Examples of java.net.URL.openConnection()

java.net.URL.openConnection()
Returns a URLConnection object that represents a connection to the remote object referred to by the URL.
A new connection is opened every time by calling the openConnection method of the protocol handler for this URL.
If for the URL's protocol (such as HTTP or JAR), there exists a public, specialized URLConnection subclass belonging to one of the following packages or one of their subpackages: java.lang, java.io, java.util, java.net, the connection returned will be of that subclass. For example, for HTTP an HttpURLConnection will be returned, and for JAR a JarURLConnection will be returned. @return a URLConnection to the URL. @exception IOException if an I/O exception occurs. @see java.net.URL#URL(java.lang.String,java.lang.String,int,java.lang.String) @see java.net.URLConnection @see java.net.URLStreamHandler#openConnection(java.net.URL)

    
    URL url = new URL("https://www.amazon.de/");
    System.setProperty("https.proxyHost", "localhost");
    System.setProperty("https.proxyPort", Integer.toString(proxy.getLocalPort()));


    URLConnection con =  url.openConnection();


    
    StringBuilder sb = new StringBuilder();
    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
    String inputLine;

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      if (path == null || closed && !path.equals(graphs.get(context))) {
        return;
      }
      URL url = findURL(path);
      Long since = lastModified.get(url);
      URLConnection urlCon = url.openConnection();
      if (since != null) {
        urlCon.setIfModifiedSince(since);
      }
      if (accept != null) {
        urlCon.setRequestProperty("Accept", accept);

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        //Try it as a url
        try {
            Matcher       m = Pattern.compile(" ").matcher(resourceName);
            String        encodedUrl = m.replaceAll("%20");
            URL           dataUrl    = new URL(encodedUrl);
            URLConnection connection = dataUrl.openConnection();
            s = connection.getInputStream();
        } catch (Exception exc) {}


        return s;
    }

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        //Try it as a url
        try {
            Matcher       m = Pattern.compile(" ").matcher(resourceName);
            String        encodedUrl = m.replaceAll("%20");
            URL           dataUrl    = new URL(encodedUrl);
            URLConnection connection = dataUrl.openConnection();
            s = connection.getInputStream();
        } catch (Exception exc) {}


        return s;
    }

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      sParams += aParams[p].getName()+"="+URLEncoder.encode(aParams[p].getValue(), "UTF-8");
      if (p<aParams.length-1) sParams += "&";
    } // next
  } // fi


    HttpURLConnection oCon = (HttpURLConnection) oUrl.openConnection();
    
    oCon.setUseCaches(false);
    oCon.setFollowRedirects(false);
    oCon.setInstanceFollowRedirects(false);
    oCon.setDoInput (true);

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    throws Exception
  {
    System.out.println("Put file to " + location);


    URL url = new URL(location);
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
    conn.setRequestMethod("PUT");
    conn.setDoOutput(true);


    RDFFormat dataFormat = RDFFormat.forFileName(file, RDFFormat.RDFXML);
    conn.setRequestProperty("Content-Type", dataFormat.getDefaultMIMEType());

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  private void delete(String location)
    throws Exception
  {
    URL url = new URL(location);
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
    conn.setRequestMethod("DELETE");


    conn.connect();


    int responseCode = conn.getResponseCode();

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  {
    location += "?query=" + URLEncoder.encode(query, "UTF-8") + "&queryLn=" + queryLn.getName();


    URL url = new URL(location);


    HttpURLConnection conn = (HttpURLConnection)url.openConnection();


    // Request SPARQL-XML formatted results:
    conn.setRequestProperty("Accept", TupleQueryResultFormat.SPARQL.getDefaultMIMEType());


    conn.connect();

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      try {
        URL url = new URL(serverURL);


        System.out.println("connecting to the server...");
        HttpURLConnection con = (HttpURLConnection)url.openConnection();
        con.setDoOutput(true);
        con.setRequestMethod("POST");


        if (keyString != null) {
          String form = HttpClientUtil.encodeParameter(SesameServer.SHUTDOWN_KEY_PARAM, keyString);

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  if (null==oReferUrl)
    oUrl = new URL(sUrl);
  else
    oUrl = new URL(oReferUrl, sUrl);


    HttpURLConnection oCon = (HttpURLConnection) oUrl.openConnection();
    
    oCon.setUseCaches(false);
    oCon.setFollowRedirects(false);
    oCon.setInstanceFollowRedirects(false);
    oCon.setDoInput (true);

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