java通过反射(reflex)获取对象(Object)内部属性的值

用最简单直接的代码满足需求
话不多说，上代码，很简单，有几句注释看看就够了

首先随便建立个实体类

import java.util.List;

/**
 * @author q3311
 *
 */
public class People {

	private int age;
	private boolean sex;
	private String name;
	private List<String> sonName;
	
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public boolean isSex() {
		return sex;
	}
	public void setSex(boolean sex) {
		this.sex = sex;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public List<String> getSonName() {
		return sonName;
	}
	public void setSonName(List<String> sonName) {
		this.sonName = sonName;
	}
	
}

然后是测试类，soeasy

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

/**
 * @author q3311
 *
 */
public class ReflexTest {
	
	public void process() {
		People zhangsan = new People();
		zhangsan.setAge(20);
		zhangsan.setSex(true);
		zhangsan.setName("xiaosan");
		List<String> sonName = new ArrayList<String>();
		sonName.add("haha");
		sonName.add("hehe");
		zhangsan.setSonName(sonName);
		run(zhangsan);
	}
	
	public void run(Object obj) {
		
		Field field;
		try {
			// 通过反射获得Zhangsan类中叫sonName的属性
			field = obj.getClass().getDeclaredField("sonName");
			// 设置外部可以访问
			field.setAccessible(true);
			// 得到这个对象的属性并且强转成list
			List list = (List)field.get(obj);
			for (int i = 0; i < list.size(); i++) {
				System.out.println("list is:" + list.get(i));
			}
			// 清空field
			field = null;
			// 方法同上，此次得到的是String类型
			field = obj.getClass().getDeclaredField("name");
			field.setAccessible(true);
			String string = field.get(obj).toString();
			System.out.println("name is:" + string);
		} catch (NoSuchFieldException | SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	
	}

	public static void main(String[] args) {
		ReflexTest reflexTest = new ReflexTest();
		reflexTest.process();
		
	}
		
}