什么时候是一个spring beans destroy-method叫做？

Question

我在bean的"destroy-method"中放了一个sysout语句.当我运行示例代码时,sysout没有得到输出.这是否意味着破坏方法没有被调用？

测试类:

  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

您的示例不起作用,因为您没有关闭appcontext,您只是让程序终止.

调用close()上下文,你会看到被调用的bean destroy方法.

Answer 2

OP可能为时已晚,但如果有人还在寻找它......

close方法是in AbstractApplicationContext和not ApplicationContext,另一种方法是使用ctx.registerShutdownHook() instead of ctx.close()明显的原因,在运行Junits时你可能想要关闭上下文而不是在生产环境中,所以让Spring决定何时关闭它.

Answer 3

当且仅当 bean 是单例实例时，才会调用“destroy-method”

查看IOC容器的日志输出

信息：销毁org.springframework.beans.factory.support.DefaultListableBeanFactory@1a0ce4c 中的单例：定义 beans [book1]；工厂层次结构的根

Answer 4

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

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