Java动态代理之cglib

public class BankService {
public void save(){
System.out.println("存钱...");
}
}

public class ServiceEnhancer {
public static void before(){
System.out.println("检查钱是否完整无存");
}

public static void after(){
System.out.println("如果有错，就回滚");
}
}

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 Enhancer enhancer = new Enhancer();

public Object getProxy(Class<?> clazz){
//设置 需要创建子类的类
enhancer.setSuperclass(clazz);
enhancer.setCallback(this);

return enhancer.create();//通过字节码技术创建子类实例
}

@Override
public Object intercept(Object obj, //目标类实例
Method method, //目标类方法的反射对象
Object[] args, //方法的动态入参
MethodProxy proxy //代理类实例
) throws Throwable {
ServiceEnhancer.before();
Object result = proxy.invokeSuper(obj, args);
ServiceEnhancer.after();
return result;
}

}

public class CglibDemo {
public static void main(String[] args) {
CglibProxy proxy = new CglibProxy();

BankService bankservice = (BankService) proxy.getProxy(BankService.class);

bankservice.save();

//com.proxy.cglib.BankService$$EnhancerByCGLIB$$82923c9a@2e5d6d97
//System.out.println(bankservice);
}
}