Spring方法拦截器MethodInterceptor

方法拦截器使用SpringAop实现，其实现的底层也是动态代理，用法和动态代理非常相似。

package work.vcloud.voluntary;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.framework.ProxyFactory;


public class Student {

    public static void main(String[] args) {
        ProxyFactory proxyFactory = new ProxyFactory();
        proxyFactory.setTarget(new Student());
        proxyFactory.addAdvice(new adviseMethodInterceptor());
        Object proxy = proxyFactory.getProxy();
        Student methodInterceptor = (Student) proxy;
        methodInterceptor.add("张三");
    }

    
    public static class adviseMethodInterceptor implements MethodInterceptor {
        @Override
        public Object invoke(MethodInvocation methodInvocation) throws Throwable {
            Object result = null;
            try {
                Object[] arguments = methodInvocation.getArguments();
                for (int i = 0; i < arguments.length; i++) {
                    System.out.println("方法的参数：" + arguments[i]);
                }

                System.out.println("拦截的对象：" + methodInvocation.getThis());
                System.out.println("拦截的方法：" + methodInvocation.getMethod());

                System.out.println("方法执行之前");
                result = methodInvocation.proceed();
                System.out.println("方法执行之后");
                System.out.println("方法正常运行结果：" + result);
                return result;
            } catch (Exception e) {
                System.out.println("方法出现异常:" + e);
                System.out.println("方法运行Exception结果：" + result);
                return result;
            }
        }
    }

    public String add(String name) {
        //int num = 1 / 0;
        System.out.println("添加学生：" + name);
        return "添加成功！";
    }
}