Examples of java.net.URL

java.net.URL
ocs.uts.edu.au/MosaicDocs-old/url-primer.html"> http://www.socs.uts.edu.au/MosaicDocs-old/url-primer.html
In general, a URL can be broken into several parts. The previous example of a URL indicates that the protocol to use is http (HyperText Transfer Protocol) and that the information resides on a host machine named www.socs.uts.edu.au. The information on that host machine is named /MosaicDocs-old/url-primer.html. The exact meaning of this name on the host machine is both protocol dependent and host dependent. The information normally resides in a file, but it could be generated on the fly. This component of the URL is called the path component.
A URL can optionally specify a "port", which is the port number to which the TCP connection is made on the remote host machine. If the port is not specified, the default port for the protocol is used instead. For example, the default port for http is 80. An alternative port could be specified as:
```
 http://www.socs.uts.edu.au:80/MosaicDocs-old/url-primer.html 
```
The syntax of URL is defined by RFC 2396: Uniform Resource Identifiers (URI): Generic Syntax, amended by RFC 2732: Format for Literal IPv6 Addresses in URLs. The Literal IPv6 address format also supports scope_ids. The syntax and usage of scope_ids is described here.
A URL may have appended to it a "fragment", also known as a "ref" or a "reference". The fragment is indicated by the sharp sign character "#" followed by more characters. For example,
```
 http://java.sun.com/index.html#chapter1 
```
This fragment is not technically part of the URL. Rather, it indicates that after the specified resource is retrieved, the application is specifically interested in that part of the document that has the tag chapter1 attached to it. The meaning of a tag is resource specific.
An application can also specify a "relative URL", which contains only enough information to reach the resource relative to another URL. Relative URLs are frequently used within HTML pages. For example, if the contents of the URL:
```
 http://java.sun.com/index.html 
```
contained within it the relative URL:
```
 FAQ.html 
```
it would be a shorthand for:
```
 http://java.sun.com/FAQ.html 
```
The relative URL need not specify all the components of a URL. If the protocol, host name, or port number is missing, the value is inherited from the fully specified URL. The file component must be specified. The optional fragment is not inherited.
The URL class does not itself encode or decode any URL components according to the escaping mechanism defined in RFC2396. It is the responsibility of the caller to encode any fields, which need to be escaped prior to calling URL, and also to decode any escaped fields, that are returned from URL. Furthermore, because URL has no knowledge of URL escaping, it does not recognise equivalence between the encoded or decoded form of the same URL. For example, the two URLs:
```
    http://foo.com/hello world/ and http://foo.com/hello%20world
```
would be considered not equal to each other.
Note, the {@link java.net.URI} class does perform escaping of itscomponent fields in certain circumstances. The recommended way to manage the encoding and decoding of URLs is to use {@link java.net.URI}, and to convert between these two classes using {@link #toURI()} and{@link URI#toURL()}.
The {@link URLEncoder} and {@link URLDecoder} classes can also beused, but only for HTML form encoding, which is not the same as the encoding scheme defined in RFC2396. @author James Gosling @version 1.136, 04/30/09 @since JDK1.0

  private VDBRepository vdbRepository;
  


  public void start() {
    try {
      URL url = Thread.currentThread().getContextClassLoader().getResource(CoreConstants.SYSTEM_VDB);
      if (url == null) {
        throw new TeiidRuntimeException(RuntimeMetadataPlugin.Util.getString("system_vdb_not_found")); //$NON-NLS-1$
      }
      // uri conversion is only to remove the spaces in URL, note this only with above kind situation  
      URI uri = new URI(url.getProtocol(), url.getPath(), null);
      this.vdbRepository.setSystemStore(new IndexMetadataFactory(uri.toURL()).getMetadataStore(null));
    } catch (URISyntaxException e) {
      throw new TeiidRuntimeException(e, RuntimePlugin.Util.getString("system_vdb_load_error")); //$NON-NLS-1$
    } catch (IOException e) {
      throw new TeiidRuntimeException(e, RuntimePlugin.Util.getString("system_vdb_load_error")); //$NON-NLS-1$

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        InputStreamReader inSR  = null;
        BufferedReader buffReader = null;
        
        try {
            // create the URL object
            URL url = new URL(yahooUrl);
            
            // create the connection to the URL
            URLConnection conn = url.openConnection();


            // establish the connection to the URL                          
            conn.connect();
            
            // get the stream from the commection

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  private final URL url;
  private final HttpVerb verb;
  
  public HttpRequest(String url, HttpVerb verb) {
    try {
      this.url = new URL(url);
      this.verb = verb;
    } catch (MalformedURLException e) {
      logger.error("Malformed URL: {}", e.getMessage());
      throw new RuntimeException(e);
    }

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      Vector sections = Section.listAll();
      Mapping.rollback();
      for (int i = 0; i < sections.size(); i++) {
        Section section = (Section) sections.get(i);
        try {
          URL url =
            new URL(
              frontUrl+"/section/"
                + section.getId()
                + ".html?static=true&nocache=true");
          BufferedReader reader =
            new BufferedReader(
              new InputStreamReader(url.openStream()));
          String content = "<!-- �ON static export -->";
          String line = "";
          while (line != null) {
            line = reader.readLine();
            if (line != null) {
              content += line;
            }
          }


          ZipEntry ze =
            new ZipEntry("section/" + section.getId() + ".html");
          zip.putNextEntry(ze);
          zip.write(content.getBytes());
          zip.closeEntry();
        } catch (Exception e) {
          System.out.println(
            "Static export error, section " + section.getId());
        }
      }


      // add publications
      Mapping.begin();
      Vector publications = Publication.listAll();
      Mapping.rollback();
      for (int i = 0; i < publications.size(); i++) {
        Publication publication = (Publication) publications.get(i);
        try {
          URL url =
            new URL(
              frontUrl+"/publication/"
                + publication.getId()
                + ".html?static=true&nocache=true");
          BufferedReader reader =
            new BufferedReader(
              new InputStreamReader(url.openStream()));
          String content = "<!-- �ON static export -->";
          String line = "";
          while (line != null) {
            line = reader.readLine();
            if (line != null) {
              content += line;
            }
          }
          ZipEntry ze =
            new ZipEntry(
              "publication/" + publication.getId() + ".html");
          zip.putNextEntry(ze);
          zip.write(content.getBytes());
          zip.closeEntry();
        } catch (Exception e) {
          System.out.println(
            "Static export error, publication "
              + publication.getId());
        }
      }


      // add index
      URL url =
        new URL(
          frontUrl+"?static=true&nocache=true");
      BufferedReader reader =
        new BufferedReader(new InputStreamReader(url.openStream()));
      String content = "<!-- �ON static export -->";
      String line = "";
      while (line != null) {
        line = reader.readLine();
        if (line != null) {

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    throws Exception
  {
    System.out.println("URLs will be logged to urls.txt\n\n");


    WebRobot robby = new WebRobot();
    robby.setStartURL(new URL("http://www.matuschek.net"));
    robby.setMaxDepth(1);
    robby.setSleepTime(0);


    FileWriter logfile = new FileWriter("urls.txt");
    URLLogger log = new URLLogger(logfile);

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  public void run() throws Exception {
    WebRobot robby = new WebRobot();
    robby.setStartURL(new URL("http://www.matuschek.net"));
    robby.setMaxDepth(1);
    robby.setSleepTime(0);


    // download only the first 5 documents
    DownloadStopper stopit = new DownloadStopper(5,robby);

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  public ExtendedURL fillForm(URL baseURL, Element form) {
    ExtendedURL eurl = new ExtendedURL();
    String formURL = form.getAttribute("action");
    String type = form.getAttribute("method");
    FormHandler handler;
    URL absoluteFormURL = null;


    try {
      absoluteFormURL = new URL(baseURL, formURL);
    } catch( MalformedURLException e) {
      log.info("MalformedURLException in fillForm(): "+e.getMessage());
    }


    if (! form.getNodeName().equals("form")) {
      log.error("not a form !");
      return null;
    }


    handler = getFormHandler(absoluteFormURL.toString());
    if (handler == null) {
      log.debug("found no form handler for URL "+formURL);
      return null;
    }

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      // jdk1.1/docs/guide/misc/resources.html
      Utils utils = new Utils();
      Enumeration<URL> urls = utils.getClass().getClassLoader().getResources(resourceName);
      boolean first = true;
      while (urls.hasMoreElements()) {
  URL url = urls.nextElement();
  if (first) {
    defaultProps.load(url.openStream());
    first = false;
  }
  else {
    Properties props = new Properties(defaultProps);
    props.load(url.openStream());
    defaultProps = props;
  }
      }
    } catch (Exception ex) {
      System.err.println("Warning, unable to load properties file(s) from "

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   * configure URLCheck
   */
  private void addCookie() {
    String cookieStr = JOptionPane.showInputDialog(this, "Cookie string:");
    String domain = JOptionPane.showInputDialog(this, "Domain:");
    URL url;
  try {
    url = new URL("http://"+domain);
  } catch (MalformedURLException e1) {
    JOptionPane.showMessageDialog(this, "Domain invalid: "+e1.getMessage());
    return;
  }
  try {

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  private boolean updateRobotFromDialog() {


    // start URL
    String startUrl = urlField.getText();
    try {
      URL u = new URL(startUrl);
      jobobase.getRobot().setStartURL(u);
    } catch (MalformedURLException e) {
      JOptionPane.showMessageDialog(this,"URL "+startUrl+" is invalid");
      return false;
    }

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