GO语言练习：网络编程 TCP 示例

1、代码

2、编译及运行

---

1、网络编程 TCP 示例 simplehttp.go 代码

 package main

 import (
     "net"
     "os"
     "io"
     "bytes"
     "fmt"
 )

 func main() {
     if len(os.Args) !=  {
         fmt.Fprintf(os.Stderr, "Usage : %s host:port", os.Args[])
         os.Exit()
     }
     service := os.Args[]
     conn, err := net.Dial("tcp", service)
     checkError(err)

     _, err = conn.Write([]byte("HEAD / HTTPD/1.0\r\n\r\n"))
     checkError(err)

     result, err := readFully(conn)
     checkError(err)

     fmt.Println(string(result))

     os.Exit()
 }

 func checkError(err error) {
     if err != nil {
         fmt.Fprintf(os.Stderr, "Fatal error : %s\n", err.Error())
         os.Exit()
     }
 }

 func readFully(conn net.Conn) ([]byte, error) {
     defer conn.Close()

     result := bytes.NewBuffer(nil)
     var buf []byte
     for {
         n, err := conn.Read(buf[:])
         result.Write(buf[:n])
         if err != nil {
             if err == io.EOF {
                 fmt.Println("over...")
                 break
             }
             return nil, err
         }
     }

     return result.Bytes(), nil
 }

2、编译及运行

　　2.1）编译

$ go build simplehttp.go
$ ls
simplehttp  simplehttp.go

　　2.2）运行

$ ./simplehttp www.xin3e.com:
over...
HTTP/1.1  Found
Date: Mon,  Jul  :: GMT
Server: Apache/2.2. (Ubuntu)
X-Powered-By: PHP/5.3.-1ubuntu3.
Location: web/index.php
Vary: Accept-Encoding
Connection: close
Content-Type: text/html