@Before public void setUp() throws Exception { mongoClient.getMessageCollection(TOPIC_NAME).drop(); // 插入1条消息 SwallowMessage firstMsg = createMessage(); firstMsg.setContent("content1"); messageDAO.saveMessage(TOPIC_NAME, firstMsg); // 初始化tailMessageId tailMessageId = messageDAO.getMaxMessageId(TOPIC_NAME); // 添加9条Message int i = 2; while (i <= 10) { // 插入消息 SwallowMessage msg = createMessage(); msg.setContent("content" + i++); messageDAO.saveMessage(TOPIC_NAME, msg); } }