom.xml:

<!--引入redis--> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>2.3.0.RELEASE</version> </dependency> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> </dependency>

application.yml：

spring: redis: host: 192.168.85.130 port: 6379 database: 0

springboot主配置类要加上@EnableCaching注解

3.自定义序列化

@Configurationpublic class MyRedisConfig { @Bean public RedisTemplate<Object, Object> empRedisTemplate(RedisConnectionFactory redisConnectionFactory)throws UnknownHostException { RedisTemplate<Object,Object> template = new RedisTemplate<>(); template.setConnectionFactory(redisConnectionFactory); Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<Object>(Object.class); template.setDefaultSerializer(serializer); return template; } @Bean public CacheManager cacheManager(RedisConnectionFactory factory){ RedisCacheConfiguration cacheConfiguration = RedisCacheConfiguration.defaultCacheConfig() .entryTtl(Duration.ofDays(1)) .disableCachingNullValues() .serializeKeysWith(RedisSerializationContext.SerializationPair .fromSerializer(new StringRedisSerializer())) .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer())); return RedisCacheManager.builder(factory).cacheDefaults(cacheConfiguration).build();}}

4.测试

DeptService：

@Servicepublic class DeptService { @Autowired DepartmentMapper departmentMapper; @Cacheable(value = "dept") public Department findById(Integer id){ System.out.println("查询"+id+"号部门"); Department department = departmentMapper.getDeptById(id); return department; }}

EmployeeService：

@Servicepublic class EmployeeService { @Autowired EmployeeMapper employeeMapper; @Cacheable(value = "emp") public Employee findById(Integer id){ System.out.println("查询"+id+"号员工"); Employee employee = employeeMapper.getEmpById(id); return employee; }}

@Cacheable(value = “dept”) ：该注解在方法上，方法传入参数默认为key值，方法返回值为value值，注解的参数value = "dept"是缓存的名子

结果：

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