public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    private String pkid;

    private String userName;

    private String passWord;

    private String roleID;

}

public class test {

        public static void main(String[] args) throws Exception{

            User e = new User();

            reflect(e);

        }

        public static void reflect(User e) throws Exception{

            Class cls = e.getClass();

            Field[] fields = cls.getDeclaredFields();

            for(int i=0; i<fields.length; i++){

                Field f = fields[i];

                f.setAccessible(true);

                System.out.println("属性名:" + f.getName() + " 属性值:" + f.get(e));

            }

        }

}