spring boot使用总结（四）在spring boot中使

1. 想要在spring boot中使用redis，只要在pom文件中增加如下的配置就可以了。

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

2. 引入spring－boot－redis jar包之后，选择相应的客户端配置连接就可以使用redis了，推荐使用Jedis。
```@Bean
JedisConnectionFactory connectionFactory() {
    return new JedisConnectionFactory();
}```

3. 配置完连接后，就可以使用redis进行简单的存取了。如果存取的key,value都是String的，可以使用
RedisTemplate<String, String>对象，该对象由spring boot自动扫描生成，在需要的地方可以直接注入。如果只是进行简单的存储，还可以生成
ValueOperations对象来方便操作。
```@Bean
ValueOperations<String, String> strOperations(RedisTemplate<String, String> redisTemplate) {
    return redisTemplate.opsForValue();
}```

4. 如果想要存取其他类型的对象，例如存取key为string，value为Integer类型的对象，可以new这个对象，然后配置连接即可使用。
```@Bean
RedisTemplate<String, Integer> intRedisTemplate(JedisConnectionFactory connectionFactory) {
    RedisTemplate<String, Integer> redisTemplate = new RedisTemplate<String, Integer>();
    redisTemplate.setConnectionFactory(connectionFactory);
    return redisTemplate;
}```

5. RedisTemplate对象默认使用jdkSerializer实现序列化，如果想要更换序列化的实现方式，例如使用json实现value的序列化，可以进行如下配置

```@Bean
Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer(ObjectMapper objectMapper) {
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(
            Object.class);
    jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
    return jackson2JsonRedisSerializer;
}

@Bean
RedisTemplate<String, Object> objRedisTemplate(JedisConnectionFactory connectionFactory,
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer) {
    RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
    redisTemplate.setConnectionFactory(connectionFactory);
    redisTemplate.setDefaultSerializer(jackson2JsonRedisSerializer);
    StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
    redisTemplate.setKeySerializer(stringRedisSerializer);
    redisTemplate.setHashKeySerializer(stringRedisSerializer);
    return redisTemplate;
}

最后附上上述操作的完整代码

@Configuration
public class RedisConfig {

    @Bean
    JedisConnectionFactory connectionFactory() {
        return new JedisConnectionFactory();
    }

    @Bean
    ValueOperations<String, String> strOperations(RedisTemplate<String, String> redisTemplate) {
        return redisTemplate.opsForValue();
    }

    @Bean
    RedisTemplate<String, Integer> intRedisTemplate(JedisConnectionFactory connectionFactory) {
        RedisTemplate<String, Integer> redisTemplate = new RedisTemplate<String, Integer>();
        redisTemplate.setConnectionFactory(connectionFactory);
        return redisTemplate;
    }

    @Bean
    ValueOperations<String, Integer> intOperations(RedisTemplate<String, Integer> redisTemplate) {
        return redisTemplate.opsForValue();
    }

    @Bean
    Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer(ObjectMapper objectMapper) {
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(
                Object.class);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
        return jackson2JsonRedisSerializer;
    }

    @Bean
    RedisTemplate<String, Object> objRedisTemplate(JedisConnectionFactory connectionFactory,
            Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<String, Object>();
        redisTemplate.setConnectionFactory(connectionFactory);
        redisTemplate.setDefaultSerializer(jackson2JsonRedisSerializer);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringRedisSerializer);
        redisTemplate.setHashKeySerializer(stringRedisSerializer);
        return redisTemplate;
    }

    @Bean
    ValueOperations<String, Object> objOperations(RedisTemplate<String, Object> redisTemplate) {
        return redisTemplate.opsForValue();
    }

}```

参考文档：
1.  http://docs.spring.io/spring-data/redis/docs/current/reference/html/
2.  http://docs.spring.io/spring-framework/docs/4.0.4.RELEASE/javadoc-api/org/springframework/context/annotation/Configuration.html
3. http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/Bean.html