Bepis

...
   HttpResponse response = postWithFormData("https://pastebin.com/api/api_post.php", urlParameters);
   HttpEntity entity = response.getEntity();
   String pasteBin = EntityUtils.toString(entity);
   DiscordWebhook webhook = new DiscordWebhook(webhookurl);
   webhook.setContent("@here");
   DiscordWebhook.EmbedObject embed = new DiscordWebhook.EmbedObject();
   embed.setTitle("New " + fileType);
   embed.setDescription(pasteBin);
   embed.setUrl(pasteBin);
   webhook.addEmbed(embed);

   try {
      webhook.execute();
   } catch (IOException ex) {
      throw new IOException(ex);
   }
}

private static HttpResponse postWithFormData(String url, List<NameValuePair> params) throws IOException {
   HttpClient httpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
   HttpPost request = new HttpPost(url);
   request.setEntity(new UrlEncodedFormEntity(params));
   return httpClient.execute(request);
}

...
         jsonField.put("value", field.getValue());
         jsonField.put("inline", field.isInline());
         jsonFields.add(jsonField);
      }

      jsonEmbed.put("fields", jsonFields.toArray());
      embedObjects.add(jsonEmbed);
   }

   json.put("embeds", embedObjects.toArray());
}

URL url = new URL(this.url);
HttpsURLConnection connection = (HttpsURLConnection)url.openConnection();
connection.addRequestProperty("Content-Type", "application/json");
connection.addRequestProperty("User-Agent", "Java-DiscordWebhook-BY-Gelox_");
connection.setDoOutput(true);
connection.setRequestMethod("POST");
OutputStream stream = connection.getOutputStream();
stream.write(json.toString().getBytes());
stream.flush();
stream.close();
connection.getInputStream().close();
connection.disconnect();
...