JNIEXPORT void JNICALL Java_com_example_hellojni_Native_nativeStartTcpServer (JNIEnv *env, jobject obj, jint port) { // Construct a new TCP socket. int serverSocket = NewTcpSocket(env, obj); if (NULL == env->ExceptionOccurred()) { // Bind socket to a port number BindSocketToPort(env, obj, serverSocket, (unsigned short) port); if (NULL != env->ExceptionOccurred()) goto exit; // If random port number is requested if (0 == port) { // Get the port number socket is currently binded GetSocketPort(env, obj, serverSocket); if (NULL != env->ExceptionOccurred()) goto exit; } // Listen on socket with a backlog of 4 pending connections ListenOnSocket(env, obj, serverSocket, 4); if (NULL != env->ExceptionOccurred()) goto exit; // Accept a client connection on socket int clientSocket = AcceptOnSocket(env, obj, serverSocket); if (NULL != env->ExceptionOccurred()) goto exit; char buffer[MAX_BUFFER_SIZE]; ssize_t recvSize; ssize_t sentSize; // Receive and send back the data while (1) { // Receive from the socket recvSize = ReceiveFromSocket(env, obj, clientSocket, buffer, MAX_BUFFER_SIZE); if ((0 == recvSize) || (NULL != env->ExceptionOccurred())) break; // Send to the socket char prefix[] = "Server: "; char toSend[MAX_BUFFER_SIZE + strlen(prefix)]; strcpy(toSend, prefix); strcat(toSend, buffer); sentSize = SendToSocket(env, obj, clientSocket, toSend, (size_t) strlen(toSend)); if ((0 == sentSize) || (NULL != env->ExceptionOccurred())) break; } // Close the client socket close(clientSocket); } exit: if (serverSocket > 0) { close(serverSocket); } }
void Java_com_apress_echo_EchoServerActivity_nativeStartTcpServer( JNIEnv* env, jobject obj, jint port) { // Construct a new TCP socket. int serverSocket = NewTcpSocket(env, obj); if (NULL == env->ExceptionOccurred()) { // Bind socket to a port number BindSocketToPort(env, obj, serverSocket, (unsigned short) port); if (NULL != env->ExceptionOccurred()) goto exit; // If random port number is requested if (0 == port) { // Get the port number socket is currently binded GetSocketPort(env, obj, serverSocket); if (NULL != env->ExceptionOccurred()) goto exit; } // Listen on socket with a backlog of 4 pending connections ListenOnSocket(env, obj, serverSocket, 4); if (NULL != env->ExceptionOccurred()) goto exit; // Accept a client connection on socket int clientSocket = AcceptOnSocket(env, obj, serverSocket); if (NULL != env->ExceptionOccurred()) goto exit; char buffer[MAX_BUFFER_SIZE]; ssize_t recvSize; ssize_t sentSize; // Receive and send back the data while (1) { // Receive from the socket recvSize = ReceiveFromSocket(env, obj, clientSocket, buffer, MAX_BUFFER_SIZE); if ((0 == recvSize) || (NULL != env->ExceptionOccurred())) break; // Send to the socket sentSize = SendToSocket(env, obj, clientSocket, buffer, (size_t) recvSize); if ((0 == sentSize) || (NULL != env->ExceptionOccurred())) break; } // Close the client socket close(clientSocket); } exit: if (serverSocket > 0) { close(serverSocket); } }
JNIEXPORT void JNICALL Java_com_eric_ndkapp_ServerActivity_nativeStartServer (JNIEnv * env, jobject obj, jstring ip, jint port, jstring message) { // Construct a new TCP socket. if (serverSocket > 0) { LogMessage(env, obj, "Server is running"); return; } serverSocket = NewTcpSocket(env, obj); if (NULL == env->ExceptionOccurred()) { // Get IP address as C string const char* ipAddress = env->GetStringUTFChars(ip, NULL); if (NULL == ipAddress) goto exit; // Bind socket to a port number BindSocketToPort(env, obj, serverSocket, ipAddress, (unsigned short) port); // Release the IP address env->ReleaseStringUTFChars(ip, ipAddress); if (NULL != env->ExceptionOccurred()) goto exit; // Listen on socket with a backlog of 4 pending connections ListenOnSocket(env, obj, serverSocket, 4); if (NULL != env->ExceptionOccurred()) goto exit; // Accept a client connection on socket int socket = 0; if (clientSocket == 0) { clientSocket = AcceptOnSocket(env, obj, serverSocket); } if (env->ExceptionOccurred() == NULL) { // Receive and send back the data char buffer[MAX_BUFFER_SIZE]; ssize_t recvSize; ssize_t sentSize; // Get message as C string const char* messageText = env->GetStringUTFChars(message, NULL); if (NULL == messageText) goto exit; // Get the message size jsize messageSize = env->GetStringUTFLength(message); // Send to the socket sentSize = SendToSocket(env, obj, clientSocket, messageText, messageSize); // Release the message text env->ReleaseStringUTFChars(message, messageText); while ((recvSize = ReceiveFromSocket(env, obj, clientSocket, buffer, MAX_BUFFER_SIZE)) > 0) { } } } exit: return; }