Go

Tcp Server (tcpserver.go) package main import ( "fmt" "net" "os" "time" ) func main() { service := ":1200" tcpAddr, err := net.ResolveTCPAddr("tcp4", service) checkError(err) listener, err := net.ListenTCP("tcp", tcpAddr) checkError(err) for { conn, err := listener.Accept() if err != nil { continue } go handleClient(conn) } } func handleClient(conn net.Conn) { defer conn.Close() daytime := time.Now().String() fmt.Fprintf(os.Stderr,"connect time:%s,client ip:%s\r\n",daytime,conn.RemoteAddr().String()) _,err := conn.Write([]byte(daytime)) // don't care about return value checkError(err) fmt.Fprintf(os.Stderr,"send time:%s\r\n",daytime) // we're finished with this client } func checkError(err error) { if err != nil { fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error()) os.Exit(1) } } Tcp Client (tcpclient.go) tcpclient 192.0.0.1:1200 | tcpclient baidu.com:80 package main import ( "fmt" "net" "os" ) 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] tcpAddr, err := net.ResolveTCPAddr("tcp4", service) checkError(err) conn, err := net.DialTCP("tcp", nil, tcpAddr) checkError(err) _, err = conn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n")) checkError(err) result := make([]byte, 1024) _,err = conn.Read(result) checkError(err) fmt.Println("receive from server:\r\n") 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) } }