golang WebSocket与JSON的结合：实现数据传输和解析

go get github.com/gorilla/websocket

package main

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

type Message struct {
    Content string `json:"content"`
}

var upgrader = websocket.Upgrader{
    ReadBufferSize:  1024,
    WriteBufferSize: 1024,
}

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

    for {
        // 读取客户端发送的消息
        _, message, err := conn.ReadMessage()
        if err != nil {
            log.Println(err)
            break
        }

        // 解析JSON数据
        var msg Message
        err = json.Unmarshal(message, &msg)
        if err != nil {
            log.Println(err)
            break
        }

        // 输出收到的消息
        fmt.Println("收到消息:", msg.Content)

        // 发送响应消息
        response := Message{
            Content: "你发送的消息是：" + msg.Content,
        }

        // 将响应转换为JSON格式
        jsonResponse, err := json.Marshal(response)
        if err != nil {
            log.Println(err)
            break
        }

        // 发送JSON响应
        err = conn.WriteMessage(websocket.TextMessage, jsonResponse)
        if err != nil {
            log.Println(err)
            break
        }
    }
}

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

var socket = new WebSocket("ws://localhost:8080/ws");
socket.onopen = function () {
    console.log('连接已打开');
    var message = {
        content: 'Hello Server!'
    };
    socket.send(JSON.stringify(message));
};
socket.onmessage = function (event) {
    console.log('收到服务器的响应：', JSON.parse(event.data));
    socket.close();
};
socket.onclose = function () {
    console.log('连接已关闭');
};