Swift Network.framework Study 2019 1205 "Server TCP"

Study

Network.framework Study: Server side

environment

Client：Java、NetBeans Server：Swift、Xcode

Client Source Java

package example.java.network;

import java.io.PrintWriter;
import java.net.Socket;

public class ExampleClientSocket {
    public static void main(String[] args) {
        try(Socket socket = new Socket("localhost", 7777);
            PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);) {
            printWriter.println("Example Send Data");
        }
        catch(Exception e) {
            System.out.println(e);
        }
    }
}

Server Source Swift

Use NWLister Receive processing registration and start execution in NWConnection after connection establishment

main.swift

import Foundation
import Network

var networkServer = NetworkServer()

networkServer.startListener()

while networkServer.running {
    sleep(1)
}

NetworkServer.swift

import Foundation
import Network

class NetworkServer {
    public var running = true

    func startListener() {
        let myQueue = DispatchQueue(label: "ExampleNetwork")

        do {
            let nWListener = try NWListener(using: .tcp, on: 7777)
            nWListener.newConnectionHandler = { (newConnection) in
                print("New Connection!!")
                newConnection.receiveMessage(completion: { (data, context, flag, error) in
                    print("receiveMessage")
                    let receiveData = [UInt8](data!)
                    print(receiveData)
                })
                newConnection.start(queue: myQueue)
            }
            nWListener.start(queue: myQueue)
            print("start")
        }
        catch {
            print(error)
        }
    }
}