cglib代理与jdk动态代理示例

先看基于jdk实现的动态代理实现例子

1、先声明一个接口类

1 public interface UserService{
2   
3     public String getName(String msg);    
4 }

2、实现上面定义的接口类

1 public class UserServiceImpl implements UserService {
2 
3       @Override
4       public String getName(String msg) {
5              System.out.println("###enter getName method###");
6              return msg;
7       }
8 }

3、实现InvocationHandler接口类

 1 import java.lang.reflect.Method;
 2 import java.lang.reflect.InvocationHandler;
 3 
 4 public class MyInvocationHandler implements InvocationHandler {
 5 
 6       private Object targetObj;
 7      
 8       public MyInvocationHandler(){}
 9 
10       public MyInvocationHandler(Object obj) {
11   
12              this.targetObj = obj;    
13       }
14 
15       @Override
16       public Object invoke(Object proxy, Method method, Object[] args)     
17       throws  Throwable {
18 
19                 System.out.println("###enter invoke method pre###");
20                 Object result = method.invoke(targetObj, args);
21                 System.out.println("###enter invoke method after###");
22                 return result;
23       }
24 }

4、测试类

 1 public class JdkProxyMain{
 2   
 3     public static void main(String[] args) {
 4 
 5            UserService service = new UserServiceImpl();
 6            InvocationHandler invoke = new MyInvocationHandler();
 7 
 8            UserService proxy = (UserService)Proxy.newProxyInstance(service.getClass().getClassLoader(), service.getClass().getInterfaces(), invoke);
 9            proxy.getName();
10     }
11 }

Cglib动态代理示例(还是基于上面的接口类及实现接口类,cglib也支持类的实现方式来支持动态代理，需引入cglib jar包)

1 public class CglibProxy implements MethodInterceptor {
2 
3       @Override
4       public Object intercept(Object target, Method method, Object[] params,  MethodProxy methodProxy) throws Throwable {
                System.out.println("....enter invoke pre...");
                methodProxy.invokeSuper(target, params); 
                System.out.println("...enter invoke end...");
5               return null;  
6       }
7 }

 1 public class CglibMain{
 2 
 3     public static void main(String[] args) {
 4             System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, "F:\\code");//设置生成代理类的路径
 5             CglibProxy cglib = new CglibProxy();
 6             Enhancer enhancer = new Enhancer();
 7             enhancer.setSuperclass(UserServiceImpl.class);
 8             enhancer.setCallback(cglib);
 9 
10             UserService service = (UserService)enhancer.create();
11             String result service.getName("cglib");
12     }
13 
14 }