Introspector

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
public class IntrospectorDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        IntrospectorDemo id=new IntrospectorDemo();
        try {
            id.test1();
            id.test2();
            id.test3();
            id.test4();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    

    public class Person
    {
        public Person(){
        }
        public Person(String name,int age){
            this.name=name;
            this.age=age;
        }
        private String name;
        private int 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;
        }
        
    }
     
        //获得person类的所有bean属性
         
        public void test1() throws Exception{
            BeanInfo info = Introspector.getBeanInfo(Person.class);
            PropertyDescriptor[] pds = info.getPropertyDescriptors();
            for(PropertyDescriptor pd:pds){
                System.out.println(pd.getPropertyType()+" "+pd.getName());
            }
        }
        //获得Person（不包含Object类）的所有bean属性
         
        public void test2() throws Exception{
            BeanInfo info = Introspector.getBeanInfo(Person.class,Object.class);
            PropertyDescriptor[] pds = info.getPropertyDescriptors();
            for(PropertyDescriptor pd:pds){
                System.out.println(pd.getPropertyType()+" "+pd.getName());
            }
        }
        //设置Person的age属性
         
        public void test3() throws Exception{
            Person p = new Person();
            PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);
            Method method = pd.getWriteMethod();
            method.invoke(p, 20);
            System.out.println(p.getAge());
        }
        //调用Person的getAge()
         
        public void test4() throws Exception{
            Person p = new Person("xiazdong",30);
            PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);
            Method method = pd.getReadMethod();
            System.out.println(method.invoke(p, null));
        }
     
}