spring aop，静态及动态代理例子

@Aspect
@Component
public class AopText {

    @Pointcut("execution(public * com.llf.service.*Service.*(..))")
    public void leanPoint(){
    }

    @Before("leanPoint()")
    public void before(){
        System.out.print("前置...");
    }

    @After("leanPoint()")
    public void after(){
        System.out.print("后置..");
    }

}

静态代理实现：接口实现

public interface JingtaiService {

    public void save();
    public void del();
}

public class JingtaiServiceImpl implements JingtaiService {
    @Override
    public void save() {
        System.out.print("保存数据");
    }

    @Override
    public void del() {
        System.out.print("删除数据");
    }
}

public class JingtaiProxy implements JingtaiService {

    @Autowired
    private JingtaiService target;

    public JingtaiProxy(JingtaiService target){
        this.target = target;
    }

    @Override
    public void save() {
        System.out.print("开始事物");
        target.save();
        System.out.print("结束事物");
    }

 @Override
    public void del() {
        System.out.print("开始事物");
        target.del();
        System.out.print("结束事物");
    }

}

测试：
    public static void main(String[] args) {
        JingtaiService jm = new JingtaiServiceImpl();
        JingtaiProxy jp = new JingtaiProxy(jm);
        jp.save(); 
}

动态代理：不需要接口实现，jdk方式实现

public class DongtaiProxy {

    private Object target;
    public DongtaiProxy(Object target) {
        this.target = target;
    }
    //ClassLoader loader,:指定当前目标对象使用类加载器,获取加载器的方法是固定的
    //Class<?>[] interfaces,:目标对象实现的接口的类型,使用泛型方式确认类型
    //InvocationHandler h:事件处理,执行目标对象的方法时,会触发事件处理器的方法,会把当前执行目标对象的方法作为参数传入
    public Object getProxy(){
        return Proxy.newProxyInstance(
                target.getClass().getClassLoader(),
                target.getClass().getInterfaces(),
                new InvocationHandler() {
                    @Override
                    public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
                       System.out.print("开始动态事物");
                       Object returnvalue = method.invoke(target,objects);
                       System.out.print("提交事物");
                        return returnvalue;
                    }
                }
        );

    }

}

测试：

 public static void main(String[] args) {
        JingtaiService jm = new JingtaiServiceImpl();
        JingtaiService js = (JingtaiService)new DongtaiProxy(jm).getProxy();
        js.save();
        js.del();
    }