Spring之IOC容器的生命周期

1.实体类

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Calendar;

public class Car {
    
    private String brand;
    
    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }
    public void init() throws IOException{
        BufferedWriter bw = null;
        try {
            bw = new BufferedWriter(new FileWriter("./a.txt",true));
            
            bw.write("method init "+Calendar.HOUR+":"+Calendar.MINUTE+":"+Calendar.SECOND+":"+Calendar.MILLISECOND);
            bw.flush();
            bw.newLine();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            bw.close();
        }
    }
        
    public void destroy() throws IOException{
        BufferedWriter bw = null;
        try {
            bw = new BufferedWriter(new FileWriter("./a.txt",true));
            
            bw.write("method destroy "+Calendar.HOUR+":"+Calendar.MINUTE+":"+Calendar.SECOND+":"+Calendar.MILLISECOND);
            bw.flush();
            bw.newLine();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            bw.close();
        }
    }

}

2.XML文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <bean id="car" class="com.auguigu.spring.beans.cycle.Car" init-method="init" destroy-method="destroy">
        <property name="brand" value="Audi"></property>
    </bean>
</beans>

3.测试Main

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    
    public static void main(String[] args) {
        
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("./beans-cycle.xml");
        Car car = (Car) ctx.getBean("car");
        System.out.println(car);
        ctx.close();
        
    }

}

4.输出结果：

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
com.auguigu.spring.beans.cycle.Car@32dcb03b
file.txt
method init 18
method destroy 18

 

Spring IOC容器对bean的生命周期进行管理的过程

①  通过构造器或工厂方法创建bean实例

②  为bean的属性设置值和对其他bean的引用

③  将bean实例化并传递给postProcessBeforeinitialization方法

④  调用bean的初始化方法

⑤  将bean实例化并传递给postProcessAfterinitialization方法

⑥  使用bean

⑦  容器关闭，调用bean的销毁方法