CGLIB动态代理类

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 CglibProxy implements MethodInterceptor {  private Object target;  /** * 创建代理对象 *  * @param target * @return */  public Object getInstance(Object target) {  this.target = target;  Enhancer enhancer = new Enhancer();  enhancer.setSuperclass(this.target.getClass());  // 回调方法  enhancer.setCallback(this);  // 创建代理对象  return enhancer.create();  }  @Override  // 回调方法  public Object intercept(Object obj, Method method, Object[] args,  MethodProxy proxy) throws Throwable {  System.out.println("事物开始CGLIB");  proxy.invokeSuper(obj, args);  System.out.println("事物结束CGLIB");  return null;  }  }  

java动态代理类

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;import org.springframework.aop.framework.AopProxy;public class ClassProxy implements InvocationHandler ,AopProxy{  private Object target;  /** * 绑定委托对象并返回一个代理类 * @param target * @return */  public Object bind(Object target) {  this.target = target;  //取得代理对象  return Proxy.newProxyInstance(target.getClass().getClassLoader(),  target.getClass().getInterfaces(), this);   //要绑定接口(这是一个缺陷，cglib弥补了这一缺陷)  }  @Override  /** * 调用方法 */  public Object invoke(Object proxy, Method method, Object[] args)  throws Throwable {  Object result=null;  System.out.println("事物开始");  //执行方法  result=method.invoke(target, args);  System.out.println("事物结束");  return result;  }@Overridepublic Object getProxy() {System.out.println("test getProxy");return null;}@Overridepublic Object getProxy(ClassLoader classLoader) {System.out.println("test getProxy");return null;}
}

尝试在java动态代理上进行java动态代理或者cglib代理，或者cglib代理上进行java动态代理或者cglib代理测试结果如下：

import java.lang.reflect.Modifier;import org.springframework.aop.framework.AopProxy;public class TestProxy {public static void main(String[] args) {
//      ClassProxy proxy = new ClassProxy();
//      AopProxy bookProxy = (AopProxy) proxy.bind(new ClassProxy());
//      bookProxy.getProxy();
//      int i = bookProxy.getClass().getModifiers();
//        String mods = Modifier.toString(i);
//        System.out.println("Class modifiers: " + mods);
//      CglibProxy cglib = new CglibProxy();
//      ClassProxy bookCglib=(ClassProxy)cglib.getInstance(new ClassProxy());
//      bookCglib.getProxy();
//      ClassProxy bookCglib2=(ClassProxy)cglib.getInstance(bookCglib);
//      bookCglib2.getProxy();//JDK代理后再进行一层jdk代理，测试结果不可以，循环调用，造成代理的死循环
//      ClassProxy proxy = new ClassProxy();
//      AopProxy bookProxy = (AopProxy) proxy.bind(new ClassProxy());
//      AopProxy bookProxy2 = (AopProxy) proxy.bind(bookProxy);
//      bookProxy2.getProxy();//jdk代理后再用cglib进行代理，测试结果不行，因为jdk代理后的类是public final类型的，cglib不能对final的类进行代理
//      ClassProxy proxy = new ClassProxy();
//      AopProxy bookProxy = (AopProxy) proxy.bind(new ClassProxy());
//      bookProxy.getProxy();
//      int i = bookProxy.getClass().getModifiers();
//        String mods = Modifier.toString(i);
//        System.out.println("Class modifiers: " + mods);
//      CglibProxy cglib = new CglibProxy();
//      ClassProxy bookCglib=(ClassProxy)cglib.getInstance(bookProxy);
//      bookCglib.getProxy();//CGlib代理后再进行cglib代理，测试结果不可以  Caused by: java.lang.ClassFormatError: Duplicate method name&signature
//      CglibProxy cglib = new CglibProxy();
//      ClassProxy bookCglib=(ClassProxy)cglib.getInstance(new ClassProxy());
//      ClassProxy bookCglib2=(ClassProxy)cglib.getInstance(bookCglib);
//      bookCglib2.getProxy();//CGlib代理后再进行jdk代理，测试结果不可以，因为CGlib代理后已经改变了类的签名，而jdk必须知道类的接口和实现CglibProxy cglib = new CglibProxy();ClassProxy bookCglib=(ClassProxy)cglib.getInstance(new ClassProxy());  bookCglib.getProxy();ClassProxy proxy = new ClassProxy();AopProxy bookProxy = (AopProxy) proxy.bind(bookCglib);bookProxy.getProxy();}}