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)

        return url.openConnection();
    }


    public static URLConnection httpPost(WebServer webServer, String path, String body) throws IOException {
        URL url = new URL(webServer.getUri().toURL(), path);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("POST");
        urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        urlConnection.setDoOutput(true);
        urlConnection.getOutputStream().write(body.getBytes(Charset.forName("UTF8")));
        return urlConnection;

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  public boolean exists() {
  if (pathUrlConnection == null)
  try {
    URL u = new URL(path);
    pathUrlConnection = u.openConnection();
  } catch (MalformedURLException e) {
  } catch (IOException e) {
  }
  if ( pathUrlConnection != null )
  try {

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      return (0);
    if (pathUrlConnection == null)
    {
      try {
          URL u = new URL(path);
          pathUrlConnection = u.openConnection();
      } catch (MalformedURLException e) {
      } catch (IOException e) {
      }
    }
    if (pathUrlConnection != null)

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  public Date lastModified() {
    if (pathUrlConnection == null)
    {
      try {
        URL u = new URL(path);
        pathUrlConnection = u.openConnection();
      } catch (MalformedURLException e) {
      } catch (IOException e) {
      }
    }

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            }
            try
            {
                // - Get around the fact the URL won't be released until the JVM
                //   has been terminated, when using the 'jar' uri protocol.
                url.openConnection().setDefaultUseCaches(false);
            }
            catch (final IOException exception)
            {
                // - ignore the exception
            }

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                        }
                    }


                } else {


                    URLConnection uc = repositoryURL.openConnection();
                    if (uc instanceof JarURLConnection){
                        JarFile  jarFile = ((JarURLConnection)uc).getJarFile();


                        // get all jar entries that belongs to the help repository
                        Set jarEntries = getJarDirectoryEntries(jarFile, ((JarURLConnection) uc).getEntryName());

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        }
          
      }
      
      URL url = new URL(connect_address);
      HttpURLConnection httpConnection =(HttpURLConnection) url.openConnection();
      
      httpConnection.setRequestProperty("User-Agent",     JMUpdater.USER_AGENT);
      httpConnection.setRequestProperty("Accept-Charset", JMUpdater.ENCODING);
      
      httpConnection.setDoInput(true);

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   private HttpURLConnection conn;
   
   public UrlConnection(String urlString) throws Exception {
      URL url = new URL(urlString);
      this.conn = (HttpURLConnection)url.openConnection();
      this.conn.setDoOutput(true);
   }


   public InputStream getInputStream() throws IOException {
      return this.conn.getInputStream();

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   {
      StringBuffer ret = null;
      try {
         // connect to the server
         URL url = new URL(urlStr);
         HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();


         // send a POST
         urlConnection.setRequestMethod("POST");
         urlConnection.setDoOutput(true);
         OutputStream outStream = urlConnection.getOutputStream();

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


    URLConnection con =  url.openConnection();


      
      con.setRequestProperty("Proxy-Authorization", 
                         "Basic " + new String(Base64.encodeBase64(("test:test").getBytes())));

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