这篇文章开始是想写springboot集成mybatis的，但是在需要创建一个dao的module时，才意识到创建的项目根本没有拆分任何module，所以决定本篇文章先将我的项目用到的module建出来，当前的项目目录如下：

下面简单展示一下创建过程：
1、在项目名称上右键选择new->module

2、弹出对话框，选择next
3、输入artifactId，点击next

4、由于我的artifactId中有横杠，生成的module name会把横杠去掉，与我的artifactId不一致，因此我手动给module name中加上了横杠，避免以后出现什么不必要的麻烦

5、点击finish，完成创建。

按照上面的步骤，又创建了first-controller包，并把config包、controller包、启动类分别移动到相应的module下，目前项目结构如下：

上面都处理完毕，开始启动服务，但是问题来了，启动服务之后swagger又报之前的错误了：

根据之前的经验，我在启动类Example.java中将@ComponentScan注释掉，将@EnableSwagger2放开：
但是启动时报出了新的错误：

2020-09-03 15:36:20.107  INFO 26628 --- [           main] Example                                  : Starting Example on LAPTOP-K6913KCN with PID 26628 (C:\Users\Lenovo\IdeaProjects2\firstTest\first-mian\target\classes started by Lenovo in C:\Users\Lenovo\IdeaProjects2\firstTest)
2020-09-03 15:36:20.112  INFO 26628 --- [           main] Example                                  : No active profile set, falling back to default profiles: default
2020-09-03 15:36:20.232  INFO 26628 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5cdd8682: startup date [Thu Sep 03 15:36:20 CST 2020]; root of context hierarchy
2020-09-03 15:36:20.301  WARN 26628 --- [           main] ionWarningsApplicationContextInitializer : ** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.2020-09-03 15:37:21.684  WARN 26628 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [Example]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/social/config/annotation/SocialConfigurerAdapter.class] cannot be opened because it does not exist
2020-09-03 15:37:21.697 ERROR 26628 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exceptionjava.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5cdd8682: startup date [Thu Sep 03 15:36:20 CST 2020]; root of context hierarchyat org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414) [spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030) [spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556) [spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at Example.main(Example.java:13) [classes/:na]2020-09-03 15:37:21.704  INFO 26628 --- [           main] utoConfigurationReportLoggingInitializer : Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2020-09-03 15:37:21.710 ERROR 26628 --- [           main] o.s.boot.SpringApplication               : Application startup failedorg.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [Example]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/social/config/annotation/SocialConfigurerAdapter.class] cannot be opened because it does not existat org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:270) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at Example.main(Example.java:13) [classes/:na]
Caused by: java.io.FileNotFoundException: class path resource [org/springframework/social/config/annotation/SocialConfigurerAdapter.class] cannot be opened because it does not existat org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:172) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:50) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:98) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.createMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:89) ~[spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.getMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:76) ~[spring-boot-1.5.5.RELEASE.jar:1.5.5.RELEASE]at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:93) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.asSourceClass(ConfigurationClassParser.java:693) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser$SourceClass.getSuperClass(ConfigurationClassParser.java:857) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:328) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:190) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:292) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]... 13 common frames omitted

经过一些查阅，发现应该和启动类放置的位置有关系，具体请参看下面的文章：
https://www.cnblogs.com/gudi/p/7892769.html

好了，知道原因就开始修改，首先在first-main、first-controller两个module中创建了gx.first包，然后将对应的内容分别移到这两个包中，移动后的工程目录结构如下：

都弄好了，起服务试试，swagger是可以正常打开了，但是找不到接口。这又是为什么呢，首先想到的是没有把first-controller引入到first-main中，所以加载不到，于是在first-main的pom文件中增加了first-controller的引入

<dependencies><dependency><groupId>gx.springboot.first</groupId><artifactId>first-controller</artifactId><version>1.0</version></dependency></dependencies>

加上之后再次重启，发现还是不显示接口，于是又去网上查，发现是swagger的配置类中指定了路径，而由于修改了包，因此之前配置的已经不对了

@Configuration
@EnableSwagger2
public class SwaggerConfig {@Beanpublic Docket createRestApi() {return new Docket(DocumentationType.SWAGGER_2).select()// 指定了swagger读取的包.apis(RequestHandlerSelectors.basePackage("controller")).paths(PathSelectors.any()).build();}
}

我能想到的，可以有两种方式进行修改
方式一：将包路径修改正确

.apis(RequestHandlerSelectors.basePackage("gx.first.controller"))

方式二：将设置包地址的这一行删掉
两者区别在于，第二种方式会将swagger默认的error接口也展示出来

问题解决了，但是还有一个思考，就是刚刚将first-controller引入到first-main的pom文件中对于swagger接口的显示是否是有作用的，为此我又特意将first-main的pom文件的dependency删掉，发现接口又不能展示了，于是结论是，需要把first-controller引入到first-main的pom文件。

好了，分包结束，下一篇文章可以真正集成mybatis了。