在不改变目标方法基础上,对目标方法进行增强
    1.openfeign远程调用中其实就用到了远程调用

    1. /**
    2.      * JDK动态代理流程
    3.      * @param student
    4.      */
    5.     @Test
    6.     public void ProxyTest1(Student student){
    8.         StudentServiceImpl studentService=new StudentServiceImpl();
    10.         IStudentService iStudentService = (IStudentService) Proxy.newProxyInstance(this.getClass().getClassLoader(), studentService.getClass().getInterfaces(),
    11.                 new InvocationHandler() {
    12.                     @Override
    13.                     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    15.                         if (method.getName().equals("addStudent")) {
    16.                             long start = System.currentTimeMillis();
    17.                             System.out.println("方法执行开始 = " + start);
    18.                             Object invoke = method.invoke(studentService, args);
    19.                             System.out.println("目标方法执行结束 = " + (System.currentTimeMillis() - start));
    20.                             //返回方法执行
    21.                             return invoke;
    22.                         }
    23.                         //其他方法不做代理增强,只对新增方法代理增强
    26.                         return method.invoke(studentService, args);
    27.                     }
    28.                 });
    29.             //执行代理方法
    30.             iStudentService.addStudent(student);
    32.     }