学习Struts的过程中认识了DynaBean，一时不理解何为动态Bean。看了以下的例子，
就很容易明白了。
import java.util.Date;
import org.apache.commons.beanutils.BasicDynaClass;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.beanutils.DynaProperty;
public class TestService {
public static void main(String[] hey) throws Exception{
DynaProperty[] pro = new DynaProperty[]{//准备一个属性，动态定义类依靠这些属性来决定类的构成。
new DynaProperty("title", String.class),
new DynaProperty("content", String.class),
new DynaProperty("createdTime", Date.class),
new DynaProperty("id", Integer.class),
};
DynaClass articleClass = new BasicDynaClass("Article",null,pro);//定义了一个类
DynaBean article = articleClass.newInstance();//声明了一个ArticleClass的对象
article.set("title","this is a test");//对该对象进行操作
article.set("content","oh my god");
article.set("createdTime",new Date());
article.set("id",new Integer(1));
System.out.println(article.get("title"));
System.out.println(article.get("content"));
System.out.println(article.get("createdTime"));
System.out.println(article.get("id"));
}
}