java - Spigot API - 从玩家获取多个字符串

Question

我试图做到这一点，当您单击一个标志时，它会显示“输入您的标签”，然后您输入您的标签，然后它会显示“输入您的括号颜色”，然后您输入您的括号颜色，然后输入您的命名颜色，然后聊天颜色。它有效，但有时括号颜色设置名称颜色，一旦我设置聊天颜色，它可能会这样做。谁能告诉我我的代码有什么问题吗？

ArrayList<Player>  input = new ArrayList<Player>();
@EventHandler
public void onChat(AsyncPlayerChatEvent event){
    Player p = event.getPlayer();
    if(input.contains(p)){
        String tag = event.getMessage();
        event.setCancelled(true);
        if(tag.equals("clear")){
            UUID playerid = p.getUniqueId();
            FileConfiguration cfg = getTagsConfig();
            cfg.set("tags." + playerid + ".tag", null);
            p.sendMessage(ChatColor.GREEN + "Tag Cleared!");
        }
        else{
            UUID playerid = p.getUniqueId();
            FileConfiguration cfg = getTagsConfig();
            cfg.set("tags." + playerid + ".tag", tag);
            p.sendMessage(ChatColor.GREEN + "Your prefix is now " + tag);
        }
        saveTagsFile();
        input.remove(p);
        p.sendMessage(ChatColor.RED + "Enter a bracket color (lowercase)");
        p.sendMessage(ChatColor.GREEN + "a" + ChatColor.AQUA + "b" + ChatColor.RED + "c" + ChatColor.LIGHT_PURPLE + "d" + ChatColor.YELLOW + "e" + ChatColor.WHITE + "f" + ChatColor.DARK_BLUE + "1" + ChatColor.DARK_GREEN + "2" + ChatColor.DARK_AQUA + "3" + ChatColor.DARK_RED + "4" + ChatColor.DARK_PURPLE + "5" + ChatColor.GOLD + "6" + ChatColor.GRAY + "7" + ChatColor.DARK_GRAY + "8" + ChatColor.BLUE + "9" + ChatColor.BLACK + "0");
        input2.add(p);
    }
}
ArrayList<Player> input2 = new ArrayList<Player>();
@EventHandler
public void onChat2(AsyncPlayerChatEvent event){
    Player p = event.getPlayer();
    if(input2.contains(p)){
        p.sendMessage(ChatColor.RED + "Enter a bracket color (lowercase)");
        p.sendMessage(ChatColor.GREEN + "a" + ChatColor.AQUA + "b" + ChatColor.RED + "c" + ChatColor.LIGHT_PURPLE + "d" + ChatColor.YELLOW + "e" + ChatColor.WHITE + "f" + ChatColor.DARK_BLUE + "1" + ChatColor.DARK_GREEN + "2" + ChatColor.DARK_AQUA + "3" + ChatColor.DARK_RED + "4" + ChatColor.DARK_PURPLE + "5" + ChatColor.GOLD + "6" + ChatColor.GRAY + "7" + ChatColor.DARK_GRAY + "8" + ChatColor.BLUE + "9" + ChatColor.BLACK + "0");
        String brackets = event.getMessage();
        event.setCancelled(true);
        if(brackets.equals("a")||brackets.equals("b")||brackets.equals("c")||brackets.equals("d")||brackets.equals("e")||brackets.equals("f")||brackets.equals("1")||brackets.equals("2")||brackets.equals("3")||brackets.equals("4")||brackets.equals("5")||brackets.equals("6")||brackets.equals("7")||brackets.equals("8")||brackets.equals("9")||brackets.equals("0")){
            UUID playerid = p.getUniqueId();
            FileConfiguration cfg = getTagsConfig();
            cfg.set("tags." + playerid + ".brackets", brackets);
            p.sendMessage(ChatColor.GREEN + "Bracket color set to: " + "" + brackets);
        }
        else{
            return;     
        }
        saveTagsFile();
        input2.remove(p);
        p.sendMessage(ChatColor.RED + "Enter a name color (lowercase)");
        p.sendMessage(ChatColor.GREEN + "a" + ChatColor.AQUA + "b" + ChatColor.RED + "c" + ChatColor.LIGHT_PURPLE + "d" + ChatColor.YELLOW + "e" + ChatColor.WHITE + "f" + ChatColor.DARK_BLUE + "1" + ChatColor.DARK_GREEN + "2" + ChatColor.DARK_AQUA + "3" + ChatColor.DARK_RED + "4" + ChatColor.DARK_PURPLE + "5" + ChatColor.GOLD + "6" + ChatColor.GRAY + "7" + ChatColor.DARK_GRAY + "8" + ChatColor.BLUE + "9");
        input3.add(p);
    }
}
ArrayList<Player> input3 = new ArrayList<Player>();
@EventHandler
public void onChat3(AsyncPlayerChatEvent event){
    Player p = event.getPlayer();
    if(input3.contains(p)){
        p.sendMessage(ChatColor.RED + "Enter a name color (lowercase)");
        p.sendMessage(ChatColor.GREEN + "a" + ChatColor.AQUA + "b" + ChatColor.RED + "c" + ChatColor.LIGHT_PURPLE + "d" + ChatColor.YELLOW + "e" + ChatColor.WHITE + "f" + ChatColor.DARK_BLUE + "1" + ChatColor.DARK_GREEN + "2" + ChatColor.DARK_AQUA + "3" + ChatColor.DARK_RED + "4" + ChatColor.DARK_PURPLE + "5" + ChatColor.GOLD + "6" + ChatColor.GRAY + "7" + ChatColor.DARK_GRAY + "8" + ChatColor.BLUE + "9");
        String name = event.getMessage();
        event.setCancelled(true);
        if(name.equals("a")||name.equals("b")||name.equals("c")||name.equals("d")||name.equals("e")||name.equals("f")||name.equals("1")||name.equals("2")||name.equals("3")||name.equals("4")||name.equals("5")||name.equals("6")||name.equals("7")||name.equals("8")||name.equals("9")){
            UUID playerid = p.getUniqueId();
            FileConfiguration cfg = getTagsConfig();
            cfg.set("tags." + playerid + ".name", name);
            p.sendMessage(ChatColor.GREEN + "Name color set to: " + "" + name);
        }
        else{
            return;     
        }
        saveTagsFile();
        input3.remove(p);
    }
}

Answer 1

我当然理解您想要完成的任务以及您的“队列”概念(即input、input2 等)是可靠的。然而，实际控制的实现却让一些人假设不一定成立。

重复提示
正如 MrDarkLynx 已经指出的那样，您正在发送双重提示。幸运的是，这只是外观问题。

事件监听器调用顺序
鉴于您的事件处理程序都具有相同的事件优先级(正常)，因此不能保证您它们按照定义的顺序调用(即 onChat() → onChat2()→ onChat3())。

维护事件监听器的

HandlerList 确实使用数组和 ArrayList，但是SimplePluginManager 的监听器注册没有。您的 Activity 顺序可能会改变服务器重新启动之间。调用顺序在服务器 session 期间将保持一致，除非它们在插件管理器中取消注册并重新注册。

取消 Activity
取消事件不会阻止您或其他插件的事件处理程序处理该事件事件。取消仅将事件标记为已取消。您必须明确检查它

if ( event.isCancelled() )
    return;

或在事件注释中指定

@EventHandler( ignoreCancelled=true )

DIY解决方案

本质上，您想要实现的是一个管理对话的状态机在您的插件和玩家之间，在此期间系统会提示玩家提供答案，直到完成任务已完成或取消。

DIY 方法是实现一个实际的状态机，其每当玩家导致某些事件发生时就会触发执行。我引用这个解决方案作为DIY，因为有更好的解决方案，我将在下面进一步介绍。

下面的代码是事件处理程序的一个模型，它是一个单一的状态机能够维护多个玩家的状态。请记住，虽然此代码有效，它纯粹用于教育和演示目的。使用风险由您自行承担。

public class DyiTagController implements Listener {
    private static final String VALID_COLOR_PAT = "^[a-f0-9]$";

    /** Valid controller states*/
    private enum TagState {
        PREFIX, BRACKET, NAME, DONE, ERR
    };

    /** Registry of current player sessions */
    private final Map<Player, PlayerSession> sessions = new HashMap<>();

    /**
     * Constructs a DyiTagController and self-registers itself as event listener
     * 
     * @param plugin main plugin reference
     */
    public DyiTagController( JavaPlugin plugin ) {
        Bukkit.getPluginManager().registerEvents( this, plugin );
    }

    /**
     * Only process un-cancelled chat events. If player has an active state, handle chat
     * message as input to be further validated; otherwise, ignore it.
     * 
     * @param event chat event record
     */
    @EventHandler( ignoreCancelled = true )
    public void onPlayerChat( AsyncPlayerChatEvent event ) {
        Player player = event.getPlayer();
        if ( sessions.containsKey( event.getPlayer() ) ) {
            processResponse( player, event.getMessage() );
            event.setCancelled( true );
        }
    }


    /**
     * Handle sign interaction to start a dialog.
     * 
     * @param event player interaction record
     */
    @EventHandler( ignoreCancelled = true )
    public void onPlayerInteract( PlayerInteractEvent event ) {
        if ( event.getAction() != Action.RIGHT_CLICK_BLOCK )
            return;

        Block block = event.getClickedBlock();

        if ( block.getType() == Material.WALL_SIGN ) {
            // Other tests to make sure its the right sign
            startTagController( event.getPlayer() );
        }
    }


    /**
     * Trigger the start of a player's conversation. This would be called by your sign
     * interaction handler or started by a command.
     * 
     * @param player player for which conversation is to be started
     */
    public void startTagController( Player player ) {
        if ( sessions.containsKey( player ) )
            return; // Already has a controller

        PlayerSession sess = new PlayerSession();
        sess.state = TagState.PREFIX;
        sessions.put( player, sess );
        promptPlayer( player );
    }


    /**
     * Display the appropriate prompt to the player depending on what state they are currently
     * in.
     * 
     * @param player player in conversation
     */
    private void promptPlayer( Player player ) {
        String prompt = null;
        switch ( sessions.get( player ).state ) {
            case PREFIX:
                prompt = "Enter a prefix (enter 'clear' to quit)";
                break;
            case BRACKET:
                prompt = "Enter a bracket color";
                break;
            case NAME:
                prompt = "Enter a name color";
                break;
            default:
                cleanup( player );
                player.sendMessage( "Sorry some bad has happened, exiting tag manager" );
                throw new IllegalStateException( "Unknown tag state" );
        }

        player.sendMessage( prompt );
    }


    /**
     * Process chat response. Evaluate message and determine next valid state. If next state
     * is anything other than DONE, set player's current state to it and prompt them. This will
     * also reprompt player should they enter an invalid value.
     * 
     * @param player player responding
     * @param msg response message
     */
    private void processResponse( Player player, String msg ) {
        PlayerSession sess = sessions.get( player );
        sess.state = evaluateState( player, sess, msg );

        if ( sess.state == TagState.DONE || sess.state == TagState.ERR )
            cleanup( player );
        else
            promptPlayer( player );
    }


    /**
     * Evaluate the given message according to the current state.
     * 
     * @param player player in conversation
     * @param state current player state
     * @param msg response message to evaluate
     * @return next valid state; same state if invalidation errors; or ERR if terminal error.
     */
    private TagState evaluateState( Player player, PlayerSession sess, String msg ) {
        if ( "clear".equalsIgnoreCase( msg ) )
            return TagState.DONE;

        switch ( sess.state ) {
            case PREFIX:
                if ( validatePrefix( msg ) ) {
                    // Do something with valid prefix
                    sess.prefix = msg;
                    return TagState.BRACKET;
                }
                // Bark error at player, don't change state.
                return sess.state;

            case BRACKET:
                if ( validateColor( msg ) ) {
                    // Do something with valid bracket color
                    sess.bracket = msg;
                    return TagState.NAME;
                }
                // Bark error at player, don't change state.
                return sess.state;

            case NAME:
                if ( validateColor( msg ) ) {
                    // Do something with valid name color
                    sess.name = msg;
                    return TagState.DONE;
                }
                // Bark error at player, don't change state.
                return sess.state;

            default:
                player.sendMessage( "Sorry some bad has happened, exiting tag manager" );
                return TagState.ERR;
        }
    }


    /**
     * Determine if the given prefix is valid.
     * 
     * @param prefix prefix to evaluate
     * @return true if valid; false otherwise.
     */
    private boolean validatePrefix( String prefix ) {
        // Check whether prefix is valid. Return true if it is and false if not
        return true;
    }


    /**
     * Determine if the given color key is valid.
     * 
     * @param color color key to evaluate
     * @return true if valid; false otherwise.
     */
    private boolean validateColor( String color ) {
        return color.matches( VALID_COLOR_PAT );
    }


    /**
     * Clean up after given player has completed or terminated conversation.
     * 
     * @param player conversation player
     */
    private void cleanup( Player player ) {
        PlayerSession sess = sessions.get( player );
        sessions.remove( player );

        if ( sess.state == TagState.DONE ) {
            player.sendMessage( "Prefix selected: " + sess.prefix );
            player.sendMessage( "Bracket color selected: " + sess.bracket );
            player.sendMessage( "Name color selected: " + sess.name );
        }
    }

    protected class PlayerSession {
        public TagState state;
        public String   prefix;
        public String   bracket;
        public String   name;
    }
}

Bukkit 对话

Bukkit 的一个罕见功能，除非有人指出或仔细阅读 Bukkit 的内容，否则很多人都不会发现源代码是其 org.bukkit.conversations.ConversationFactory 资源。它是一个框架，专门用于您想要实现的目标。它有几个好处

• 无需自定义控制逻辑。对话可以支持大多数类型的有向图，例如作为状态机。
• 无需维护播放器存储空间。对话为每个玩家提供 session 存储。
• 默认情况下对话是模态的。所有发送给玩家的正常消息都会被抑制。对话也可以是非模式的，允许正常的消息流动。
• 动态提示生成，可以更好地表示对话的状态。
• 无需跟踪。对话可能会在一段时间后超时。
• 不提供家政服务。如果玩家注销，对话就会自行释放。

Note the use of sendRawMessage() during the conversation, as it does not check conversation state as sendMessage() does.

以下代码是使用Conversations的实现。再次强调，此代码用于教育和演示目的。使用风险由您自行承担。

public class ConvoTagController implements Listener {
    private static final String       VALID_COLOR_PAT = "^[a-f0-9]$";
    private final ConversationFactory factory;


    public ConvoTagController( JavaPlugin plugin ) {
        this.factory = new ConversationFactory( plugin );
        Bukkit.getPluginManager().registerEvents( this, plugin );
    }


    @EventHandler( ignoreCancelled = true )
    public void onPlayerInteract( PlayerInteractEvent event ) {
        if ( event.getAction() != Action.RIGHT_CLICK_BLOCK )
            return;

        Block block = event.getClickedBlock();

        Player player = event.getPlayer();
        if ( block.getType() == Material.WALL_SIGN ) {
            // Other tests to make sure its the right sign
            if ( !player.isConversing() )
                startConversation( player );
        }
    }


    /**
     * Trigger the start of a player's conversation. This would be called by your sign
     * interaction handler or started by a command.
     * 
     * @param player player for which conversation is to be started
     */
    private void startConversation( Player player ) {
        factory.withFirstPrompt( new PrefixPrompt() ).withPrefix( new TagPrefix() )
                .withLocalEcho( false ).withEscapeSequence( "clear" ).buildConversation( player )
                .begin();
    }

    public class TagPrefix implements ConversationPrefix {

        @Override
        public String getPrefix( ConversationContext context ) {
            return ChatColor.BLUE + "[TAGS] " + ChatColor.WHITE;
        }

    }

    public class PrefixPrompt extends ValidatingPrompt {

        @Override
        public String getPromptText( ConversationContext context ) {
            return "Enter a prefix (type 'clear' to quit)";
        }


        @Override
        protected boolean isInputValid( ConversationContext context, String input ) {
            // TODO Test to make sure prefix is valid
            return true;
        }


        @Override
        protected Prompt acceptValidatedInput( ConversationContext context, String input ) {
            context.setSessionData( "prefix", input );
            return new BracketColor();
        }
    }

    public class BracketColor extends ValidatingPrompt {

        @Override
        public String getPromptText( ConversationContext context ) {
            return "Enter a bracket color (type 'clear' to quit)";
        }


        @Override
        protected boolean isInputValid( ConversationContext context, String input ) {
            return input.matches( VALID_COLOR_PAT );
        }


        @Override
        protected Prompt acceptValidatedInput( ConversationContext context, String input ) {
            context.setSessionData( "bracket", input );
            return new NameColor();
        }

    }

    public class NameColor extends ValidatingPrompt {

        @Override
        public String getPromptText( ConversationContext context ) {
            return "Enter a name color (type 'clear' to quit)";
        }


        @Override
        protected boolean isInputValid( ConversationContext context, String input ) {
            return input.matches( VALID_COLOR_PAT );
        }


        @Override
        protected Prompt acceptValidatedInput( ConversationContext context, String input ) {
            context.setSessionData( "name", input );
            return new Done();
        }
    }

    public class Done implements Prompt {

        @Override
        public String getPromptText( ConversationContext context ) {
            Conversable c = context.getForWhom();
            String prefix = (String) context.getSessionData( "prefix" );
            String bracket = (String) context.getSessionData( "bracket" );
            String name = (String) context.getSessionData( "name" );

            c.sendRawMessage( "Prefix selected: " + prefix );
            c.sendRawMessage( "Bracket color selected: " + bracket );
            c.sendRawMessage( "Name color selected: " + name );

            if ( c instanceof Player ) {
                Player p = (Player) c;
                // Do whatever you need to do to player specifically.
            }
            return "Thank you, your settings will now take effect";
        }


        @Override
        public boolean blocksForInput( ConversationContext context ) {
            return false;
        }


        @Override
        public Prompt acceptInput( ConversationContext context, String input ) {
            return END_OF_CONVERSATION;
        }
    }
}