先给出结论:
同一个进程,使用一个端口,然后连接关闭,大约需要30s后才可再次使用这个端口。
测试
首先使用端口9001连接服务端,发送数据,然后关闭连接,接着再次使用端口9001连接服务端,如果连接失败,间隔15s后,再次尝试,最多尝试3次,。
client
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|
package main import ( "bufio" "fmt" "net" "os" "time" ) func DialCustom(network, address string, timeout time.Duration, localIP []byte, localPort int)(net.Conn,error) { netAddr := &net.TCPAddr{Port:localPort} if len(localIP) != 0 { netAddr.IP = localIP } fmt.Println("netAddr:", netAddr) d := net.Dialer{Timeout: timeout, LocalAddr: netAddr} return d.Dial(network, address) } func getOneConn() { serverAddr := "127.0.0.1:8080" // 172.28.172.180 //localIP := []byte{0xAC, 0x1C, 0xAC, 0xB4} // IP localIP := []byte{} // any IP localPort := 9001 var conn net.Conn var err error for i:=0;i<3;i++{ conn, err = DialCustom("tcp", serverAddr, time.Second*10, localIP,localPort) if err != nil { fmt.Println("dial failed:", err) if i == 2 { os.Exit(1) } time.Sleep(15*time.Second) } else { break } } defer conn.Close() buffer := make([]byte, 512) reader := bufio.NewReader(conn) n, err2 := reader.Read(buffer) if err2 != nil { fmt.Println("Read failed:", err2) return } fmt.Println("count:", n, "msg:", string(buffer)) } func main() { getOneConn() fmt.Println("=========================") getOneConn() fmt.Println("=========================") select{} } |
server
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package main import ( "fmt" "net" "log" ) func main() { addr := "0.0.0.0:8080" tcpAddr, err := net.ResolveTCPAddr("tcp",addr) if err != nil { log.Fatalf("net.ResovleTCPAddr fail:%s", addr) } listener, err := net.ListenTCP("tcp", tcpAddr) if err != nil { log.Fatalf("listen %s fail: %s", addr, err) } else { log.Println("rpc listening", addr) } for { conn, err := listener.Accept() if err != nil { log.Println("listener.Accept error:", err) continue } go handleConnection(conn) } } func handleConnection(conn net.Conn) { //defer conn.Close() var buffer []byte = []byte("You are welcome. I'm server.") n, err := conn.Write(buffer) if err != nil { fmt.Println("Write error:", err) } fmt.Println("send:", n) fmt.Println("connetion end") } |
output
client输出:
$ ./client
netAddr: :9001
count: 28 msg: You are welcome. I'm server.
=========================
netAddr: :9001
dial failed: dial tcp :9001->127.0.0.1:8080: bind: address already in use
netAddr: :9001
dial failed: dial tcp :9001->127.0.0.1:8080: bind: address already in usenetAddr: :9001
count: 28 msg: You are welcome. I'm server.
=========================
经过3次重试,30s后,才可以重新使用同一个端口9001进行连接。也就是同一个进程的情况狂下,一个连接关闭后,端口大约30s后才可以被使用。
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原文链接:https://blog.csdn.net/lanyang123456/article/details/80754010