[英]I'm embedding jetty in my app to communicate over websockets, how can define different paths?
我有一個Java服務器,它需要與Web客戶端實時通信。 為此,我要嵌入Jetty9。Jetty將充當Web客戶端以及websocket服務器的靜態Web服務器。 根據我在網上找到的示例,靜態頁面處理程序和WS處理程序都在同一路徑下使用。 我不清楚如何從兩個不同的途徑為他們服務。 我將不勝感激任何指針。 這是我的代碼
public static void main(String ...args) throws Exception {
Server server = new Server(8080);
ResourceHandler resource_handler = new ResourceHandler();
resource_handler.setDirectoriesListed(true);
resource_handler.setWelcomeFiles(new String[]{ "index.html" });
resource_handler.setResourceBase("./webapp");
WebSocketHandler wsHandler = new WebSocketHandler() {
@Override
public void configure(WebSocketServletFactory factory) {
factory.register(MyWebSocketHandler.class);
}
};
HandlerList handlers = new HandlerList();
handlers.setHandlers(new Handler[] { resource_handler,wsHandler, new DefaultHandler() });
server.setHandler(handlers);
server.start();
server.join();
}
使用ContextHandlerCollection
並將WebSockets
包裝在ContextHandler
對象中。
ContextHandlerCollection contexts = new ContextHandlerCollection();
contexts.addHandler(new ContextHandler(wsFooHandler, "/foo"));
contexts.addHandler(new ContextHandler(wsBarHandler, "/bar"));
HandlerList handlers = new HandlerList();
handlers.setHandlers(new Handler[] { resource_handler, contexts, new DefaultHandler() });
但是,將ServletContextHandler
與WebSocketUpgradeFilter
及其addMapping
可以使您以更強大的方式通過websocket創建來控制事物。
例:
public static void main(String... args) throws Exception
{
Server server = new Server(8080);
ServletContextHandler context = new ServletContextHandler();
context.setContextPath("/");
context.setWelcomeFiles(new String[] { "index.html" });
WebSocketUpgradeFilter filter = WebSocketUpgradeFilter.configureContext(context);
filter.addMapping(new ServletPathSpec("/foo/*"),new SingleWebSocketCreator(FooSocket.class));
filter.addMapping(new ServletPathSpec("/bar/*"),new SingleWebSocketCreator(BarSocket.class));
filter.addMapping(new ServletPathSpec("/*.ws"),new SingleWebSocketCreator(WsTypeSocket.class));
filter.addMapping(new RegexPathSpec("/chat/room/[a-zA-z_]*/public"),new SingleWebSocketCreator(ChatSocket.class));
// add your own non-websocket servlets
context.addServlet(HelloServlet.class,"/hello");
// Lastly, the default servlet for root content (serves up static content)
// It is important that this is last.
ServletHolder holderPwd = new ServletHolder("default", DefaultServlet.class);
holderPwd.setInitParameter("resourceBase","./webapp");
holderPwd.setInitParameter("dirAllowed","true");
context.addServlet(holderPwd,"/");
HandlerList handlers = new HandlerList();
handlers.setHandlers(new Handler[] { context, new DefaultHandler() });
server.setHandler(handlers);
server.start();
server.join();
}
和意外遺漏的SingleWebSocketCreator ...
public class SingleWebSocketCreator implements WebSocketCreator
{
private Class<?> endpoint;
public SingleWebSocketCreator(Class<?> websocketEndpoint)
{
this.endpoint = websocketEndpoint;
}
@Override
public Object createWebSocket(ServletUpgradeRequest req, ServletUpgradeResponse resp)
{
try
{
// new instance of endpoint for each upgrade
return endpoint.newInstance();
}
catch (InstantiationException | IllegalAccessException e)
{
// failure to instantiate can flow out
throw new RuntimeException(e);
}
}
}
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