Cglib dynamic proxy

1、 explain

Dynamically generate a subclass of the proxy class , Subclass overrides all of the classes to be proxied final Methods . Provide proxies for classes that do not implement interfaces , yes jdk Dynamic agent is a good supplement . Application scenarios , for example aop、hibernate.

2、 Simple example

public class DogService {

	public void sound() {
		System.out.println("wang");
	}
	
}

DogService dogService = new DogService();
// cglib A dynamic proxy 
Enhancer enhancer = new Enhancer();
enhancer.setClassLoader(dogService.getClass().getClassLoader());
enhancer.setSuperclass(dogService.getClass());
MethodInterceptor methodInterceptor = new MethodInterceptor() {
	
	@Override
	public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy)
			throws Throwable {
		System.out.println("before");
        Object invoke = method.invoke(dogService, args);
        System.out.println("after");
        return invoke;
	}
	
};
enhancer.setCallback(methodInterceptor);
DogService dogServiceProxy = (DogService) enhancer.create();
dogServiceProxy.sound();

test result

before
wang
after