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设计模式

3：抽象工厂模式的优缺点：

• (1) ：分离接口和实现
  client使用 抽象工厂来创建需要的对象，而client根本就不知道具体的实现是谁，client只是面向产品的接口编程而已，也就是说，client从具体的产品实现中解耦。
• (2) ：使切换产品族变得容易
  因为一个具体的工厂实现代表的是一个产品族，eg：Intel系列到AMD系列只需要切换一下具体工厂。
  ps：抽象工厂模式的缺点是不太容易扩展新的产品。如果需要给整个产品族添加一个新的产品，那就需要修改抽象工厂，这样就会导致修改所有的工厂实现类。

4：单例模式的优缺点：

• (1) ：实现方式
  控制一个类只被创建一个实例，问题就是要把创建实例的权限收回来，让类自身来负责，自己类实例的创建工作，然后由这个类来提供，外部可以访问这个类实例的方法。
• (1) ：分离接口和实现
  client使用 抽象工厂来创建需要的对象，而client根本就不知道具体的实现是谁，client只是面向产品的接口编程而已，也就是说，client从具体的产品实现中解耦。
• (2) ：使切换产品族变得容易
  因为一个具体的工厂实现代表的是一个产品族，eg：Intel系列到AMD系列只需要切换一下具体工厂。

ps：抽象工厂模式的缺点是不太容易扩展新的产品。如果需要给整个产品族添加一个新的产品，那就需要修改抽象工厂，这样就会导致修改所有的工厂实现类。

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2017-08-24 11:15:21.772 INFO 2996 — [ main] c.extracme.volvopark.netty.ServerStart : Starting ServerStart on DESKTOP-CBAH040 with PID 2996 (D:\java\space\evspring\volvo-tcpserver\target\classes started by alex in D:\java\space\evspring\volvo-tcpserver)
2017-08-24 11:15:21.772 INFO 2996 — [ main] c.extracme.volvopark.netty.ServerStart : No active profile set, falling back to default profiles: default
2017-08-24 11:15:21.819 INFO 2996 — [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@421dc8c8: startup date [Thu Aug 24 11:15:21 CST 2017]; root of context hierarchy
2017-08-24 11:15:22.600 INFO 2996 — [ main] o.s.b.f.xml.XmlBeanDefinitionReader : Loading XML bean definitions from class path resource [spring.xml]
2017-08-24 11:15:22.707 INFO 2996 — [ main] o.s.b.f.xml.XmlBeanDefinitionReader : Loading XML bean definitions from class path resource [spring-mybatis.xml]
2017-08-24 11:15:22.848 INFO 2996 — [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean ‘beanNameViewResolver’ with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfigurationWhitelabelErrorViewConfiguration;factoryMethodName=beanNameViewResolver;initMethodName=null;destroyMethodName=(inferred);definedinclasspathresource[org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfigurationWhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfigurationWebMvcAutoConfigurationAdapter;factoryMethodName=beanNameViewResolver;initMethodName=null;destroyMethodName=(inferred);definedinclasspathresource[org/springframework/boot/autoconfigure/web/WebMvcAutoConfigurationWebMvcAutoConfigurationAdapter.class]]
2017-08-24 11:15:22.912 WARN 2996 — [ main] o.m.s.mapper.ClassPathMapperScanner : No MyBatis mapper was found in ‘[com.extracme.volvopark.netty]’ package. Please check your configuration.
2017-08-24 11:15:23.373 INFO 2996 — [ main] o.s.b.f.c.PropertyPlaceholderConfigurer : Loading properties file from class path resource [application.properties]
2017-08-24 11:15:23.483 INFO 2996 — [ main] trationDelegateBeanPostProcessorChecker:Bean‘org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration′oftype[classorg.springframework.transaction.annotation.ProxyTransactionManagementConfigurationEnhancerBySpringCGLIBb37dacf1]isnoteligibleforgettingprocessedbyallBeanPostProcessors(forexample:noteligibleforauto−proxying)2017−08−2411:15:23.971INFO2996—[main]s.b.c.e.t.TomcatEmbeddedServletContainer:Tomcatinitializedwithport(s):8090(http)2017−08−2411:15:23.980INFO2996—[main]o.apache.catalina.core.StandardService:StartingserviceTomcat2017−08−2411:15:23.981INFO2996—[main]org.apache.catalina.core.StandardEngine:StartingServletEngine:ApacheTomcat/8.0.322017−08−2411:15:24.059INFO2996—[ost−startStop−1]o.a.c.c.C.[Tomcat].[localhost].[/]:InitializingSpringembeddedWebApplicationContext2017−08−2411:15:24.059INFO2996—[ost−startStop−1]o.s.web.context.ContextLoader:RootWebApplicationContext:initializationcompletedin2240ms2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.e.ServletRegistrationBean:Mappingservlet:‘dispatcherServlet′to[/]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘metricFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘characterEncodingFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘hiddenHttpMethodFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘httpPutFormContentFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘requestContextFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘webRequestLoggingFilter′to:[/∗]2017−08−2411:15:24.421INFO2996—[ost−startStop−1]o.s.b.c.embedded.FilterRegistrationBean:Mappingfilter:‘applicationContextIdFilter′to:[/∗]2017−08−2411:15:24.577INFO2996—[main]com.alibaba.druid.pool.DruidDataSource:dataSource−1inited2017−08−2411:15:24.749INFO2996—[main]o.s.s.concurrent.ThreadPoolTaskExecutor:InitializingExecutorService‘sendEmailExecutor′2017−08−2411:15:24.765WARN2996—[main]ationConfigEmbeddedWebApplicationContext:Exceptionencounteredduringcontextinitialization−cancellingrefreshattempt:org.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname‘stakeMsgHandler′:Injectionofautowireddependenciesfailed;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:privatecom.extracme.volvopark.netty.service.MsgControllercom.extracme.volvopark.netty.server.StakeMsgHandler.MsgController;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname‘msgController′:Injectionofautowireddependenciesfailed;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:com.extracme.volvopark.netty.iservice.IMsgServicecom.extracme.volvopark.netty.service.MsgController.msgService;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname‘msgService′:Injectionofautowireddependenciesfailed;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:privatecom.extracme.volvopark.netty.service.BrakeServicecom.extracme.volvopark.netty.service.MsgService.brakeService;nestedexceptionisjava.lang.IllegalArgumentException:Cannotsetcom.extracme.volvopark.netty.service.BrakeServicefieldcom.extracme.volvopark.netty.service.MsgService.brakeServicetocom.sun.proxy.Proxy62
2017-08-24 11:15:24.765 INFO 2996 — [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService ‘sendEmailExecutor’
2017-08-24 11:15:24.765 INFO 2996 — [ main] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} closed
2017-08-24 11:15:24.765 INFO 2996 — [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat
2017-08-24 11:15:24.780 ERROR 2996 — [ main] o.s.boot.SpringApplication : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘stakeMsgHandler’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.MsgController com.extracme.volvopark.netty.server.StakeMsgHandler.MsgController; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgController’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.extracme.volvopark.netty.iservice.IMsgService com.extracme.volvopark.netty.service.MsgController.msgService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgService’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.BrakeService com.extracme.volvopark.netty.service.MsgService.brakeService; nested exception is java.lang.IllegalArgumentException: Can not set com.extracme.volvopark.netty.service.BrakeService field com.extracme.volvopark.netty.service.MsgService.brakeService to com.sun.proxy.Proxy62atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)atorg.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)
at com.extracme.volvopark.netty.ServerStart.main(ServerStart.java:17)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.MsgController com.extracme.volvopark.netty.server.StakeMsgHandler.MsgController; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgController’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.extracme.volvopark.netty.iservice.IMsgService com.extracme.volvopark.netty.service.MsgController.msgService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgService’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.BrakeService com.extracme.volvopark.netty.service.MsgService.brakeService; nested exception is java.lang.IllegalArgumentException: Can not set com.extracme.volvopark.netty.service.BrakeService field com.extracme.volvopark.netty.service.MsgService.brakeService to com.sun.proxy.Proxy62atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
… 17 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgController’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.extracme.volvopark.netty.iservice.IMsgService com.extracme.volvopark.netty.service.MsgController.msgService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘msgService’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.BrakeService com.extracme.volvopark.netty.service.MsgService.brakeService; nested exception is java.lang.IllegalArgumentException: Can not set com.extracme.volvopark.netty.service.BrakeService field com.extracme.volvopark.netty.service.MsgService.brakeService to com.sun.proxy.Proxy62atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)atorg.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)atorg.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)…19commonframesomittedCausedby:org.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:com.extracme.volvopark.netty.iservice.IMsgServicecom.extracme.volvopark.netty.service.MsgController.msgService;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname‘msgService′:Injectionofautowireddependenciesfailed;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:privatecom.extracme.volvopark.netty.service.BrakeServicecom.extracme.volvopark.netty.service.MsgService.brakeService;nestedexceptionisjava.lang.IllegalArgumentException:Cannotsetcom.extracme.volvopark.netty.service.BrakeServicefieldcom.extracme.volvopark.netty.service.MsgService.brakeServicetocom.sun.proxy.Proxy62
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)atorg.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)…30commonframesomittedCausedby:org.springframework.beans.factory.BeanCreationException:Errorcreatingbeanwithname‘msgService′:Injectionofautowireddependenciesfailed;nestedexceptionisorg.springframework.beans.factory.BeanCreationException:Couldnotautowirefield:privatecom.extracme.volvopark.netty.service.BrakeServicecom.extracme.volvopark.netty.service.MsgService.brakeService;nestedexceptionisjava.lang.IllegalArgumentException:Cannotsetcom.extracme.volvopark.netty.service.BrakeServicefieldcom.extracme.volvopark.netty.service.MsgService.brakeServicetocom.sun.proxy.Proxy62
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:306)atorg.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)atorg.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)atorg.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)atorg.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
… 32 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.extracme.volvopark.netty.service.BrakeService com.extracme.volvopark.netty.service.MsgService.brakeService; nested exception is java.lang.IllegalArgumentException: Can not set com.extracme.volvopark.netty.service.BrakeService field com.extracme.volvopark.netty.service.MsgService.brakeService to com.sun.proxy.Proxy62atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
… 43 common frames omitted
Caused by: java.lang.IllegalArgumentException: Can not set com.extracme.volvopark.netty.service.BrakeService field com.extracme.volvopark.netty.service.MsgService.brakeService to com.sun.proxy.Proxy62atsun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)atsun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)atsun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)atjava.lang.reflect.Field.set(Field.java:741)atorg.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessorAutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:569)
… 45 common frames omitted

2017-08-24 11:15:24.796 INFO 2996 — [ main] com.alibaba.druid.pool.DruidDataSource : {dataSource-2} inited
2017-08-24 11:15:24.812 WARN 2996 — [ main] o.s.boot.SpringApplication : Error handling failed (Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [spring-mybatis.xml]: Cannot resolve reference to bean ‘dataSource’ while setting bean property ‘dataSource’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘dataSource’ defined in class path resource [spring-mybatis.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘dataSourceInitializer’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.boot.autoconfigure.jdbc.DataSourceProperties org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer.properties; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘spring.datasource.CONFIGURATION_PROPERTIES’: Initialization of bean failed; nested exception is java.lang.IllegalStateException: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@421dc8c8 has not been refreshed yet)
今天spring boot 加载一直报
No MyBatis mapper was found in ‘[com.extracme.volvopark.netty]’ package. Please check your configuration.
还以为是配置问题，最后解决方案是：注入的时候把接口的实现类注入了，
原： @Autowired
private BrakeService brakeService;
正确：
@Autowired
private IBrakeService brakeService;
ps:IBrakeService .class是接口；BrakeService 是其实现类

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1. 这里是 脚注 的 内容. ↩