Spring 之常用接口

zhangwei_david

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Spring

1.ApplicationContextAware

任何期望在ApplicationContext运行的时候被通知到都可以实现该接口

/**
 * 测试Spring ApplicationContextAware接口
 * @author zhangwei_david
 * @version $Id: TestApplicationContextAware.java, v 0.1 2015年1月3日 上午11:42:19 zhangwei_david Exp $
 */
@Component
public class TestApplicationContextAware implements ApplicationContextAware {

    /**
     * @see org.springframework.context.ApplicationContextAware#setApplicationContext(org.springframework.context.ApplicationContext)
     */
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        LoggerUtils.info("ApplicationContext runs in");
    }

}

启动过程的日志如下：

一月 03, 2015 11:46:02 上午 org.springframework.context.support.AbstractApplicationContext$BeanPostProcessorChecker postProcessAfterInitialization
信息: Bean 'executor' of type [class org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
一月 03, 2015 11:46:02 上午 org.springframework.scheduling.concurrent.ExecutorConfigurationSupport initialize
信息: Initializing ExecutorService  'scheduler'
一月 03, 2015 11:46:02 上午 org.springframework.context.support.AbstractApplicationContext$BeanPostProcessorChecker postProcessAfterInitialization
信息: Bean 'scheduler' of type [class org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
一月 03, 2015 11:46:02 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@132c619: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,app,asyncDemo,testClient,testApplicationContextAware,executor,scheduler,org.springframework.context.annotation.internalAsyncAnnotationProcessor,org.springframework.context.annotation.internalScheduledAnnotationProcessor,studentBiz,beforeAdvice,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,afterAdvice,helloWord,fileCopier,mbeanExporter,assembler,messageSource,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
11:46:02.886 [main] INFO  com.cathy.demo.util.LoggerUtils - ApplicationContext runs in
一月 03, 2015 11:46:02 上午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.apache.cxf.bus.spring.BusApplicationContext@121202d: startup date [Sat Jan 03 11:46:02 CST 2015]; root of context hierarchy
一月 03, 2015 11:46:03 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [META-INF/cxf/cxf.xml]
一月 03, 2015 11:46:03 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [META-INF/cxf/cxf-extension-jaxws.xml]
一月 03, 2015 11:46:03 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [META-INF/cxf/cxf-extension-soap.xml]
一月 03, 2015 11:46:03 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

2 BeanNameAware

如果Bean想知道在BeanFactory中设置的名字时可以实现该接口

/**
 * 测试BeanNameAware接口
 * @author zhangwei_david
 * @version $Id: TestBeanNameAware.java, v 0.1 2015年1月3日 上午11:48:50 zhangwei_david Exp $
 */
@Component(value = "hello")
public class TestBeanNameAware implements BeanNameAware {

    private String beanName;

    /**
     * @see org.springframework.beans.factory.BeanNameAware#setBeanName(java.lang.String)
     */
    public void setBeanName(String name) {
        LoggerUtils.info("setBeanName(" + name + ")");
        beanName = name;
    }

    /**
     * Getter method for property <tt>beanName</tt>.
     *
     * @return property value of beanName
     */
    public String getBeanName() {
        return beanName;
    }

}

结果是：

12:10:47.496 [main] INFO com.cathy.demo.util.LoggerUtils - setBeanName(hello)

3. InitializingBean

如果期望在BeanFactory 设置所有的属性后作出进一步的反应可以实现该接口

/**
 * 测试InitializingBean
 * @author zhangwei_david
 * @version $Id: TestInitializingBean.java, v 0.1 2015年1月3日 下午12:04:38 zhangwei_david Exp $
 */
@Component()
public class TestInitializingBean implements InitializingBean, BeanNameAware {

    private String beanName;

    /**
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        LoggerUtils.info("Bean的属性都被设置完成:" + beanName);
    }

    /**
     * @see org.springframework.beans.factory.BeanNameAware#setBeanName(java.lang.String)
     */
    public void setBeanName(String name) {
        beanName = name;
    }

}

结果是：

12:10:47.496 [main] INFO com.cathy.demo.util.LoggerUtils - Bean的属性都被设置完成:testInitializingBean

在Spring中有两种方式在Bean的全部属性都设置成功后执行特定的行为，除了实现InitializingBean接口外还可以在Spring的配置文件中指定init-method属性。那么如果这两者同时存在执行的属性又该是什么样的呢？

/**
 *  测试InitializingBean接口的特点
 *
 * @author zhangwei_david
 * @version $Id: MyInitTest.java, v 0.1 2015年6月7日 下午5:46:27 zhangwei_david Exp $
 */

public class MyInitTest implements InitializingBean {

    public MyInitTest() {
        System.out.println("------------MyInitTest 构造方法被调用-------------");
    }

    public void init() {
        System.out.println("------------spring 配置的initMethod 被调用-------------");
    }

    /**
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        System.out.println("------------InitializingBean.afterPropertiesSet ()方法被调用-------------");
    }

}

<bean id="myInitTest" class="com.cathy.demo.spring.MyInitTest"
		init-method="init" />

log4j:WARN custom level class [# 输出DEBUG级别以上的日志] not found.
2015-06-07 17:56:47  [ main:0 ] - [ INFO ]  @TestExecutionListeners is not present for class [class com.cathy.demo.spring.MySpringTest]: using defaults.
2015-06-07 17:56:47  [ main:145 ] - [ INFO ]  Loading XML bean definitions from URL [file:/H:/Alipay.com/workspace4alipay/demo/target/classes/META-INF/spring/test-beans.xml]
2015-06-07 17:56:47  [ main:327 ] - [ INFO ]  JSR-250 'javax.annotation.ManagedBean' found and supported for component scanning
2015-06-07 17:56:47  [ main:359 ] - [ INFO ]  Refreshing org.springframework.context.support.GenericApplicationContext@15f7ae5: startup date [Sun Jun 07 17:56:47 CST 2015]; root of context hierarchy
2015-06-07 17:56:47  [ main:472 ] - [ INFO ]  Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2db087: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
------------MyInitTest 构造方法被调用-------------
------------InitializingBean.afterPropertiesSet ()方法被调用-------------
------------spring 配置的initMethod 被调用-------------
2015-06-07 17:56:47  [ Thread-0:493 ] - [ INFO ]  Closing org.springframework.context.support.GenericApplicationContext@15f7ae5: startup date [Sun Jun 07 17:56:47 CST 2015]; root of context hierarchy
2015-06-07 17:56:47  [ Thread-0:494 ] - [ INFO ]  Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2db087: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy

我们从日志可以可以发现，它们的执行顺序是， afterPropertiesSet()->initMethod()

在使用注解的方式指定initMehthod的方式是在initMethod（）上添加 @PostConstruct 此时的执行顺序是否还是这样呢？我们看看下面的测试，Spring的配置文件中不在有bean的配置

/**
 *  测试InitializingBean接口的特点
 *
 * @author zhangwei_david
 * @version $Id: MyInitTest.java, v 0.1 2015年6月7日 下午5:46:27 zhangwei_david Exp $
 */
@Component
public class MyInitTest implements InitializingBean {

    public MyInitTest() {
        System.out.println("------------MyInitTest 构造方法被调用-------------");
    }

    @PostConstruct
    public void init() {
        System.out.println("------------spring 配置的initMethod 被调用-------------");
    }

    /**
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        System.out.println("------------InitializingBean.afterPropertiesSet ()方法被调用-------------");
    }

}

结果是：

2015-06-07 18:09:44  [ main:0 ] - [ INFO ]  @TestExecutionListeners is not present for class [class com.cathy.demo.spring.MySpringTest]: using defaults.
2015-06-07 18:09:44  [ main:136 ] - [ INFO ]  Loading XML bean definitions from URL [file:/H:/Alipay.com/workspace4alipay/demo/target/classes/META-INF/spring/test-beans.xml]
2015-06-07 18:09:44  [ main:311 ] - [ INFO ]  JSR-250 'javax.annotation.ManagedBean' found and supported for component scanning
2015-06-07 18:09:44  [ main:346 ] - [ INFO ]  Refreshing org.springframework.context.support.GenericApplicationContext@15f7ae5: startup date [Sun Jun 07 18:09:44 CST 2015]; root of context hierarchy
2015-06-07 18:09:44  [ main:480 ] - [ INFO ]  Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1fe3806: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
------------MyInitTest 构造方法被调用-------------
------------spring 配置的initMethod 被调用-------------
------------InitializingBean.afterPropertiesSet ()方法被调用-------------
2015-06-07 18:09:44  [ Thread-0:500 ] - [ INFO ]  Closing org.springframework.context.support.GenericApplicationContext@15f7ae5: startup date [Sun Jun 07 18:09:44 CST 2015]; root of context hierarchy
2015-06-07 18:09:44  [ Thread-0:501 ] - [ INFO ]  Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1fe3806: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy

4. BeanPostProcessor

BeanPostProcessor 是BeanFactory的钩子允许客户对新建的Bean进行修改

/**
 * Test BeanPostProcessor
 * @author zhangwei_david
 * @version $Id: TestBeanPostProcessor.java, v 0.1 2015年1月3日 下午12:14:32 zhangwei_david Exp $
 */
@Component
public class TestBeanPostProcessor implements BeanPostProcessor {

    /**
     * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization(java.lang.Object, java.lang.String)
     */
    public Object postProcessBeforeInitialization(Object bean, String beanName)
                                                                               throws BeansException {
        LoggerUtils.info("bean初始化之前调用：bean=" + bean + ", beanName" + beanName);
        return bean;
    }

    /**
     * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object, java.lang.String)
     */
    public Object postProcessAfterInitialization(Object bean, String beanName)
                                                                              throws BeansException {
        LoggerUtils.info("bean初始化之后调用：bean=" + bean + ", beanName" + beanName);
        return bean;
    }

}

结果是：

12:16:06.314 [main] INFO com.cathy.demo.util.LoggerUtils - ApplicationContext runs in
12:16:06.314 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之前调用：bean=com.cathy.demo.test.TestApplicationContextAware@f70944, beanNametestApplicationContextAware
after test for AOP   postProcessBeforeInitialization
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之后调用：bean=com.cathy.demo.test.TestApplicationContextAware@f70944, beanNametestApplicationContextAware
after test for AOP   postProcessAfterInitialization
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - setBeanName(hello)
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之前调用：bean=com.cathy.demo.test.TestBeanNameAware@a6bea6, beanNamehello
after test for AOP   postProcessBeforeInitialization
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之后调用：bean=com.cathy.demo.test.TestBeanNameAware@a6bea6, beanNamehello
after test for AOP   postProcessAfterInitialization
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之前调用：bean=com.cathy.demo.test.TestInitializingBean@1b21bd3, beanNametestInitializingBean
after test for AOP   postProcessBeforeInitialization
12:16:06.330 [main] INFO com.cathy.demo.util.LoggerUtils - Bean的属性都被设置完成:testInitializingBean
12:16:06.346 [main] INFO com.cathy.demo.util.LoggerUtils - bean初始化之后调用：bean=com.cathy.demo.test.TestInitializingBean@1b21bd3, beanNametestInitializingBean
after test for AOP   postProcessAfterInitialization

/**
 *  测试InitializingBean接口的特点
 *  测试BeanPostProcessor接口
 *
 * @author zhangwei_david
 * @version $Id: MyInitTest.java, v 0.1 2015年6月7日 下午5:46:27 zhangwei_david Exp $
 */
@Component
public class MyInitTest implements InitializingBean, BeanPostProcessor {

    private Person man;

    public MyInitTest() {
        System.out.println("------------MyInitTest 构造方法被调用-------------");
    }

    @PostConstruct
    public void init() {
        System.out.println("------------spring 配置的initMethod 被调用-------------");
    }

    /**
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        System.out.println("------------InitializingBean.afterPropertiesSet ()方法被调用-------------");
    }

    /**
     * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization(java.lang.Object, java.lang.String)
     */
    public Object postProcessBeforeInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("---------在" + beanName
                           + "初始化之前调用 postProccessBeforeInitializaiton--------");
        return bean;
    }

    /**
     * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object, java.lang.String)
     */
    public Object postProcessAfterInitialization(Object bean, String beanName)
            throws BeansException {
        System.out.println("---------在" + beanName
                           + "初始化之后 调用 postProcessAfterInitialization--------");
        return bean;
    }

    /**
     * Setter method for property <tt>man</tt>.
     *
     * @param man value to be assigned to property man
     */
    @Autowired
    public void setMan(Person man) {
        System.out.println(" 设置属性 man=" + man.getSex());
        this.man = man;
    }

}

------------MyInitTest 构造方法被调用-------------
2015-06-07 18:49:55  [ main:480 ] - [ INFO ]  Bean 'man' of type [class com.cathy.demo.spring.Man] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
 设置属性 man=Male
------------spring 配置的initMethod 被调用-------------
------------InitializingBean.afterPropertiesSet ()方法被调用-------------
2015-06-07 18:49:55  [ main:492 ] - [ INFO ]  Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@de0926: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,man,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
---------在com.cathy.demo.spring.MySpringTest初始化之前调用 postProccessBeforeInitializaiton--------
---------在com.cathy.demo.spring.MySpringTest初始化之后 调用 postProcessAfterInitialization--------
2015-06-07 18:49:55  [ Thread-0:506 ] - [ INFO ]  Closing org.springframework.context.support.GenericApplicationContext@115b42e: startup date [Sun Jun 07 18:49:55 CST 2015]; root of context hierarchy
2015-06-07 18:49:55  [ Thread-0:507 ] - [ INFO ]  Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@de0926: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,myInitTest,man,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy

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