Redis单机缓存
如果在classpath下存在Redis并且Redis已经配置好了，此时默认就会使用RedisCacheManager作为缓存提供者。
1. 创建项目，添加缓存依赖：
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<artifactId>lettuce-core</artifactId>
<groupId>io.lettuce</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
2. 缓存配置：
# 过期时间
spring.cache.redis.time-to-live=1800s
# Redis数据库索引（默认为0）
spring.redis.database=0
# Redis服务器地址
spring.redis.host=localhost
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空）
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.jedis.pool.max-active=8
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.jedis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=8
# 连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=0
3. 项目入口开启缓存：
@EnableCaching
@MapperScan("pers.zhang.sb_cache.mapper")
@SpringBootApplication
public class SbCacheApplication {
public static void main(String[] args) {
SpringApplication.run(SbCacheApplication.class, args);
}
}
4. Mapper:
@Mapper
public interface EmployeeMapper {
@Select("select * from employee where id = #{id}")
Employee getEmpById(Integer id);
}
5. Service:
@Service
public class EmployeeService {
@Autowired
EmployeeMapper employeeMapper;
@Cacheable(cacheNames = "emp", key = "#id")
public Employee getEmp(Integer id){
System.out.println("查询" + id + "号员工");
Employee emp = employeeMapper.getEmpById(id);
return emp;
}
}
6. Controller:
@RestController
public class EmployeeController {
@Autowired
EmployeeService employeeService;
@GetMapping("/emp/{id}")
public Employee getEmployee(@PathVariable("id") Integer id){
Employee emp = employeeService.getEmp(id);
return emp;
}
}
7. 配置序列化方式为JSON：
@Configuration
public class MyRedisConfig {
@Bean
public CacheManager cacheManager(RedisConnectionFactory factory){
RedisSerializer<String> redisSerializer = new StringRedisSerializer();
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
//解决查询缓存异常的问题
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
//配置序列化
RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig()
.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
.disableCachingNullValues();
RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
.cacheDefaults(configuration)
.build();
return cacheManager;
}
}
8. 测试：
