Example usage for javax.servlet.http PushBuilder getClass

Introduction

In this page you can find the example usage for javax.servlet.http PushBuilder getClass.

Prototype

@HotSpotIntrinsicCandidate
public final native Class<?> getClass();

Source Link

Document

Returns the runtime class of this Object .

Usage

From source file:nl.ordina.jtech.http2.java8.server.tomcat.SimpleImagePush.java

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("request path: " + req.getContextPath() + " >> " + req.getServletPath() + " >> "
            + req.getPathTranslated());/*from   w  ww. java2 s.  co  m*/

    if (req.getPathTranslated() != null && req.getPathTranslated().contains("dynamic-image")) {
        handleDynamicImage(req, resp);
    }

    final HttpSession session = req.getSession(true);
    System.out.println(" (possibly new) sessionid: " + session.getId() + ", requested sessionid: "
            + req.getRequestedSessionId() + ", from cookie: " + req.isRequestedSessionIdFromCookie()
            + ", valid: " + req.isRequestedSessionIdValid());

    /*
     * Result:
     * GET https://localhost:8443/http2-java8-example-1.0/return.gif?answer=42
     *  header: x-my-header=[bar]
     *  header: x-my-header-1=[foo]
     *  header: x-my-header-1=[zaphod]
     */
    // Tomcat impl: http://svn.apache.org/viewvc/tomcat/tc9.0.x/branches/gsoc-jaspic/java/org/apache/catalina/core/ApplicationPushBuilder.java?view=markup
    PushBuilder pb = req.getPushBuilder().path("return.gif") // path is the only required value

            // note: the browser does not show these headers - only the ones delivered in the pushed resource itself
            .setHeader("x-my-header", "overwritten by subsequent setHeader").setHeader("x-my-header", "bar")
            .addHeader("x-my-header-1", "foo").addHeader("x-my-header-1", "zaphod") // note: had expected this to be reported as x-my-header-1=[foo,zaphod] ?

            // GET is default
            // ?! "IllegalArgumentException - if the method set expects a request body (eg POST)"; does not happen; Tomcat does not enforce it!
            .method("POST")

            .queryString("answer=42")

            //.sessionId("some-session-id") // dropped?! "pushed request will include the session ID either as a Cookie or as a URI parameter"
            .sessionId(session.getId())

    ;
    final boolean pushResult;
    try {
        //pb.push(); // results in 'java.lang.NoSuchMethodError: javax.servlet.http.PushBuilder.push()V'
        // - Tomcat's Servlet 4.0 API version return type is boolean, not void!
        final Method push = pb.getClass().getMethod("push");
        pushResult = (boolean) push.invoke(pb);
    } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
        if (e.getCause() instanceof UnsupportedOperationException) {
            respondWith(resp,
                    "<p>The following image was NOT provided via a push request! "
                            + "Cannot push over plain HTTP/1.x.</p>" + "<img src=\"" + req.getContextPath()
                            + "/return.gif\"/>");
            return;
        }
        respondWith(resp, e.getClass().getName() + ": " + e.getMessage() + ", cause: " + e.getCause());
        return;
    }

    simplePush(req, "Chrome Pony.png");
    simplePush(req, "second.html");

    respondWith(resp,
            "<p>The following static image was provided via a push request with result " + pushResult + "</p>"
                    + "<img src=\"" + req.getContextPath() + "/return.gif\"/><br/>"
                    + "<p>Dynamic push request: </p><img src=\"push/dynamic-image\"/><br/>"
                    + "<p><a href=\"second.html\">Link naar gepushte pagina</a></p>");
}

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From source file:nl.ordina.jtech.http2.java8.server.tomcat.SimpleImagePush.java

private void simplePush(final HttpServletRequest req, final String path) {
    final PushBuilder pb = req.getPushBuilder().path(path);
    try {//from  w  ww. j av a 2  s .c o  m
        pb.getClass().getMethod("push").invoke(pb);
    } catch (final IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        // ignore
    }
}

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