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;
    }


}