Question

我是新手。我试图为不同的bean调用

调用init和destroy方法

我的init方法仅从“FileSystemResource”调用为什么不从其他人调用它？

public class DefaultMessage {
    private String message = "Basic Bean injecting";

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public DefaultMessage(String message) {
        this.message = message;
    }

    public DefaultMessage() {
    }
    public void init(){
        System.out.println("Testing init.");
    }
    public void destory(){
        System.out.println("Spring Container is destroyed.");
    }

我的XML是

<bean id="basicBean" class="com.sarma.spring.core.DefaultMessage" init-method="init" destroy-method="destory"></bean>

主要课程

//Type 1
ApplicationContext applicationContext =new ClassPathXmlApplicationContext("DefaultMessage.xml");

//Basic Bean Testing
DefaultMessage message = (DefaultMessage) applicationContext.getBean("basicBean");
log.info(message.getMessage());
log.info("---------------------------ApplicationContext End------------------------------");

//Type 2
Resource res = new FileSystemResource("C:\\Sarma\\Spring\\SpringEx\\src\\resource\\DefaultMessage.xml");
BeanFactory factory = new XmlBeanFactory(res);
DefaultMessage message1 = (DefaultMessage) factory.getBean("basicBean");
log.info("Test "+message1.getMessage());
log.info("- ---------------------------FileSystemResource End------------------------------");  

//Type 3
ClassPathResource res1 = new ClassPathResource("DefaultMessage.xml");
BeanFactory factory1 = new XmlBeanFactory(res1);
DefaultMessage message2 = (DefaultMessage) factory1.getBean("basicBean");
log.info("Test "+message2.getMessage());
log.info("- ---------------------------ClassPathResource End-------------------------------");

//Type4
ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"DefaultMessage.xml"});
DefaultMessage message3 = (DefaultMessage) context.getBean("basicBean");
log.info(message3.getMessage());
context.close();
log.info("- ---------------------------ConfigurableApplicationContext End------------------");

输出

2013-09-18 13:49:22 INFO  ClassPathXmlApplicationContext:513 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@913750: startup date [Wed Sep 18 13:49:22 EDT 2013]; root of context hierarchy
2013-09-18 13:49:22 INFO  XmlBeanDefinitionReader:316 - Loading XML bean definitions from class path resource [DefaultMessage.xml]
2013-09-18 13:49:22 INFO  DefaultMessageMain:27 - Basic Bean injecting
2013-09-18 13:49:22 INFO  DefaultMessageMain:29 - ---------------------------ApplicationContext End------------------------------
2013-09-18 13:49:22 INFO  XmlBeanDefinitionReader:316 - Loading XML bean definitions from file [C:\Sarma\Spring\SpringEx\src\resource\DefaultMessage.xml]
Testing init.
2013-09-18 13:49:22 INFO  DefaultMessageMain:36 - Test Basic Bean injecting
2013-09-18 13:49:22 INFO  DefaultMessageMain:37 - - ---------------------------FileSystemResource End------------------------------
2013-09-18 13:49:22 INFO  XmlBeanDefinitionReader:316 - Loading XML bean definitions from class path resource [DefaultMessage.xml]
2013-09-18 13:49:22 INFO  DefaultMessageMain:42 - Test Basic Bean injecting
2013-09-18 13:49:22 INFO  DefaultMessageMain:43 - - ---------------------------ClassPathResource End-------------------------------
2013-09-18 13:49:22 INFO  ClassPathXmlApplicationContext:513 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@176e552: startup date [Wed Sep 18 13:49:22 EDT 2013]; root of context hierarchy
2013-09-18 13:49:22 INFO  XmlBeanDefinitionReader:316 - Loading XML bean definitions from class path resource [DefaultMessage.xml]
2013-09-18 13:49:22 INFO  DefaultMessageMain:47 - Basic Bean injecting
2013-09-18 13:49:22 INFO  ClassPathXmlApplicationContext:873 - Closing org.springframework.context.support.ClassPathXmlApplicationContext@176e552: startup date [Wed Sep 18 13:49:22 EDT 2013]; root of context hierarchy
2013-09-18 13:49:22 INFO  DefaultMessageMain:49 - - ---------------------------ConfigurableApplicationContext End------------------

我的init方法仅从“FileSystemResource”调用为什么不从其他人调用它？

为什么表现不同？

它从未调用过我的破坏方法

Answer 1

我要复制你的代码来解释

//Type 1
ApplicationContext applicationContext =new ClassPathXmlApplicationContext("DefaultMessage.xml");

//Basic Bean Testing
DefaultMessage message = (DefaultMessage) applicationContext.getBean("basicBean");

以上将init()你的bean。

//Type 2
Resource res = new FileSystemResource("C:\\Sarma\\Spring\\SpringEx\\src\\resource\\DefaultMessage.xml");
BeanFactory factory = new XmlBeanFactory(res);
DefaultMessage message1 = (DefaultMessage) factory.getBean("basicBean");

这也是init()你的bean。

//Type 3
ClassPathResource res1 = new ClassPathResource("DefaultMessage.xml");
BeanFactory factory1 = new XmlBeanFactory(res1);
DefaultMessage message2 = (DefaultMessage) factory1.getBean("basicBean");

这也是init()你的bean。

//Type4
ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"DefaultMessage.xml"});
DefaultMessage message3 = (DefaultMessage) context.getBean("basicBean");
log.info(message3.getMessage());
context.close();

这也将init()你的bean。由于context.close()，所有bean将在关闭上下文之前被销毁。如果没有调用destroy-method，你可以尝试使用DisposableBean接口，但考虑到这种不好的做法，因为你的类开始依赖于Spring类型。

Answer 2

我已经为我的bean类实现了DisposableBean接口，并覆盖了destroy方法，并从我的XML中删除了destroy-method方法。

现在destroy方法调用3次，除了ApplicationContext， Destroy方法是从FileSystemResource，ClassPathResource，ClassPathXmlApplicationContext调用而不是从ApplicationContext调用。

Answer 3

对于ClassPathXmlApplicationContext，我们可以传递不同的xml，例如

ConfigurableApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"DefaultMessage.xml", "DefaultMessage1.xml}");

关闭ConfigurableApplicationContext时，它将关闭所有打开的资源，这就是它关闭所有3个FileSystemResource，ClassPathResource，ClassPathXmlApplicationContext的原因。

为什么spring init-method destroy-method方法表现不同？

3 个答案: