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));
         }

 }