Java

Duplicate Python websockets

See more WebSocket Examples

Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // In Python, the following line of code does more than just connect:
    // 
    //      websockets.connect('ws://192.168.1.35/websocket')
    // 
    // It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
    // But this URI begins with just "ws:/", so no TLS.

    // Also, after connecting, a GET request is sent to the /websocket endpoint.
    // In summary, the websockets.connect function is establishing the connection and it sends a GET request.

    // First establish the connection.
    // No TLS, use the default HTTP port 80.
    CkRest rest = new CkRest();
    success = rest.Connect("192.168.1.35",80,false,false);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    CkWebSocket ws = new CkWebSocket();

    // Tell the WebSocket to use this connection.
    success = ws.UseConnection(rest);
    if (success != true) {
        System.out.println(ws.lastErrorText());
        return;
        }

    // Add the standard WebSocket open handshake headers that will be needed.
    // (This adds the required HTTP request headers to the rest object.)
    ws.AddClientHeaders();

    // Now send the GET request to /websockets.
    String responseBody = rest.fullRequestNoBody("GET","/websockets");
    if (rest.get_LastMethodSuccess() != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // If successful, the HTTP response status code should be 101,
    // and the response body will be empty. (If it failed, we'll have a look
    // at the response body..)
    int statusCode = rest.get_ResponseStatusCode();
    System.out.println("Response status code: " + statusCode);

    if (statusCode != 101) {
        System.out.println(responseBody);
        System.out.println("-- Failed because of unexpected response status code.");
        return;
        }

    // We have the expected 101 response, so let's now validate the 
    // contents of the response.
    success = ws.ValidateServerHandshake();
    if (success != true) {
        System.out.println(ws.lastErrorText());
        return;
        }

    System.out.println("WebSocket connection successful.");

    // The application may now begin sending and receiving frames on the WebSocket connection.

    // The 1st frame sent by the Python snippet is:
    // 
    //     websocket.send("http.controller_login:username=xxx&password=xxxxx")
    // 

    // Send the same using Chilkat, and get the response.
    boolean finalFrame = true;
    success = ws.SendFrame("http.controller_login:username=xxx&password=xxxxx",finalFrame);
    if (success != true) {
        System.out.println(ws.lastErrorText());
        return;
        }

    // Read an incoming frame.
    success = ws.ReadFrame();
    if (success != true) {
        System.out.println("Failed to receive a frame");
        System.out.println("ReadFrame fail reason = " + ws.get_ReadFrameFailReason());
        System.out.println(ws.lastErrorText());
        return;
        }

    // Show the string that was received.
    String receivedStr = ws.getFrameData();
    System.out.println("Received: " + receivedStr);

    // Continue with whatever additional communications are desired...
    // ....
    // 
  }
}