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Home Backend Development PHP Tutorial Practical application of WebSocket and long polling technology in online games

Practical application of WebSocket and long polling technology in online games

Oct 15, 2023 pm 01:34 PM
websocket online game long polling technology

Practical application of WebSocket and long polling technology in online games

Practical application of WebSocket and long polling technology in online games

Introduction:
The real-time requirements of online games are very high, and the interaction between players Quick response is required. To achieve this real-time nature, developers often use WebSocket and long polling to achieve instant communication. In this article, we will discuss the practical application of WebSocket and long polling technology in online games and give specific code examples.

1. Application of WebSocket technology
WebSocket is a communication protocol in HTML5. It provides a full-duplex communication mechanism, allowing the server to actively push data to the client, and the client can also Send data to the server. In online games, WebSocket technology is used for real-time interaction and updating game status.

  1. Server-side code example: 

    // 引入WebSocket庫(kù)
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;

// 聲明WebSocket端點(diǎn)
@ServerEndpoint("/game")
public class GameEndpoint {
 // 當(dāng)有連接建立時(shí)觸發(fā)
 @OnOpen
 public void onOpen(Session session) {
     // 將連接加入游戲房間
     GameRoom.join(session);
 }
  
 // 當(dāng)收到消息時(shí)觸發(fā)
 @OnMessage
 public void onMessage(String message, Session session) {
     // 處理游戲邏輯，更新游戲狀態(tài)
     GameRoom.processMessage(message, session);
 }
  
 // 當(dāng)連接關(guān)閉時(shí)觸發(fā)
 @OnClose
 public void onClose(Session session) {
     // 將連接從游戲房間中移除
     GameRoom.leave(session);
 }
  
 // 當(dāng)錯(cuò)誤發(fā)生時(shí)觸發(fā)
 @OnError
 public void onError(Throwable error) {
     // 處理錯(cuò)誤信息
     System.out.println("Error occurred: " + error.getMessage());
 }
}

  2. Client-side code example: 

    // 連接WebSocket服務(wù)器
var socket = new WebSocket("ws://localhost:8080/game");

// 當(dāng)連接建立時(shí)觸發(fā)
socket.onopen = function() {
 console.log("Connected to the server");
};

// 當(dāng)收到消息時(shí)觸發(fā)
socket.onmessage = function(event) {
 var message = event.data;
 // 處理接收到的游戲狀態(tài)更新
 handleGameUpdate(message);
};

// 當(dāng)連接關(guān)閉時(shí)觸發(fā)
socket.onclose = function() {
 console.log("Disconnected from the server");
};

// 當(dāng)發(fā)生錯(cuò)誤時(shí)觸發(fā)
socket.onerror = function(error) {
 console.log("Error occurred: " + error);
};

// 發(fā)送消息給服務(wù)器
function sendMessage(message) {
 socket.send(message);
}

2. Application of long polling technology
Long polling is a technology for communication between the browser and the server. It achieves real-time communication by continuously sending requests and waiting for responses. In online games, long polling technology is used to send requests to the server to get the latest game status.

  1. Server-side code example: 

    // 處理長(zhǎng)輪詢請(qǐng)求的控制器
@Controller
@RequestMapping("/game")
public class GameController {
 @RequestMapping("/status")
 @ResponseBody
 public ResponseEntity<String> getStatus() {
     // 檢查游戲狀態(tài)的更新
     String status = GameStatusChecker.check();
     
     // 返回最新的游戲狀態(tài)
     return new ResponseEntity<>(status, HttpStatus.OK);
 }
}

  2. Client-side code example: 

    // 定時(shí)發(fā)送請(qǐng)求以獲取游戲狀態(tài)
function pollGameStatus() {
 $.ajax({
     url: "/game/status",
     type: "GET",
     dataType: "json",
     success: function(response) {
         // 處理接收到的游戲狀態(tài)更新
         handleGameUpdate(response);
     },
     complete: function() {
         // 定時(shí)發(fā)送請(qǐng)求
         setTimeout(pollGameStatus, 1000);
     }
 });
}

// 頁(yè)面加載完成后開始長(zhǎng)輪詢
$(document).ready(function() {
 pollGameStatus();
});

Conclusion:
In online games, WebSocket and long polling are both commonly used real-time communication technologies. WebSocket provides a full-duplex communication mechanism, suitable for real-time interaction and game status updates. Long polling obtains the latest game status by sending requests regularly and waiting for responses. Developers can choose the appropriate communication technology based on specific needs to achieve real-time interaction in online games. The code examples provided above can be used as a reference to help developers quickly implement the application of these technologies.

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