通过反射查找子类、父类的属性（子类找不到则到父类找）

拼搏现实的明天。 2021-10-29 10:48 337阅读 0赞

package cn.ucmed.pangu.lib;
    
    import lombok.extern.slf4j.Slf4j;
    
    import java.lang.reflect.Field;
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    
    @Slf4j
    public class ReflectionUtil {
        /**
         * 根据属性名查找对应的属性，子类没有的属性会到父类找
         *
         * @param o
         * @param fieldName
         * @return
         */
        public static Field getDeclareField(Object o, String fieldName) {
            Field field = null;
            Class<?> clazz = o.getClass();
            for (; clazz != Object.class; clazz = clazz.getSuperclass()) {
                try {
                    field = clazz.getDeclaredField(fieldName);
                } catch (NoSuchFieldException e) {
                    log.warn("bean没有该属性，bean = " + clazz.getName() + "，属性 = " + fieldName);
                }
            }
            return field;
        }
    
        /**
         * 属性设值
         *
         * @param o         子类对象
         * @param fieldName 属性名
         * @param value     需要设置的属性值
         */
        public static void setFieldValue(Object o, String fieldName, Object value) {
            Field field = getDeclareField(o, fieldName);
            if (field != null) {
                field.setAccessible(true);
                try {
                    field.set(o, value);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            } else {
                log.error("对象没有该属性，对象 = " + o.getClass() + " 属性 = " + fieldName);
            }
        }
    
        public static Object getFieldName(Object o, String fieldName) {
            Field field = getDeclareField(o, fieldName);
            if (field != null) {
                field.setAccessible(true);
                try {
                    return field.get(o);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    
        /**
         * 获取对象所有的属性，包括父类的属性
         *
         * @param o
         * @return
         */
        public static Field[] getAllProperties(Object o) {
            Class clazz = o.getClass();
            List<Field> fieldList = new ArrayList<>();
            while (clazz != null) {
                fieldList.addAll(new ArrayList<>(Arrays.asList(clazz.getDeclaredFields())));
                clazz = clazz.getSuperclass();
            }
            Field[] fields = new Field[fieldList.size()];
            fieldList.toArray(fields);
            return fields;
        }
    }

转载于:https://www.cnblogs.com/miaoying/p/10104786.html