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