On Sat, Nov 11, 2017, 9:55 PM <2891132l...@gmail.com> wrote:
> this is the server program：
>
>> package main
>>
>> import (
>> "fmt"
>> "net"
>> "os"
>>
> "strings"
>> )
>>
>> func main() {
>>
>> listener, err := net.Listen("tcp", "0.0.0.0:400")
>>
> checkError(err)
>> for i := 0; i < 10; i++ {
>> conn, err := listener.Accept()
>> if err != nil {
>> continue
>> }
>> handleClient(conn)
>> conn.Close()
>> }
>> }
>> func handleClient(conn net.Conn) {
>> var buf [512]byte
>> for {
>> n, err := conn.Read(buf[0:])
>> if err != nil {
>> return
>> }
>> rAddr := conn.RemoteAddr()
>> fmt.Println("receive from client", rAddr.String(), string(buf[0:n]))
>>
> n, err2 := conn.Write([]byte("welcome client!"))
>>
> if err2 != nil {
>> return
>> }
>>
> aa := string("nice to meet you")
>> if strings.Contains(string(buf[0:n]), aa) {
>> n, err2 = conn.Write([]byte("nice to meet you too"))
>>
> if err2 != nil {
>> return
>> }
>> }
>> }
>> }
>> func checkError(err error) {
>> if err != nil {
>> fmt.Fprintf(os.Stderr, "fatal error: %s", err.Error())
>> os.Exit(1)
>> }
>> }
>>
>
>>
> this is the client program:
> package main
>
> import (
> "fmt"
> "net"
> "os"
> )
>
> func main() {
> var buf [512]byte
> if len(os.Args) != 2 {
> fmt.Fprintf(os.Stderr, "usage:%s host:port\n", os.Args[0])
> }
> _, err := net.ResolveTCPAddr("tcp", "127.0.0.1:400")
> checkError(err)
> conn, err := net.Dial("tcp", "127.0.0.1:400")
> checkError(err)
> rAddr := conn.RemoteAddr()
> n, err := conn.Write([]byte("hello server!"))
> checkError(err)
> n, err = conn.Write([]byte(" nice to meet you"))
> checkError(err)
> n, err = conn.Read(buf[0:])
> if err != nil {
> return
> }
> checkError(err)
> fmt.Println("reply from server", rAddr.String(), string(buf[0:n]))
> conn.Close()
> os.Exit(0)
> }
> func checkError(err error) {
> if err != nil {
> fmt.Fprintf(os.Stderr, "fatal error: %s", err.Error())
> os.Exit(1)
> }
> }
>
>
> Just a little change and I run it successfully.But I am doubt why it can't
> print "nice to meet you too"?？And how to solve it??
>
Your server does the following on a new connection
n, err := conn.Read(buf[0:])
...
n, err2 := conn.Write([]byte("welcome client!"))
Then your client is doing the following on the start of the connection
n, err := conn.Write([]byte("hello server!"))
...
n, err = conn.Write([]byte(" nice to meet you"))
Both the client and server are blocking on writing and no one is doing any
reading. Make sure your client does a read after elderly successful write,
if you are choosing to do a request/reply pattern.
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