自定义注解，进行对象属性设置

Posted 2022-04-22 yzm2008

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;