在Scala中使用套接字编程连接两台计算机

Question

我正在尝试将笔记本电脑连接到另一个网络中的另一台笔记本电脑，并且执行以下操作：

1-分别在我朋友的笔记本电脑和我的笔记本电脑中打开两个端口

2-两台笔记本电脑的防火墙也都关闭了

下面是我的代码

服务器类：

// Simple server
import java.net._
import java.io._
import scala.io._

object Server {
  def main(args: Array[String]): Unit = {
    val server = new ServerSocket(2076)
    while (true) {
      val s = server.accept()
      val in = new BufferedSource(s.getInputStream()).getLines()
      val out = new PrintStream(s.getOutputStream())
      out.println(in.next())
      out.flush()
      s.close()
    }
  }
}

客户端类：

// Simple client
import java.net._
import java.io._
import scala.io._

object Client {
  def main(args: Array[String]): Unit = {

//  val s = new Socket("192.168.1.15",2076)
    val s = new Socket("185.98.222.147",2076)
    lazy val in = new BufferedSource(s.getInputStream()).getLines()
    val out = new PrintStream(s.getOutputStream())
    out.println("Hello, world")
    out.flush()
    println("Received: " + in.next())
    s.close()
  }
}

我尝试两次运行代码： 首先使用我朋友的本地IP，然后在下面出现此错误，当我尝试使用朋友的公共IP时，代码只是在双方等待，什么也没做。 谁能告诉我我们做错了什么？

   java.net.ConnectException: Connection refused (Connection refused)
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at java.net.Socket.connect(Socket.java:538)
        at java.net.Socket.<init>(Socket.java:434)
        at java.net.Socket.<init>(Socket.java:211)
        at Client$.main(Client.scala:9)
        at Client.main(Client.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at scala.reflect.internal.util.ScalaClassLoader.$anonfun$run$2(ScalaClassLoader.scala:99)
        at scala.reflect.internal.util.ScalaClassLoader.asContext(ScalaClassLoader.scala:34)
        at scala.reflect.internal.util.ScalaClassLoader.asContext$(ScalaClassLoader.scala:30)
        at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:125)
        at scala.reflect.internal.util.ScalaClassLoader.run(ScalaClassLoader.scala:99)
        at scala.reflect.internal.util.ScalaClassLoader.run$(ScalaClassLoader.scala:91)
        at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:125)
        at scala.tools.nsc.CommonRunner.run(ObjectRunner.scala:22)
        at scala.tools.nsc.CommonRunner.run$(ObjectRunner.scala:21)
        at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:39)
        at scala.tools.nsc.CommonRunner.runAndCatch(ObjectRunner.scala:29)
        at scala.tools.nsc.CommonRunner.runAndCatch$(ObjectRunner.scala:28)
        at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:39)
        at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:66)
        at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:85)
        at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)
        at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:101)
        at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)