Java Spring Scheduled作業不起作用

Question

我有一個應該運行預定代碼的Web應用程序：

package com.myproject.daemon.jobs;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class MyDaemonJob  {

    private static final Logger log = LoggerFactory.getLogger(MyDaemonJob.class);

    @PostConstruct
    public void init() {
        log.info("MyDaemonJob is intialized " );
    }

    @Scheduled(fixedDelay = 1000)
    public void startDaemon()  {
        try {
            log.info("MyDaemonJob is running ...");
        } catch (Exception e) {
            log.error("Encountered error running scheduled job: " + e.getMessage());
        }
    }
}

正如我從PostConstruct日志中看到的那樣，它肯定被識別為Spring bean並已初始化。 但是，帶有@Scheduled批注的方法永遠不會運行，盡管它應該每1秒運行一次。

這是應用程序上下文xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
                       http://www.springframework.org/schema/beans/spring-beans.xsd
                       http://www.springframework.org/schema/context
                       http://www.springframework.org/schema/context/spring-context-4.0.xsd">

<context:component-scan base-package="
    com.myproject.daemon.jobs,
    com.myproject.product" />

</beans>

Answer 1

謝謝大家的快速幫助。 這真的很有幫助。

一旦我添加了帶有注釋的config類，代碼就開始工作，如下所示-

package com.myproject;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;

@Configuration
@EnableScheduling
public class AppConfig {
    // various @Bean definitions
}

Answer 2

要使用@scheduled批注，必須在spring bean配置xml文件中包含spring任務名稱空間。 您可以在xml配置文件中更新以下名稱空間。

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                       http://www.springframework.org/schema/beans/spring-beans.xsd
                       http://www.springframework.org/schema/context
                       http://www.springframework.org/schema/context/spring-context-4.0.xsd
                       http://www.springframework.org/schema/task 
                       http://www.springframework.org/schema/task/spring-task-4.1.xsd">

否則，如果您使用spring-boot應用程序，則可以在配置文件中包含@EnableScheduling