带有Java EE 7 WebSocket的嵌入式tomcat

Question

i have this simple websocket

@ServerEndpoint(
        value="/data",
        encoders = {WsCommandEncoder.class},
        decoders = {WsCommandDecoder.class}
)
public class DataWebSocket {
   //...impl
}

and i initialize my embedded tomcat in the main function

public static void main(String[] args) throws Exception{


    Tomcat tomcat = new Tomcat();
    tomcat.setPort(6000);

    //how do i add the websocket to my tomcat instance?

    String webDir = "/web";
    tomcat.addWebapp("/", new File(webDir).getAbsolutePath());
    System.out.println("configuring app with basedir: " + new File("./" + webDir).getAbsolutePath());
    tomcat.start();
    tomcat.getServer().await();


}

i have never used embedded tomcat before, usually there was the web.xml but i dont want to use webxml and i want to add the end point directly in code, so how do i add the websocket to my tomcat instance?

i am using Tomcat 8.0.9 and java ee 7

Answer 1

Take a look at the source code for the Tomcat unit tests - particularly those for WebSocket. There are lots of examples of adding endpoints via code.

Answer 2

Here is a complete example. straight forward once you get the dependencies right.

https://github.com/robmayhew/embedded-tomcat-websocket-example