自定义注解，进行对象属性设置

静态工具类：

/**
     * 注解字段 值重置
     *
     * @param dataList
     * @param <T>
     * @return
     */
    public static <T> List<T> fieldValReset(List<T> dataList) {
        if (CollectionUtils.isEmpty(dataList)) {
            return dataList;
        }
        dataList.forEach(t -> {
            Class clazz = t.getClass();
            List<Field> fields = new ArrayList<>();
            while (clazz != null){
                fields.addAll(new ArrayList<>(Arrays.asList(clazz.getDeclaredFields())));
                clazz = clazz.getSuperclass();//获取父类字段
            }
            for (Field field : fields) {
                LengthLimit lengthLimit = field.getAnnotation(LengthLimit.class);
                DecimalLimit decimalLimit = field.getAnnotation(DecimalLimit.class);
                if (lengthLimit == null && decimalLimit == null) {
                    continue;
                }
                try {
                    field.setAccessible(true);
                    Object origVal = field.get(t);
                    if (null != origVal) {
                        //length
                        if (null != lengthLimit) {
                            int fieldLength = lengthLimit.length();
                            if (origVal instanceof String) {
                                String val = origVal.toString();
                                if (val.length() > fieldLength) {
                                    field.set(t, val.substring(0, fieldLength));
                                } else {
                                    field.set(t, val);
                                }
                            }
                        }
                        //decimal
                        if (null != decimalLimit) {
                            int decimal = decimalLimit.decimal();
                            if (origVal instanceof BigDecimal) {
                                BigDecimal bd = new BigDecimal(origVal.toString());
                                field.set(t, bd.setScale(decimal, BigDecimal.ROUND_HALF_UP));
                            }
                        }
                    }
                } catch (IllegalAccessException e) {
                    log.error("反射解析字段属性出错:{}", e);
                }

            }
        });
        return dataList;
    }