org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ydwj.service.UserService' available

在做SSM项目进行测试时遇到的错误，错误太长我将完整的错误放在文章的最下面。
找不到可用的UserService bean，自动注入出错。我先在测试类中测试了一下Mapper 接口没有出现问题，问题一定出现在Service层，Spring没有扫描到相应的或者相关的类或接口。

• 首先检查一下SpringMVC.xml中是否对Service进行了扫描

 <context:component-scan base-package="com.ydwj.service"/>

• 然后检查是否定义了接口并且在你的ServiceIpml上是否加了@Service(“你自己对应的service”)注意首字母最好小写

@Service("userService")

• 绝大多数应该都是配置文件出现问题，主要检查一下与web相关的xml文件或者有的会定义applicationContext.xml将所有的配置文件都注入到这里，然后在web.xml文件中记得更改一下，

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value> </context-param>

还有监听器和dispatcherServelet的配置，引入文件是否正确。

<!--监听器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

我自己是在测试的时候只引入了Spring.xml 没有将SpringMVC.xml文件引入，我将新建了一个applicationContext.xml 将Spring相关xml的全部import进去。

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ydwj.service.UserService' available

	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:351)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:342)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1126)
	at Test.Test(Test.java:15)
	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:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)