Learning Spring Boot: (17) Using Redis in Spring Boot

foreword

Redis 1 is a key-value storage system written by Salvatore Sanfilippo.
Edis is an open source log-type, Key-Value database written in ANSI C language, complying with BSD protocol, supporting network, memory-based and persistent, and providing APIs in multiple languages.
Often referred to as a data structure server because values ​​can be of types such as String, Hash (Map), list (list), sets (sets) and sorted sets (sorted sets).

• Redis official website
• Redis Chinese Community

text

import dependencies

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

It should be noted that the above is the name after the Spring Boot 1.5version before version 1.5 spring-boot-starter-redis.

parameter configuration

spring:
  redis:
    host: 192.168.19.200 # host ,默认 localhost
    port: 6379 # 端口号，默认6379
    pool:
    # 设置都是默认值，可以按需求设计
      max-active: 8 # 可用连接实例的最大数目，默认值为8；如果赋值为-1，则表示不限制；
      max-idle: 8  # 控制一个pool最多有多少个状态为idle(空闲的)的redis实例，默认值也是8。
      max-wait: -1 # 等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。
      min-idle: 0 # 控制一个pool最少有多少个状态为idle(空闲的)的redis实例，默认值为0。
    timeout: 0 # 连接超时时间 单位 ms，默认为0
    password: master # 密码，根据自己的 redis 设计，默认为空

use

Register a configuration class RedisTemplateto support serialization and deserialization:

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        // 使用 Jackson2JsonRedisSerializer 进行序列化，它继承 RedisSerializer，
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }

}

Test using:

@SpringBootTest
@RunWith(SpringRunner.class)
public class RedisTest {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void test() {
        stringRedisTemplate.opsForValue().set("id", "1");
        Assert.assertEquals("1", stringRedisTemplate.opsForValue().get("id"));
    }

    /**
     * 测试存储对象，redis 需要对对象进行序列化，取出对象数据后比对，又要进行反序列化
     * 所以注册了 RedisTemplate ，专门处理这类情况
     */
    @Test
    public void test1() {
        SysUserEntity sysUserEntity = new SysUserEntity();
        sysUserEntity.setId(2L);
        sysUserEntity.setEmail("[email protected]");
        ValueOperations<String, SysUserEntity> operations = redisTemplate.opsForValue();
        operations.set("user1", sysUserEntity);
        Assert.assertThat(sysUserEntity, Matchers.equalTo(operations.get("user1")));
    }

}

Spring Data Redis usage documentation

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