1.Spring bean組件 ”默認為單例模式scope=“singleton， 運行JavaApplication容器啟動時自動創(chuàng)建對象

scope=“prototype”為多例模式，請求條件下才創(chuàng)建對象

2beans組件 里面default-init-method初始化方法加載，范圍比較大，當沒有此方法時不會報錯,default-destroy-method銷毀方法，default-lazy-init=“true/false” 對象延時實例化

3.bean組件里面init-method初始化無此方法，會報錯， destroy-method銷毀方法，lazy-init=“true/false” 延時實例化

注意：

1.銷毀方法對scope=“prototype”多例模式無效

2.AbstractApplicationContext可以關閉容器，可以調用close()方法，關閉容器，調用銷毀方法

3.對象延時實例化對多例模式沒有意義。

XML

<?xml version='1.0' encoding='UTF-8'?><beans xmlns='http://www.springframework.org/schema/beans' xmlns:context='http://www.springframework.org/schema/context' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:aop='http://www.springframework.org/schema/aop' xmlns:tx='http://www.springframework.org/schema/tx' xmlns:p='http://www.springframework.org/schema/p' xmlns:util='http://www.springframework.org/schema/util' xmlns:jdbc='http://www.springframework.org/schema/jdbc' xmlns:cache='http://www.springframework.org/schema/cache' xsi:schemaLocation=' http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd' default-init-method='initEmp' default-destroy-method='destroyEmp' default-lazy-init='true'> <bean init-method='initEmp' destroy-method='destroyEmp' lazy-init='false' scope='singleton' ></bean> </beans>

Test方法

//bean組件的默認方式 @Test public void beanInitTest() { AbstractApplicationContext appContext=new ClassPathXmlApplicationContext('com/tracy/xml/bean-init-destroy.xml'); ApplicationContext app=new ClassPathXmlApplicationContext('com/tracy/xml/bean-init-destroy.xml'); Emp emp=app.getBean('emp',Emp.class); System.out.print(emp); appContext.close(); }

通過構造完成初始bean屬性，可以通過初始化完成

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