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

            log.log(   LoggerChannel.LT_INFORMATION, "        " + msg + "Download from "+
                  sf_plugin_download);
            
            ResourceDownloaderFactory rdf =  plugin_interface.getUtilities().getResourceDownloaderFactory();
            
            ResourceDownloader direct_rdl = rdf.create( new URL( sf_plugin_download ));


              // work out what the torrent download will be, if it exists 
              // sf_plugin_download will be something like ../plugins/safepeer_2.4.zip
              //     torrent is safepeer_2.4.zip.torrent
            
            String  torrent_download = Constants.AELITIS_TORRENTS;
            
            int  slash_pos = sf_plugin_download.lastIndexOf("/");
            
            if ( slash_pos == -1 ){
              
              torrent_download += sf_plugin_download;
              
            }else{
              
              torrent_download += sf_plugin_download.substring( slash_pos + 1 );
            }
            
            torrent_download  += ".torrent";
            
            ResourceDownloader torrent_rdl = rdf.create( new URL( torrent_download ));


            torrent_rdl  = rdf.getSuffixBasedDownloader( torrent_rdl );
            
              // create an alternate downloader with torrent attempt first

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     * @throws RuntimeException ...
     */
    public INode convert(String desc, INode helmaNode)
                  throws RuntimeException {
        try {
            return convert(new URL(desc), helmaNode);
        } catch (MalformedURLException notanurl) {
            try {
                return convert(new File(desc), helmaNode);
            } catch (FileNotFoundException notfound) {
                throw new RuntimeException("couldn't read xml: " + desc);

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   */
  public static File findFileOnClasspath( String filename ) 
  {
    ClassLoader cl               = null ;
    File file                    = null ;
    URL url                      = null ;


    try
    {
      cl = FileFinder.class.getClassLoader() ;
      if ( cl == null )
      {
        // System.out.println( "No classloader found !\n<P>" ) ;
        return null ;
      }
      url = cl.getResource( filename ) ;
      if ( url == null )
      {
        // System.out.println( "Settings file '" + filename + "' not found in CLASSPATH !!!" ) ;
      }
      else
      {
        file = new File( url.getFile() ) ;
        // System.out.println( "Settings file '" + file.getAbsolutePath() + "' exists: " + file.exists() ) ;
        if ( ! fileExists( file ) )
          file = null ;
      }
    }

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          if ( plugin_class_loader instanceof URLClassLoader ){


            URLClassLoader  current = (URLClassLoader)plugin_class_loader;


            URL url = current.findResource("plugin.properties");


            if ( url != null ){
              URLConnection connection = url.openConnection();


              InputStream is = connection.getInputStream();


              props.load(is);


            }else{


              throw( new Exception( "failed to load plugin.properties from jars"));
            }
          }else{


            throw( new Exception( "failed to load plugin.properties from dir or jars"));


          }
        }
      }catch( Throwable e ){


        Debug.printStackTrace( e );


        String  msg =  "Can't read 'plugin.properties' for plugin '" + pluginName + "': file may be missing";


        Logger.log(new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_ERROR, msg));


        System.out.println( msg );


        throw( new PluginException( msg, e ));
      }


      checkJDKVersion( pluginName, props, true );
      checkAzureusVersion(pluginName, props, true);


      plugin_class_string = (String)props.get( "plugin.class");


      if ( plugin_class_string == null ){


        plugin_class_string = (String)props.get( "plugin.classes");


        if ( plugin_class_string == null ){


          // set so we don't bork later will npe


          plugin_class_string = "";
        }
      }


      String  plugin_name_string = (String)props.get( "plugin.name");


      if ( plugin_name_string == null ){


        plugin_name_string = (String)props.get( "plugin.names");
      }


      int  pos1 = 0;
      int  pos2 = 0;


      while(true){
        int  p1 = plugin_class_string.indexOf( ";", pos1 );


        String  plugin_class;


        if ( p1 == -1 ){
          plugin_class = plugin_class_string.substring(pos1).trim();
        }else{
          plugin_class  = plugin_class_string.substring(pos1,p1).trim();
          pos1 = p1+1;
        }


        PluginInterfaceImpl existing_pi = getPluginFromClass( plugin_class );


        if ( existing_pi != null ){


          if (bSkipAlreadyLoaded) {
            break;
          }


          // allow user dir entries to override app dir entries without warning


          File  this_parent   = directory.getParentFile();
          File  existing_parent = null;


          if ( existing_pi.getInitializerKey() instanceof File ){


            existing_parent  = ((File)existing_pi.getInitializerKey()).getParentFile();
          }


          if (   this_parent.equals( FileUtil.getApplicationFile("plugins")) &&
              existing_parent  != null &&
              existing_parent.equals( FileUtil.getUserFile( "plugins" ))){


            // skip this overridden plugin


            if (Logger.isEnabled())
              Logger.log(new LogEvent(LOGID, "Plugin '" + plugin_name_string
                  + "/" + plugin_class
                  + ": shared version overridden by user-specific one"));


            return( new ArrayList());


          }else{
            Logger.log(new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_WARNING,
                "Error loading '" + plugin_name_string + "', plugin class '"
                + plugin_class + "' is already loaded"));
          }


        }else{


          String  plugin_name = null;


          if ( plugin_name_string != null ){


            int  p2 = plugin_name_string.indexOf( ";", pos2 );




            if ( p2 == -1 ){
              plugin_name = plugin_name_string.substring(pos2).trim();
            }else{
              plugin_name  = plugin_name_string.substring(pos2,p2).trim();
              pos2 = p2+1;
            }    
          }


          Properties new_props = (Properties)props.clone();


          for (int j=0;j<default_version_details.length;j++){


            if ( plugin_class.equals( default_version_details[j][0] )){


              if ( new_props.get( "plugin.id") == null ){


                new_props.put( "plugin.id", default_version_details[j][1]);  
              }


              if ( plugin_name == null ){


                plugin_name  = default_version_details[j][2];
              }


              if ( new_props.get( "plugin.version") == null ){


                // no explicit version. If we've derived one then use that, otherwise defaults


                if ( plugin_version[0] != null ){


                  new_props.put( "plugin.version", plugin_version[0]);


                }else{


                  new_props.put( "plugin.version", default_version_details[j][3]);
                }
              }
            }
          }


          new_props.put( "plugin.class", plugin_class );


          if ( plugin_name != null ){


            new_props.put( "plugin.name", plugin_name );
          }


          // System.out.println( "loading plugin '" + plugin_class + "' using cl " + classLoader);


          // if the plugin load fails we still need to generate a plugin entry
          // as this drives the upgrade process




          Throwable  load_failure  = null;


          String pid = plugin_id[0]==null?directory.getName():plugin_id[0];


          List<File>  verified_files = null;


          Plugin plugin = null;


          if ( vc_disabled_plugins.contains ( pid )){


            log( "Plugin '" + pid + "' has been administratively disabled" );


          }else{
            try{
              String cl_key = "plugin.cl.ext." + pid;
              
              String str = COConfigurationManager.getStringParameter( cl_key, null );


              if ( str != null && str.length() > 0 ){


                COConfigurationManager.removeParameter( cl_key );
                
                plugin_class_loader = PluginLauncherImpl.extendClassLoader( root_class_loader, plugin_class_loader, new URL( str ));
              }
            }catch( Throwable e ){  
            }


            if ( pid.endsWith( "_v" )){

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        InputStream in = null;
        try {
          String name = args[index++];
          System.out.print(name + ";");
          if (name.startsWith("http://")) {
            in = new URL(name).openConnection().getInputStream();
          } else {
            in = new FileInputStream(name);
          }
          run(name, in, imageInfo, verbose);
          in.close();

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        Document doc;


        if (obj instanceof String) {
            try {
                // first try to interpret string as URL
                new URL(obj.toString());


                doc = parser.parse(obj.toString());
            } catch (MalformedURLException nourl) {
                // if not a URL, maybe it is the XML itself
                doc = parser.parse(new InputSource(new StringReader(obj.toString())));

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        }


        if (obj instanceof String) {
            try {
                // first try to interpret string as URL
                URL url = new URL(obj.toString());
                return getHtmlDocument(new InputStreamReader(url.openStream()));
            } catch (MalformedURLException nourl) {
                // if not a URL, maybe it is the XML itself
                return getHtmlDocument(new StringReader(obj.toString()));
            }
        } else if (obj instanceof InputStream) {

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   * @param url the url to load from
   * @throws IOException if the url can't be set.
   */
  public void setURL(String url) throws IOException {
    m_URL = url;
    setSource(new URL(url));
  }

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   * @deprecated
   */
  public void openTorrentURL(String url) {
    PluginDeprecation.call("openTorrentURL", this.getPluginID());
    try{
      getDownloadManager().addDownload( new URL( url ));
    }catch( Throwable e ){
      throw( new RuntimeException(e));
    } 
  }

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  public URL[]
  getURLs()
  {
    try{
      URL  url = new URL((server.isSSL()?"https":"http") + "://" +  server.getHost() + ":" + server.getPort() + "/" );
        
        // quick fix for badly specified host whereby a valid URL is constructed but the port lost. For example, if#
        // someone has entered http://1.2.3.4 as the host
      
      if ( url.getPort() != server.getPort()){
        
        Debug.out( "Invalid URL '" + url + "' - check tracker configuration" );
        
        url = new URL( "http://i.am.invalid:" + server.getPort() + "/" );
      }
      
      return(  new URL[]{ url });
      
    }catch( MalformedURLException e ){

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