#### 原理 ``` 利用asm开源包，对代理对象类的class文件加载进来，通过修改其字节码生成子类来处理 ``` ~~~ public class CglibProxy implements MethodInterceptor { private Object targetObject; // 这里的目标类型为Object，则可以接受任意一种参数作为被代理类，实现了动态代理 public Object getInstance(Object target) { // 设置需要创建子类的类 this.targetObject = target; Enhancer enhancer = new Enhancer(); enhancer.setSuperclass(target.getClass()); enhancer.setCallback(this); return enhancer.create(); } public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable { System.out.println("开启事物"); Object result = proxy.invoke(targetObject, args); System.out.println("关闭事物"); // 返回代理对象 return result; } public static void main(String[] args) { CglibProxy cglibProxy = new CglibProxy(); UserDao userDao = (UserDao) cglibProxy.getInstance(new UserDao()); userDao.save(); } } ~~~