完成PlayerExpSystem

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+.kotlin
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_24" default="true" project-jdk-name="24" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

pom.xml

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+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.mmlsystem</groupId>
+    <artifactId>PlayerExpSystem</artifactId>
+    <version>1.0.1</version>
+
+    <repositories>
+        <repository>
+            <id>central</id>
+            <url>https://repo.maven.apache.org/maven2/</url>
+        </repository>
+        <repository>
+            <id>spigot-repo</id>
+            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+        </repository>
+        <repository>
+            <id>jitpack-io</id>
+            <url>https://jitpack.io/</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot-api</artifactId>
+            <version>1.21.8-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.MilkBowl</groupId>
+            <artifactId>VaultAPI</artifactId>
+            <version>1.7</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>24.1.0</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/com/mmlsystem/PlayerExpSystem/Foundation.java

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+package com.mmlsystem.PlayerExpSystem;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.io.File;
+import java.sql.*;
+
+public class Foundation extends JavaPlugin {
+
+    private Connection connection;
+    private SaveManager manager;
+
+    @Override
+    public void onEnable() {
+        getLogger().info("世界上有10种人：");
+        getLogger().info("一种是了解三进制的");
+        getLogger().info("一种是不了解三进制的");
+        getLogger().info("还有一种是觉得这是个二进制笑话的");
+        setupDatabase();
+        PlayerJoinListener listener = new PlayerJoinListener(this);
+        manager = new SaveManager(this, listener);
+        Bukkit.getServer().getPluginManager().registerEvents(listener, this);
+        Bukkit.getScheduler().scheduleSyncRepeatingTask(this, () -> {
+            manager.saveAllPlayers();
+        }, 1200L, 1200L);
+        getLogger().info("插件启用成功。");
+    }
+
+    @Override
+    public void onDisable() {
+        closeDatabase();
+    }
+
+    public Connection getConnection() {
+        return connection;
+    }
+
+    public void setupDatabase() {
+        try {
+            File dbFile = new File(getDataFolder(), "players.db");
+            if (!dbFile.getParentFile().exists()) dbFile.getParentFile().mkdirs();
+
+            connection = DriverManager.getConnection("jdbc:sqlite:" + dbFile.getAbsolutePath());
+            Statement stmt = connection.createStatement();
+            stmt.executeUpdate("CREATE TABLE IF NOT EXISTS playtime (" +
+                    "uuid TEXT PRIMARY KEY, " +
+                    "name TEXT, " +
+                    "total BIGINT DEFAULT 0" +
+                    ")");
+            getLogger().info("初始化SQLite数据库成功。");
+        } catch (SQLException e) {
+            getLogger().severe(e.getMessage());
+            getLogger().severe("无法连接SQLite数据库！");
+            getServer().getPluginManager().disablePlugin(this);
+        }
+    }
+
+    private void closeDatabase() {
+        try {
+            if (connection != null && !connection.isClosed())
+                connection.close();
+        } catch (SQLException e) {
+            getLogger().severe(e.getMessage());
+        }
+        getLogger().info("插件禁用成功。");
+    }
+}

src/main/java/com/mmlsystem/PlayerExpSystem/PlayerJoinListener.java

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+package com.mmlsystem.PlayerExpSystem;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class PlayerJoinListener implements Listener {
+
+    private final Connection connection;
+    public final Map<UUID, Long> joinTimes = new HashMap<>();
+    private final Foundation plugin;
+
+    public PlayerJoinListener(Foundation plugin) {
+        this.connection = plugin.getConnection();
+        this.plugin = plugin;
+    }
+
+    @EventHandler
+    public void onJoin(PlayerJoinEvent e) {
+        joinTimes.put(e.getPlayer().getUniqueId(), System.currentTimeMillis());
+    }
+
+    @EventHandler
+    public void onQuit(PlayerQuitEvent e) {
+        Bukkit.getScheduler().runTaskAsynchronously(plugin, () -> {
+                savePlayer(e.getPlayer());
+        });
+        joinTimes.remove(e.getPlayer().getUniqueId());
+    }
+
+    public boolean savePlayer(Player player) {
+        long joinTime = joinTimes.getOrDefault(player.getUniqueId(), System.currentTimeMillis());
+        long session = System.currentTimeMillis() - joinTime;
+
+        try (PreparedStatement ps = connection.prepareStatement(
+                "INSERT INTO playtime (uuid, name, total) VALUES (?, ?, ?) " +
+                        "ON CONFLICT(uuid) DO UPDATE SET " +
+                        "name = excluded.name, total = total + excluded.total")) {
+            ps.setString(1, player.getUniqueId().toString());
+            ps.setString(2, player.getName());
+            ps.setLong(3, session);
+            ps.executeUpdate();
+            ps.close();
+            joinTimes.put(player.getUniqueId(), System.currentTimeMillis());
+            return true;
+        } catch (SQLException e) {
+            plugin.getLogger().severe(e.getMessage());
+            plugin.getLogger().severe("试图保存玩家" + player.getName() + "的在线时长时发生错误。");
+            return false;
+        }
+    }
+}

src/main/java/com/mmlsystem/PlayerExpSystem/SaveManager.java

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+package com.mmlsystem.PlayerExpSystem;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+
+public class SaveManager {
+    private final Foundation foundation;
+    private final PlayerJoinListener listener;
+
+    public SaveManager(Foundation foundation, PlayerJoinListener listener) {
+        this.foundation = foundation;
+        this.listener = listener;
+    }
+
+    public void saveAllPlayers() {
+        boolean isFail = false;
+        for (Player player : Bukkit.getOnlinePlayers()) {
+            if (!listener.savePlayer(player)) {
+                isFail = true;
+            }
+            listener.joinTimes.put(player.getUniqueId(), System.currentTimeMillis());
+        }
+        if (isFail) {
+            foundation.getLogger().warning("已完成自动保存例程，但发生了错误。");
+        }
+        else {
+            foundation.getLogger().info("已完成自动保存例程。");
+        }
+    }
+}

src/main/resources/plugin.yml

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+name: PlayerExpSystem
+main: com.mmlsystem.PlayerExpSystem.Foundation
+version: 1.0.1
+api-version: 1.21
+author: 杏川铭心
+description: 提供服务器计分板UI功能。