完成基本功能

src/main/java/cn/cnklp/studio/UnionBanClientSpigot/LogoutTask.java

@@ -0,0 +1,54 @@
+package cn.cnklp.studio.UnionBanClientSpigot;
+
+import org.bukkit.command.CommandSender;
+import org.bukkit.scheduler.BukkitRunnable;
+
+import javax.net.ssl.HttpsURLConnection;
+import java.net.URL;
+
+public class LogoutTask extends BukkitRunnable {
+    private final ClientPlugin plugin;
+    private final CommandSender sender;
+
+    public LogoutTask(ClientPlugin plugin, CommandSender sender) {
+        this.plugin = plugin;
+        this.sender = sender;
+    }
+
+    private static void Logout(String ServerAddress) throws Exception {
+        String Address = ServerAddress + "/session/";
+        URL url = new URL(Address);
+        HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
+        con.setReadTimeout(5000);
+        con.setConnectTimeout(5000);
+        con.setRequestProperty("User-Agent", "Mozilla/5.0");
+        con.setRequestProperty("Content-Type", "application/json");
+        con.setRequestMethod("DELETE");
+        con.setDoOutput(true);
+
+        con.connect();
+
+        int responseCode = con.getResponseCode();
+
+        if (responseCode != 204) {
+            con.disconnect();
+            throw new Exception("You have not logged in!");
+        }
+
+        con.disconnect();
+    }
+
+    @Override
+    public void run() {
+        try {
+            Logout(plugin.ServerAddress);
+            sender.sendMessage("Logged out successfully.");
+        } catch (Exception e) {
+            if (e.getMessage().equals("You have not logged in!")) {
+                sender.sendMessage("You have not logged in!");
+            } else {
+                sender.sendMessage("Cannot connect to UnionBan server!");
+            }
+        }
+    }
+}