RedisTemplate的RedisConnectionFactory底层的默认设置

你知道spring boot项目中yml配置文件中不配置redis的连接信息，启动本地的redis服务，能连接吗？答案是可以连接的的，why？以下给你揭秘。

/**
     * RedisTemplate配置
     * @param
     * @return
     */
    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        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);// 需要配置一下StringSerializer,不然key会乱码 /XX/XX
        template.afterPropertiesSet();
        return template;
    }

/**
* Thread-safe factory of Redis connections.
*
* @author Costin Leau
* @author Christoph Strobl
*/
public interface RedisConnectionFactory extends PersistenceExceptionTranslator {

/**
* Provides a suitable connection for interacting with Redis.
*
* @return connection for interacting with Redis.
*/
RedisConnection getConnection();

/**
* Provides a suitable connection for interacting with Redis Cluster.
*
* @return
* @throws
* @since 1.7
*/
RedisClusterConnection getClusterConnection();




public class JedisConnectionFactory implements InitializingBean, DisposableBean, RedisConnectionFactory {

private final static Log log = LogFactory.getLog(JedisConnectionFactory.class);
private static final ExceptionTranslationStrategy EXCEPTION_TRANSLATION = new PassThroughExceptionTranslationStrategy(
JedisConverters.exceptionConverter());

private static final Method SET_TIMEOUT_METHOD;
private static final Method GET_TIMEOUT_METHOD;

static {

// We need to configure Jedis socket timeout via reflection since the method-name was changed between releases.
Method setTimeoutMethodCandidate = ReflectionUtils.findMethod(JedisShardInfo.class, "setTimeout", int.class);
if (setTimeoutMethodCandidate == null) {
// Jedis V 2.7.x changed the setTimeout method to setSoTimeout
setTimeoutMethodCandidate = ReflectionUtils.findMethod(JedisShardInfo.class, "setSoTimeout", int.class);
}
SET_TIMEOUT_METHOD = setTimeoutMethodCandidate;

Method getTimeoutMethodCandidate = ReflectionUtils.findMethod(JedisShardInfo.class, "getTimeout");
if (getTimeoutMethodCandidate == null) {
getTimeoutMethodCandidate = ReflectionUtils.findMethod(JedisShardInfo.class, "getSoTimeout");
}

GET_TIMEOUT_METHOD = getTimeoutMethodCandidate;
}

private JedisShardInfo shardInfo;
private String hostName = "localhost";
private int port = Protocol.DEFAULT_PORT;
private int timeout = Protocol.DEFAULT_TIMEOUT;
private String password;
private boolean usePool = true;
private boolean useSsl = false;
private Pool<Jedis> pool;
private JedisPoolConfig poolConfig = new JedisPoolConfig();
private int dbIndex = 0;
private String clientName;
private boolean convertPipelineAndTxResults = true;
private RedisSentinelConfiguration sentinelConfig;
private RedisClusterConfiguration clusterConfig;
private JedisCluster cluster;
private ClusterCommandExecutor clusterCommandExecutor;





public final class Protocol {

  private static final String ASK_RESPONSE = "ASK";
  private static final String MOVED_RESPONSE = "MOVED";
  private static final String CLUSTERDOWN_RESPONSE = "CLUSTERDOWN";
  private static final String BUSY_RESPONSE = "BUSY";
  private static final String NOSCRIPT_RESPONSE = "NOSCRIPT";

  public static final String DEFAULT_HOST = "localhost";
  public static final int DEFAULT_PORT = 6379;
  public static final int DEFAULT_SENTINEL_PORT = 26379;
  public static final int DEFAULT_TIMEOUT = 2000;
  public static final int DEFAULT_DATABASE = 0;

  public static final String CHARSET = "UTF-8";

  public static final byte DOLLAR_BYTE = '$';
  public static final byte ASTERISK_BYTE = '*';
  public static final byte PLUS_BYTE = '+';
  public static final byte MINUS_BYTE = '-';
  public static final byte COLON_BYTE = ':';

  public static final String SENTINEL_MASTERS = "masters";
  public static final String SENTINEL_GET_MASTER_ADDR_BY_NAME = "get-master-addr-by-name";
  public static final String SENTINEL_RESET = "reset";
  public static final String SENTINEL_SLAVES = "slaves";
  public static final String SENTINEL_FAILOVER = "failover";
  public static final String SENTINEL_MONITOR = "monitor";
  public static final String SENTINEL_REMOVE = "remove";
  public static final String SENTINEL_SET = "set";

看到没？底层框架就默认连接了private String hostName = "localhost";和
  public static final int DEFAULT_PORT = 6379;