Spring 框架的 MethodInterceptor 简介及示例代码

import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;
import java.lang.reflect.Method;
public class MyMethodInterceptor implements MethodInterceptor {
    @Override
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        // 在方法调用前执行的代码
        System.out.println("Before method execution");
        // 调用被代理的方法
        Object result = proxy.invokeSuper(obj, args);
        // 在方法调用后执行的代码
        System.out.println("After method execution");
        return result;
    }
}

import org.springframework.cglib.proxy.Enhancer;
public class Main {
    public static void main(String[] args) {
        // 创建目标对象
        MyService myService = new MyService();
        // 创建CGLIB Enhancer
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(MyService.class);
        enhancer.setCallback(new MyMethodInterceptor());
        // 创建代理对象
        MyService proxy = (MyService) enhancer.create();
        // 调用代理对象的方法
        proxy.doSomething();
    }
}