Spring mvc 注解@Service

[qq_27118525]

@Service注解一般里面都要给个value参数的， 通常会这样@Service("userService")来注解

我看到别人直接@Service 是怎么实现的？

[菜 头]

不跟值也可以用呀，默认就是你class名，首字母为小写

[花谢尊前不敢香]

默认是类名首字母小写。

[qq_27118525]

可是我不加就报错 2016-11-21 16:56:18,226[DEBUG RMI TCP Connection(3)-127.0.0.1](springframework.transaction.interceptor.NameMatchTransactionAttributeSource: 96) Adding transactional method

• with attribute
• [PROPAGATION_REQUIRED,ISOLATION_DEFAULT,-Throwable] 2016-11-21 16:56:18,347[DEBUG RMI TCP Connection(3)-127.0.0.1](beans.factory.annotation.InjectionMetadata: 72) Registered injected element on class [com.mydream.log.annotation.SystemLogAspect]: AutowiredFieldElement for private com.mydream.log.service.IOperationLogService com.mydream.log.annotation.SystemLogAspect.operationLogService 2016-11-21 16:56:18,359[DEBUG RMI TCP Connection(3)-127.0.0.1](beans.factory.annotation.InjectionMetadata: 86) Processing injected element of bean 'systemLogAspect': AutowiredFieldElement for private com.mydream.log.service.IOperationLogService com.mydream.log.annotation.SystemLogAspect.operationLogService 2016-11-21 16:56:18,373[ WARN RMI TCP Connection(3)-127.0.0.1](web.context.support.XmlWebApplicationContext:549) Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'systemLogAspect': Unsatisfied dependency expressed through field 'operationLogService'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.mydream.log.service.IOperationLogService] is defined: expected single matching bean but found 2: operationLogServiceImpl,IOperationLogService 2016-11-21 16:56:18,378[ INFO RMI TCP Connection(3)-127.0.0.1](springframework.scheduling.concurrent.ThreadPoolTaskScheduler:203) Shutting down ExecutorService 'qbScheduler' 2016-11-21 16:56:18,391[ERROR RMI TCP Connection(3)-127.0.0.1](springframework.web.context.ContextLoader:351) Context initialization failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'systemLogAspect': Unsatisfied dependency expressed through field 'operationLogService'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.mydream.log.service.IOperationLogService] is defined: expected single matching bean but found 2: operationLogServiceImpl,IOperationLogService at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:569) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:349) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1219) 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.AbstractBeanFactory$1.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:751) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) 21-Nov-2016 16:56:18.400 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) 21-Nov-2016 16:56:18.401 SEVERE [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4842) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5303) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1696) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:484) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:433) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:828) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323) at sun.rmi.transport.Transport$1.run(Transport.java:178) at sun.rmi.transport.Transport$1.run(Transport.java:175) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:174) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.mydream.log.service.IOperationLogService] is defined: expected single matching bean but found 2: operationLogServiceImpl,IOperationLogService at org.springframework.beans.factory.config.DependencyDescriptor.resolveNotUnique(DependencyDescriptor.java:172) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1106) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1056) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:566) ... 58 more

[小生--幻]

你一个接口有多个实现类当然需要命名，不然容器注入的时候不知道用哪个，如果只有一个实现类你就可以不用在@Service里面写名字了