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PODisplaying Captcha in a Swing panel
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2012-01-18T15:11:04.423
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<p>I've been trying to display a captcha for user input in a swing panel and then post the captcha text alongside with another information in order to access some public information about a company (in Brazil). BTW, I don't want to make a robot and neither to break/crack the captcha, I just wan't to avoid browsing and then fetch and register some information from the internet on my db. </p> <p>So far I've managed to display the captcha, but I can't understand why I'm not succeeding when posting. </p> <p>here is the page's link: <a href="http://www.receita.fazenda.gov.br/pessoaJuridica/CNPJ/CNPJREVA/CNPJREVA_solicitacao2.asp" rel="nofollow">http://www.receita.fazenda.gov.br/pessoaJuridica/CNPJ/CNPJREVA/CNPJREVA_solicitacao2.asp</a></p> <p>The form is basically the following:</p> <pre><code><form id="theForm" action="" onSubmit="javascript:return Submeter();" method="post" name="frmConsulta"> <input type="hidden" name="origem" value="comprovante"> <input tabIndex="1" name="cnpj" maxlength="14" size="16" onKeyup="SaltaCampo(document.frmConsulta.cnpj, document.frmConsulta.chave, 14, event)"value=""> <input type="text" tabIndex="2" id="idLetra" name="idLetra" maxlength="4" size="6"> <input type="text" id="idSom" name="idSom" size="7" maxlength="6" tabindex="4"> <input type="submit" value="Consultar" id=submit1 name=submit1> <input type="hidden" name="search_type" value="cnpj"> <input type="reset" name="opcao" value="Limpar"> </form> </code></pre> <p>The onSubmit javascript function is:</p> <pre><code>function Submeter() { document.cookie = 'flag=1'; if (validaCaracteresCaptcha('theForm', 'idLetra', 'idSom', 'valida.asp') == false) { return false; } } </code></pre> <p>the validaCaracteresCaptcha function is:</p> <pre><code>function validaCaracteresCaptcha(nomeForm, idLetra, idSom, paginaDestino) { var form = document.getElementById(nomeForm); if (document.getElementById(idLetra).value == "" && document.getElementById(idSom).value == "") { AlertaCaptcha("Favor preencher algum dos campos de validação"); form.action= ""; return false; } if (document.getElementById(idLetra).value != "" && document.getElementById(idSom).value != "") { AlertaCaptcha("Favor preencher apenas um dos campos de validação"); form.action=""; return false; } form.action=paginaDestino; return true; } </code></pre> <p>and the two functions I'm using to get the captcha and then post the information (java):</p> <pre><code>protected void getCaptcha() { try { URL url = new URL ("http://www.receita.fazenda.gov.br/pessoaJuridica/CNPJ/CNPJREVA/valida.asp"); // URL connection channel. urlConn = (HttpURLConnection) url.openConnection(); URL cUrl = new URL("http://www.receita.fazenda.gov.br/scripts/srf/intercepta/captcha.aspx?opt=image"); lblCaptcha.setIcon(new ImageIcon(cUrl)); // Let the run-time system (RTS) know that we want input. urlConn.setDoInput (true); // Let the RTS know that we want to do output. urlConn.setDoOutput (true); // No caching, we want the real thing. urlConn.setUseCaches (false); // Specify the content type. urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); urlConn.setRequestMethod("POST"); urlConn.setConnectTimeout(0); urlConn.connect(); // } catch(Exception e) { e.printStackTrace(); } } private void postIt() { try { // Send POST output. DataOutputStream printout = new DataOutputStream (urlConn.getOutputStream ()); String content = "origem=comprovante&cnpj="+txtCnpj.getText()+"&idSom="+txtCaptcha.getText()+"&search_type=cnpj"; printout.writeBytes (content); printout.flush (); printout.close (); // Get response data. if(urlConn.getResponseCode()==HttpURLConnection.HTTP_OK) { BufferedReader reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); String str = ""; while((str = reader.readLine()) != null) { System.out.println(str); } reader.close (); } else System.out.println("Answer not received"); } catch(Exception e) { e.printStackTrace(); } } </code></pre> <p>and that's it. Thanks in advance!</p>
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<java><javascript><html><swing>
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Displaying Captcha in a Swing panel
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