学习进度笔记

学习进度笔记23

模拟器代码

import java.io.{PrintWriter}

import java.net.ServerSocket

import scala.io.Source

 

object StreamingSimulation {

  // 定义随机获取整数的方法

  def index(length: Int) = {

    import java.util.Random

    val rdm = new Random

    rdm.nextInt(length)

  }

 

  def main(args: Array[String]) {

    // 调用该模拟器需要三个参数，分为为文件路径、端口号和间隔时间（单位：毫秒）

    if (args.length != 3) {

      System.err.println("Usage: <filename> <port> <millisecond>")

      System.exit(1)

    }

 

    // 获取指定文件总的行数

    val filename = args(0)

    val lines = Source.fromFile(filename).getLines.toList

    val filerow = lines.length

 

    // 指定监听某端口，当外部程序请求时建立连接

    val listener = new ServerSocket(args(1).toInt)

    while (true) {

      val socket = listener.accept()

      new Thread() {

        override def run = {

          println("Got client connected from: " + socket.getInetAddress)

          val out = new PrintWriter(socket.getOutputStream(), true)

          while (true) {

            Thread.sleep(args(2).toLong)

            // 当该端口接受请求时，随机获取某行数据发送给对方

            val content = lines(index(filerow))

            println(content)

            out.write(content + '\n')

            out.flush()

          }

          socket.close()

        }

      }.start()

    }

  }

}