Swift

指令

hello.swift

#!/usr/bin/env swift
import Foundation

@_cdecl("sayHello")
public func sayHello() {
  print("Hello from Swift!")
}

sayHello()

swift hello.swift

Start a server at port 8081

""

#!/usr/bin/env swift

import Foundation
import Network

// 设定监听的端口
let port = NWEndpoint.Port(rawValue: 8081)!

// 创建监听器
let listener = try! NWListener(using: .tcp, on: port)

// 新连接的处理函数
listener.newConnectionHandler = { connection in
  connection.start(queue: .main)  // 在主队列上启动连接

  // 接收数据
  connection.receive(minimumIncompleteLength: 1, maximumLength: 10000) {
    (data, _, isComplete, error) in
    if let data = data, !data.isEmpty {
      let request = String(data: data, encoding: .utf8) ?? "Invalid request"
      print("Received HTTP request:\n\(request)")  // 打印接收到的请求

      // HTTP 响应内容
      let httpResponse = """
        HTTP/1.1 200 OK\r
        Content-Type: text/plain\r
        Connection: close\r
        \r
        Hello, world from Swift server on port \(port)!
        """

      // 发送响应
      let responseData = httpResponse.data(using: .utf8)
      connection.send(
        content: responseData,
        completion: .contentProcessed({ sendError in
          if let error = sendError {
            print("Failed to send response: \(error)")
          }
          connection.cancel()  // 发送完毕后关闭连接
        }))
    } else if let error = error {
      print("Failed to receive data: \(error)")
      connection.cancel()  // 出错时关闭连接
    }
  }
}

// 开始监听
listener.start(queue: .main)
print("Server started on port \(port)")

// 使主运行循环继续运行，防止程序退出
RunLoop.main.run()