Column中isNull取到的是true时，Java实体属性为Number类型时会转换异常

[ranxiaoyu]

   @Override
    <R> R newInstance(Class<R> c, List<CanalEntry.Column> columns) throws Exception {
        R object = c.newInstance();
        Map<String, String> columnNames = EntryUtil.getFieldName(object.getClass());
        for (CanalEntry.Column column : columns) {
            String fieldName = columnNames.get(column.getName());
            if (StringUtils.isNotEmpty(fieldName)) {
                FieldUtil.setFieldValue(object, fieldName, column.getValue());
            }
        }
        return object;
    }

    static Object convertType(Class<?> type, String columnValue) {
        if(columnValue==null){
            return null;
        }else if (type.equals(Integer.class)) {
            return Integer.parseInt(columnValue);
        } else if (type.equals(Long.class)) {
            return Long.parseLong(columnValue);
        } else if (type.equals(Boolean.class)) {
            return convertToBoolean(columnValue);
        } else if (type.equals(BigDecimal.class)) {
            return new BigDecimal(columnValue);
        } else if (type.equals(Double.class)) {
            return Double.parseDouble(columnValue);
        } else if (type.equals(Float.class)) {
            return Float.parseFloat(columnValue);
        } else if (type.equals(Date.class)) {
            return parseDate(columnValue);
        } else if (type.equals(java.sql.Date.class)) {
            return parseDate(columnValue);
        } else {
            return columnValue;
        }
    }