反射操作get、set方法

反射操作get、set方法

今天学习到了一个工具类PropertyDescriptor，通过它我们可以更方便反射get、set方法，类的完整包路径如下：java.beans.PropertyDescriptor

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
 
/**
 * 反射操作类,通过bean工具类更简单的操作get、set方法
 * 
 * @author chinoukin
 *
 */
public class RefelectTest {
 
	public static void main(String[] args)
			throws IntrospectionException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		Student s = new Student();
		s.setName("张三");
		s.setAge(20);
 
		String propertyName = "name";
 
		Object retVal = getPropertyVal(propertyName, s);
		System.out.println(retVal);
 
		String newVal = "李四";
		setPropertyVal(propertyName, s, newVal);
		System.out.println(s.getName());
	}
 
	private static void setPropertyVal(String propertyName, Object s, Object newVal)
			throws IntrospectionException, IllegalAccessException, InvocationTargetException {
		PropertyDescriptor pd = new PropertyDescriptor(propertyName, s.getClass());
		Method setMethod = pd.getWriteMethod();
		setMethod.invoke(s, newVal);
	}
 
	private static Object getPropertyVal(String propertyName, Object s)
			throws IntrospectionException, IllegalAccessException, InvocationTargetException {
		PropertyDescriptor pd = new PropertyDescriptor(propertyName, s.getClass());
		Method getMethod = pd.getReadMethod();
		Object retVal = getMethod.invoke(s);
		return retVal;
	}
 
}
 
/**
 * javabean
 * 
 * @author chinoukin
 *
 */
class Student {
	private String name;
	private int age;
 
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	public int getAge() {
		return age;
	}
 
	public void setAge(int age) {
		this.age = age;
	}
 
}