Field[] fields = clazz.getDeclaredFields();
for (Field field : fields) {
ExcelField excelField = field.getAnnotation(ExcelField.class);
if (excelField != null) {
field.setAccessible(true);
fieldMap.put(excelField.position(), field);
}
}
excelMapCache.put(clazz.getName(), fieldMap);
return fieldMap;
}