MyBatis 如何获取子类的属性

public class user {  
    public int getId() {
        return id;
    } 
 
    public void setId(int id) {
        this.id = id;
    } 
 
    private  int id;  
}

public class vipUser extends user {
    public int getVip() {
        return vip;
    } 
 
    public void setVip(int vip) {
        this.vip = vip;
    } 
 
    private  int vip;
}

Selet(user user)

parameterType='user'
<if test="vip!=null">vipE=#{vip,jdbcType=int},</if>

void testuser(user user) throws IllegalAccessException {
Class clas= user.getClass();
/**
         * 返回一个 Field 对象，该对象反映此 Class 对象所表示的类或接口的指定已声明字段（包括私有成员
         */
             Field[] fields = clas.getDeclaredFields();
             for (Field f : fields) {
             /**
             * 取消默认 Java 语言访问控制检查的能力
             */
            f.setAccessible(true);
            System.out.println("属性名"+f.toString());  
            System.out.println("属性值:"+f.getInt(user));  
        }
//            System.out.println(user.getClass().getName());  
    }

public class Parent {
private String name = "5";
public String getInfo(){
        System.out.println(this); 
        return this.name;
}
public void get(){ 
    System.out.println(this); 
    Class aClass = this.getClass(); 
    //返回所有this对象的属性这里是Children1的属性,不包含继承的字段 
    Field[] fields = aClass.getDeclaredFields(); 
    //返回父类的属性，不包含继承的字段 
    //aClass.getSuperclass().getDeclaredFields(); 
    //返回此类的所有字段，包含继承的可访问的字段 
    //aClass.getFields(); 
    for (Field field : fields) { 
    try { 
            System.out.println(field.get(this).toString()); 
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } 
    }
} 
public Parent(){ 
} 
public void print(){
    System.out.println("I am Parent!!!"); 
}
} 
public class Children1 extends Parent{ 
public String name = "6"; 
Children1(){
}  
@Override 
public void print(){ 
    System.out.println("I am children1"); 
} 
}  
public class Test {   
public static void main(String arsg[]){ 
    Children1 children = new Children1(); 
    //因为父类的方法没有被覆盖，所以调用的是父类的方法。返回父类的属性值 
    System.out.println(children.getInfo()); 
    //内部采用反射机制，因为实例化的是子类 
    children.get(); 
    } 
}