Question

我可以在本地主机上的简单TCP客户端和AVD Android应用程序上的简单TCP服务器之间创建套接字连接。

AVD在虚拟路由器后面运行，并且要连接到AVD，我需要在虚拟路由器上配置端口转发，就像这样

adb -s emulator-5554转发tcp：5000 tcp：6000

这是一个简单的TCP客户端程序，它在本地主机127.0.0.1上运行，并连接到在端口6000上侦听的AVD服务器

public class SimpleTcpClient
{
   public static void main(String argv[]) throws Exception
   {
      String host = "127.0.0.1";
      //String host = "10.9.2.121";
      int port = 5000;

      String sentenceToServer = "hello server";

      Socket clientSocket = new Socket(host, port);
      DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
      BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
      outToServer.writeBytes(sentenceToServer+"\n" );
      String serverResponse = inFromServer.readLine();
      clientSocket.close();
   }
}

这是在android仿真器中运行on app的服务器上监听端口6000的服务器的初始化方法

private void initTcpTestServer()
{
  Log.d("TAG", "initTcpTestServer()");

  try
  {

     String clientSentence;
     ServerSocket welcomeSocket = new ServerSocket(6000);
     welcomeSocket.setReuseAddress(true);

     while ( true )
     {
        Socket connectionSocket = welcomeSocket.accept();
        BufferedReader inFromClient = new BufferedReader(
              new InputStreamReader(connectionSocket.getInputStream()));
        DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
        clientSentence = inFromClient.readLine();
        clientSentence = "hello client";
        outToClient.writeBytes(clientSentence + "\n");
     }
  }
  catch ( IOException e )
  {
     e.printStackTrace();
  }
}

如果我在本地主机SimpleTcpClient上运行127.0.0.1，则可以创建套接字连接。但是，一旦我尝试在另一台计算机上运行SimpleTcpClient，我就会得到

Exception in thread "main" 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 com.slacorp.eptt.android.testclient.SimpleTcpClient.main(SimpleTcpClient.java:22)

我唯一要做的更改是SimpleTcpClient，是将目标IP地址从本地主机127.0.0.1更改为10.9.2.121

public class SimpleTcpClient
{
   public static void main(String argv[]) throws Exception
   {
      //String host = "127.0.0.1";
      String host = "10.9.2.121";
      int port = 5000;

      String sentenceToServer = "hello server";
      System.out.println("initializing socket");

      Socket clientSocket = new Socket(host, port);
      DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
      BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
      outToServer.writeBytes(sentenceToServer+"\n" );
      String serverResponse = inFromServer.readLine();
      clientSocket.close();
   }
}

SimpleTcpClient将不会连接到AVD上的服务器，但是如果我使服务器运行在10.9.2.121上，使得服务器不在虚拟路由器后面的AVD上，则套接字连接有效，所以我感到困惑。

如何将远程TCP客户端连接到AVD？

无法将远程TCP客户端连接到Android虚拟设备上的TCP服务器

0 个答案: