史诗级大饼，请叫我黑饼王。

src/main/java/me/skymc/taboolib/socket/packet/Packet.java

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+package me.skymc.taboolib.socket.packet;
+
+import com.google.gson.JsonObject;
+
+import java.util.UUID;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:01
+ */
+public abstract class Packet {
+
+    private final int port;
+    private final String uid;
+
+    public Packet(int port) {
+        this.port = port;
+        this.uid = UUID.randomUUID().toString();
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public String getUid() {
+        return uid;
+    }
+
+    public void readOnServer() {
+
+    }
+
+    public void readOnClient() {
+
+    }
+
+    public void serialize(JsonObject json) {
+
+    }
+
+    public void unSerialize(JsonObject json) {
+
+    }
+
+}

src/main/java/me/skymc/taboolib/socket/packet/PacketSerializer.java

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+package me.skymc.taboolib.socket.packet;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
+import me.skymc.taboolib.socket.packet.impl.PacketEmpty;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:32
+ */
+public class PacketSerializer {
+
+    private static PacketParser parser = new PacketParser();
+
+    public static String serialize(Packet packet) {
+        JsonObject json = new JsonObject();
+        json.addProperty("uid", packet.getUid());
+        json.addProperty("port", packet.getPort());
+        json.addProperty("packet", packet.getClass().getAnnotation(PacketType.class).name());
+        packet.serialize(json);
+        return json.toString();
+    }
+
+    public static Packet unSerialize(String origin) {
+        Packet packet = null;
+        try {
+            packet = parser.parser((JsonObject) new JsonParser().parse(origin));
+        } catch (JsonSyntaxException e) {
+            e.printStackTrace();
+        }
+        return packet == null ? new PacketEmpty(0) : packet;
+    }
+
+    // *********************************
+    //
+    //        Getter and Setter
+    //
+    // *********************************
+
+    public static PacketParser getParser() {
+        return parser;
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/PacketType.java

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+package me.skymc.taboolib.socket.packet;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:09
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface PacketType {
+
+    String name();
+
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketAlive.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import me.skymc.taboolib.socket.TabooLibServer;
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:01
+ */
+@PacketType(name = "alive")
+public class PacketAlive extends Packet {
+
+    public PacketAlive(int port) {
+        super(port);
+    }
+
+    @Override
+    public void readOnServer() {
+        TabooLibServer.getConnection(getPort()).ifPresent(connect -> connect.getValue().setLatestResponse(System.currentTimeMillis()));
+    }
+
+    @Override
+    public void readOnClient() {
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketEmpty.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:01
+ */
+@PacketType(name = "empty")
+public class PacketEmpty extends Packet {
+
+    public PacketEmpty(int port) {
+        super(port);
+    }
+
+    @Override
+    public void readOnServer() {
+    }
+
+    @Override
+    public void readOnClient() {
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketHeartbeat.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import me.skymc.taboolib.socket.TabooLibClient;
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:01
+ */
+@PacketType(name = "heartbeat")
+public class PacketHeartbeat extends Packet {
+
+    public PacketHeartbeat(int port) {
+        super(port);
+    }
+
+    @Override
+    public void readOnServer() {
+    }
+
+    @Override
+    public void readOnClient() {
+        // 更新响应时间
+        TabooLibClient.setLatestResponse(System.currentTimeMillis());
+        // 回应服务端
+        TabooLibClient.sendPacket(new PacketAlive(TabooLibClient.getSocket().getLocalPort()));
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketJoin.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import com.ilummc.tlib.resources.TLocale;
+import me.skymc.taboolib.socket.TabooLibServer;
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:38
+ */
+@PacketType(name = "join")
+public class PacketJoin extends Packet {
+
+    public PacketJoin(int port) {
+        super(port);
+    }
+
+    @Override
+    public void readOnServer() {
+        TabooLibServer.println("Client " + getPort() + " joined Communication Area.");
+    }
+
+    @Override
+    public void readOnClient() {
+        TLocale.sendToConsole("COMMUNICATION.CLIENT-JOINED", String.valueOf(getPort()));
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketMessage.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import com.google.gson.JsonObject;
+import com.ilummc.tlib.resources.TLocale;
+import me.skymc.taboolib.socket.TabooLibServer;
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:01
+ */
+@PacketType(name = "message")
+public class PacketMessage extends Packet {
+
+    private String message;
+
+    public PacketMessage(int port) {
+        this(port, "none");
+    }
+
+    public PacketMessage(int port, String message) {
+        super(port);
+        this.message = message;
+    }
+
+    @Override
+    public void readOnServer() {
+        TabooLibServer.println(message);
+    }
+
+    @Override
+    public void readOnClient() {
+        TLocale.sendToConsole("COMMUNICATION.PACKET-MESSAGE", String.valueOf(getPort()), message);
+    }
+
+    @Override
+    public void serialize(JsonObject json) {
+        json.addProperty("message", message);
+    }
+
+    @Override
+    public void unSerialize(JsonObject json) {
+        message = json.get("message").getAsString();
+    }
+}

src/main/java/me/skymc/taboolib/socket/packet/impl/PacketQuit.java

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+package me.skymc.taboolib.socket.packet.impl;
+
+import com.google.gson.JsonObject;
+import com.ilummc.tlib.resources.TLocale;
+import me.skymc.taboolib.socket.TabooLibServer;
+import me.skymc.taboolib.socket.packet.Packet;
+import me.skymc.taboolib.socket.packet.PacketType;
+
+/**
+ * @Author sky
+ * @Since 2018-08-22 23:38
+ */
+@PacketType(name = "quit")
+public class PacketQuit extends Packet {
+
+    private String message;
+
+    public PacketQuit(int port) {
+        this(port, "connect closed.");
+    }
+
+    public PacketQuit(int port, String message) {
+        super(port);
+        this.message = message;
+    }
+
+    @Override
+    public void readOnServer() {
+        TabooLibServer.getConnection(getPort()).ifPresent(connection -> {
+            // 注销连接
+            TabooLibServer.getClient().remove(connection.getKey());
+            // 关闭连接
+            try {
+                connection.getValue().getSocket().close();
+            } catch (Exception ignored) {
+            }
+            // 提示信息
+            TabooLibServer.println("Client " + getPort() + " leaved Communication Area: " + message);
+        });
+    }
+
+    @Override
+    public void readOnClient() {
+        TLocale.sendToConsole("COMMUNICATION.CLIENT-QUITED", String.valueOf(getPort()));
+    }
+
+    @Override
+    public void serialize(JsonObject json) {
+        json.addProperty("message", message);
+    }
+
+    @Override
+    public void unSerialize(JsonObject json) {
+        message = json.get("message").getAsString();
+    }
+}