AOP 学习, ProxyFactory 学习一

Advice: 拦截的切面

ProxyFactory: 简单使用

使用ProxyFactory, 需要指定其两个属性

       setTarget: 拦截目标
       addAdvice: 切面， 也就是拦截目标时你要执行的动作

public class MessageWriter {
	
	public void showMessage(){
		
		System.out.println("this is a test");
		
	}

}

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class MessageDecorator implements MethodInterceptor{
	
	public Object invoke(MethodInvocation invocation) throws Throwable{
		System.out.print("hello\n");
		Object retVal=invocation.proceed();
		System.out.print("end");
		return retVal;
	}

}

import org.springframework.aop.framework.ProxyFactory;


public class test {

	public static void main(String[] args) {
		
		MessageWriter target =new MessageWriter();
		
		ProxyFactory pf=new ProxyFactory(target);
		
		/* or 
		 ProxyFactory pf=new ProxyFactory(); 
		 ps.setTarget(target);
		 */
		pf.addAdvice(new MessageDecorator()); 
		
		MessageWriter proxy=(MessageWriter)pf.getProxy();
		
		proxy.showMessage();
		
	}
}

result:

hello
this is a test
end