cglib jar包中Enhancer的简单使用

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Enhancer中有几个常用的方法, setSuperClass和setCallback, 设置好了SuperClass后, 可以使用create创建代理对象

Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(EnhancerTest.class);

enhancer.setCallback(new MethodInterceptorImpl());
EnhancerDemo demo = (EnhancerDemo) enhancer.create();

//所有运行EnhancerTest类中的方法，都会被MethodInterceptorImpl拦截，通过执行MethodInterceptorImpl中的intercept方法来实现EnhancerTest方法。

完整代码：

import java.lang.reflect.Method;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class EnhancerTest {
   public static void main(String[] args) {
       Enhancer enhancer = new Enhancer();
       enhancer.setSuperclass(EnhancerTest.class);
       enhancer.setCallback(new MethodInterceptorImpl());

       EnhancerTest demo = (EnhancerTest) enhancer.create();
       demo.test();
       System.out.println(demo);
   }

   public void test() {
       System.out.println("EnhancerTest test()");
   }

   private static class MethodInterceptorImpl implements MethodInterceptor {
       public Object intercept(Object obj, Method method, Object[] args,
               MethodProxy proxy) throws Throwable {
           System.err.println("Before invoke " + method);
           Object result = proxy.invokeSuper(obj, args);
           System.err.println("After invoke" + method);
           return result;
       }
   }
}