Question

我一直在尝试在Android Studio上创建一个客户端项目，该项目将连接到我在Python（Pycharm）中创建的服务器。至于使用的IP，我在服务器上输入了本地主机，在客户端输入了计算机服务器的IPV4。调试是通过手机本身而不是模拟器进行的。

当我尝试运行代码并使用相同的端口通过ipv4连接到服务器时，我的连接超时了。此时，调试器在尝试从服务器获取消息时卡在客户端类上 - “while（（bytesRead = inputStream.read（buffer））” - 在服务器上行时，代码未收到来自客户的任何消息，因此它一直停留在接收上。

如何解决此问题？

客户端代码： - 发生连接的地方

public class RequestAndAnswer extends AsyncTask<Void, Void, Void> {
private String dstAddress,result1;
private int dstPort;
private String response = "";
private String out;


RequestAndAnswer(String output)
{
    dstAddress = "1.5.0.66"; //fake ipv4
    out= output;
    dstPort= 8886;

}

@Override
protected Void doInBackground(Void... arg0) {

    Socket socket = null;

    try {
        socket = new Socket(dstAddress, dstPort);

     //send out to server
        DataOutputStream DOS = new DataOutputStream(socket.getOutputStream());
        DOS.writeUTF(out);

        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024);
        byte[] buffer = new byte[1024];

        int bytesRead;
        InputStream inputStream = socket.getInputStream();


        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byteArrayOutputStream.write(buffer, 0, bytesRead);
            response += byteArrayOutputStream.toString("UTF-8");
        }

    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        response = "UnknownHostException: " + e.toString();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        response = "IOException: " + e.toString();
    } finally {
        if (socket != null) {
            try {
                socket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    return null;
}

主要代码：

public void onClick(View v)
{
    if(v == loginButton)
    {

        String userNameString =  userName.getText().toString();
        String passwordString = password.getText().toString();

        String output ="100"+
        intToString(userNameString.length())
        +userNameString 
        + intToString(passwordString.length())
        +passwordString;

        RequestAndAnswer myClient = new RequestAndAnswer(output);

        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.HONEYCOMB)
            myClient.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        else
            myClient.execute();

        String answer="";

        do {
            answer = myClient.getResult();   /**In order to make sure that I
                                              will get my response after the
                                              communication started between
                                              the server and the client **/
        }
        while(answer.matches(""));


        if(answer.matches("1100"))
        {
            Intent i = new  Intent(this,Computer_choosing_selection_activity.class);
            i.putExtra("username",userNameString);
            startActivity(i);
            finish();
        }
        else if(answer.matches("1101"))
            {
            String error = "The username and password do not match";
            errorText.setTextColor(Color.RED);
            errorText.setText(error);
        }
        else
        {
            String error = "Could not connect";
            errorText.setTextColor(Color.RED);
            errorText.setText(error);
        }

    }

AndroidManifest.XML包含以下几行 -

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

服务器代码： - 在python中

import socket
import sys

HOST = '127.0.0.1'   # Symbolic name, meaning all available interfaces
PORT = 8886 # Arbitrary non-privileged port

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'

#Bind socket to local host and port
try:
    s.bind((HOST, PORT))
except socket.error as msg:
    print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
    sys.exit()

print 'Socket bind complete'

#Start listening on socket
s.listen(10)
print 'Socket now listening'

#now keep talking with the client
while 1:
    #wait to accept a connection - blocking call
    conn, addr = s.accept()
    print 'Connected with ' + addr[0] + ':' + str(addr[1])
    data = s.recv(1024)
    number = data.substr(0,3)

    if(number == "100"):
        data = data[4:]
        len=data[0:3]
        data=data[2:]
        name = data[:int(len)]
        data = data[int(len):]
        len=data[0:3]
        data=data[2:]
        password = data[:int(len)]
        if((name == "Tod") and (password == "Aa123456")):
            conn.send("1100")
        else:
            conn.send("1101")

s.close()

编辑：我在服务器中将地址更改为IPV4而不是本地127.0.0.1并且我设法连接虽然它之前给了我以下错误

“Socket.error：[Errno 10057]请求发送或接收数据被拒绝，因为该组件未连接到套接字并提供了一个地址（通过调用sendto发送数据套接字单元时）”

在此消息之后，我得到一个“已连接”的输出，程序关闭。

为什么我不能与我的服务器通信？

0 个答案: