Android--WebSocket
版权声明：本文为博主原创文章，转载请标明出处。 https://blog.csdn.net/chaoyu168/article/details/79625691 WebSocket 是一种双向通信协议，在建立连接后，WebSocket服务器和 Browser/Client Agent 都能主动的向对方发送或接收数据，就像 Socket一样。它类似TCP长连接，但是WebSocket使用的是ws和wss两种通信协议，所以这是完全不同于HTTP的一种网络协议，尽管它也是默认使用80和443端口。WebSocket的连接包括第一步握手和第二步数据交换。在通过WebSocket开始双向通信时，首先需要与服务器建立连接。而用于建立连接的请求是由客户端发起，服务器端将会确认连接对象的源以及协议，并发送连接许可的响应。在发送了响应之后，浏览器会将该连接升级为WebSocket。握手成功之后就建立起长连接，直到服务器或者浏览器某一方主动断开连接。客户端发起连接非常简单，只需要一句Javascript即可实现： varws=newWebSocket('ws://www.example.com/bar') 然后就是第二步，浏览器和服务器之间双向数据发送了。Nodejs是即时通信应用很完美的开发语言（此处不是为了引起撕逼），很自然地，Nodejs本身也比较完善地实现了WebSocket相关API。客户端（浏览器）发送消息到服务器最简单的方法就是通过调用socket对象的send()方法，然后Node服务器通过注册message事件进行监听，当然服务器send过来的消息也是通过对客户端message事件进行捕捉，从而实现双向的数据交互。这两者之间交换的数据可以是字符串、ArrayBuffer（二进制数据）或者Blob，所以WebSocket也是可以传输文件的。也可以通过广播事件将消息发送到所有连接到服务器的客户端。 使用框架：Java-WebSocket Gradle To use Gradle add the maven central repository to your repositories list : mavenCentral() Then you can just add the latest version to your build. compile "org.java-websocket:Java-WebSocket:1.3.8" Client Example import java.net.URI; import java.net.URISyntaxException; import org.java_websocket.client.WebSocketClient; import org.java_websocket.drafts.Draft; import org.java_websocket.drafts.Draft_6455; import org.java_websocket.handshake.ServerHandshake; public class EmptyClient extends WebSocketClient { public EmptyClient(URI serverUri, Draft draft) { super(serverUri, draft); } public EmptyClient(URI serverURI) { super(serverURI); } @Override public void onOpen(ServerHandshake handshakedata) { send("Hello, it is me. Mario :)"); System.out.println("new connection opened"); } @Override public void onClose(int code, String reason, boolean remote) { System.out.println("closed with exit code " + code + " additional info: " + reason); } @Override public void onMessage(String message) { System.out.println("received message: " + message); } @Override public void onMessage(ByteBuffer message) { System.out.println("received ByteBuffer"); } @Override public void onError(Exception ex) { System.err.println("an error occurred:" + ex); } public static void main(String[] args) throws URISyntaxException { WebSocketClient client = new EmptyClient(new URI("ws://localhost:8887")); client.connect(); } } Server Example import java.net.InetSocketAddress; import org.java_websocket.WebSocket; import org.java_websocket.handshake.ClientHandshake; import org.java_websocket.server.WebSocketServer; public class SimpleServer extends WebSocketServer { public SimpleServer(InetSocketAddress address) { super(address); } @Override public void onOpen(WebSocket conn, ClientHandshake handshake) { conn.send("Welcome to the server!"); //This method sends a message to the new client broadcast( "new connection: " + handshake.getResourceDescriptor() ); //This method sends a message to all clients connected System.out.println("new connection to " + conn.getRemoteSocketAddress()); } @Override public void onClose(WebSocket conn, int code, String reason, boolean remote) { System.out.println("closed " + conn.getRemoteSocketAddress() + " with exit code " + code + " additional info: " + reason); } @Override public void onMessage(WebSocket conn, String message) { System.out.println("received message from " + conn.getRemoteSocketAddress() + ": " + message); } @Override public void onMessage( WebSocket conn, ByteBuffer message ) { System.out.println("received ByteBuffer from " + conn.getRemoteSocketAddress()); } @Override public void onError(WebSocket conn, Exception ex) { System.err.println("an error occured on connection " + conn.getRemoteSocketAddress() + ":" + ex); } @Override public void onStart() { System.out.println("server started successfully"); } public static void main(String[] args) { String host = "localhost"; int port = 8887; WebSocketServer server = new SimpleServer(new InetSocketAddress(host, port)); server.run(); } } 还有一个封装框架挺好：RxWebSocket how to use 添加依赖: 在项目module下gradle加入: //本项目 compile 'com.dhh:websocket:1.5.0' init //if you want to use your okhttpClient OkHttpClient yourClient = new OkHttpClient(); RxWebSocketUtil.getInstance().setClient(yourClient); // show log,default false RxWebSocketUtil.getInstance().setShowLog(true); WSS support,其实就是设置okhttp的SSL,请参照okhttp的设置 //wss support RxWebSocketUtil.getInstance().setSSLSocketFactory(yourSSlSocketFactory,yourX509TrustManager); RxWebSocketUtil.getInstance().getWebSocket("wss://..."); //or OkHttpClient client = new OkHttpClient.Builder() .sslSocketFactory(yourSSlSocketFactory, yourX509TrustManager) //other config... .build(); RxWebSocketUtil.getInstance().setClient(client); open WebSocket RxWebSocketUtil.getInstance().getWebSocketInfo(url) .subscribe(new Action1<WebSocketInfo>() { @Override public void call(WebSocketInfo webSocketInfo) { mWebSocket = webSocketInfo.getWebSocket(); Log.d("MainActivity", webSocketInfo.getString()); Log.d("MainActivity", "webSocketInfo.getByteString():" + webSocketInfo.getByteString()); } }); mWebSocket.send("hello word"); // use WebSocketSubscriber RxWebSocketUtil.getInstance().getWebSocketInfo("ws://10.7.5.88:8089") //RxLifecycle : https://github.com/dhhAndroid/RxLifecycle .compose(RxLifecycle.with(this).<WebSocketInfo>bindOnDestroy()) .subscribe(new WebSocketSubscriber() { @Override public void onOpen(@NonNull WebSocket webSocket) { } @Override public void onMessage(@NonNull String text) { } @Override public void onMessage(@NonNull ByteString bytes) { } }); // use WebSokcetAction1 RxWebSocketUtil.getInstance().getWebSocketInfo("ws://10.7.5.88:8089") //RxLifecycle : https://github.com/dhhAndroid/RxLifecycle .compose(RxLifecycle.with(this).<WebSocketInfo>bindOnDestroy()) .subscribe(new WebSokcetAction1() { @Override public void onOpen(@NonNull WebSocket webSocket) { } @Override public void onMessage(@NonNull String text) { } @Override public void onMessage(@NonNull ByteString bytes) { } }); //get StringMsg RxWebSocketUtil.getInstance().getWebSocketString(url) .subscribe(new Action1<String>() { @Override public void call(String s) { } }); // get ByteString RxWebSocketUtil.getInstance().getWebSocketByteString(url) .subscribe(new Action1<ByteString>() { @Override public void call(ByteString byteString) { } }); //get WebSocket RxWebSocketUtil.getInstance().getWebSocket(url) .subscribe(new Action1<WebSocket>() { @Override public void call(WebSocket webSocket) { } }); //with timeout RxWebSocketUtil.getInstance().getWebSocketInfo(url, 10, TimeUnit.SECONDS) .subscribe(new Action1<WebSocketInfo>() { @Override public void call(WebSocketInfo webSocketInfo) { } }); // Rxbinding RxView.clicks(centect) .flatMap(new Func1<Void, Observable<String>>() { @Override public Observable<String> call(Void aVoid) { return RxWebSocketUtil.getInstance().getWebSocketString(url); } }) .subscribe(new Action1<String>() { @Override public void call(String s) { //the s !=null Log.d("MainActivity", s); textview.setText(Html.fromHtml(s)); } }); 发送消息 //用WebSocket的引用直接发 mWebSocket.send("hello word"); //url 对应的WebSocket已经打开可以这样send,否则报错 RxWebSocketUtil.getInstance().send(url, "hello"); RxWebSocketUtil.getInstance().send(url, ByteString.EMPTY); //异步发送,若WebSocket已经打开,直接发送,若没有打开,打开一个WebSocket发送完数据,直接关闭. RxWebSocketUtil.getInstance().asyncSend(url, "hello"); RxWebSocketUtil.getInstance().asyncSend(url, ByteString.EMPTY); 注销 RxJava的注销方式,就可以取消订阅. 项目里的demo里,简单实现了一个Lifecycle.仅供参考. Subscription subscription = RxWebSocketUtil.getInstance().getWebSocketString("ws://sdfs").subscribe(); //注销 if(subscription!=null&&!subscription.isUnsubscribed()) { subscription.unsubscribe(); }
