Java redis demo List<User>

@Testpublic void test2(){ValueOperations<String, String> userOp = redisTemplate.opsForValue();List<User> userList = userDAO.getUserByIds();userOp.set("1234",CommonsUtil.returnNonNullObjectToJson(userList));String retStr = userOp.get("1234");JsonBinder jb = JsonBinder.buildNormalBinder();            JavaType javaType = jb.getCollectionType(ArrayList.class,User.class);          @SuppressWarnings("unchecked")List<User> listUser = (List<User>) jb.getReadValue(retStr, javaType);          logger.info("size："+ listUser.size());for (User u : listUser) {logger.info(u.getUsername());}}