如何建立TCP连接并将数据发送到Android虚拟设备应用

Question

我正在Android模拟器上创建和测试简单的TCP服务器。

我使用一个简单的Java客户端程序尝试连接到在模拟器上运行的服务器。 我尝试发送一个简单的字符串，例如“ hello world”。

我认为客户端和服务器之间的连接已成功初始化； 但是，数据不会路由到Android设备。

服务器线程在clientSentence = inFromClient.readLine();行clientSentence = inFromClient.readLine(); 并且客户端线程在String serverResponse = inFromServer.readLine(); 。

我已经根据具有ADB Google 文档将本地主机端口6100端口转发到了AVD虚拟端口7100

adb -s emulator-5554 forward tcp:6100 tcp:7100

这是Java类TCPTestClient

public class TCPTestClient
{
   public static void main(String argv[]) throws Exception
   {
      String sentenceToServer = "hello server";
      System.out.println("initializing socket");
      Socket clientSocket = new Socket("127.0.0.1", 6100);
      System.out.println("socket initialized");
      System.out.println("getting output stream to server");
      DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
      System.out.println("found output stream to server");
      System.out.println("getting input stream from server");
      BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
      System.out.println("found input stream from server");
      System.out.println("writing sentence to server");
      outToServer.writeBytes(sentenceToServer );
      System.out.println("sentence written");
      System.out.println("waiting for sentence response from server");
      String serverResponse = inFromServer.readLine();
      System.out.println("serverResponse = "+serverResponse);
      System.out.println("socket closed");
      clientSocket.close();
   }
}

这是Android应用程序方法initTcpTestServer()

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

     String clientSentence;
     ServerSocket welcomeSocket = new ServerSocket(7100);

     while ( true )
     {
        Log.d("TAG", "looking for socket");
        Socket connectionSocket = welcomeSocket.accept();
        Log.d("TAG", "socket accepted");
        Log.d("TAG", "getting input stream");
        BufferedReader inFromClient = new BufferedReader(
              new InputStreamReader(connectionSocket.getInputStream()));
        Log.d("TAG", "input stream found");
        Log.d("TAG", "getting output stream");
        DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
        Log.d("TAG", "output stream found");
        Log.d("TAG", "reading input stream");
        clientSentence = inFromClient.readLine();
        Log.d("TAG", "input stream read");
        Log.d("TAG", "input = " + clientSentence);
        Log.d("TAG", "writing output back to client");
        outToClient.writeBytes(clientSentence);
        Log.d("TAG", "output written back to client");
     }
  }
  catch ( IOException e )
  {
     e.printStackTrace();
  }
}

如果我首先初始化TCP服务器，则会得到输出

initTcpTestServer()
looking for socket

初始化TCP服务器，然后初始化TCP客户端后，我从服务器获取

getting input stream
input stream found
getting output stream
output stream found
reading input stream

和来自客户

initializing socket
socket initialized
getting output stream to server
found output stream to server
getting input stream from server
found input stream from server
writing sentence to server
sentence written
waiting for sentence response from server

因此看来套接字已建立，但是服务器在第

clientSentence = inFromClient.readLine();

而客户在

String serverResponse = inFromServer.readLine();

因为客户端已写入数据，但是服务器从未收到过数据，并且客户端正在挂起，等待服务器的响应。

Answer 1

谢谢可怕的袋熊。 在字符串末尾添加“ \\ n”会导致成功向服务器发送TCP消息。 通过在具有ADB的AVD虚拟路由器上配置端口转发，确实可以在Android仿真器上设置TCP服务器。 但是，我只在本地主机上对此进行了测试。