spring boot之 Bean的初始化和销毁(4)

原文：https://blog.csdn.net/z3133464733/article/details/79189699

------------------------------------------------------------------------------------------------------------------------------------------

Spring @PostConstruct和@PreDestroy实例
https://www.cnblogs.com/soundcode/p/6367416.html

Spring Bean InitializingBean和DisposableBean实例
https://www.cnblogs.com/soundcode/p/6367410.html

Spring中的初始化InitializingBean接口和DisposableBean接口
https://blog.csdn.net/chenwiehuang/article/details/52594074

------------------------------------------------------------------------------------------------------------------------------------------

1.java形式的配置方式：使用@bean的initMethod和destorymethod等同于init-method、destory-method

java--Bean(还未交给spring管理)

package com.zh.ch2.prepost;
/**
* Bean的初始化和销毁
* 1.java形式的配置方式：使用@bean的initMethod和destorymethod等同于init-method、destory-method
* 2.注解方式：利用-250的@PostConstruct和@PreDestory
* @author Hiiso
*
*/
public class BeanWayService {
public void init(){
System.out.println("@Bean-init-method//1在构造函数执行完之后执行");
}
public BeanWayService() {
super();
System.out.println("初始化构造函数-BeanWayService");
}
public void destroy(){
System.out.println("@Bean-destory-method//2在bean销毁之前执行");
}
}
2.注解方式：利用-250的@PostConstruct和@PreDestory
java--Bean(还未交给spring管理)

package com.zh.ch2.prepost;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

public class JSR250WayService {
@PostConstruct //1在构造函数执行完之后执行
public void init(){
System.out.println("jsr250-init-method//1在构造函数执行完之后执行");
}
public JSR250WayService() {
super();
System.out.println("初始化构造函数-JSR250WayService");
}
@PreDestroy //2在bean销毁之前执行
public void destroy(){
System.out.println("jsr250-destory-method//2在bean销毁之前执行");
}

}
将bean 交由spring 管理
package com.zh.ch2.prepost;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan("com.zh.ch1.prepost")
public class PrePostConfig {

@Bean(initMethod="init",destroyMethod="destroy") //1
BeanWayService beanWayService(){
return new BeanWayService();
}

@Bean
JSR250WayService jsr250WayService(){
return new JSR250WayService();
}

}
测试：

package com.zh.ch2.prepost;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(PrePostConfig.class);
context.close();
}

}
结果：（1-6为执行顺序）
1.初始化构造函数-BeanWayService

2.@Bean-init-method//1在构造函数执行完之后执行

3.初始化构造函数-JSR250WayService

4.jsr250-init-method//1在构造函数执行完之后执行

5.jsr250-destory-method//2在bean销毁之前执行

6.@Bean-destory-method//2在bean销毁之前执行