org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name已解決！

org.springframework.beans.factory.UnsatisfiedDependencyException

今天搭環境的時候遇到這個錯，浪費了我好久，類似下面這種錯誤
Error creating bean with name 'userController'
Error creating bean with name 'userService'
No qualifying bean of type 'xyz.nandu.dao.UserDao' available
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userController’: Unsatisfied dependency expressed through field ‘userService’; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userService’: Unsatisfied dependency expressed through field ‘userDao’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘xyz.nandu.dao.UserDao’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

網上方法很多，我看了半天，註解啊什麼都沒有問題，發現沒有加監聽器
解決方法:

1. 檢查對應的註解，確定都沒有問題
2. 檢查web.xml裏有沒有加spring的監聽器

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- 設置配置文件的路徑-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

加上試試，希望可以幫到大家！