[Java] 详解设计模式在Spring中的应用(9种)

<beans>
  <bean id="singletonbean" class="com.itxxz.helloitxxz">
  <constructor-arg>
    <value>hello! 这是singletonbean!value>
  </constructor-arg>
  </ bean>
 
  <bean id="itxxzbean" class="com.itxxz.helloitxxz"
  singleton="false">
  <constructor-arg>
    <value>hello! 这是itxxzbean! value>
  </constructor-arg>
  </bean>
 
</beans>

import java.util.random;
public class staticfactorybean {
   public static integer createrandom() {
    return new integer(new random().nextint());
  }
}

<bean id="random"
class="example.chapter3.staticfactorybean"
factory-method="createrandom" //createrandom方法必须是static的,才能找到
scope="prototype"
/>

public static void main(string[] args) {
   //调用getbean()时,返回随机数.如果没有指定factory-method,会返回staticfactorybean的实例,即返回工厂bean的实例
   xmlbeanfactory factory = new xmlbeanfactory(new classpathresource("config.xml"));
   system.out.println("我是it学习者创建的实例:"+factory.getbean("random").tostring());
}

public interface advisoradapter {
boolean supportsadvice(advice advice);
   methodinterceptor getinterceptor(advisor advisor);
 
}

class methodbeforeadviceadapter implements advisoradapter, serializable {
 
   public boolean supportsadvice(advice advice) {
    return (advice instanceof methodbeforeadvice);
   }
 
   public methodinterceptor getinterceptor(advisor advisor) {
    methodbeforeadvice advice = (methodbeforeadvice) advisor.getadvice();
   return new methodbeforeadviceinterceptor(advice);
   }
}