我目前正在开发基于GPS的项目,我目前正在使用凌空从网络接收数据,但最近他们计划使用实时数据升级服务。因此,Web开发人员使用websocket对服务器进行了编程,对于浏览器应用程序,他们说,他们使用stomp.js协议从服务器检索数据。他们要求我从他们的服务器(实时数据)中检索数据,但我不知道什么是从websocket获取实时数据的最佳方法。我从github https://github.com/NaikSoftware/StompProtocolAndroid找到了一个例子,但这对我来说还不够学习,在互联网上使用stomp的文档是不够的。我希望在android中有更好的实现。
如有任何帮助和建议,将不胜感激。请不要提及我的firebase,因为我已经提到过firebase,他们拒绝使用它。请伙计们帮助我,建议我或者给我一个很好的例子来简单地使用排球从websocket服务器检索数据。
答案 0 :(得分:6)
我的回答是基于这个问题的评论。没有关于这个问题的足够信息,所以我正在为您的问题编写2个解决方案
解决方案1 - 不使用Stomp Implementation- Simple websocket
这是一个简单的Websocket实现。为此,您可以使用koush/AndroidAsync库
将此项目实施到您的项目中
dependencies {
compile 'com.koushikdutta.async:androidasync:2.+'
}
然后连接到Websocket服务器
String url="ws://172.17.1.54:8000/";
AsyncHttpClient.getDefaultInstance().websocket(url, "my-protocol", new WebSocketConnectCallback() {
@Override
public void onCompleted(Exception ex, WebSocket webSocket) {
if (ex != null) {
ex.printStackTrace();
return;
}
webSocket.setStringCallback(new StringCallback() {
public void onStringAvailable(String s) {
System.out.println("I got a string: " + s);
}
});
webSocket.setDataCallback(new DataCallback() {
public void onDataAvailable(DataEmitter emitter, ByteBufferList byteBufferList) {
System.out.println("I got some bytes!");
// note that this data has been read
byteBufferList.recycle();
}
});
}
});
这里的setStringCallback()& setDataCallback()将收到您的实时更新。
您也可以使用codebutler/android-websockets库。
解决方案2:使用Stomp实现
为此,您可以使用Gozirra java库来解决此问题。 您可以download客户端库。然后将其放入libs文件夹。
用于连接服务器
Client c = new Client("server url", port, "login", "password");
为更新创建一个监听器
Listener listener=new Listener() {
@Override
public void message(Map map, String s) {
//Do your stuff
}
};
然后订阅您的主题消息
c.subscribe("foo-channel", listener);
如果您想取消订阅,可以使用以下代码
c.unsubscribe("foo-channel", listener); // Unsubscribe only one listener
或
c.unsubscribe("foo-channel"); // Unsubscribe all listeners
断开客户端
c.disconnect();
我没有使用真正的服务器对此进行测试。但我认为这样可行。请告诉我是否能解决您的问题
解决方案3
当你提到图书馆https://github.com/NaikSoftware/StompProtocolAndroid时 你可以用它。简化版本如下
将maven链接添加到项目级别gradle
repositories {
maven { url "https://jitpack.io" }
}
在模块级gradle中添加依赖项
implementation 'com.github.NaikSoftware:StompProtocolAndroid:1.1.5'
implementation 'org.java-websocket:Java-WebSocket:1.3.0'
然后使用以下代码获取消息
StompClient mStompClient = Stomp.over(WebSocket.class, "ws://10.0.2.2:5000/");
mStompClient.topic("/topic/general").subscribe(new Action1<StompMessage>() {
@Override
public void call(StompMessage stompMessage) {
Log.e(TAG, stompMessage.getPayload());
}
});
mStompClient.lifecycle().subscribe(new Action1<LifecycleEvent>() {
@Override
public void call(LifecycleEvent lifecycleEvent) {
switch (lifecycleEvent.getType()) {
case OPENED:
Log.e(TAG, "Stomp connection opened");
break;
case ERROR:
Log.e(TAG, "Error", lifecycleEvent.getException());
break;
case CLOSED:
Log.e(TAG, "Stomp connection closed");
break;
}
}
});
mStompClient.connect();
答案 1 :(得分:5)
使用Square的OkHttp库。
将此依赖项添加到构建gradle
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
使用以下课程来收听webshockts
public class SocketListner extends WebSocketListener {
private Mediator mediator;
private static final int CLOSURE_STATUS = 1000;
private WebSocket webSocket = null;
public SocketListner(Mediator mediator) {
this.mediator = mediator;
}
@Override
public void onOpen(WebSocket webSocket, Response response) {
super.onOpen(webSocket, response);
this.webSocket = webSocket;
mediator.onConnected(webSocket, response);
}
public void sendMsg(String msg) {
if (webSocket != null)
webSocket.send(msg);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, @Nullable Response response) {
mediator.onFailure(webSocket, t.getLocalizedMessage());
AppCons.printTag("Failure :", t.getMessage());
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
mediator.closingOrClosed(true, webSocket, reason, code);
AppCons.printTag("Closed :", reason);
}
@Override
public void onClosing(WebSocket webSocket, int code, String reason) {
mediator.closingOrClosed(false, webSocket, reason, code);
AppCons.printTag("Closing :", reason);
}
@Override
public void onMessage(WebSocket webSocket, String text) {
mediator.getMessage(text);
}
public interface Mediator {
void onConnected(WebSocket webSocket, Response response);
void getMessage(String msg);
void onFailure(WebSocket webSocket, String reason);
void closingOrClosed(boolean isClosed, WebSocket webSocket, String reason, int code);
}
public WebSocket getWebSocket() {
return webSocket;
}
}
使用以下代码通过shocket
访问数据private OkHttpClient client;
private SocketListner listner;
private void startShocketConnection() {
client = new OkHttpClient.Builder().readTimeout(3, TimeUnit.SECONDS).build();
listner = new SocketListner(new SocketListner.Mediator() {
@Override
public void onConnected(WebSocket webSocket, Response response) {
Log.d("Connected :", response.toString());
}
@Override
public void getMessage(String msg) {
try {
Log.d("Received", msg);
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(WebSocket webSocket, String reason) {
//reconnect when failure with server
Log.d("Failure :", reason);
}
@Override
public void closingOrClosed(boolean isClosed, WebSocket webSocket, String reason, int code) {
Log.d("ClosingOrClosed :", isClosed ? "Closed" : "closing");
}
});
Request request = new Request.Builder()
.url("your shocket url")
.build();
client.newWebSocket(request, listner);
}
private void closeSocket() {
try {
listner.getWebSocket().cancel();
listner.getWebSocket().close(1000, "Good bye !");
if ((response != null)) {
client.dispatcher().executorService().shutdown();
client.connectionPool().evictAll();
response.close();
}
} catch (Exception e) {
e.printStackTrace();
}
response = null;
}