2018-1 Spring AOP - 2_org.aopallicance找不到-优快云博客

本文详细介绍了 Spring AOP 的五种增强机制，包括前置、后置、环绕、异常及引介增强，并通过具体示例展示了如何实现前置增强。

Sping增强

包含：

1. 前置增强： org.springframework.aop.BeforeAdvice

2. 后置增强: org.springframework.aop.AfterReturningAdvice

3.环绕增强: org.aopallicance.intercept.MethodInterceptor, 在方法前后执行

4. 异常抛出增强： org.springframework.aop.ThrowsAdvice

5. 引介增强: org.springframework.aop.IntrodutionInterceptor

BeforeAdvice example

The NaiveWaiter as the target class

public class NaiveWaiter implements Waiter{
public void greetTo(String name){
 System.out.println("greet to"+name);
}
public void serveTo(String name){
 System.out.println("serving"+name);
}
}

The Advice

public class GreetingBeforeAdvice implements MethodBeforeAdvice{
    public void before(Method method, Object[] args, Object o) throws Throwable{
  String clientName = (String)args[0];
  System.out.println("how are you! " + clientName);
 }
}

using

import org.springframework,aop.framework.ProxyFactory;

public class TestBeforeAdvice{
 public static void main(String[] args){
  Waiter target = new NaiveWaiter();
  BeforeAdvice advice = new GreetingBeforeAdvice();

  ProxyFactory pf = new ProxyFactory();
  pf.setTarget(target);
  pf.addAdvice(advice);

  Waiter proxy = (Waiter)pf.getProxy();
  proxy.greeTo("John");
  proxy.serveTo("Tom");
 }


}

<bean id="greetingAdvice" class="GreetingBeforeAdvice"/>
<bean id="target" class="NaiveWaiter"/>
<bean id="waiter" class ="org.springframework.aop.framework.ProxyFactoryBean"
p:proxyInterfaces="Waiter"
p:interceptorNames="greetingAdvice"
p:target-ref="target"/>