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81 lines
2.0 KiB
Markdown
81 lines
2.0 KiB
Markdown
# 15.11 与 websocket 通信
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备注：Go 团队决定从 Go 1 起，将 `websocket` 包移出 Go 标准库，转移到 `code.google.com/p/go` 下的子项目 `websocket`，同时预计近期将做重大更改。
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`import "websocket"` 这行要改成：
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```go
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import websocket "code.google.com/p/go/websocket"
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```
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与 http 协议相反，websocket 是通过客户端与服务器之间的对话，建立的基于单个持久连接的协议。然而在其他方面，其功能几乎与 http 相同。在示例 15.24 中，我们有一个典型的 websocket 服务器，他会自启动并监听 websocket 客户端的连入。示例 15.25 演示了 5 秒后会终止的客户端代码。当连接到来时，服务器先打印 `new connection`，当客户端停止时，服务器打印 `EOF => closing connection`。
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示例 15.24 [websocket_server.go](examples/chapter_15/websocket_server.go)
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```go
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package main
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import (
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"fmt"
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"net/http"
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"websocket"
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)
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func server(ws *websocket.Conn) {
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fmt.Printf("new connection\n")
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buf := make([]byte, 100)
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for {
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if _, err := ws.Read(buf); err != nil {
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fmt.Printf("%s", err.Error())
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break
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}
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}
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fmt.Printf(" => closing connection\n")
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ws.Close()
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}
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func main() {
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http.Handle("/websocket", websocket.Handler(server))
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err := http.ListenAndServe(":12345", nil)
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if err != nil {
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panic("ListenAndServe: " + err.Error())
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}
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}
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```
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示例 15.25 [websocket_client.go](examples/chapter_15/websocket_client.go)
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```go
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package main
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import (
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"fmt"
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"time"
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"websocket"
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)
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func main() {
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ws, err := websocket.Dial("ws://localhost:12345/websocket", "",
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"http://localhost/")
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if err != nil {
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panic("Dial: " + err.Error())
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}
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go readFromServer(ws)
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time.Sleep(5e9)
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ws.Close()
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}
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func readFromServer(ws *websocket.Conn) {
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buf := make([]byte, 1000)
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for {
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if _, err := ws.Read(buf); err != nil {
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fmt.Printf("%s\n", err.Error())
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break
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}
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}
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}
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```
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## 链接
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- [目录](directory.md)
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- 上一节：[基于网络的通道 netchan](15.10.md)
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- 下一节：[用 smtp 发送邮件](15.12.md)
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