Minecraft 每个配置一个玩家

Question

我将尝试快速完成此操作，基本上我正在尝试为每个玩家制作一个配置。

所以基本上每当我调用 user.CreateUser();如果用户不存在，它会在那里注册自己的配置，并将唯一 ID 作为 yml

的名称

我的问题是每当我尝试调用 user.CreateUser();在 PlayerJoinEvent 上显示错误，我不确定 UUID u 不应该返回 null，因为它在构造函数或其他变量中。

错误

[23:57:52 ERROR]: Could not pass event PlayerJoinEvent to MCEnhanced v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader.execute(JavaPluginLoader.ja
va:310) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:502) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:487) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:
296) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:156) [spigo
t-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144)
[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [
spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231
) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java
:148) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:8
17) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
67) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
57) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:560) [spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
        at crypted.mcenhanced.Handlers.UserDataHandler.CreateUser(UserDataHandle
r.java:46) ~[?:?]
        at crypted.mcenhanced.Mechanics.ConfigMechanics.CreateUser.CreateUser(Cr
eateUser.java:19) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_45]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_45]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_45]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_45]
        at org.bukkit.plugin.java.JavaPluginLoader.execute(JavaPluginLoader.ja
va:306) ~[spigot-1.8.7-R0.1-SNAPSHOT-latest.jar:git-Spigot-f928e7a-e91aed8]
        ... 14 more

创建用户监听器Class

public class CreateUser implements Listener {

@EventHandler
public void CreateUser(PlayerJoinEvent event){
    Player player = event.getPlayer();
    UserDataHandler user = new UserDataHandler(player.getUniqueId());
    user.CreateUser();

}
}

UserDataHandler Class

import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.event.Listener;

import java.io.File;
import java.util.UUID;

public class UserDataHandler implements Listener {


     UUID u;
     File UserFile;
     FileConfiguration UserConfig;

    //UserDataHandler user = new UserDataHandler(player.getUniqueId()); // Make sure that you have the player.getUniqueId()

    public UserDataHandler(UUID u){

        this.u = u;

        File UserFile = new File("plugins/MCEnhanced/data/" + u + ".yml");

        YamlConfiguration UserConfig = YamlConfiguration.loadConfiguration(UserFile);

    }

    public void CreateUser(){

        if ( !(UserFile.exists()) ) {
            try {

                //Bukkit.getConsoleSender().sendMessage(ChatColor.YELLOW + "[MCEnhanced] Created a new File for " + player.getName() + "(" + player.getUniqueId() + ")");

                YamlConfiguration UserConfig = YamlConfiguration.loadConfiguration(UserFile);

                UserConfig.save(UserFile);


            } catch (Exception e) {

                e.printStackTrace();

               // Bukkit.getConsoleSender().sendMessage(ChatColor.RED + "[MCEnhanced] Could not create a new File for " + player.getName() + "(" + player.getUniqueId() + ")");

                //u.kickPlayer(ChatColor.RED + "We could not create a file for your account!"); // THE PLAYERS CONFIG NEEDS TO BE CREATED!!!!!!!!

            }
        }

    }


    public FileConfiguration getUserFile(){

        return UserConfig;

    }

    public void setDefaultUserFile(){

        getUserFile().set("MCEnhanced.Info.IsInfected", false);

    }

    public void saveUserFile(){

        try {

            getUserFile().save(UserFile);

        } catch(Exception e) {

            e.printStackTrace();

        }

    }





}

Answer 1

在CreateUser方法中，你引用了UserFile字段或者当前UserDataHandler对象的实例变量，默认是无效的。 UserDataHandler class 的构造函数不会实例化此 UserFile 字段，而是在该构造函数中创建一个本地 File 变量，然后永远不会使用该变量。该行...

File UserFile = new File("plugins/MCEnhanced/data/" + u + ".yml");

应该...

UserFile = new File("plugins/MCEnhanced/data/" + u + ".yml");

以便为该实例实例化 File 字段。

我建议您也使用 lowerCamelCase 命名约定来命名您的变量、字段和方法。

Minecraft 每个配置一个玩家

Minecraft One Player Per Config

java

bukkit