1. Auto Configuration

查看Spring-boot自身集成的配套类

找到 spring-boot-autoconfigure-2.3.4.RELEASE.jar 这个jar包，下面的META-INFO文件夹
找到spring.factories文件
在这个文件中搜索相关的关键字，如kafka，可以看kafka自动配置的入口类

自定义的 @Configuration如下

1.1. Kafka

CommonClientConfigs org.apache.kafka.clients.CommonClientConfigs

1.2. Log4j

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/deips/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/deips/.m2/repository/org/slf4j/slf4j-log4j12/1.7.30/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/deips/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.13.3/log4j-slf4j-impl-2.13.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

如上日志所未，找到了多个binding类，将不需要去除，日志中存在了3个StaticLoggerBinder类，要在maven中去除2个，只留下一个。

slf4j-log4j12/1.7.30
log4j-slf4j-impl/2.13.3
logback-classic/1.2.3 可以根据版本号来确认出maven的坐标，进行排除

1.3. Dubbo

1.3.1. Dubbo 3.0

dubbo>curator>zookeeper 这样的一种调用关系

1.4. Redis

从spring-boot-autoconfigure-2.3.4.RELEASE.jar中找到了redis相关的配置类

org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\

其中RedisAutoConfiguration中，用到了几个关键类 RedisProperties JedisConnectionConfiguration

@Configuration(
    proxyBeanMethods = false
)
@ConditionalOnClass({RedisOperations.class})
@EnableConfigurationProperties({RedisProperties.class})
@Import({LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class})
public class RedisAutoConfiguration {

而JedisConnectionConfiguration类中又使用到了如下类

@Configuration(
    proxyBeanMethods = false
)
@ConditionalOnClass({GenericObjectPool.class, JedisConnection.class, Jedis.class})
class JedisConnectionConfiguration extends RedisConnectionConfiguration {
    JedisConnectionConfiguration(RedisProperties properties, ObjectProvider<RedisSentinelConfiguration> sentinelConfiguration, ObjectProvider<RedisClusterConfiguration> clusterConfiguration) {
        super(properties, sentinelConfiguration, clusterConfiguration);
    }

    @Bean
    @ConditionalOnMissingBean({RedisConnectionFactory.class})
    JedisConnectionFactory redisConnectionFactory(ObjectProvider<JedisClientConfigurationBuilderCustomizer> builderCustomizers) throws UnknownHostException {
        return this.createJedisConnectionFactory(builderCustomizers);
    }

文件加载

使用Spring中的PathMatchingResourcePatternResolver类，来加载多个资源，这些资源是在包中的某个路径下：

sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(“classpath:auto/test/dal/mapper/xml/.xml”));

使用线程上下文的中类加载器，去加载资源，这个资源需要在resource目录下，这样maven打包后，数据才会和在根目录中

InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(“test.json”))