tcp
Go简化了传统的socket处理步骤：
- 服务器端的流程：Listen->Accept(->Decode->Close)
- 客户端的流程：Dial->Encode->Close
package main
import (
"fmt"
"encoding/gob"
"net"
"time"
)
func server() {
// listen on a port
listen, err := net.Listen("tcp", ":9999")
if err != nil {
fmt.Println(err)
return
}
for {
// accept a connection
connection, err := listen.Accept()
if err != nil {
fmt.Println(err)
continue
}
// handle the connection
go handleServerConnection(connection)
}
}
func handleServerConnection(connection net.Conn) {
// receive the message
var msg string
err := gob.NewDecoder(connection).Decode(&msg)
if err != nil {
fmt.Println(err)
} else {
fmt.Println("Received: ", msg)
}
connection.Close()
}
func client() {
// connect to the server
connection, err := net.Dial("tcp", "127.0.0.1:9999")
if err != nil {
fmt.Println(err)
return
}
// send the message
msg := "Hello, world!"
fmt.Println("Sending: ", msg)
err = gob.NewEncoder(connection).Encode(msg)
if err != nil {
fmt.Println(err)
}
connection.Close()
}
/*
D:\examples>go run helloworld.go
Sending: Hello, world!
Sending: Hello, world!
Sending: Hello, world!
Received: Hello, world!
Received: Hello, world!
Sending: Hello, world!
Received: Hello, world!
Sending: Hello, world!
Received: Hello, world!
Received: Hello, world!
D:\examples>
*/
func main() {
go server()
for i := 0; i < 5; i++ {
go client()
time.Sleep(10000)
}
var input string
fmt.Scanln(&input)
}
HTTP
下面是动态网页的示例。这种做法和Java Servlet HttpServlet是一致的，但如何实现MVC，则超出Introducing Go的范围。
package main
import (
//"fmt"
"net/http"
"io"
)
func hello(res http.ResponseWriter, req *http.Request) {
res.Header().Set("Content-Type", "text/html")
io.WriteString(
res,
`<DOCTYPE html>
<html>
<head>
<title>Hello, World</title>
</head>
<body>
Hello, World!
</body>
</html>`,
)
}
func main() {
http.HandleFunc("/hello", hello)
http.ListenAndServe(":9000", nil)
}
代码运行后，在浏览器输入http://localhost:9000/hello，则浏览器会显示Hello, World!。
处理静态文件：
http.Handle(
"/assets/",
http.StripPrefix(
"/assets/",
http.FileServer(http.Dir("assets")),
),
)
RPC
略
有疑问加站长微信联系（非本文作者）
