java 的 invoke 的使用方法

package com.hua.invoke;

public class UserInfoBean {
	private String username;
	private String age;

	public String getUsername() {
		System.out.println("getUsername method be called");
		return username;
	}

	public void setUsername(String username) {
		System.out.println("setUsername method be called");
		this.username = username;
	}

	public String getAge() {
		System.out.println("getAge method be called");
		return age;
	}

	public void setAge(String age) {
		System.out.println("setAge method be called");
		this.age = age;
	}

}

 

package com.hua.invoke;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ReflectTest {
	
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		try {
			Class clazz = Class.forName("com.hua.invoke.UserInfoBean");
			Object obj = clazz.newInstance();
			Field[] fields = clazz.getDeclaredFields();
			String name="chenhua";
			for (Field f : fields) {
				PropertyDescriptor pd;
				pd = new PropertyDescriptor(f.getName(), clazz);
				Method wM = pd.getWriteMethod();
				wM.invoke(obj, name);
				System.out.println(wM.getName()+"========="+name);
			}
			for (Field f : fields) {
				PropertyDescriptor pd;
				pd = new PropertyDescriptor(f.getName(), clazz);
				Method rM = pd.getReadMethod();
				String num = (String) rM.invoke(obj);
				System.out.println(rM.getName() + "==" + num);
			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (IntrospectionException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
	}
}