所以我要做的是使用bukkit和hashmap来保存玩家的名字和他们的家乡位置，以便能够传送到以后。目前User._PlayerHomes散列图可以工作，但是一旦服务器关闭并重新加载，就没有名为User.ser的文件，如果你试图传送到你之前设置的家，那么我将发布一条冗长的错误消息这里。
[13:20:05 INFO]: Kalenpw issued server command: /khome
[13:20:05 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'khome' in plugin TestPlugin v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:645) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1350) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1185) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_85]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_85]
at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_85]
Caused by: java.lang.NullPointerException
at org.bukkit.craftbukkit.v1_9_R1.entity.CraftPlayer.teleport(CraftPlayer.java:457) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at org.bukkit.craftbukkit.v1_9_R1.entity.CraftEntity.teleport(CraftEntity.java:225) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
at com.Khalidor.testplugin.TestPluginCommandExecutor.onCommand(TestPluginCommandExecutor.java:161) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.9.2.jar:git-Spigot-5a40365-b70058a]
... 15 more
以下是我遗漏了User.java类和plugin.yml的所有相关代码，因为这似乎不是问题，因为它一直有效，直到服务器重新启动但是如果这有助于让我知道并且我'我添加它：
TestPlugin.java：
//@kalenpw
package com.Khalidor.testplugin;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerLoginEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
public final class TestPlugin extends JavaPlugin implements Listener {
MyConfigManager manager;
MyConfig homesConfig;
@Override
public void onEnable() {
// TODO insert logic for when plugin is enabled
getLogger().info("onEable has been invoked!");
getServer().getPluginManager().registerEvents(this, this);
this.getCommand("KHome").setExecutor(new TestPluginCommandExecutor(this));
this.getCommand("KSetHome").setExecutor(new TestPluginCommandExecutor(this));
manager = new MyConfigManager(this);
homesConfig = manager.getNewConfig("Homes.yml");
//Deserialize
try{
FileInputStream fileIn = new FileInputStream("User.ser");
ObjectInputStream in = new ObjectInputStream(fileIn);
User._PlayerHomes = (HashMap<String, Location>) in.readObject();
in.close();
fileIn.close();
}
catch(IOException i){
i.printStackTrace();
return;
}
catch(ClassNotFoundException c){
System.out.print("User class not found");
c.printStackTrace();
return;
}
}
@Override
public void onDisable() {
// when plugin is disabled
getLogger().info("onDisable has been invoked");
//Serialize object
try{
FileOutputStream fileOut = new FileOutputStream("User.ser");
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(User._PlayerHomes);
out.close();
fileOut.close();
System.out.println("Serialized data has been saved");
}
catch(IOException i){
i.printStackTrace();
}
}
}
TestPluginCommandExecutor.java
//@kalenpw
package com.Khalidor.testplugin;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Random;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import com.google.common.io.Files;
public class TestPluginCommandExecutor implements CommandExecutor {
private final TestPlugin plugin;
// All commands
private final String _KHome = "KHome";
private final String _KSetHome = "KSetHome";
ArrayList<String> _AllCommands = new ArrayList<String>();
// Error Messages
private final String _InvalidArguments = ChatColor.RED + "Error(00): Invalid argument!";
private final String _InvalidExecutor = ChatColor.RED + "Error(01): Can't execute command";
//public static HashMap<String, Location> playerHomes = new HashMap<String, Location>();
public TestPluginCommandExecutor(TestPlugin plugin) {
this.plugin = plugin;// store info
}
@Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
if (cmd.getName().equalsIgnoreCase(_KHome)) {
if (sender instanceof Player) {
Player player = (Player) sender;
//Location homeLocation = playerHomes.get(player.getName());
Location homeLocation = User._PlayerHomes.get(player.getName());
player.teleport(homeLocation);
player.sendMessage("You were teleported home!");
return true;
}
}
if (cmd.getName().equalsIgnoreCase(_KSetHome)) {
if (sender instanceof Player) {
Player player = (Player) sender;
//playerHomes.put(player.getName(), player.getLocation());
//homesConfig.
player.sendMessage("Set your home!");
User._PlayerHomes.put(player.getName(), player.getLocation());
// //Save home to file
// Path playerHomesFile = Paths.get("PlayerHomes.txt");
// String playerName = player.getName();
// String playerX = String.valueOf(player.getLocation().getX());
// String playerY = String.valueOf(player.getLocation().getY());
// String playerZ = String.valueOf(player.getLocation().getZ());
//
//
// //List<String> playerInfo = Arrays.asList(playerName, playerX, playerY, playerZ);
// ArrayList<String> playerInfo = new ArrayList<String>();
// playerInfo.add(playerName);
//
//
// //Files.write(playerHomesFile, playerInfo, Charset.forName("UTF-8"));
// //Files.write(playerHomesFile, playerInfo, Charset.forName("UTF-8"), StandardOpenOption.APPEND);
return true;
}
}
sender.sendMessage(_InvalidExecutor);
return false;
}
}
感谢您的帮助！我想我已经包含了所有相关细节，但如果遗漏了任何内容或需要澄清，请告诉我，我会进行编辑。
编辑：尝试对位置进行血清化时的例外情况：
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
[14:13:20 WARN]: at java.util.HashMap.writeObject(HashMap.java:1129)
[14:13:20 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[14:13:20 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[14:13:20 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[14:13:20 WARN]: at java.lang.reflect.Method.invoke(Method.java:606)
[14:13:20 WARN]: at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1030)
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1495)
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431)
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177)
[14:13:20 WARN]: at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
[14:13:20 WARN]: at com.Khalidor.testplugin.TestPlugin.onDisable(TestPlugin.java:90)
[14:13:20 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:294)
[14:13:20 WARN]: at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:364)
[14:13:20 WARN]: at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:424)
[14:13:20 WARN]: at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:417)
[14:13:20 WARN]: at org.bukkit.craftbukkit.v1_9_R1.CraftServer.disablePlugins(CraftServer.java:340)
[14:13:20 WARN]: at net.minecraft.server.v1_9_R1.MinecraftServer.stop(MinecraftServer.java:454)
[14:13:20 WARN]: at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:595)
[14:13:20 WARN]: at java.lang.Thread.run(Thread.java:745)
答案 0 :(得分：1)
类位置不是Serializable，因此您不能简单地将其转储到文件中（因为您自己已经找到here）
你的选择是使位置可序列化（如果可以，它是有意义的。我不知道这个API），或序列化 可序列化的其他东西，然后读取的东西否则将该信息转换为位置。