内省操作javabean的属性

 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;
     }

 }