spring初始化完成后执行初始化数据方法

Spring提供的解决方案三种：

1.InitializingBean

package com.foriseland.fsoa.fabricca;

import com.foriseland.fsoa.fabricca.service.IVerifyNumberService;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * @version V1.0
 * @Description
 * @Author ZhangYue
 * @Date 2018/4/12 11:58
 */
@Component
public class InitData2 implements InitializingBean {
    @Autowired
    private IVerifyNumberService iVerifyNumberService;
    /**
     * Invoked by a BeanFactory after it has set all bean properties supplied
     * (and satisfied BeanFactoryAware and ApplicationContextAware).
     * <p>This method allows the bean instance to perform initialization only
     * possible when all bean properties have been set and to throw an
     * exception in the event of misconfiguration.
     *
     * @throws Exception in the event of misconfiguration (such
     *                   as failure to set an essential property) or if initialization fails.
     */
    @Override
    public void afterPropertiesSet() throws Exception {
        Integer number = iVerifyNumberService.findAllNumber();
        System.out.println(number);
    }
}
若采用XML来配置Bean的话，可以指定属性init-method。
2.ApplicationListener

package com.foriseland.fsoa.fabricca;

import com.foriseland.fsoa.fabricca.service.IVerifyNumberService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;

/**
 * @version V1.0
 * @Description
 * @Author ZhangYue
 * @Date 2018/4/12 10:35
 */
@Component
public class InitData implements ApplicationListener<ContextRefreshedEvent> {

    @Autowired
    private IVerifyNumberService iVerifyNumberService;
    /**
     * Handle an application event.
     *
     * @param event the event to respond to
     */
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        //保证在web容器中只执行一次该事件
        if (event.getApplicationContext().getParent() == null) {
            Integer number = iVerifyNumberService.findAllNumber();
            System.out.println(number);
        }
    }
}

注意是监听的ContextRefreshedEvent事件。

在web 项目中（spring mvc），系统会存在两个容器，一个是root application context ,另一个就是我们自己的 projectName-servlet context（作为root application context的子容器）。这种情况下，就会造成onApplicationEvent方法被执行两次。为了避免上面提到的问题，我们可以只在root application context初始化完成后调用逻辑代码，其他的容器的初始化完成，则不做任何处理。

event.getApplicationContext().getParent() == null

3.@PostConstruct

package com.foriseland.fsoa.fabricca;

import com.foriseland.fsoa.fabricca.service.IVerifyNumberService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

/**
 * @version V1.0
 * @Description
 * @Author ZhangYue
 * @Date 2018/4/12 12:01
 */
@Component
public class InitData3  {
    @Autowired
    private IVerifyNumberService iVerifyNumberService;

    @PostConstruct
    public void testInit(){
        System.out.println(iVerifyNumberService.findAllNumber());
    }
}

个人建议用第一种方法

巴特西

spring初始化完成后执行初始化数据方法

Spring提供的解决方案三种：

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