动态代理的几种方式

动态代理有Java Proxy，CGLib,JAVAssist等几种实现方式。

1、初探java的Proxy+InvocationHandler

reference:http://m.oschina.net/blog/224931

English page:https://docs.oracle.com/javase/7/docs/api/java/lang/reflect/Proxy.html

public interface Colorable {

    public void value();
    
}

public class RedColor implements Colorable {

    @Override
    public void value() {
        System.out.println("--------------red-------------");
    }

}

public class ColorableProxy implements InvocationHandler {

    private Colorable colorable;
    private Colorable proxy;
    
    public ColorableProxy(Colorable colorable) {
        this.colorable = colorable;
        this.proxy = (Colorable)Proxy.newProxyInstance(Colorable.class.getClassLoader(), new Class<?>[] { Colorable.class }, this);
    }
    
    public Colorable getProxy() {
        return proxy;
    }
    
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        String methodName = method.getName();

        System.out.println("===========starting invoke function:" + methodName + "==========");
        
        Object result = method.invoke(colorable, args);
        
        System.out.println("=========== invoke function:" + methodName + " success==========");
        return result;
    }

}

public class Main {

    public static void main(String[] args) {
        
        Colorable proxy = new ColorableProxy(new RedColor()).getProxy();
        proxy.value();
    }

}

 2、几种动态代理的比较：http://it.deepinmind.com/java/2014/02/24/%E5%8A%A8%E6%80%81%E4%BB%A3%E7%90%86%E5%AE%9E%E7%8E%B0%E7%9A%84%E6%AF%94%E8%BE%83.html