内省操作javabean属性

内省操作javabean属性，javabean Person类。

public class Person {
	private String name;
	private String password;
	private int age;
	
	public String getAb(){
		return null;
	}
	
	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;
	}
	
}

import java.beans.BeanInfo;
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 Demo1 {

	// 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());
		}
	}

	// 得到bean的指定属性：get
	@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，为属性赋值
		Method method = pd.getWriteMethod(); // setAge

		method.invoke(p, 45);
		// System.out.println(p.getAge());

		// 获取属性值
		method = pd.getReadMethod();
		System.out.println(method.invoke(p, null));
	}
	
	//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());
	}
}