用Golang实现 echo服务器/客户端
本节我们就从实现一个简单的echo的服务端/客户端来入手, 了解golang的实现tcp长连接服务器的具体细节.
首先, 我们先列一下服务端的实现思路及步骤:
我们可以在实验环境的主文件夹中, 建立一个名为server.go的文件, 在其中编写服务器端程序代码
服务端程序清单如下:
server.go
package mainimport ( "bufio" "fmt" "net" "time")func main() { var tcpAddr *net.TCPAddr tcpAddr, _ = net.ResolveTCPAddr("tcp", "127.0.0.1:9999") tcpListener, _ := net.ListenTCP("tcp", tcpAddr) defer tcpListener.Close() for { tcpConn, err := tcpListener.AcceptTCP() if err != nil { continue } fmt.Println("A client connected : " + tcpConn.RemoteAddr().String()) go tcpPipe(tcpConn) }}func tcpPipe(conn *net.TCPConn) { ipStr := conn.RemoteAddr().String() defer func() { fmt.Println("disconnected :" + ipStr) conn.Close() }() reader := bufio.NewReader(conn) for { message, err := reader.ReadString('\n') if err != nil { return } fmt.Println(string(message)) msg := time.Now().String() + "\n" b := []byte(msg) conn.Write(b) }}
接着, 我们打开终端, 编译服务端程序:
go build server.go
编译成功的话, 会在主目录中看到编译成功的server程序
接下来, 是客户端的代码实现步骤:
程序清单如下:
client.go
package mainimport ( "bufio" "fmt" "net" "time")var quitSemaphore chan boolfunc main() { var tcpAddr *net.TCPAddr tcpAddr, _ = net.ResolveTCPAddr("tcp", "127.0.0.1:9999") conn, _ := net.DialTCP("tcp", nil, tcpAddr) defer conn.Close() fmt.Println("connected!") go onMessageRecived(conn) b := []byte("time\n") conn.Write(b) <-quitSemaphore}func onMessageRecived(conn *net.TCPConn) { reader := bufio.NewReader(conn) for { msg, err := reader.ReadString('\n') fmt.Println(msg) if err != nil { quitSemaphore <- true break } time.Sleep(time.Second) b := []byte(msg) conn.Write(b) }}
编译客户端:
go build client.go
最后, 开启两个终端, 分别运行server和client
可以看到以下类似的输出:
connected!2015-03-19 23:42:08.4875559 +0800 CST
2015-03-19 23:42:09.4896132 +0800 CST
2015-03-19 23:42:10.4906704 +0800 CST
2015-03-19 23:42:11.4917277 +0800 CST
2015-03-19 23:42:12.4927849 +0800 CST
2015-03-19 23:42:13.4938422 +0800 CST
2015-03-19 23:42:14.4948995 +0800 CST
2015-03-19 23:42:15.4959567 +0800 CST
2015-03-19 23:42:16.497014 +0800 CST
2015-03-19 23:42:17.4980712 +0800 CST
2015-03-19 23:42:18.4991285 +0800 CST
2015-03-19 23:42:19.5001857 +0800 CST
这样, 一个简单的echo服务器/客户端就实现了
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