To create a TCP server in Go, you can use the net package.
Here’s an example of creating a simple TCP server:
package mainimport ("fmt""net")func main() {// listen on port 8080ln, err := net.Listen("tcp", ":8080")if err != nil {fmt.Println(err)return}defer ln.Close()fmt.Println("TCP server listening on :8080")for {// wait for a connectionconn, err := ln.Accept()if err != nil {fmt.Println(err)continue}// handle the connection in a separate goroutinego handleConnection(conn)}}func handleConnection(conn net.Conn) {defer conn.Close()// read from the connectionbuf := make([]byte, 1024)_, err := conn.Read(buf)if err != nil {fmt.Println(err)return}// echo back to the clientconn.Write(buf)}
In this example, we’re listening on port 8080 for incoming TCP connections. When a connection is accepted, we spawn a new goroutine to handle it. The handleConnection() function reads from the connection and echoes the data back to the client.
To test this server, you can use the telnet command:
$ telnet localhost 8080Trying 127.0.0.1...Connected to localhost.Escape character is '^]'.hello, world!hello, world!Connection closed by foreign host.
