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)


  sUsr = sUser;
  sPwd = sPassword;


  URL oUrl = new URL(sUrl);
    oCon = (HttpURLConnection) oUrl.openConnection();
    oCon.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
    oCon.setDoOutput(true);
    oCon.setDoInput (true);
    oCon.setUseCaches(false);
  oCon.setRequestMethod("POST");

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    if (DebugFile.trace) {
      DebugFile.writeln("new URL("+sUrl+"username="+sUsr+"&password=..."+sFrm+"&to="+sMsisdn+"&text=...)");
    }


    URL oUrl = new URL(sQry);
      HttpURLConnection oCon = (HttpURLConnection) oUrl.openConnection();
      int iStatusCode = oCon.getResponseCode();


    if (DebugFile.trace) {
      DebugFile.writeln("response code is "+String.valueOf(iStatusCode));
    }

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      } // next
    } // fi (aFiles)
  } else if (sSourceURI.startsWith("http://")) {
    try {
        URL oUrl = new URL(sSourceURI);
      HttpURLConnection oCon = (HttpURLConnection) oUrl.openConnection();
      int iResponseCode = oCon.getResponseCode();
      oCon.disconnect();
      bExists = (iResponseCode>=200 && iResponseCode<=299);
      } catch (MalformedURLException mue) {
        throw new IOException(mue.getMessage());

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        throw new IOException(mue.getMessage());
      }
  } else if (sSourceURI.startsWith("https://")) {
    try {
        URL oUrl = new URL(sSourceURI);
      HttpsURLConnection oCon = (HttpsURLConnection) oUrl.openConnection();
      int iResponseCode = oCon.getResponseCode();
      oCon.disconnect();
      bExists = (iResponseCode>=200 && iResponseCode<=299);
      } catch (MalformedURLException mue) {
        throw new IOException(mue.getMessage());

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        final VFSClassLoader loader = createClassLoader();


        final URL resource = loader.getResource("read-tests/file1.txt");


        assertNotNull(resource);
        final URLConnection urlCon = resource.openConnection();
        assertSameURLContent(FILE1_CONTENT, urlCon);
    }


    /**
     * Tests package sealing.

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    } catch (MalformedURLException e) {
      throw new IOException("** MalformedURLException on URL <" + urlString + ">\n" + e.getMessage() + "\n");
    }


    try {
      java.net.HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
        // check response code is good
        int responseCode = httpConnection.getResponseCode();
        System.out.println(" response code= "+responseCode);
        if (responseCode / 100 != 2)
          throw new IOException("** Cant open URL <" + urlString + ">\n Response code = " + responseCode

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    } catch (MalformedURLException e) {
      throw new IOException( "** MalformedURLException on URL <"+urlString+">\n"+e.getMessage()+"\n");
    }


    try {
      java.net.URLConnection connection = url.openConnection();


      if (connection instanceof HttpURLConnection) {
        java.net.HttpURLConnection httpConnection = (HttpURLConnection) connection;
        // check response code is good
        int responseCode = httpConnection.getResponseCode();

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                            out = new FileOutputStream(getPathWithoutEscapes(url.getFile()));
                        }
                        // Try to write to some other kind of URI. Some protocols
                        // won't support this, though HTTP should work.
                        else {
                            URLConnection urlCon = url.openConnection();
                            urlCon.setDoInput(false);
                            urlCon.setDoOutput(true);
                            urlCon.setUseCaches(false); // Enable tunneling.
                            if (urlCon instanceof HttpURLConnection) {
                                // The DOM L3 LS CR says if we are writing to an HTTP URI

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                out = new FileOutputStream(getPathWithoutEscapes(url.getFile()));            
            }
            // Try to write to some other kind of URI. Some protocols
            // won't support this, though HTTP should work.
            else {
                URLConnection urlCon = url.openConnection();
                urlCon.setDoInput(false);
                urlCon.setDoOutput(true);
                urlCon.setUseCaches(false); // Enable tunneling.
                if (urlCon instanceof HttpURLConnection) {
                    // The DOM L3 LS CR says if we are writing to an HTTP URI

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          public InputStream run() throws IOException {
        InputStream is = null;
        if (reloadFlag) {
            URL url = classLoader.getResource(resourceName);
            if (url != null) {
          URLConnection connection = url.openConnection();
          if (connection != null) {
              // Disable caches to get fresh data for
              // reloading.
              connection.setUseCaches(false);
              is = connection.getInputStream();

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