Java中的简单Websocket客户端 – 连接问题
我正在尝试用Java编写一个简单的websocket客户端来连接第三方WebSocket服务器（我无法访问服务器）。
我可以在浏览器中使用javascript连接和与websocket服务器通信，但是当我尝试使用Java客户端做同样的事情时，它无法连接。
使用相同的Java客户端，我可以连接到我运行的tomcat websocket服务器，所以我认为这是客户端和服务器之间的某种兼容性问题。 （我正在使用Tomcat 7.0.56库作为websocket客户端）。
这是我得到的错误……
错误
javax.websocket.DeploymentException: The HTTP request to initiate the WebSocket connection failed at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWebSocketContainer.java:344) at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWebSocketContainer.java:166) at com.cvr.instant.ws.WebSocketClient.Connect(WebSocketClient.java:44) at com.cvr.instant.ws.TestWS.Start(TestWS.java:17) at com.cvr.instant.ws.TestWS.main(TestWS.java:37) Caused by: java.io.EOFException at org.apache.tomcat.websocket.WsWebSocketContainer.processResponse(WsWebSocketContainer.java:595) at org.apache.tomcat.websocket.WsWebSocketContainer.connectToServer(WsWebSocketContainer.java:317) ... 4 more WebSocketClient
import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import javax.websocket.ClientEndpoint; import javax.websocket.CloseReason; import javax.websocket.ContainerProvider; import javax.websocket.DeploymentException; import javax.websocket.OnClose; import javax.websocket.OnMessage; import javax.websocket.OnOpen; import javax.websocket.Session; import javax.websocket.WebSocketContainer; @ClientEndpoint public class WebSocketClient { protected WebSocketContainer container; protected Session userSession = null; public WebSocketClient() { container = ContainerProvider.getWebSocketContainer(); } public void Connect(String sServer) { try { userSession = container.connectToServer(this, new URI(sServer)); } catch (DeploymentException | URISyntaxException | IOException e) { e.printStackTrace(); } } public void SendMessage(String sMsg) throws IOException { userSession.getBasicRemote().sendText(sMsg); } @OnOpen public void onOpen(Session session) { System.out.println("Connected"); } @OnClose public void onClose(Session session, CloseReason closeReason) { } @OnMessage public void onMessage(Session session, String msg) { System.out.println(msg); } public void Disconnect() throws IOException { userSession.close(); } }
运行客户端
import java.io.IOException; public class TestWS { public WebSocketClient wsc; public TestWS() { } public void Start() throws InterruptedException, IOException { wsc = new WebSocketClient(); wsc.callback = this; wsc.Connect("ws://192.168.0.25:9000"); Thread.sleep(1000); wsc.Disconnect(); } public static void main(String[] args) throws InterruptedException, IOException { TestWS t = new TestWS(); t.Start(); Thread.sleep(1000); } }
我对websocket客户端非常陌生（对于一般的websockets也是新手）。 任何你能提供的帮助将不胜感激！
我发现了这个问题 – 当从java客户端运行时，ws地址在它的末尾需要一个’/’。
JavaScript ws：//192.168.0.25：9000
Java ws：//192.168.0.25：9000 /
不确定为什么在Java中需要它 – 但它解决了这个问题……