java - Bukkit/Spigot - EntityDamageByEntityEvent : cast the shooter

Question

我正在创建一个 PvP 插件，但我无法继续，因为我有一个无法解决的恼人的 Actor 问题。我正在尝试获取最后一个伤害原因，即伤害者，检查伤害者是否使用了箭头，将“箭头”转换为<射手。但它不断地在我的控制台中给出错误。

这是我的代码

Player player = (Player)event.getPlayer(); // this variable is in my public void onPlayerMovement event
if(((EntityDamageByEntityEvent) player.getLastDamageCause()).getDamager() instanceof Arrow) 
{
   Arrow arrow = (Arrow) ((EntityDamageByEntityEvent) player.getLastDamageCause()).getDamager();
   ProjectileSource shooter = ((ProjectileSource) ((EntityDamageByEntityEvent) player.getLastDamageCause()).getDamager());

   if(shooter instanceof Player) // checking if the shooter is a player.
   {
      shooter.sendMessage("You hitted someone with a bow right?");
      player.sendMessage("You got hit by a bow..");
   }
}

我想将箭头转换为射手的原因是因为我想向射手显示一条消息，以及其他一些东西。

这是错误

[22:39:10 ERROR]: Could not pass event PlayerMoveEvent to FendykPVP v1.8
    org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:270) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.PacketPlayInFlying.a(SourceFile:126) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.PacketPlayInFlying$PacketPlayInPosition.a(SourceFile:57) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_8_R3.entity.CraftArrow cannot be cast to org.bukkit.entity.Player
    at GameCore.playerKill.onPlayerMovement(playerKill.java:102) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor1391.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_121]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
    ... 15 more

我希望有人能帮我解决这个问题

Answer 1

这可能有效，也可能无效，我自己还没有测试过。但在转换之前你需要检查它是否是箭头。另外，为了获取射手，射弹类中还有箭头可以使用的方法 arrow.getShooter() 。

if(((EntityDamageByEntityEvent) player.getLastDamageCause()).getDamager() instanceof Arrow) {
    Arrow arrow = (Arrow) ((EntityDamageByEntityEvent) player.getLastDamageCause()).getDamager();
    ProjectileSource shooter = arrow.getShooter();

       if(shooter instanceof Player) // checking if the shooter is a player.
       {
          Player shooterPlayer = (Player) shooter;
          shooterPlayer.sendMessage("You hitted someone with a bow right?");
          player.sendMessage("You got hit by a bow..");
       }
}

如果没有帮助，请告诉我第 102 行是什么。