So how to modify my program correctly??I try to add read in different place
but it still can't get the result I want.
在 2017年11月12日星期日 UTC+8上午5:05:49，Justin Israel写道：
>
>
>
> On Sun, Nov 12, 2017, 10:03 AM Justin Israel <justin...@gmail.com
> <javascript:>> wrote:
>
>>
>>
>> On Sat, Nov 11, 2017, 9:55 PM <28911...@gmail.com <javascript:>> 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
>>
>
> Thanks autocorrect. I have no problem with the elderly, but it has no
> business here in this response.
>
> successful write, if you are choosing to do a request/reply pattern.
>>
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>>
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