java反射取private字段

Class clazz = bean.getClass();
Field[] fields = clazz.getDeclaredFields();
String sign = "";
for (Field field : fields) {
　　//设置可以获取私有字段
    field.setAccessible(true);
    String key = field.toString().substring(field.toString().lastIndexOf(".") + 1);
    String value = (String) field.get(bean);
    if (value == null) {
        value = "";
    }

    //逻辑
}