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
 
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