golang入門案例之SOCKET
阿新 • • 發佈:2018-01-15
int div 進行 lec ont func 轉換 exit oca
//服務端代碼
package main import ( "fmt" "net" "log" "os" "encoding/binary" ) func main() { //建立socket,監聽端口 netListen, err := net.Listen("tcp", "localhost:8090") CheckError(err) defer netListen.Close() Log("Waiting for clients") for { conn, err := netListen.Accept() if err != nil { continue } Log(conn.RemoteAddr().String(), " tcp connect success") handleConnection(conn) } } //處理連接 func handleConnection(conn net.Conn) { //buffer := make([]byte, 2048) for { var pi float64 var a uint16 err := binary.Read(conn, binary.LittleEndian, &pi)//讀取浮點數 err = binary.Read(conn, binary.LittleEndian, &a)//讀取整數 CheckError(err) if err != nil { Log(conn.RemoteAddr().String(), " connection error: ", err) return } Log(conn.RemoteAddr().String(), "receive data string:\n", (pi), ", uint16 a= " , a) } } func Log(v ...interface{}) { log.Println(v...) } func CheckError(err error) { if err != nil { fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error()) os.Exit(1) } }
客戶端:
package main import ( "fmt" "net" "os" "bytes" "encoding/binary" ) var x float32 = 1.2 //1.2 func init() { //1.3 fmt.Printf("p1 package, x:%f\n", x) //1.4 } func Donothing() { fmt.Println("do nothing.\n") } func sender(conn net.Conn) { var pi float64 = 3.141592653589793 buf := new(bytes.Buffer) err := binary.Write(buf, binary.LittleEndian, pi)//向buf中寫入浮點數 if err != nil { fmt.Println("binary.Write failed:", err) } // 這裏可以繼續往buf裏寫, 都存在buf裏 err = binary.Write(buf, binary.LittleEndian, uint16(12345))//向buf中寫入整數 if err != nil { fmt.Println("binary.Write failed:", err) } fmt.Print(buf.Bytes()) // [24 45 68 84 251 33 9 64] fmt.Println("send over") conn.Write(buf.Bytes())//向socket中寫入buf //words := "hello world!" //conn.Write([]byte(words)) } func main() { server := "127.0.0.1:8090" tcpAddr, err := net.ResolveTCPAddr("tcp4", server)//轉換成TCP地址 if err != nil { fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error()) os.Exit(1) } conn, err := net.DialTCP("tcp", nil, tcpAddr)//進行TCP連接 if err != nil { fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error()) os.Exit(1) } fmt.Println("connect success") sender(conn)//發送請求 }
golang入門案例之SOCKET