使用PropertyDescriptor反射调用setter/getter方法

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有时候我们只知道一个对象的字段，我们想通过反射的方式将此字段赋值，可直接写反射又太浪费时间，还需要自己手动拼接方法名，而java为我们提供了一个很方便的类(PropertyDescriptor)来操作这一过程。使用很简单，直接看代码：

代码

import com.pibgstar.demo.bean.User;

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

/**
 * @author pibigstar
 * @create 2018-12-03 18:36
 * @desc
 **/
public class TestPropertyDescriptor {

    public static void main(String[] args){
        TestPropertyDescriptor test = new TestPropertyDescriptor();
        User user = new User();
        user.setId("123");

        Object id = test.getAttribute("id", user);
        System.out.println("id:"+id.toString());

        test.setAttribute("name",user,"pibigstar");

        System.out.println(user);
    }

    /**
     * @Author:pibigstar
     * @Description: 根据字段获取属性值
     */
    private Object getAttribute(String filed,Object obj) {
        try {
            PropertyDescriptor pd = new PropertyDescriptor(filed,obj.getClass());
            // 获取getter方法
            Method method = pd.getReadMethod();
            Object result = method.invoke(obj);
            return result;
        } catch (IntrospectionException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
      return null;
    }

    /**
     * @Author:pibigstar
     * @Description: 设置属性字段值
     */
    private void setAttribute(String filed,Object obj,Object value) {
        try {
            PropertyDescriptor pd = new PropertyDescriptor(filed,obj.getClass());
            // 获取setter方法
            Method method = pd.getWriteMethod();
            method.invoke(obj, value);
        } catch (IntrospectionException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

User对象也放一下吧

public class User {
    private String id;
    private String name;
   // setter/getter 方法
}

运行结果

id:123
User{id='123', name='pibigstar'}