我的Android应用程序通过socket连接到服务器,socket以node.js编码。当它在前台停留15分钟时,它会丢失与服务器的连接。以下是将sockt连接到服务器的代码
public void connect() {
this.connectionStatus = CONNECT_STATUS_CONNECTING;
Log.v(AppConstants.DEBUG_TAG, userId + " : Connecting to Server");
if (mThread != null && mThread.isAlive()) {
return;
}
mThread = new Thread(new Runnable() {
@Override
public void run() {
try {
Log.v(AppConstants.DEBUG_TAG, userId + " : Thread Action Started");
String secret = createSecret();
int port = (mURI.getPort() != -1) ? mURI.getPort() : (mURI.getScheme().equals("wss") ? 443 : 80);
String path = TextUtils.isEmpty(mURI.getPath()) ? "/" : mURI.getPath();
if (!TextUtils.isEmpty(mURI.getQuery())) {
path += "?" + mURI.getQuery();
}
String originScheme = mURI.getScheme().equals("wss") ? "https" : "http";
URI origin = new URI(originScheme, "//" + mURI.getHost(), null);
SocketFactory factory = mURI.getScheme().equals("wss") ? getSSLSocketFactory() : SocketFactory.getDefault();
mSocket = factory.createSocket(mURI.getHost(), port);
mSocket.setKeepAlive(true);
PrintWriter out = new PrintWriter(mSocket.getOutputStream());
out.print("GET " + path + " HTTP/1.1\r\n");
out.print("Upgrade: websocket\r\n");
out.print("Connection: Upgrade\r\n");
out.print("Host: " + mURI.getHost() + "\r\n");
out.print("Origin: " + origin.toString() + "\r\n");
out.print("Sec-WebSocket-Key: " + secret + "\r\n");
out.print("Sec-WebSocket-Version: 13\r\n");
if (mExtraHeaders != null) {
for (NameValuePair pair : mExtraHeaders) {
out.print(String.format("%s: %s\r\n", pair.getName(), pair.getValue()));
}
}
out.print("\r\n");
out.flush();
HybiParser.HappyDataInputStream stream = new HybiParser.HappyDataInputStream(mSocket.getInputStream());
// Read HTTP response status line.
StatusLine statusLine = parseStatusLine(readLine(stream));
if (statusLine == null) {
Log.v(AppConstants.DEBUG_TAG, "Received no reply from server.");
throw new HttpException("Received no reply from server.");
} else if (statusLine.getStatusCode() != HttpStatus.SC_SWITCHING_PROTOCOLS) {
throw new HttpResponseException(statusLine.getStatusCode(), statusLine.getReasonPhrase());
}
// Read HTTP response headers.
String line;
boolean validated = false;
while (!TextUtils.isEmpty(line = readLine(stream))) {
Header header = parseHeader(line);
if (header.getName().equals("Sec-WebSocket-Accept")) {
String expected = createSecretValidation(secret);
String actual = header.getValue().trim();
if (!expected.equals(actual)) {
Log.v(AppConstants.DEBUG_TAG, "Bad Sec-WebSocket-Accept header value.");
throw new HttpException("Bad Sec-WebSocket-Accept header value.");
}
validated = true;
}
}
if (!validated) {
Log.v(AppConstants.DEBUG_TAG, "No Sec-WebSocket-Accept header.");
throw new HttpException("No Sec-WebSocket-Accept header.");
}
onConnect();
Log.v(AppConstants.DEBUG_TAG, userId + " : Thread should be connected by now");
// Now decode websocket frames.
mParser.start(stream);
} catch (EOFException ex) {
Log.d(AppConstants.DEBUG_TAG, "WebSocket EOF!", ex);
onDisconnect(0, "EOF");
} catch (SSLException ex) {
// Connection reset by peer
Log.d(AppConstants.DEBUG_TAG, "Websocket SSL error!", ex);
onDisconnect(0, "SSL");
} catch (Exception ex) {
onError(ex);
}
}
});
Log.v(AppConstants.DEBUG_TAG, userId + " : Thread about to be started");
mThread.start();
}
anu解决这个问题的方法?
答案 0 :(得分:6)
经过Google搜索后,我找到了解决这个问题的方法。为套接字连接添加超时。
mSocket.setSoTimeout(10000);
如果没有任何响应,10秒钟它将抛出SocketTimeoutException并在此异常的catch中关闭连接(如果存在),然后再次连接。
catch (SocketTimeoutException e){
if(mSocket.isConnected()){
disconnect();
}
connect();
}
答案 1 :(得分:0)
这是一个简单的示例,显示了如何设置timeout on a java socket:
sockAdr = new InetSocketAddress(SERVER_HOSTNAME, SERVER_PORT);
socket = new Socket();
timeout = 5000;
socket.connect(sockAdr, timeout);
reader = new BufferedReader(new InputStreamReader(socket.getInputStream());
while ((data = reader.readLine())!=null)
log.e(TAG, "received -> " + data);
log.e(TAG, "Socket closed !");