1.引言

我們使用redis作為快取中介軟體時，當我們第一次查詢資料的時候，是去資料庫查詢，然後查到的資料封裝到實體類中，實體類會被序列化存入快取中，當第二次查資料時，會直接去快取中查詢被序列化的資料，然後反序列化被我們獲取。我們在快取中看到的序列化資料不直觀，如果想看到類似json的資料格式，就需要自定義序列化規則。

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主配置類要加上@EnableCaching註解

3.自定義序列化

@Configuration
public 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.測試

DeptService：

@Service
public class DeptService {
  @Autowired
  DepartmentMapper departmentMapper;
  @Cacheable(value = "dept")
  public Department findById(Integer id){
  System.out.println("查詢"+id+"號部門");
    Department department = departmentMapper.getDeptById(id);
    return department;
  }
}

EmployeeService：

@Service
public class EmployeeService {
  @Autowired
  EmployeeMapper employeeMapper;
 	@Cacheable(value = "emp")
  public Employee findById(Integer id){
    System.out.println("查詢"+id+"號員工");
    Employee employee = employeeMapper.getEmpById(id);
    return employee;
  }
}

@Cacheable(value = “dept”) ：該註解在方法上，方法傳入引數預設為key值，方法返回值為value值，註解的引數value = "dept"是快取的名子

結果：

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