/** * Created by Administrator on 13-12-9. */ package main import ( "fmt" "os" "net" ) /** * 将string类型的ip地址转换为IP对象 */ func main() { name := "192.168.1.97" ip := net.ParseIP(name) if ip == nil { fmt.Fprintf(os.Stderr, "Err:无效的地址") return } fmt.Fprintf(os.Stdout, "IP: %s %s\n", ip, ip.String()) defaultMask := ip.DefaultMask() fmt.Fprintf(os.Stdout, "DefaultMask: %s %s\n", defaultMask, defaultMask.String()) ones, bits := defaultMask.Size() fmt.Fprintf(os.Stdout, "ones: %d bits: %d\n", ones, bits) }
/** * Created by Administrator on 13-12-9. */ package main import ( "net" "fmt" "os" ) /** * 根据IP和掩码获得网络 */ func main() { name := "192.168.1.97" ip := net.ParseIP(name) mask := ip.DefaultMask() network := ip.Mask(mask) fmt.Fprintf(os.Stdout, "network: %s", network.String()) // 192.168.1.0 // ip: 192.168.1.97 // mask: 255.255.255.0 // network: 192.168.1.0 }
/** * Created by Administrator on 13-12-9. */ package main import ( "net" "fmt" "os" ) /** * 将域名解析Ip地址 * 获得域名对应的所有Ip地址 */ func main() { domain := "www.baidu.com" ipAddr, err := net.ResolveIPAddr("ip", domain) if err != nil { fmt.Fprintf(os.Stderr, "Err: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "%s IP: %s Network: %s Zone: %s\n", ipAddr.String(), ipAddr.IP, ipAddr.Network(), ipAddr.Zone) // 百度,虽然只有一个域名,但实际上,他对应电信,网通,联通等又有多个IP地址 ns, err := net.LookupHost(domain) if err != nil { fmt.Fprintf(os.Stderr, "Err: %s", err.Error()) return } for _, n := range ns { fmt.Fprintf(os.Stdout, "%s", n) // 115.239.210.26 115.239.210.27 这2个地址打开都是百度 } }
/** * Created by Administrator on 13-12-9. */ package main import ( "net" "fmt" "os" ) /** * 查看主机服务器(service)占用的端口,这些服务,都是tcp或者udp的 */ func main() { port, err := net.LookupPort("tcp", "telnet") // 查看telnet服务器使用的端口 if err != nil { fmt.Fprintf(os.Stderr, "未找到指定服务") return } fmt.Fprintf(os.Stdout, "telnet port: %d", port) }
/** * Created by Administrator on 13-12-9. */ package main import ( "net" "fmt" "os" ) func main() { // TCPAddr 包涵IP 和 Port // 将一个host地址转换为TCPAddr。host=ip:port pTCPAddr, err := net.ResolveTCPAddr("tcp", "www.baidu.com:80") if err != nil { fmt.Fprintf(os.Stderr, "Err: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "www.baidu.com:80 IP: %s PORT: %d", pTCPAddr.IP.String(), pTCPAddr.Port) }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" "io/ioutil" ) func main() { url := "www.baidu.com:80" pRemoteTCPAddr, err := net.ResolveTCPAddr("tcp4", url) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } // pLocalTCPAddr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:7070") pTCPConn, err := net.DialTCP("tcp", nil/*pLocalTCPAddr*/, pRemoteTCPAddr) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } n, err := pTCPConn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n")) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } defer pTCPConn.Close() fmt.Fprintf(os.Stdout, "writed: %d\n", n) buf, err := ioutil.ReadAll(pTCPConn) r := len(buf) fmt.Fprintf(os.Stdout, string(buf[:r])) fmt.Fprintf(os.Stdout, "readed: %d\n", r) }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" "time" ) func main() { pTCPAddr, error := net.ResolveTCPAddr("tcp4", ":7070") if error != nil { fmt.Fprintf(os.Stdout, "Error: %s", error.Error()) return } pTCPListener, error := net.ListenTCP("tcp4", pTCPAddr) if error != nil { fmt.Fprintf(os.Stdout, "Error: %s", error.Error()) return } defer pTCPListener.Close() for { pTCPConn, error := pTCPListener.AcceptTCP() if error != nil { fmt.Fprintf(os.Stdout, "Error: %s", error.Error()) continue } go connHandler(pTCPConn) } } func connHandler(conn *net.TCPConn) { defer conn.Close() now := time.Now() conn.Write([]byte(now.String() + "\n")) }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" "time" ) func main() { //url := "baidu.com:80" url := "facebook.com:80" conn, error := net.DialTimeout("tcp", url, time.Second * 10) // 带有超时限制的conn if error != nil { fmt.Fprintf(os.Stderr, "Error: %s", error.Error()) return } n , error := conn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n")) if error != nil { fmt.Fprintf(os.Stderr, "Error: %s", error.Error()) return } fmt.Fprintf(os.Stdout, "writed: %d", n) buf := make([]byte, 2048) n, error = conn.Read(buf) if error != nil { fmt.Fprintf(os.Stderr, "Error: %s", error.Error()) return } fmt.Fprintf(os.Stdout, string(buf[:n])) }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" ) /** * UDP 服务器 */ func main() { pUDPAddr, err := net.ResolveUDPAddr("udp", ":7070") if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } pUDPConn, err := net.ListenUDP("udp", pUDPAddr) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } defer pUDPConn.Close() for { buf := make([]byte, 256) n , pUDPAddr, err := pUDPConn.ReadFromUDP(buf) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "readed: %d", n) n, err = pUDPConn.WriteToUDP(buf, pUDPAddr) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "writed: %d", n) } }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" ) /** * UDP 客户端 */ func main() { pUDPAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:7070") if err != nil { fmt.Fprintf(os.Stderr, "Error ResolveUDPAddr: %s", err.Error()) return } pUDPConn, err := net.DialUDP("udp", nil, pUDPAddr) if err != nil { fmt.Fprintf(os.Stderr, "Error DialUDP: %s", err.Error()) return } n, err := pUDPConn.Write([]byte("你好啊!!!")) if err != nil { fmt.Fprintf(os.Stderr, "Error WriteToUDP: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "writed: %d", n) buf := make([]byte, 1024) n, _, err = pUDPConn.ReadFromUDP(buf) if err != nil { fmt.Fprintf(os.Stderr, "Error ReadFromUDP: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "readed: %d %s", n, string(buf[:n])) }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" ) /* 很多时候,服务器会处理多个端口的监听!可以使用select轮询处理这种情况 */ func main() { lsr, err := net.Listen("tcp", ":7070") if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } for { conn , err := lsr.Accept() if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) continue } go connHandler(conn) } fmt.Println("Done !") } func connHandler(conn net.Conn) { defer conn.Close() var buf[512]byte for { n , err := conn.Read(buf[0:]) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } _, err = conn.Write(buf[0:n]) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } } }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" "bufio" ) func main() { conn, err := net.Dial("tcp", "192.168.1.97:7070") if err != nil { fmt.Sprint(os.Stderr, "Error: %s", err.Error()) return } go func() { var buf [512]byte for { n , err := conn.Read(buf[0:]) if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } fmt.Fprintf(os.Stdout, string(buf[0:n])) } }() for { fmt.Fprintf(os.Stdout, "\n输入:") pReader := bufio.NewReader(os.Stdin) line, _, err := pReader.ReadLine() if err != nil { fmt.Fprintf(os.Stderr, "Error: %s", err.Error()) return } conn.Write(line[0:]) } }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" ) /** UDP Server */ func main() { packetConn, err := net.ListenPacket("udp", ":7070") if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } defer packetConn.Close() var buf [512]byte for { n , addr, err := packetConn.ReadFrom(buf[0:]) if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "recv: %s", string(buf[0:n])) _, err = packetConn.WriteTo(buf[0:n], addr) if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } } }
/** * Created by Administrator on 13-12-10. */ package main import ( "net" "fmt" "os" "time" ) /** UDP Client */ func main() { conn, err := net.Dial("udp", "127.0.0.1:7070") if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } defer conn.Close() _, err = conn.Write([]byte("你好啊UDP")) if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } var buf [512]byte conn.SetReadDeadline(time.Now().Add(time.Second * 1)) // 阻塞,直到接收到消息,设置阻塞时间1秒 n, err := conn.Read(buf[0:]) if err != nil { fmt.Fprintf(os.Stdout, "Error: %s", err.Error()) return } fmt.Fprintf(os.Stdout, "recv: %s", string(buf[0:n])) }
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