import java.beans.BeanInfo;

 import java.beans.IntrospectionException;

 import java.beans.Introspector;

 import java.beans.PropertyDescriptor;

 import java.lang.reflect.Method;

 import org.junit.Test;

 //使用内省api操作bean的属性

 public class Demo {

     /**

      *

      * @throws Exception

      *

      */

     //得到bean的所有属性

     @Test

     public void test1() throws Exception{

         BeanInfo info = Introspector.getBeanInfo(Person.class,Object.class);

         PropertyDescriptor[] pds = info.getPropertyDescriptors();

         for(PropertyDescriptor pd : pds){

             System.out.println(pd.getName());

         }

     }

     //操纵bean的指定属性:age

     @Test

     public void test2() throws Exception{

         Person p = new Person();

         PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);

         //得到属性的写方法，为属性复制

         Method method = pd.getWriteMethod();//public void setAge(){}

         method.invoke(p, 32);

         //获取属性的值

         method = pd.getReadMethod();//public void getAge(){}

         System.out.println(method.invoke(p, null));

     }

     //高级点的内容，获取当前操作属性的类型

     @Test

     public void test3() throws Exception{

         Person p = new Person();

         PropertyDescriptor pd = new PropertyDescriptor("age", Person.class);

         System.out.println(pd.getPropertyType());

     }

 }

 public class Person {// javabean

     private String name;

     private String password;

     private int age;

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public String getPassword() {

         return password;

     }

     public void setPassword(String password) {

         this.password = password;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

     public String getAb(){

         return null;

     }

 }