什麼時候是一個叫做spring bean的destroy-method？

Question

我已經在一個bean的「destroy-method」中放了一個sysout語句。當我運行一個示例代碼時，sysout沒有得到輸出。這是否意味着銷燬方法沒有被調用？

測試類：

package spring.test; 

    import org.springframework.context.ApplicationContext; 
    import org.springframework.context.support.ClassPathXmlApplicationContext; 

    public class InitTest { 
    public static void main(String[] args) { 
     ApplicationContext ctx = new ClassPathXmlApplicationContext("InitTestContext.xml"); 
     InitTestBean bean = (InitTestBean)ctx.getBean("InitTestBean"); 
     bean.display(); 
    } 
    } 

豆

package spring.test; 

    public class InitTestBean { 
    private String prop1; 
    private String prop2; 

    public InitTestBean(String prop1, String prop2) { 
     System.out.println("Instantiating InitTestBean"); 
     this.prop1 = prop1; 
     this.prop2 = prop2; 
    } 

    public void setProp1(String prop1) { 
     System.out.println("In setProp1"); 
     this.prop1 = prop1; 
    } 

    public void setProp2(String prop2) { 
     System.out.println("In setProp2"); 
     this.prop2 = prop2; 
    } 

    public String getProp1() { 
     return prop1; 
    } 

    public String getProp2() { 
     return prop2; 
    } 

    public void display() { 
     System.out.println("Prop1 is " + prop1); 
     System.out.println("Prop2 is " + prop2); 
    } 

    public void initialize(){ 
     System.out.println("In initialize"); 
     this.prop1 = "init-prop1"; 
     this.prop2 = "init-prop2"; 
    } 

    public void teardown() { 
     System.out.println("In teardown"); 
     this.prop1 = null; 
     this.prop2 = null; 
    } 
    } 

配置文件：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 

    <bean id="InitTestBean" class="spring.test.InitTestBean" init-method="initialize" destroy-method="teardown"> 
     <constructor-arg value="Prop1" /> 
     <constructor-arg value="Prop2" /> 
     <property name="prop1" value="setProp1"/> 
     <property name="prop2" value="setProp2"/> 
    </bean> 

</beans> 

Answer 1

您的例子不工作，因爲你沒有關閉appcontext ，你只是讓程序終止。

在上下文中調用close()，您將看到bean被調用的方法。

Answer 2

這可能是太晚了OP，但如果有人仍然在尋找它...

close方法是AbstractApplicationContext而不是ApplicationContext，也是另一種方法是使用ctx.registerShutdownHook()instead of ctx.close()出於顯而易見的原因，在運行Junit時，您可能想要關閉上下文，但不能在生產環境中關閉，因此讓Spring決定何時關閉它。

Answer 3

//Getting application context 
ApplicationContext context = new ClassPathXmlApplicationContext(beansXML); 

//cleaning context 
((ClassPathXmlApplicationContext) context).close(); 

Answer 4

喜你需要改變ApplicationContext到AbstractApplicationContext，然後註冊一個ShutDownhook這會破壞你的bean，也實現了DisposableBean接口，例如：

package spring.test; 

    import org.springframework.context.ApplicationContext; 
    import org.springframework.context.support.ClassPathXmlApplicationContext; 
    import org.springframework.context.support.AbstractApplicationContext; 
    public class InitTest { 
    public static void main(String[] args) { 
     AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("InitTestContext.xml"); 
    ctx.registerShutdownHook(); 
     InitTestBean bean = (InitTestBean)ctx.getBean("InitTestBean"); 
     bean.display(); 
    } 
    } 

現在implemnt DisposableBean接口也

package spring.test; 
import org.springframework.beans.factory.DisposableBean; 
    public class InitTestBean implements DisposableBean{ 
    private String prop1; 
    private String prop2; 
    public InitTestBean(String prop1, String prop2) { 
     System.out.println("Instantiating InitTestBean"); 
     this.prop1 = prop1; 
     this.prop2 = prop2; 
    } 
    public void setProp1(String prop1) { 
     System.out.println("In setProp1"); 
     this.prop1 = prop1; 
    } 
    public void setProp2(String prop2) { 
     System.out.println("In setProp2"); 
     this.prop2 = prop2; 
    } 
    public String getProp1() { 
     return prop1; 
    } 
    public String getProp2() { 
     return prop2; 
    } 
    public void display() { 
     System.out.println("Prop1 is " + prop1); 
     System.out.println("Prop2 is " + prop2); 
    } 
    public void initialize(){ 
     System.out.println("In initialize"); 
     this.prop1 = "init-prop1"; 
     this.prop2 = "init-prop2"; 
    } 
    public void teardown() { 
     System.out.println("In teardown"); 
     this.prop1 = null; 
     this.prop2 = null; 
    } 
    @Override 
    public void destroy() throws Exception { 

     System.out.println(" the bean has been destroyed"); 
    } 
    } 

Answer 5

factory.destroySingletons();之後bean.display() as destroy-method is v包含在bean的定義中。創建bean的默認範圍是singleton，因此調用factory.destroySingletons()將調用destroy-method中提到的方法。

Answer 6

的「滅法」只叫當且僅當豆是單一實例

見IOC容器

信息的日誌輸出：銷燬單身在org.springframework。 beans.factory.support.DefaultListableBeanFactory@1a0ce4c：定義beans [book1];工廠層級根