如何从.yml文件正确加载HashMap？

Z时代
2024-01-10
分类：问答

我正在尝试使用标准Bukkit配置文件API从配置文件加载HashMap。如何从.yml文件正确加载HashMap？

的HashMap：

public static HashMap<String, String> banned = new HashMap<String, String>();

这是我试图获取数据的方式：

public static boolean isBanned(String uuid) { 
    if (Dogends.config.getConfigurationSection("Banned").getKeys(true).contains(uuid)) { 
     return true; 
    } 
    return false; 
}

如果玩家被禁止，然后它的确定，但是当玩家没有被禁止，则它抛出一个NullPointerException。

NullPointerException异常：

Could not pass event PlayerLoginEvent to Dogends v1.0 
org.bukkit.event.EventException 
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[cb.jar:git-Bukkit-880a532] 
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[cb.jar:git-Bukkit-880a532] 
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [cb.jar:git-Bukkit-880a532] 
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.PlayerList.attemptLogin(PlayerList.java:439) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:89) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:53) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:222) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.ServerConnection.c(SourceFile:168) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:744) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:628) [cb.jar:git-Bukkit-880a532] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:536) [cb.jar:git-Bukkit-880a532] 
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_91] 
Caused by: java.lang.NullPointerException 
    at me.woulfiee.server.ban.BanCommand.isBanned(BanCommand.java:47) ~[?:?] 
    at me.woulfiee.server.ban.BanCommand.onPlayerLogin(BanCommand.java:103) ~[?:?] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] 
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] 
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[cb.jar:git-Bukkit-880a532] 
    ... 13 more

config.yml：

Ranks: 
    Player: 
    Players: [] 
    Mythic: 
    Players: [] 
    Doge: 
    Players: [] 
    Youtuber: 
    Players: [] 
    Builder: 
    Players: [] 
    Mod: 
    Players: [] 
    Admin: 
    Players: [] 
    Owner: 
    Players: 
     - d166739c-32d3-4b37-a1be-883be57d736c 
Broadcast: 
    Interval: 120 
Banned: 
    d166739c-32d3-4b37-a1be-883be57d736c: "CONSOLE \xa7eHELP"

回答：

为了实现你的愿望，你应该尝试以下操作：

确保你的配置不为空/存在

布尔isBanned（字符串UUID）{

FileConfiguration yourConfig; 
//Getting the Banned section 
ConfigurationSection banned = yourConfig.getConfigurationSection("Banned"); 
//All the keys inside the banned configuration section 
Set<String> keys = banned.getKeys(false); //We don't want it to be deep 
if (keys.contains(uuid))return true; //UUID is on the keys list, so the player is banned 
return false; //UUID is not on the keys list, so the player is not banned

}

我不相信你真的需要HashMap的，除非你使用它别的东西