Errore di HtmlUnit & GWT

https://stackoverflow.com/questions/4512249

12-10-2019
|

Domanda

Ho un'applicazione GWT che cerco di indice.

Sto usando HtmlUnit per ottenere il contenuto del HTML generato:

WebClient webClient = new WebClient(BrowserVersion.FIREFOX_3_6);
HtmlPage refDesing = webClient.getPage("http://localhost:8080/MyGWTApp/#page2");
FileOutputStream fos1 = new FileOutputStream("D:\\work\\out\\page2.html");
fos1.write(refDesing.asXml().getBytes());
fos1.close();

Ma ottengo il seguente errore e la pagina restituita circa vuoto!

Dec 22, 2010 6:16:25 PM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'http://xxxxxxxxxxxx/xxxxxxxx/xxxxxxxx/xxxxxxxxxx.nocache.js', but got 'application/x-javascript'.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [485:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [485:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [485:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [518:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [518:29] Error in style rule. Invalid token "\n  ". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [518:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [541:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [541:29] Error in style rule. Invalid token "\n  ". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [541:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [951:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [951:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [951:29] Ignoring the following declarations in this rule.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [977:24] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>.
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error
WARNING: CSS error: null [977:29] Error in style rule. Invalid token "\n". Was expecting one of: "}", ";".
Dec 22, 2010 6:16:27 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning
WARNING: CSS warning: null [977:29] Ignoring the following declarations in this rule.

Modifica

Quello che voglio dire è di circa da vuoti, di qui un'istantanea del HTML restituita:

Si noti che, non tutti i dati che vengono visualizzati nella pagina originale (che ha ottenuto originale da DB) restituito da HtmlUnit. Anche ciò che "?" si intende? Non credo che qualsiasi errore di codifica causa tutte le parole sono i caratteri ASCII chiare.

<td align="center" style="vertical-align: top;">
    <table class="refDesignGrid" cellspacing="5">
      <colgroup>
        <col/>
      </colgroup>
      <tbody align="left">
        <tr>
          <td align="left" style="vertical-align: top;">
            <table cellpadding="0" class="categoryItem" cellspacing="0">
              <tbody align="left">
                <tr>
                  <td align="left" style="vertical-align: top;">
                    <div class="header4">
                      C++
                    </div>
                  </td>
                </tr>
              </tbody>
            </table>
          </td>
          <td align="left" style="vertical-align: top;">
            <table cellpadding="0" class="categoryItem" cellspacing="0">
              <tbody align="left">
                <tr>
                  <td align="left" style="vertical-align: top;">
                    <div class="header4">
                      Java
                    </div>
                  </td>
                </tr>
              </tbody>
            </table>
          </td>
          <td align="left">
            <table cellpadding="0" class="categoryItem" cellspacing="0">
              <tbody align="left">
                <tr>
                  <td align="left" style="vertical-align: top;">
                    <div class="header4">
                      C#
                    </div>
                  </td>
                </tr>
              </tbody>
            </table>
          </td>
          <td>
            ?
          </td>
        </tr>
        <tr>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
        </tr>
        <tr>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
        </tr>
        <tr>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
        </tr>
        <tr>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
          <td>
            ?
          </td>
        </tr>
      </tbody>
    </table>
  </td>
</tr>
</tbody>
</table>
</div>

Soluzione 2

La risposta è qui: http://htmlunit.sourceforge.net/faq.html#AJAXDoesNotWork

Il filo principale utilizzando HtmlUnit può essere terminando l'esecuzione prima permettendo thread in background per l'esecuzione. Hai un paio di opzioni:

webClient.setAjaxController (nuova NicelyResynchronizingAjaxController ()); dirà il vostro WebClient esempio risincronizzare XHR asincrono. webClient.waitForBackgroundJavaScript (10000); o webClient.waitForBackgroundJavaScriptStartingBefore (10000); subito dopo ottenendo la pagina e prima di manipolarlo. Esplicitamente attendere un condizione che ci si aspetta essere soddisfatta quando viene eseguito il tuo JavaScript, per es.
//try 20 times to wait .5 second each for filling the page.
for (int i = 0; i < 20; i++) {
    if (condition_to_happen_after_js_execution) {
         break;
     }
     synchronized (page) {
         page.wait(500);
     }
}

Altri suggerimenti

HtmlUnit può essere un po loquace, e in particolare può rendere le cose sembrano peggiori di quello che sono.

Crea queste due classi:

import org.w3c.css.sac.CSSException;
import org.w3c.css.sac.CSSParseException;
import com.gargoylesoftware.htmlunit.DefaultCssErrorHandler;

/*
 * get rid of warnings... and provide a place to hang a break point
 */
public class QuietCssErrorHandler
    extends DefaultCssErrorHandler
{

    @Override public void error( CSSParseException e ) throws CSSException 
    {
        super.error( e ) ;
    }

    @Override public void fatalError( CSSParseException e ) throws CSSException 
    { 
        super.fatalError( e ) ; 
    }

    @Override public void warning( CSSParseException e ) throws CSSException 
    {
    }
}

import com.gargoylesoftware.htmlunit.IncorrectnessListener;

public class SilentIncorrectnessListener
    implements IncorrectnessListener
{
    @Override public void notify( String message, Object origin ) 
    {
        // do nuttin' honey!
    }
}

poi, quando si crea il WebClient ...

wc.setIncorrectnessListener( new SilentIncorrectnessListener() ) ;
wc.setCssErrorHandler( new QuietCssErrorHandler() ) ;

E si dovrebbe quindi ottenere un minor numero di avvisi.

Per quanto riguarda "circa svuotare" ... cosa vuol dire?

Autorizzato sotto: CC-BY-SA insieme a attribuzione

Non affiliato a StackOverflow