#### 原理 ``` 利用asm開源包，對代理對象類的class文件加載進來，通過修改其字節碼生成子類來處理 ``` ~~~ public class CglibProxy implements MethodInterceptor { private Object targetObject; // 這里的目標類型為Object，則可以接受任意一種參數作為被代理類，實現了動態代理 public Object getInstance(Object target) { // 設置需要創建子類的類 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("開啟事物"); Object result = proxy.invoke(targetObject, args); System.out.println("關閉事物"); // 返回代理對象 return result; } public static void main(String[] args) { CglibProxy cglibProxy = new CglibProxy(); UserDao userDao = (UserDao) cglibProxy.getInstance(new UserDao()); userDao.save(); } } ~~~