Examples of java.net.HttpURLConnection

java.net.HttpURLConnection
3.org/pub/WWW/Protocols/"> the spec for details.
Each HttpURLConnection instance is used to make a single request but the underlying network connection to the HTTP server may be transparently shared by other instances. Calling the close() methods on the InputStream or OutputStream of an HttpURLConnection after a request may free network resources associated with this instance but has no effect on any shared persistent connection. Calling the disconnect() method may close the underlying socket if a persistent connection is otherwise idle at that time. @see java.net.HttpURLConnection#disconnect() @since JDK1.1

            URL url = new URL(to.getAddress().getValue());
            connection = getConnection(url);
            connection.setDoOutput(true);
    
            if (connection instanceof HttpURLConnection) {
                HttpURLConnection hc = (HttpURLConnection)connection;
                hc.setRequestMethod("POST");
            }
        }
        origOut = new WrappedOutputStream();
        out = origOut;
    }

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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);
      httpConnection.setDoOutput(true);
      if (post_data.length()!=0)
        httpConnection.getOutputStream().write(post_data.getBytes());
      
      httpConnection.connect();
      http_response_code = httpConnection.getResponseCode();
      String result = "";
      InputStreamReader bufIn = new InputStreamReader(httpConnection.getInputStream(),JMUpdater.ENCODING);
            int c;
            while(true) {
              c= bufIn.read();
              if (c==-1) break;
              result+=((char)c);
            }
            httpConnection.disconnect();
      return result;
    }catch(Throwable t) {
      throw new JMHTTPConnectionException(t);
    }

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    protected URLConnection getConnection(URL url) throws IOException {
        URLConnection connection = url.openConnection();
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        if (connection instanceof HttpURLConnection) {
            HttpURLConnection hc = (HttpURLConnection)connection;
            hc.setRequestMethod("POST");
        }
        connection.setRequestProperty("Content-Type", "text/xml");
        return connection;
    }

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    }


    protected static int getResponseCode(URLConnection connection) throws IOException {
        int responseCode = HttpURLConnection.HTTP_OK;
        if (connection instanceof HttpURLConnection) {
            HttpURLConnection hc = (HttpURLConnection)connection;
            responseCode = hc.getResponseCode();
        } else {
            if (connection.getHeaderField(HTTP_RESPONSE_CODE) != null) {
                responseCode =
                    Integer.parseInt(connection.getHeaderField(HTTP_RESPONSE_CODE));
            }

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      } catch (IOException e) {
         // since the error content (normally the html code) is not propagated
         // we need to doit by our self.
         if (getURLConnection() instanceof HttpURLConnection) {
            try {
               HttpURLConnection errUrl = (HttpURLConnection)getURLConnection();
               if (errUrl != null) {
                  InputStream errStr = errUrl.getErrorStream();
                  BufferedReader br = new BufferedReader(new InputStreamReader(errStr));
                  StringBuffer buf = new StringBuffer();
                  String line = "";
                  while (line != null) {
                     line = br.readLine();
                     if (line == null)
                        break;
                     buf.append(line).append("\n");
                  }
                  errStr.close();
                  if (buf.length() > 0) {
                     throw new XmlRpcException(errUrl.getResponseCode(), buf.toString(), e);
                  }
               }
            }
            catch (IOException ex) {
               ex.printStackTrace();

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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();
         byte[] conversionHelper = inputString.getBytes();
         outStream.write(conversionHelper);
         outStream.flush();


         // read the answer of the server and store it in a string
         ret = new StringBuffer();
         InputStream inStream = urlConnection.getInputStream();
         int bytes = 0, deltaBytes = 0;
         int maxBytes = urlConnection.getContentLength();


         //         while ( (bytes = inStream.available()) > 0) {
         while (bytes < maxBytes) {
            deltaBytes = inStream.available();
            byte buffer[] = new byte[deltaBytes];

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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());


    InputStream dataStream = ProtocolTest.class.getResourceAsStream(file);
    try {
      OutputStream connOut = conn.getOutputStream();


      try {
        IOUtil.transfer(dataStream, connOut);
      }
      finally {
        connOut.close();
      }
    }
    finally {
      dataStream.close();
    }


    conn.connect();


    int responseCode = conn.getResponseCode();


    if (responseCode != HttpURLConnection.HTTP_OK && // 200 OK
        responseCode != HttpURLConnection.HTTP_NO_CONTENT) // 204 NO CONTENT
    {
      String response = "location " + location + " responded: " + conn.getResponseMessage() + " ("
          + responseCode + ")";
      fail(response);
    }
  }

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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();


    if (responseCode != HttpURLConnection.HTTP_OK && // 200 OK
        responseCode != HttpURLConnection.HTTP_NO_CONTENT) // 204 NO CONTENT
    {
      String response = "location " + location + " responded: " + conn.getResponseMessage() + " ("
          + responseCode + ")";
      fail(response);
    }
  }

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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();


    try {
      int responseCode = conn.getResponseCode();
      if (responseCode == HttpURLConnection.HTTP_OK) {
        // Process query results
        return QueryResultIO.parse(conn.getInputStream(), TupleQueryResultFormat.SPARQL);
      }
      else {
        String response = "location " + location + " responded: " + conn.getResponseMessage() + " ("
            + responseCode + ")";
        fail(response);
        throw new RuntimeException(response);
      }
    }
    finally {
      conn.disconnect();
    }
  }

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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);
          OutputStream out = con.getOutputStream();
          out.write(form.getBytes("ISO-8859-1"));
        }


        if (HttpClientUtil.is2xx(con.getResponseCode())) {
          System.out.println("shutdown command sent successfully");
        }
        else {
          System.out.println("Shutdown request failed: " + con.getResponseMessage());
          System.exit(3);
        }
      }
      catch (MalformedURLException e) {
        System.err.println("Malformed URL: " + serverURL);

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