Android错误：读取bufferedreader后连接重置

Question

I'm using a method called registerDevice() in my android app code to send and receive specific data which contains multiple lines. But I keep getting this error:

W/System.err: java.net.SocketException: Connection reset

public void registerDevice(){
    final Handler handler = new Handler();
    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {

            try {
                Socket s = new Socket(gateway, 1234);
                OutputStream out = s.getOutputStream();
                PrintWriter output = new PrintWriter(out);
                BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                output.println("hello world\r\n");
                output.flush();
                StringBuffer stringBuffer = new StringBuffer("");
                String line = null;
                while ((line = input.readLine()) != null) {
                    stringBuffer.append(line);
                }
                final String st = line.substring(5);
                handler.post(new Runnable() {
                    @Override
                    public void run() {

                        if (st.trim().length() != 0)
                            Toast.makeText(getApplicationContext(),st,Toast.LENGTH_LONG).show();
                    }
                });

                output.close();
                out.close();
                s.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });

    thread.start();
}

UPDATE: I changed the code to this:

                Socket s = new Socket(gateway, 1234);
                OutputStream out = s.getOutputStream();
                PrintWriter output = new PrintWriter(out);
                BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                output.println("hello world\r\n");
                output.flush();
                final String st = input.readLine();
                handler.post(new Runnable() {
                    @Override
                    public void run() {

                        if (st.trim().length() != 0)
                            Toast.makeText(getApplicationContext(),"st",Toast.LENGTH_LONG).show();
                    }
                });

                output.close();
                out.close();
                s.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

I'm Still getting exceptions on the "final String st = input.readLine();"line. I am supposed to get a MAC address from the server and then the server closes the connection.I checked the server and there is nothing wrong with it, it closes the connection AFTER it sends me the MAC.

Answer 1

伙计们，我发现了问题，是我发送的数据包，我只是将 outout.println() 更改为 output.write()，所以现在服务器识别了我的命令并发送了我需要的数据，这导致我的输入流无法空和避免异常。