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));

         }

 }