spring初始化完成后執行初始化數據方法

Spring提供的解決方案三種：

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來配置Bean的話，可以指定屬性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) {
 //保證在web容器中只執行一次該事件
 if (event.getApplicationContext().getParent() == null) {
 Integer number = iVerifyNumberService.findAllNumber();
 System.out.println(number);
 }
 }
}

注意是監聽的ContextRefreshedEvent事件。

在web 項目中（spring mvc），系統會存在兩個容器，一個是root application context ,另一個就是我們自己的 projectName-servlet context（作為root application context的子容器）。這種情況下，就會造成onApplicationEvent方法被執行兩次。為了避免上面提到的問題，我們可以只在root application context初始化完成后調用邏輯代碼，其他的容器的初始化完成，則不做任何處理。

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());
 }
}

個人建議用第一種方法