我正在创建一个@Scheduled任务，每5秒运行一次。就像其他问题一样，我的任务运行了两次！

我查看了其他问题，并在此处阅读了适用的文档，但是我仍然无法解决问题。

我知道启动tomcat服务器时，将实例化我的类的 两个单独 实例@Scheduled。我还想出了何时参考我的日志文件实例化它们。

与该日志行关联的一个：

INFO：初始化Spring根WebApplicationContext

另一个与此日志行：

INFO：初始化Spring FrameworkServlet’servlet’

这是spring配置文件。

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
   xmlns:security="http://www.springframework.org/schema/security"
   xmlns:task="http://www.springframework.org/schema/task"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">

<context:component-scan base-package="web.controllers"/>
<context:component-scan base-package="services"/>
<context:component-scan base-package="dao"/>
<context:component-scan base-package="scheduled"/>
<context:property-placeholder location="/WEB-INF/application.properties"/>

<mvc:annotation-driven/>
<mvc:default-servlet-handler/>

<task:annotation-driven />

我的简单Java类：

package scheduled;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

@Service
public class Notifier {

@Scheduled(fixedDelay = 5000)
public void notifyUsersOfBidItems() {
    try {
        System.out.println(this);

    } catch (Exception e) {
        e.printStackTrace();
    }

}
}

另外，我正在使用Spring 4。

编辑： Adding web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
     version="3.0">
<display-name>Archetype Created Web Application</display-name>

<servlet>
    <servlet-name>servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring_config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>servlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

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

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring_config.xml</param-value>
</context-param>

<error-page>
    <error-code>404</error-code>
    <location>/error/notFound</location>
</error-page>

<error-page>
    <error-code>403</error-code>
    <location>/error/notFound</location>
</error-page>


<error-page>
    <location>/error/internal</location>
</error-page>

<!-- Spring Security -->
<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>