Java中两种动态代理的实现

public interface Work {
    public void work();
}

public class WorkImpl implements Work {

    @Override
    public void work() {
        System.out.println("我在工作");
    }

}

public class LogHandler<T> implements InvocationHandler{
    
    public T target;
    
    private static Logger logger = Logger.getLogger(LogHandler.class);
    
    public LogHandler(T target){
        this.target = target;
    }
    
    @SuppressWarnings("unchecked")
    public T getInstance(){
        return (T) Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
    }
    
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        logger.warn("start");
        Object result = method.invoke(target, args);
        logger.warn("end");
        return result;
    }

}

public class Test {
    public static void main(String[] args) {
        Work w = new WorkImpl();
        w.work();
        Work logWork =  new LogHandler<Work>(w).getInstance();
        logWork.work();
    }
}

public class WorkImpl   {

    public void work() {
        System.out.println("我在工作");
    }

}

public class LogHandler<T> implements MethodInterceptor{
    
    public T target;
    
    private static Logger logger = Logger.getLogger(LogHandler.class);
    
    public LogHandler(T target){
        this.target = target;
    }
    
    @SuppressWarnings("unchecked")
    public T getInstance(){
        //使用CGLIB生成子类，并委托代理对象代理
        return (T) Enhancer.create(target.getClass(), this);
    }
    
    @Override
    public Object intercept(Object obj, Method method, Object[] args,
            MethodProxy proxy) throws Throwable {
        logger.warn("start!");
        Object result=proxy.invokeSuper(obj, args);
        logger.warn("end!");
        return result;
    }
    
}

public class Test {
    public static void main(String[] args) {
        WorkImpl w = new WorkImpl();
        w.work();
        WorkImpl logWork = new LogHandler<WorkImpl>(w).getInstance();
        logWork.work();
    }
}