Golang实现WebSocket通信详解

go get github.com/gorilla/websocket

package main

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

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

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

    for {
        // 读取消息
        messageType, message, err := conn.ReadMessage()
        if err != nil {
            log.Println("读取失败:", err)
            break
        }

        // 回显消息
        log.Printf("收到: %s", message)
        if err := conn.WriteMessage(messageType, message); err != nil {
            log.Println("发送失败:", err)
            break
        }
    }
}

func main() {
    http.HandleFunc("/ws", handleWebSocket)
    log.Println("服务器启动在 :8080")
    log.Fatal(http.ListenAndServe(":8080", nil))
}

package main

import (
    "log"
    "net/url"
    "os"
    "os/signal"
    "github.com/gorilla/websocket"
)

func main() {
    u := url.URL{Scheme: "ws", Host: "localhost:8080", Path: "/ws"}
    log.Printf("连接到 %s", u.String())

    conn, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
    if err != nil {
        log.Fatal("连接失败:", err)
    }
    defer conn.Close()

    done := make(chan struct{})

    // 读取协程
    go func() {
        defer close(done)
        for {
            _, message, err := conn.ReadMessage()
            if err != nil {
                log.Println("读取错误:", err)
                return
            }
            log.Printf("收到: %s", message)
        }
    }()

    // 发送消息
    ticker := time.NewTicker(time.Second)
    defer ticker.Stop()

    sig := make(chan os.Signal, 1)
    signal.Notify(sig, os.Interrupt)

    for {
        select {
        case