Spring中的InitializingBean接口的使用

import org.springframework.beans.factory.InitializingBean;
public class TestInitializingBean implements InitializingBean{
  @Override
  public void afterPropertiesSet() throws Exception {
    System.out.println("ceshi InitializingBean");    
  }
  public void testInit(){
    System.out.println("ceshi init-method");    
  }
}

<bean id="testInitializingBean" class="com.TestInitializingBean" ></bean>

public class Main {
  public static void main(String[] args){
    ApplicationContext context = new FileSystemXmlApplicationContext("/src/main/java/com/beans.xml");
  }
}

<bean id="testInitializingBean" class="com.TestInitializingBean" init-method="testInit"></bean>

protected void invokeInitMethods(String beanName, final Object bean, RootBeanDefinition mbd) throws Throwable {
  //判断该bean是否实现了实现了InitializingBean接口，如果实现了InitializingBean接口，则只掉调用bean的afterPropertiesSet方法
  boolean isInitializingBean = (bean instanceof InitializingBean);
  if (isInitializingBean && (mbd == null || !mbd.isExternallyManagedInitMethod("afterPropertiesSet"))) {
    if (logger.isDebugEnabled()) {
      logger.debug("Invoking afterPropertiesSet() on bean with name '" + beanName + "'");
    }
     
    if (System.getSecurityManager() != null) {
      try {
        AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
          public Object run() throws Exception {
            //直接调用afterPropertiesSet
            ((InitializingBean) bean).afterPropertiesSet();
            return null;
          }
        },getAccessControlContext());
      } catch (PrivilegedActionException pae) {
        throw pae.getException();
      }
    }        
    else {
      //直接调用afterPropertiesSet
      ((InitializingBean) bean).afterPropertiesSet();
    }
  }
  if (mbd != null) {
    String initMethodName = mbd.getInitMethodName();
    //判断是否指定了init-method方法，如果指定了init-method方法，则再调用制定的init-method
    if (initMethodName != null && !(isInitializingBean && "afterPropertiesSet".equals(initMethodName)) &&
        !mbd.isExternallyManagedInitMethod(initMethodName)) {
      //进一步查看该方法的源码，可以发现init-method方法中指定的方法是通过反射实现
      invokeCustomInitMethod(beanName, bean, mbd);
    }
  }
}