Spring容器初始化及問(wèn)題解決方案
1.Spring bean組件 ”默認(rèn)為單例模式scope=“singleton, 運(yùn)行JavaApplication容器啟動(dòng)時(shí)自動(dòng)創(chuàng)建對(duì)象
scope=“prototype”為多例模式,請(qǐng)求條件下才創(chuàng)建對(duì)象
2beans組件 里面default-init-method初始化方法加載,范圍比較大,當(dāng)沒有此方法時(shí)不會(huì)報(bào)錯(cuò),default-destroy-method銷毀方法,default-lazy-init=“true/false” 對(duì)象延時(shí)實(shí)例化
3.bean組件里面init-method初始化無(wú)此方法,會(huì)報(bào)錯(cuò), destroy-method銷毀方法,lazy-init=“true/false” 延時(shí)實(shí)例化
注意:
1.銷毀方法對(duì)scope=“prototype”多例模式無(wú)效
2.AbstractApplicationContext可以關(guān)閉容器,可以調(diào)用close()方法,關(guān)閉容器,調(diào)用銷毀方法
3.對(duì)象延時(shí)實(shí)例化對(duì)多例模式?jīng)]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(rèn)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(guò)構(gòu)造完成初始bean屬性,可以通過(guò)初始化完成
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