java内省的几个例子

package casic.cn.test1;

public class Persion {

	public String name;
	public int age;
	
	public Persion(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
	
}

package casic.cn.test1;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

public class IntroSpectorTest {

	public static void main(String[] args) throws Exception {
		Persion p = new Persion("小明", 26);
		
		String name = "name";
		
		PropertyDescriptor pd = new PropertyDescriptor(name, p.getClass());
		Method methodGetName = pd.getReadMethod();
		Object retVal = methodGetName.invoke(p);
		System.out.println(retVal);
		
		
		PropertyDescriptor pd2 = new PropertyDescriptor(name, p.getClass());
		Method methodSetName = pd.getWriteMethod();
		methodSetName.invoke(p,"小紅");
		System.out.println(p.getName());
		
		System.out.println(getProperty(p, name));
	}
	
	public static Object getProperty(Object bean, String propertyName) throws Exception {
		
		Object retVal = null;
		BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
		PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
		for(PropertyDescriptor pd : pds) {
			if(pd.getName().equals(propertyName)) {
				Method method = pd.getReadMethod();
				retVal = method.invoke(bean);
			}
		}
		return retVal;
	}
	
}

Introspector 类

BeanInfo 类
PropertyDescriptor 类