CGLIB动态代理

1、说明

动态生成一个要代理类的子类，子类重写要代理的类的所有不是final的方法。为没有实现接口的类提供代理，是jdk动态代理很好的补充。应用场景，例如aop、hibernate。

2、简单实例

public class DogService {

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

DogService dogService = new DogService();
// cglib动态代理
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();

测试结果

before
wang
after