package Chapter5; import java.beans.BeanInfo; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /* * java内省Introspection：java JDK中提供一套方法访问JavaBean的get，set方法 * */ public class IntrospectionTest { public static void main(String[] args) { try { Class userClass=Class.forName("Chapter5.User"); User user=(User) userClass.newInstance(); BeanInfo beanInfo=Introspector.getBeanInfo(userClass); //得到有getset方法的属性列表 PropertyDescriptor[] pros= beanInfo.getPropertyDescriptors(); for(PropertyDescriptor pro:pros){ System.out.println("--属性"+pro.getName()); if(pro.getName().equals("name")){ //得到写方法 System.out.println("执行name的写方法"); Method setMethod= pro.getWriteMethod(); setMethod.invoke(user, "张三"); }else if(pro.getName().equals("number")){ //得到写方法 Method setMethod= pro.getWriteMethod(); setMethod.invoke(user, 1); } if(pro.getName().equals("name")||pro.getName().equals("number")){ //得到读方法 Method getMethod=pro.getReadMethod(); System.out.println("get方法："+getMethod.invoke(user)); } } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IntrospectionException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }