我认为这是您代码的正确版本：
Session session = getCurrentSession();ProjectionList projectionList = Projections.projectionList(); projectionList.add(Projections.groupProperty("totalCode")) .add(Projections.groupProperty("activityCode")) .add(Projections.sum("amount")) .add(Projections.rowCount());Criteria criteria = session.createCriteria(Payment.class);criteria.setProjection(projectionList);List<Object[]> payments = criteria.list();for (Object[] payment : payments) { System.out.println("totalCode: " + payment[0]); System.out.println("activityCode: " + payment[1]); System.out.println("amountSum: " + payment[2]); System.out.println("rowCount: " + payment[3]);}
