[TOC] ## net.Pipe 雙向通信 ``` c1, c2 := net.Pipe() go func() { for i := 0; i < 10; i++ { io.WriteString(c1, "haha\n") time.Sleep(1 * time.Second) } }() go func() { for i := 0; i < 10; i++ { io.WriteString(c2, "haha\n") time.Sleep(1 * time.Second) } }() go func() { reader := bufio.NewScanner(c2) for reader.Scan() { fmt.Printf("c1->c2 %+v\n", reader.Text()) } }() go func() { reader := bufio.NewScanner(c1) for reader.Scan() { fmt.Printf("c2->c1 %+v\n", reader.Text()) } }() time.Sleep(3 * time.Second) ``` ## net.SplitHostPort ``` port, p, _ := net.SplitHostPort("127.0.0.1:1234") fmt.Println(port) // 127.0.0.1 fmt.Println(p) // 1234 ``` ## net.ResolveTCPAddr ``` addr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:1234") if err != nil { log.Fatal(err) } tcp, err := net.ListenTCP("tcp", addr) for { tcp, err := tcp.Accept() if err != nil { log.Fatal(err) } go func(tcp net.Conn) { io.Copy(tcp, tcp) }(tcp) } ``` ### net.ResolveIPAddr() ### net.ResolveUDPAddr() ### net.ResolveUnixAddr() ## net.Listen ``` listen, err := net.Listen("tcp", ":1234") if err != nil { log.Fatal(err) } for { con, err := listen.Accept() if err != nil { log.Fatal(err) } go func(con net.Conn) { io.Copy(con, con) }(con) } ``` ### net.ListenTCP() ### net.ListenPacket() ### net.ListenIP() ### net.ListenUDP() ### net.ListenMulticastUDP() ### net.ListenUnix() ``` laddr := &net.UnixAddr{Name: "", Net: "unix"} ln, err := net.ListenUnix("unix", laddr) if err != nil { log.Fatal(err) } ln.Close() ``` ### net.ListenUnixgram() ## SetReadDeadline ``` l, e := net.Listen("tcp", ":9010") if e != nil { panic(e) } defer l.Close() for{ accept, e := l.Accept() if e != nil { log.Println(e) } accept.SetReadDeadline(time.Now().Add(9*time.Second)) conn[accept.RemoteAddr().String()]=accept go handleCon(accept) } ``` ## net.Dial ``` c, e := net.Dial("tcp", ":9010") if e != nil { panic(e) } c.Write([]byte("hello word")) ``` ### net.DialTimeout() ### net.DialIP() ### net.DialTCP() ### net.DialUDP() ### net.DialUnix() ### DialContext ``` var d net.Dialer ctx, cancel := context.WithTimeout(context.Background(), time.Minute) defer cancel() conn, err := d.DialContext(ctx, "tcp", "localhost:84") if err != nil { log.Fatalf("Failed to dial: %v", err) } defer conn.Close() if _, err := conn.Write([]byte("Hello, World!")); err != nil { log.Fatal(err) } ``` ## net.ParseIP ``` type IP func IPv4(a, b, c, d byte) IP func ParseIP(s string) IP func (ip IP) IsGlobalUnicast() bool func (ip IP) IsLinkLocalUnicast() bool func (ip IP) IsInterfaceLocalMulticast() bool func (ip IP) IsLinkLocalMulticast() bool func (ip IP) IsMulticast() bool func (ip IP) IsLoopback() bool func (ip IP) IsUnspecified() bool func (ip IP) DefaultMask() IPMask func (ip IP) Equal(x IP) bool func (ip IP) To16() IP func (ip IP) To4() IP func (ip IP) Mask(mask IPMask) IP func (ip IP) String() string func (ip IP) MarshalText() ([]byte, error) func (ip *IP) UnmarshalText(text []byte) error ``` 示例 ``` ip := net.ParseIP("127.0.0.1") fmt.Println(ip.String()) // 127.0.0.1 ip = net.ParseIP("123") fmt.Println(ip) // <nil> ``` ### IPMask 根據ip獲取掩碼 ``` name := "192.168.1.97" ip := net.ParseIP(name) mask := ip.DefaultMask() network := ip.Mask(mask) fmt.Printf("%+v\n", network.String()) // 192.168.1.0 ``` ## net.LookupHost 根據域名獲取 ip ``` addrs, err := net.LookupHost("www.baidu.com") if err != nil { fmt.Println(err) return } for i, v := range addrs { fmt.Println(i, "=>", v) } //0 => 61.135.169.121 //1 => 61.135.169.125 ``` ### net.LookupIP() ### net.LookupAddr() ### net.LookupCNAME() ### net.LookupHost() ### net.LookupMX() ### net.LookupNS() ### net.LookupPort() ### net.LookupSRV() ### net.LookupTXT()