html5使用go+websocket搭建websocket服务的实例
2020-11-27
来源：个人技术集锦
这次的就直接发放代码截图吧，应该是用go语言做后台一个简易的聊天，这里没用到什么特别的知识，最朴实的来实现效果，主要目的是分享下h5怎么用websocket，go搭建websocket服务的主要部分。
go代码部分：
// WebChat project main.go
package main
import (
"fmt"
"net/http"
"time"
"encoding/json"
"strings"
"golang.org/x/net/websocket"
)
//全局信息
var datas Datas
var users map[*websocket.Conn]string
func main() {
fmt.Println("启动时间")
fmt.Println(time.Now())
//初始化
datas = Datas{}
users = make(map[*websocket.Conn]string)
//绑定效果页面
http.HandleFunc("/", h_index)
//绑定socket方法
http.Handle("/webSocket", websocket.Handler(h_webSocket))
//开始监听
http.ListenAndServe(":8", nil)
}
func h_index(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "index.html")
}
func h_webSocket(ws *websocket.Conn) {
var userMsg UserMsg
var data string
for {
//判断是否重复连接
if _, ok := users[ws]; !ok {
users[ws] = "匿名"
}
userMsgsLen := len(datas.UserMsgs)
fmt.Println("UserMsgs", userMsgsLen, "users长度：", len(users))
//有消息时，全部分发送数据
if userMsgsLen > 0 {
b, errMarshl := json.Marshal(datas)
if errMarshl != nil {
fmt.Println("全局消息内容异常...")
break
}
for key, _ := range users {
errMarshl = websocket.Message.Send(key, string(b))
if errMarshl != nil {
//移除出错的链接
delete(users, key)
fmt.Println("发送出错...")
break
}
}
datas.UserMsgs = make([]UserMsg, 0)
}
fmt.Println("开始解析数据...")
err := websocket.Message.Receive(ws, &data)
fmt.Println("data：", data)
if err != nil {
//移除出错的链接
delete(users, ws)
fmt.Println("接收出错...")
break
}
data = strings.Replace(data, "\n", "", 0)
err = json.Unmarshal([]byte(data), &userMsg)
if err != nil {
fmt.Println("解析数据异常...")
break
}
fmt.Println("请求数据类型：", userMsg.DataType)
switch userMsg.DataType {
case "send":
//赋值对应的昵称到ws
if _, ok := users[ws]; ok {
users[ws] = userMsg.UserName
//清除连接人昵称信息
datas.UserDatas = make([]UserData, 0)
//重新加载当前在线连接人
for _, item := range users {
userData := UserData{UserName: item}
datas.UserDatas = append(datas.UserDatas, userData)
}
}
datas.UserMsgs = append(datas.UserMsgs, userMsg)
}
}
}
type UserMsg struct {
UserName string
Msg string
DataType string
}
type UserData struct {
UserName string
}
type Datas struct {
UserMsgs []UserMsg
UserDatas []UserData
}html代码部分：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<!-- 新 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
<!-- <script src="//cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>-->
</head>
<body>
<div>
<div>内容：</div>
<div id="divShow">
<!--<div class="list-group-item list-group-item-success">1111</div>
<div class="list-group-item list-group-item-info">1111</div>
<div class="list-group-item list-group-item-warning">1111</div>
<div class="list-group-item list-group-item-danger">1111</div>-->
</div>
<div id="divUsers">
在线：<br />
<!--<div class="btn btn-default">111</div>-->
</div>
<div>
昵称：<input id="txtUserName" value="红领巾" type="text" maxlength="20" style="width: 30%; margin-bottom: 15px" />
聊聊：<textarea id="txtContent" autofocus rows="6" placeholder="想聊的内容" maxlength="200" required style="width: 60%; "></textarea>
<button class="btn btn-default" id="btnSend" style="margin-top:15px">发 送</button>
</div>
</div>
</body>
</html>
<script>
var tool = function () {
var paperLoopNum = 0;
var paperTempleArr = [
'<div class="list-group-item list-group-item-success">{0}</div>',
'<div class="list-group-item list-group-item-info">{0}</div>',
'<div class="list-group-item list-group-item-warning">{0}</div>',
'<div class="list-group-item list-group-item-danger">{0}</div>'
];
return {
paperDiv: function (val) {
var hl = paperTempleArr[paperLoopNum];
paperLoopNum++;
if (paperLoopNum >= paperTempleArr.length) { paperLoopNum = 0; }
return this.formart(hl, [val])
},
formart: function (str, arrVal) {
for (var i = 0; i < arrVal.length; i++) {
str = str.replace("{" + i + "}", arrVal[i]);
}
return str;
}
}
}
function showMsg(id, hl, isAppend) {
if (!isAppend) { $("#" + id).html(hl); } else {
$("#" + id).append(hl);
}
}
$(function () {
//初始化工具方法
var tl = new tool();
var wsUrl = "ws://172.16.9.6:8/webSocket";
ws = new WebSocket(wsUrl);
try {
ws.onopen = function () {
//showMsg("divShow", tl.paperDiv("连接服务器-成功"));
}
ws.onclose = function () {
if (ws) {
ws.close();
ws = null;
}
showMsg("divShow", tl.paperDiv("连接服务器-关闭"), true);
}
ws.onmessage = function (result) {
//console.log(result.data);
var data = JSON.parse(result.data);
$(data.UserMsgs).each(function (i, item) {
showMsg("divShow", tl.paperDiv("【" + item.UserName + "】：" + item.Msg), true);
});
var userDataShow = [];
$(data.UserDatas).each(function (i, item) {
userDataShow.push('<div class="btn btn-default">' + item.UserName + '</div>');
});
showMsg("divUsers", userDataShow.join(''), false);
}
ws.onerror = function () {
if (ws) {
ws.close();
ws = null;
}
showMsg("divShow", tl.paperDiv("连接服务器-关闭"), true);
}
} catch (e) {
alert(e.message);
}
$("#btnSend").on("click", function () {
var tContentObj = $("#txtContent");
var tContent = $.trim( tContentObj.val()).replace("/[\n]/g", "");
var tUserName = $.trim( $("#txtUserName").val()); tUserName = tUserName.length <= 0 ? "匿名" : tUserName;
if (tContent.length <= 0 || $.trim(tContent).length <= 0) { alert("请输入发送内容!"); return; }
if (ws == null) { alert("连接失败，请F5刷新页面!"); return; }
var request = tl.formart('{"UserName": "{0}", "DataType": "{1}", "Msg": "{2}" }',
[tUserName, "send", tContent]);
ws.send(request);
tContentObj.val("");
tContentObj.val($.trim(tContentObj.val()).replace("/[\n]/g", ""));
});
$("#txtContent").on("keydown", function (event) {
if (event.keyCode == 13) {
$("#btnSend").trigger("click");
}
});
})
</script>效果图：
