说明：
作为反射工具类，通过对象和属性的名字获取对象属性的值，如果在当前对象属性没有找到，依次向上收集所有父类的属
性，直到找到属性值，没有找到返回null；
代码：
1.classUtil
package com.example.demo.utill; import java.lang.reflect.Field; /**
* description: TODO
* date: 2020/3/24 0024 下午 21:32
*
* @author : Administrator
* @since : 1.0
**/
public class ClassUtil { public static Object getPropertyValue(Object obj, String propertyName) throws IllegalAccessException {
Class<?> Clazz = obj.getClass();
Field field;
if ((field = getField(Clazz, propertyName)) == null)
return null;
field.setAccessible(true);
return field.get(obj);
} public static Field getField(Class<?> clazz, String propertyName) {
if (clazz == null)
return null;
try {
return clazz.getDeclaredField(propertyName);
} catch (NoSuchFieldException e) {
return getField(clazz.getSuperclass(), propertyName);
}
}
}
2.测试类和接口
package com.example.demo.utill; /**
* description: TODO
* date: 2020/3/24 0024 下午 21:50
*
* @author : Administrator
* @since : 1.0
**/
public class Person {
private String age; public String getAge() {
return age;
} public void setAge(String age) {
this.age = age;
}
}
package com.example.demo.utill; /**
* description: TODO
* date: 2020/3/24 0024 下午 21:42
*
* @author : Administrator
* @since : 1.0
**/
public class User extends Person{
private String name ; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
}
}
3.测试
package com.example.demo.utill; /**
* description: TODO
* date: 2020/3/24 0024 下午 21:41
*
* @author : Administrator
* @since : 1.0
**/
public class Test {
public static void main(String[] args) throws IllegalAccessException {
User u = new User();
u.setName("张三");
u.setAge("20");
Object o = ClassUtil.getPropertyValue(u,"ag1e");
System.out.println(o);
}
}
// outPut：null