springboot连接redis并动态切换database的实现方法

众所周知，redis多有个db，在jedis中可以使用select方法去动态的选择redis的database，但在springboot提供的StringRedisTemplate中确，没有该方法，好在StringRedisTemplate预留了一个setConnectionFactory方法，本文主为通过修改ConnectionFactory从而达到动态切换database的效果。

springboot连接redis

pom.xml文件中引入spring-boot-starter-redis,版本可自行选择

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-redis</artifactId>
    <version>1.3.8.RELEASE</version>
</dependency>

application.properties

#redis配置
spring.redis.database=0
spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=pwd
spring.redis.timeout=0
spring.redis.pool.max-active=8
spring.redis.pool.max-idle=8
spring.redis.pool.max-wait=-1
spring.redis.pool.min-idle=0

TestCRedis.java

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class TestCRedis{

    protected static Logger LOGGER = LoggerFactory.getLogger(TestCRedis.class);
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Test
    public void t1(){
        ValueOperations<String, String> stringStringValueOperations = stringRedisTemplate.opsForValue();
        stringStringValueOperations.set("testkey","testvalue");
        String testkey = stringStringValueOperations.get("testkey");
        LOGGER.info(testkey);
    }
}

运行TestCRedis.t1(),控制台打印“testvalue”redis连接成功

redis动态切换database

首先使用redis-cli,在redis的0、1、2三个库中，分别设置test 的值，分别为;0、1、2

TestCRedis.java

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = Application.class)
public class TestCRedis{

    protected static Logger LOGGER = LoggerFactory.getLogger(TestCRedis.class);
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Test
    public void t1(){
        ValueOperations<String, String> stringStringValueOperations = stringRedisTemplate.opsForValue();
        stringStringValueOperations.set("testkey","testvalue");
        String testkey = stringStringValueOperations.get("testkey");
        LOGGER.info(testkey);
    }
    public void t2() {
        for (int i = 0; i <= 2; i++) {
            JedisConnectionFactory jedisConnectionFactory = (JedisConnectionFactory) stringRedisTemplate.getConnectionFactory();
            jedisConnectionFactory.setDatabase(i);
            stringRedisTemplate.setConnectionFactory(jedisConnectionFactory);
            ValueOperations valueOperations = stringRedisTemplate.opsForValue();
            String test = (String) valueOperations.get("test");
            LOGGER.info(test);
        }
}

运行TestCRedis.t2(),控制台分别打印 “0、1、2”，database切换成功

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