go tcp

 1 package main
 2 
 3 import (
 4     "fmt"
 5     "net"
 6     "os"
 7 )
 8 
 9 func checkError(err error){
10     if  err != nil {
11         fmt.Println("Error: %s", err.Error())
12         os.Exit(1)  
13     }
14 }
15 
16 func recvConnMsg(conn net.Conn) {
17 //  var buf [50]byte
18     buf := make([]byte, 50) 
19 
20     defer conn.Close()
21 
22     for {
23         n, err := conn.Read(buf)
24 
25         if err != nil {
26             fmt.Println("conn closed")
27             return  
28         }   
29 
30         //fmt.Println("recv msg:", buf[0:n])
31         fmt.Println("recv msg:", string(buf[0:n]))
32     }   
33 }
34 
35 func main() {
36     listen_sock, err := net.Listen("tcp", "localhost:10000")
37     checkError(err)
38     defer listen_sock.Close()
39 
40     for {
41         new_conn, err := listen_sock.Accept()
42         if err != nil {
43             continue    
44         }   
45 
46         go recvConnMsg(new_conn)
47     }
48 
49 }

 1 package main
 2 
 3 import (
 4     "fmt"
 5     "net"
 6     "os"
 7 )
 8 
 9 func checkError(err error){
10     if  err != nil {
11         fmt.Println("Error: %s", err.Error())
12         os.Exit(1)  
13     }
14 }
15 
16 func main() {
17     conn, err := net.Dial("tcp", "127.0.0.1:10000")
18     checkError(err)
19     defer conn.Close()  
20 
21     conn.Write([]byte("Hello world!"))  
22 
23     fmt.Println("send msg")
24 }