SpringBoot--配置Redis单机缓存

本是古典何须时尚 2021-08-24 17:12 393阅读 0赞

### 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：  
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