code: public void startImport(I_CmsReport report) throws Exception {
  
          try {
              m_report = report;
              m_report.println(Messages.get().container(Messages.RPT_HTML_IMPORT_BEGIN_0), I_CmsReport.FORMAT_HEADLINE);
  
              boolean isStream = !CmsStringUtil.isEmptyOrWhitespaceOnly(m_httpDir);
              File streamFolder = null;
              if (isStream) {
                  // the input is starting through the HTTP upload
                  streamFolder = unzipStream();
                  m_inputDir = streamFolder.getAbsolutePath();
              }
  
              // first build the index of all resources
              buildIndex(m_inputDir);
              // build list with all parent resources of input directory for links to outside import folder
              buildParentPath();
              // copy and parse all HTML files first. during the copy process we will collect all
              // required data for downloads and images
              copyHtmlFiles(m_inputDir);
              // now copy the other files
              copyOtherFiles(m_inputDir);
              // finally create all the external links
              createExternalLinks();
  
              if (isStream && (streamFolder != null)) {
                  m_report.println(Messages.get().container(Messages.RPT_HTML_DELETE_0), I_CmsReport.FORMAT_NOTE);
                  // delete the files of the zip file
                  CmsFileUtil.purgeDirectory(streamFolder);
                  // deletes the zip file
                  File file = new File(m_httpDir);
                  if (file.exists() && file.canWrite()) {
                      file.delete();
                  }
              }
              m_report.println(Messages.get().container(Messages.RPT_HTML_IMPORT_END_0), I_CmsReport.FORMAT_HEADLINE);
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
docs: Imports all resources from the real file system, stores them into the correct locations
  in the OpenCms VFS and modifies all links. This method is called form the JSP to start the
  import process.<p>
  
  @param report StringBuffer for reporting
  
  @throws Exception if something goes wrong