利用Go语言搭建WebSocket服务端方法示例

脚本专栏 2024/5/3 佚名

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Go 搭建一个简单 WebSocket 服务端代码例子 test.go, 如下：

package main
 
import (
 "fmt"
 "log"
 "net/http"
 
 "golang.org/x/net/websocket"
)
 
func Echo(ws *websocket.Conn) {
 var err error
 
 for {
 var reply string
 
 if err = websocket.Message.Receive(ws, &reply); err != nil {
 fmt.Println("Can't receive")
 break
 }
 
 fmt.Println("Received back from client: " + reply)
 
 msg := "Received: " + reply
 fmt.Println("Sending to client: " + msg)
 
 if err = websocket.Message.Send(ws, msg); err != nil {
 fmt.Println("Can't send")
 break
 }
 }
}
 
func main() {
 http.Handle("/", websocket.Handler(Echo))
 
 if err := http.ListenAndServe(":1234", nil); err != nil {
 log.Fatal("ListenAndServe:", err)
 }
}

运行服务端：

go run test.go

在 Firefox 或 Chrome 控制台，可以用以下代码发起客户端的 WebSocket 连接：

var wsServer = 'ws://localhost:1234';
var websocket = new WebSocket(wsServer);
websocket.onopen = function (evt) {
 console.log("Connected to WebSocket server.");
};
 
websocket.onclose = function (evt) {
 console.log("Disconnected");
};
 
websocket.onmessage = function (evt) {
 console.log('Retrieved data from server: ' + evt.data);
};
 
websocket.onerror = function (evt, e) {
 console.log('Error occured: ' + evt.data);
};

执行以上代码，得到输出日志：Connected to WebSocket server，表示 WebSocket 连接建立成功。

使用如下代码可以发送数据，如：