golang Websocket开发指南：实现实时数据可视化功能

package main

import (
    "fmt"
    "log"
    "net/Http"

    "GitHub.com/gorilla/websocket"
)

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

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

    for {
        // 接收消息
        messageType, p, err := conn.ReadMessage()
        if err != nil {
            log.Println(err)
            return
        }
        // 处理消息
        err = conn.WriteMessage(messageType, p)
        if err != nil {
            log.Println(err)
            return
        }
    }
}

func main() {
    http.HandleFunc("/ws", wsHandler)
    if err := http.ListenAndServe(":8080", nil); err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

var ws = new WebSocket("ws://localhost:8080/ws");
ws.onopen = function(event) {
    console.log("WebSocket opened");
};
ws.onmessage = function(event) {
    console.log("WebSocket message received", event.data);
};
ws.onclose = function(event) {
    console.log("WebSocket closed");
};

// 发送消息到服务器
ws.send("Hello, WebSocket!");

package main

import (
    "encoding/JSON"
    "log"
    "time"

    "github.com/gorilla/websocket"
)

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

type message struct {
    Time   time.Time `json:"time"`
    Data   float64   `json:"data"`
}

func main() {
    http.HandleFunc("/ws", wsHandler)
    if err := http.ListenAndServe(":8080", nil); err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

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

    for {
        // 接收消息
        messageType, p, err := conn.ReadMessage()
        if err != nil {
            log.Println(err)
            return
        }
        // 处理消息
        err = conn.WriteMessage(messageType, p)
        if err != nil {
            log.Println(err)
            return
        }
    }
}

func sendData() {
    //模拟数据源
    var data float64 = 0

    //循环发送数据
    for {
        value := message{
            Time:   time.Now(),
            Data:   data,
        }

        //将数据转换为json
        valueEncoded, err := json.Marshal(value)
        if err != nil {
            log.Println(err)
            continue
        }

        //将数据发送给WebSocket客户端
        for _, conn := range conns {
            err := conn.WriteMessage(websocket.TextMessage, valueEncoded)
            if err != nil {
                log.Println(err)
                continue
            }
        }

        //等待1秒钟，模拟数据源实时推送
        time.Sleep(1 * time.Second)

        //模拟数据源增加
        data += 0.1
    }
}

var ws = new WebSocket("ws://localhost:8080/ws");
ws.onopen = function(event) {
    console.log("WebSocket opened");
};
ws.onmessage = function(event) {
    var message = JSON.parse(event.data);
    console.log("WebSocket message received", message);
};
ws.onclose = function(event) {
    console.log("WebSocket closed");
};

//使用Chart.js绘制图表
var ctx = document.getElementById('myChart').getContext('2d');
var chart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: [],
        datasets: [{
            label: "My Dataset",
            data: [],
            fill: false,
            borderColor: "#ff0000",
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            xAxes: [{
                type: 'time',
                time: {
                    unit: 'second'
                }
            }]
        }
    }
});

//接收WebSocket数据，并在图表中实时更新
ws.onmessage = function(event) {
    var message = JSON.parse(event.data);
    chart.data.labels.push(message.time);
    chart.data.datasets[0].data.push(message.data);
    chart.update();
};