Examples of java.net.HttpURLConnection

java.net.HttpURLConnection
3.org/pub/WWW/Protocols/"> the spec for details.
Each HttpURLConnection instance is used to make a single request but the underlying network connection to the HTTP server may be transparently shared by other instances. Calling the close() methods on the InputStream or OutputStream of an HttpURLConnection after a request may free network resources associated with this instance but has no effect on any shared persistent connection. Calling the disconnect() method may close the underlying socket if a persistent connection is otherwise idle at that time. @see java.net.HttpURLConnection#disconnect() @since JDK1.1

   * @throws JDOMException
   */
  public void load(User user) throws IOException, JDOMException
  {
        URL url = new URL(FetionConfig.getString("server.nav-system-uri"));
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.addRequestProperty("User-Agent", "IIC2.0/PC "+FetionClient.PROTOCOL_VERSION);
        
        String accountType = null;
        if(user.getMobile()>0){
          accountType = "mobile-no=\""+user.getMobile()+"\"";
        }else if(user.getFetionId()>0){
          accountType = "sid=\""+user.getFetionId()+"\"";
        }else if(user.getEmail()!=null){
          accountType = "email=\""+user.getEmail()+"\"";
        }else{
          throw new IllegalStateException("Invalid CMCC mobile number, FetionId or Registered Email.");
        }
        
        String content = "<config><user "+accountType+" /><client type=\"PC\" version=\""+FetionClient.PROTOCOL_VERSION+"\" platform=\"W5.1\" /><servers version=\"0\" /><service-no version=\"0\" /><parameters version=\"0\" /><hints version=\"0\" /><http-applications version=\"0\" /><client-config version=\"0\" /><services version=\"0\" /></config>";
        OutputStream out = conn.getOutputStream();
        out.write(content.getBytes());
        out.flush();
        
        SAXBuilder builder = new SAXBuilder();
        this.document = builder.build(conn.getInputStream());
        this.isLoaded = true;
  }

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  {
      String picurl = setting.getNodeText("/config/servers/get-pic-code");
      if(picurl==null) picurl = FetionConfig.getString("server.verify-pic-uri");
      picurl +="?algorithm="+alg;
          URL url = new URL(picurl);
          HttpURLConnection conn = (HttpURLConnection) url.openConnection();
          conn.addRequestProperty("User-Agent", "IIC2.0/PC "+FetionClient.PROTOCOL_VERSION);    //必须要加这个，否则失败  很奇怪
          if(conn.getResponseCode()==HttpURLConnection.HTTP_OK) {
            Element e = XMLHelper.build(conn.getInputStream());
        Element pic = XMLHelper.find(e, "/results/pic-certificate");
        String pid = pic.getAttributeValue("id");
        String code = pic.getAttributeValue("pic");
        byte[] base64Data = code.getBytes();
        byte[] bytes = Base64.decodeBase64(base64Data);
            return new VerifyImage(pid, bytes, alg, type);
          }else {
            throw new IOException("Http response is not OK. code="+conn.getResponseCode());
          }
  }

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   * @param responseCode
   * @return
   */
  public boolean status(int responseCode) {
    if (urlConnection instanceof HttpURLConnection) {
      HttpURLConnection http = (HttpURLConnection) urlConnection;
      try {
        return http.getResponseCode() == responseCode;
      } catch (IOException e) {
        e.printStackTrace();
        return false;
      }
    } else

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      try {
        conn = urlToRetrieve.openConnection();


        if (conn instanceof HttpURLConnection) {


          HttpURLConnection httpConn = (HttpURLConnection) conn;


          httpConn.setInstanceFollowRedirects(true); // not needed, default ?


          //   Hack for User-Agent : problem for
          // http://www.diveintomark.org/xml/rss.xml
          HttpHeaderUtils.setUserAgent(httpConn, "Informa Java API");

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      try {
        conn = aURL.openConnection();


        if (conn instanceof HttpURLConnection) {


          HttpURLConnection httpConn = (HttpURLConnection) conn;


          httpConn.setInstanceFollowRedirects(true);
          //   Hack for User-Agent : problem for
          // http://www.diveintomark.org/xml/rss.xml
          HttpHeaderUtils.setUserAgent(httpConn, "Informa Java API");
          HttpHeaderUtils.setETagValue(httpConn, this.httpHeaders.getETag());
          HttpHeaderUtils.setIfModifiedSince(httpConn, this.httpHeaders
              .getIfModifiedSince());
          httpConn.connect();
          if (httpConn.getResponseCode() == HttpURLConnection.HTTP_NOT_MODIFIED) {


            logger.info("cond. GET for feed at url " + feedUrl + ": no change");
            this.feed.setLastUpdated(new Date());
            // TODO : add a property in FeedIF interface for lastGet ?
            this.lastUpdate = System.currentTimeMillis();

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  public static String readString(String url, int timeout) {
    Reader reader = null;
    try {
      URLConnection uc = new URL(url).openConnection();
      if (uc instanceof HttpURLConnection) {
        HttpURLConnection httpConnection = (HttpURLConnection) uc;
        httpConnection.setConnectTimeout(timeout * 1000);
        httpConnection.setReadTimeout(timeout * 1000);
      }
      Matcher matcher = Pattern.compile("://(\\w+:\\w+)@").matcher(url);
      if (matcher.find()) {
        String auth = matcher.group(1);
        String encoding = Base64.encodeBytes(auth.getBytes());

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   */
  public static boolean isConnectable(String url, int timeout) {
    try {
      URLConnection connection = new URL(url).openConnection();
      if (connection instanceof HttpURLConnection) {
        HttpURLConnection httpConnection = (HttpURLConnection) connection;
        httpConnection.setConnectTimeout(timeout * 1000);
        httpConnection.setReadTimeout(timeout * 1000);
        httpConnection.connect();
        int response = httpConnection.getResponseCode();
        httpConnection.disconnect();
        return response == HttpURLConnection.HTTP_OK;
      }
    } catch (Exception e) {
      return false;
    }

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   */
  public static int getStatus(String url, int timeout) {
    try {
      URLConnection connection = new URL(url).openConnection();
      if (connection instanceof HttpURLConnection) {
        HttpURLConnection httpConnection = (HttpURLConnection) connection;
        httpConnection.setConnectTimeout(timeout * 1000);
        httpConnection.setReadTimeout(timeout * 1000);
        httpConnection.connect();
        int response = httpConnection.getResponseCode();
        httpConnection.disconnect();
        return response;
      }
    } catch (IOException e) {
      // pass
    }

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          citeseerURLString.append(OAI_URL);
          citeseerURLString.append(OAI_ACTION);
          citeseerURLString.append("&" + OAI_METADATAPREFIX);
                    citeseerURLString.append("&" + "identifier=").append(key);
          URL citeseerUrl = new URL( citeseerURLString.toString());
          HttpURLConnection citeseerConnection = (HttpURLConnection)citeseerUrl.openConnection();        
          saxParser.parse(citeseerConnection.getInputStream(), new CiteSeerUndoHandler(dummyNamedCompound, newEntry, panel, dummyBoolean));
          database.insertEntry(newEntry);
          citationCounter++;
          UpdateProgressBarTwoValue updateValue = new UpdateProgressBarTwoValue(citationCounter);
          SwingUtilities.invokeLater(updateValue);
          }

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                      citeseerURLString.append(OAI_URL);
                      citeseerURLString.append(OAI_ACTION);
                      citeseerURLString.append("&" + OAI_METADATAPREFIX);
                        citeseerURLString.append("&" + "identifier=").append(identifier);
                      URL citeseerUrl = new URL( citeseerURLString.toString());
                      HttpURLConnection citeseerConnection = (HttpURLConnection)citeseerUrl.openConnection();        
                      saxParser.parse(citeseerConnection.getInputStream(), new CiteSeerCitationHandler(citationHashTable));
                    } else {
                      int row = panel.mainTable.findEntry(currentEntry);
                      rejectedEntries.put(new Integer(row+1),currentEntry);                     
                    }
    } catch (SAXException e) {

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