如何在Spring 3中配置自定义触发器？

import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.support.PeriodicTrigger;

public class CustomTrigger implements Trigger {
    // 在此实现自定义触发器逻辑
}

<bean id="customTrigger" class="com.example.CustomTrigger" />

@Configuration
public class AppConfig {
    @Bean
    public CustomTrigger customTrigger() {
        return new CustomTrigger();
    }
}

<task:scheduled-tasks scheduler="scheduler">
    <task:scheduled ref="myTask" method="execute" trigger="customTrigger" />
</task:scheduled-tasks>

<bean id="myTask" class="com.example.MyTask" />

<bean id="scheduler" class="org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler" />

@Configuration
@EnableScheduling
public class AppConfig {
    @Bean
    public MyTask myTask() {
        return new MyTask();
    }

    @Bean
    public ThreadPoolTaskScheduler scheduler() {
        return new ThreadPoolTaskScheduler();
    }

    @Bean
    public CustomTrigger customTrigger() {
        return new CustomTrigger();
    }

    @Scheduled(trigger = "customTrigger")
    public void executeTask() {
        myTask().execute();
    }
}