spring AOP注解失效原因分析及解决过程

//目标类接口
public interface JDKProxyTestService {
  void run();
}

//目标类
public class JDKProxyTestServiceImpl implements JDKProxyTestService {
  public void run(){
    System.out.println("do something...");
  }
}

//代理类
public class TestJDKProxy implements InvocationHandler {

  private Object targetObject; //代理目标对象

  //构造代理对象
  public Object newProxy(Object targetObject) {
    this.targetObject = targetObject;
    return Proxy.newProxyInstance(targetObject.getClass().getClassLoader(),
        targetObject.getClass().getInterfaces(), this);
  }

  //利用反射，在原逻辑上进行逻辑增强
  public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {
    //模拟事务开始
    assumeBeginTransaction();
    //原执行逻辑
    Object ret = method.invoke(targetObject, args);
    //模拟事务提交
    assumeCommitTransaction();
    return ret;
  }

  private void assumeBeginTransaction() {
    System.out.println("模拟事务开始...");
  }

  private void assumeCommitTransaction() {
    System.out.println("模拟事务提交...");
  }
}

//测试
public class Test { 
  public static void main(String[] args) {
    TestJDKProxy jdkProxy = new TestJDKProxy();
    JDKProxyTestService proxy = (JDKProxyTestService) jdkProxy.newProxy(new JDKProxyTestServiceImpl());
    proxy.run();
  }
}

// 在A方法内部调用B方法
// 1.直接调用B，注解失效。
B()
// 2.拿到代理类对象，再调用B。
((X)AopContext.currentProxy()).B()