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) != 2 {
        fmt.Fprintf(os.Stderr, "Usage : %s host:port", os.Args[0])
        os.Exit(1)
    }
    service := os.Args[1]
    conn, err := net.Dial("tcp", service)
    checkError(err)

    _, err = conn.Write([]byte("HEAD / HTTPD/1.0

"))
    checkError(err)

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

    fmt.Println(string(result))

    os.Exit(0)
}

func checkError(err error) {
    if err != nil {
        fmt.Fprintf(os.Stderr, "Fatal error : %s
", err.Error())
        os.Exit(1)
    }
}

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

    result := bytes.NewBuffer(nil)
    var buf [512]byte
    for {
        n, err := conn.Read(buf[0:])
        result.Write(buf[0: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:80
over...
HTTP/1.1 302 Found
Date: Mon, 20 Jul 2015 15:18:13 GMT
Server: Apache/2.2.22 (Ubuntu)
X-Powered-By: PHP/5.3.10-1ubuntu3.19
Location: web/index.php
Vary: Accept-Encoding
Connection: close
Content-Type: text/html