java - Discord 机器人异常重复

Question

所以我正在尝试创建一个 discord 机器人，它可以简单地访问数据库以打印出值，我的代码目前会将值打印到 discord 服务器，但它会重复 5 次。

机器人功能类:

private MySQLAccess sql = new MySQLAccess();

public static void main(String[] args) throws Exception {
    JDABuilder ark = new JDABuilder(AccountType.BOT);
    ark.setToken("insert_discord_token_here");
    ark.addEventListener(new MessageListener());
    ark.buildAsync();
}



@Override
public void onMessageReceived(MessageReceivedEvent e) {
    if (e.getAuthor().isBot()) return;
    Message msg = e.getMessage();
    String str = msg.getContentRaw();

    //Ping pong
    if (str.equalsIgnoreCase("!ping")) {
        e.getChannel().sendMessage("Pong!").queue();
    }

    //Bal check
    if (str.contains("!bal")) {
        String user = str.substring(5);
        System.out.println(user);
        try {
            sql.readDataBase(e.getChannel(), user);
        } catch (Exception e1) {
        }

    }
}

数据库访问类:

private Connection connect = null;
private Statement statement = null;
private ResultSet resultSet = null;
private final String user = "pass";
private final String pass = "user";


public void readDataBase(MessageChannel msg, String username) throws Exception {
    //Retrieve data and search for username
    try {
        Class.forName("com.mysql.cj.jdbc.Driver");

        connect = DriverManager.getConnection("jdbc:mysql://localhost/serverusers?allowPublicKeyRetrieval=true&useSSL=false", user, pass);

        statement = connect.createStatement();
        resultSet = statement
                .executeQuery("select * from serverusers.userinfo where user=\"" + username + "\"");
        writeResultSet(resultSet, msg);

    } catch (Exception e) {
        throw e;
    } finally {
        close();
    }

}

private void writeResultSet(ResultSet resultSet, MessageChannel msg) throws SQLException {
    // Check resultSet and print its contents
    if (resultSet.next()) {
        String user = resultSet.getString(2);
        Double website = resultSet.getDouble(3);
        msg.sendMessage("User: " + user).queue();
        msg.sendMessage("Bank Amount: " + website).queue();
    }
}

private void close() {
    try {
        if (resultSet != null) {
            resultSet.close();
        }

        if (statement != null) {
            statement.close();
        }

        if (resultSet != null) {
            resultSet.close();
        }
        if (connect != null) {
            connect.close();
        }
    } catch (Exception e) {

    }
}

当程序运行时，它找到了我正在寻找的正确数据，搜索功能也很好，但由于某些奇怪的原因，程序会吐出相同的用户名并平衡 5 次。 Screenshot of Discord Bot

Answer 1

这里的常见错误是您多次运行该程序，然后每个实例都相应地响应相同的内容。您可以通过打开任务管理器并查找 Java 进程来检查是否是这种情况。这通常发生在使用 Eclipse IDE 的开发人员身上，因为控制台将其他进程隐藏在控制台的下拉菜单后面。