golang WebSocket與行動裝置應用的整合：建構跨平台通訊系統

package main

import (
    "log"
    "net/http"
    "github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
    CheckOrigin: func(r *http.Request) bool {
        return true
    },
}

func handleWebSocket(w http.ResponseWriter, r *http.Request) {
    conn, err := upgrader.Upgrade(w, r, nil)
    if err != nil {
        log.Println(err)
        return
    }

    for {
        // 从客户端读取消息
        _, message, err := conn.ReadMessage()
        if err != nil {
            log.Println(err)
            return
        }

        // 处理消息
        log.Println(string(message))

        // 向客户端发送消息
        err = conn.WriteMessage(websocket.TextMessage, []byte("Hello from server"))
        if err != nil {
            log.Println(err)
            return
        }
    }
}

func main() {
    http.HandleFunc("/ws", handleWebSocket)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

import React, { useEffect, useState } from "react";
import { View, Text } from "react-native";
import { w3cwebsocket as W3CWebSocket } from "websocket";

const ws = new W3CWebSocket("ws://localhost:8080/ws");

const App = () => {
  const [message, setMessage] = useState("");

  useEffect(() => {
    ws.onopen = () => {
      console.log("WebSocket connected");
    };

    ws.onmessage = (event) => {
      setMessage(event.data);
    };

    ws.onclose = () => {
      console.log("WebSocket disconnected");
    };
  }, []);

  return (
    <View>
      <Text>{message}</Text>
    </View>
  );
};

export default App;