code: public static String getDefaultPortForScheme(final String scheme) {
          if ("ftp".equals(scheme)) {
              return "21";
          }
          if ("file".equals(scheme)) {
              return null;
          }
          if ("gopher".equals(scheme)) {
              return "70";
          }
          if ("http".equals(scheme)) {
              return "80";
          }
          if ("https".equals(scheme)) {
              return "443";
          }
          if ("ws".equals(scheme)) {
              return "80";
          }
          if ("wss".equals(scheme)) {
              return "443";
          }
          return null;
      }
docs: Gets the default port for a given schema. That is:
  
  <ol>
  <li>ftp - 21</li>
  <li>file - null</li>
  <li>gopher - 70</li>
  <li>http - 80</li>
  <li>https - 443</li>
  <li>ws - 80</li>
  <li>wss - 433</li>
  </ol>
  
  @param scheme
  @return