Java tutorial
package com.viewer.servlets; import com.fasterxml.jackson.databind.ObjectMapper; import com.groupdocs.viewer.converter.options.ConvertImageFileType; import com.groupdocs.viewer.converter.options.FileDataOptions; import com.groupdocs.viewer.converter.options.HtmlOptions; import com.groupdocs.viewer.domain.FileData; import com.groupdocs.viewer.domain.PageData; import com.groupdocs.viewer.domain.containers.DocumentInfoContainer; import com.groupdocs.viewer.domain.html.HtmlResource; import com.groupdocs.viewer.domain.html.HtmlResourceType; import com.groupdocs.viewer.domain.html.PageHtml; import com.groupdocs.viewer.domain.options.DocumentInfoOptions; import com.viewer.ViewerUtils; import com.viewer.model.*; import com.viewer.model.helper.DotNetToJavaStringHelper; import com.viewer.model.helper.ImageUrlHelper; import com.viewer.model.helper.RefObject; import org.apache.commons.io.IOUtils; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.text.ParseException; import java.util.*; import java.util.concurrent.locks.ReentrantLock; @WebServlet("/ViewDocument") public class ViewDocument extends HttpServlet { private static String _locales = (System.getProperty("user.dir") + "\\src\\main\\webapp\\storage\\temp\\") .replace("\\", "/"); final ReentrantLock lock = new ReentrantLock(); private final ConvertImageFileType _convertImageFileType = ConvertImageFileType.JPG; public String _licensePath = "D:\\GroupDocs.Total.Java.lic"; List<String> temp_cssList; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.addHeader("Content-Type", "application/json"); ViewDocumentParameters params = new ObjectMapper().readValue(request.getInputStream(), ViewDocumentParameters.class); ViewDocumentResponse result = new ViewDocumentResponse(); FileData fileData = ViewerUtils.factoryFileData(params.getPath()); DocumentInfoContainer docInfo = null; try { result.setDocumentDescription( (new FileDataJsonSerializer(fileData, new FileDataOptions())).Serialize(false)); } catch (ParseException x) { throw new ServletException(x); } if (params.getUseHtmlBasedEngine()) { try { docInfo = ViewerUtils.getViewerHtmlHandler() .getDocumentInfo(new DocumentInfoOptions(params.getPath())); } catch (Exception x) { throw new ServletException(x); } result.setPageCss(new String[0]); result.setLic(true); result.setPdfDownloadUrl(GetPdfDownloadUrl(params)); result.setPdfPrintUrl(GetPdfPrintUrl(params)); result.setUrl(GetFileUrl(params)); result.setPath(params.getPath()); result.setName(params.getPath()); try { result.setDocumentDescription( (new FileDataJsonSerializer(fileData, new FileDataOptions())).Serialize(false)); } catch (ParseException x) { throw new ServletException(x); } result.setDocType(docInfo.getDocumentType()); result.setFileType(docInfo.getFileType()); HtmlOptions htmlOptions = new HtmlOptions(); htmlOptions.setResourcesEmbedded(true); htmlOptions.setHtmlResourcePrefix("/GetResourceForHtml?documentPath=" + params.getPath() + "&pageNumber={page-number}&resourceName="); if (!DotNetToJavaStringHelper.isNullOrEmpty(params.getPreloadPagesCount().toString()) && params.getPreloadPagesCount().intValue() > 0) { htmlOptions.setPageNumber(1); htmlOptions.setCountPagesToConvert(params.getPreloadPagesCount().intValue()); } String[] cssList = null; RefObject<ArrayList<String>> tempRef_cssList = new RefObject<ArrayList<String>>(cssList); List<PageHtml> htmlPages; try { htmlPages = GetHtmlPages(params.getPath(), htmlOptions); cssList = tempRef_cssList.argValue; ArrayList<String> pagesContent = new ArrayList<String>(); for (PageHtml page : htmlPages) { pagesContent.add(page.getHtmlContent()); } String[] htmlContent = pagesContent.toArray(new String[0]); result.setPageHtml(htmlContent); result.setPageCss(new String[] { String.join(" ", temp_cssList) }); for (int i = 0; i < result.getPageHtml().length; i++) { String html = result.getPageHtml()[i]; int indexOfScript = html.indexOf("script"); if (indexOfScript > 0) { result.getPageHtml()[i] = html.substring(0, indexOfScript); } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { try { docInfo = ViewerUtils.getViewerImageHandler() .getDocumentInfo(new DocumentInfoOptions(params.getPath())); } catch (Exception x) { throw new ServletException(x); } int maxWidth = 0; int maxHeight = 0; for (PageData pageData : docInfo.getPages()) { if (pageData.getHeight() > maxHeight) { maxHeight = pageData.getHeight(); maxWidth = pageData.getWidth(); } } fileData.setDateCreated(new Date()); fileData.setDateModified(docInfo.getLastModificationDate()); fileData.setPageCount(docInfo.getPages().size()); fileData.setPages(docInfo.getPages()); fileData.setMaxWidth(maxWidth); fileData.setMaxHeight(maxHeight); result.setPageCss(new String[0]); result.setLic(true); result.setPdfDownloadUrl(GetPdfDownloadUrl(params)); result.setPdfPrintUrl(GetPdfPrintUrl(params)); result.setUrl(GetFileUrl(params.getPath(), true, false, params.getFileDisplayName(), params.getWatermarkText(), params.getWatermarkColor(), params.getWatermarkPostion(), params.getWatermarkWidth(), params.getIgnoreDocumentAbsence(), params.getUseHtmlBasedEngine(), params.getSupportPageRotation())); result.setPath(params.getPath()); result.setName(params.getPath()); result.setDocType(docInfo.getDocumentType()); result.setFileType(docInfo.getFileType()); int[] pageNumbers = new int[docInfo.getPages().size()]; int count = 0; for (PageData page : docInfo.getPages()) { pageNumbers[count] = page.getNumber(); count++; } String applicationHost = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort(); String[] imageUrls = ImageUrlHelper.GetImageUrls(applicationHost, pageNumbers, params); result.setImageUrls(imageUrls); } new ObjectMapper().writeValue(response.getOutputStream(), result); } //////////////////////////////////////////////////////////////////////////////////////////////////// public final String GetFileUrl(String path, boolean getPdf, boolean isPrintable, String fileDisplayName, String watermarkText, Integer watermarkColor, WatermarkPosition watermarkPosition, Float watermarkWidth, boolean ignoreDocumentAbsence, boolean useHtmlBasedEngine, boolean supportPageRotation) { Map<String, String> queryString = new LinkedHashMap<String, String>(); String myUrl = "path=" + path; queryString.put("path", path); if (!isPrintable) { queryString.put("getPdf", String.valueOf(getPdf).toLowerCase()); myUrl = myUrl + "&getPdf=" + String.valueOf(getPdf).toLowerCase(); if (fileDisplayName != null) { queryString.put("displayName", fileDisplayName); } } if (watermarkText != null) { queryString.put("watermarkText", watermarkText); queryString.put("watermarkColor", watermarkColor.toString()); if (watermarkPosition != null) { queryString.put("watermarkPosition", watermarkPosition.toString()); } if (watermarkWidth != null) { queryString.put("watermarkWidth", (new Float((float) watermarkWidth)).toString()); } } if (ignoreDocumentAbsence) { queryString.put("ignoreDocumentAbsence", String.valueOf(ignoreDocumentAbsence).toLowerCase()); } queryString.put("useHtmlBasedEngine", String.valueOf(useHtmlBasedEngine).toLowerCase()); myUrl = myUrl + "&useHtmlBasedEngine=" + String.valueOf(useHtmlBasedEngine).toLowerCase(); queryString.put("supportPageRotation", String.valueOf(supportPageRotation).toLowerCase()); myUrl = myUrl + "&supportPageRotation=" + String.valueOf(supportPageRotation).toLowerCase(); String handlerName = isPrintable ? "GetPdfWithPrintDialog" : "GetFile"; String baseUrl = "http://localhost:8080/" + handlerName + "?" + myUrl; String fileUrl = baseUrl + handlerName + queryString; return baseUrl; } public String GetPdfDownloadUrl(ViewDocumentParameters parameters) { return GetFileUrl(parameters.getPath(), true, false, parameters.getFileDisplayName(), parameters.getWatermarkText(), parameters.getWatermarkColor(), parameters.getWatermarkPostion(), parameters.getWatermarkWidth(), parameters.getIgnoreDocumentAbsence(), parameters.getUseHtmlBasedEngine(), parameters.getSupportPageRotation()); } private String GetPdfPrintUrl(ViewDocumentParameters request) { return GetFileUrl(request.getPath(), true, true, request.getFileDisplayName(), request.getWatermarkText(), request.getWatermarkColor(), request.getWatermarkPostion(), request.getWatermarkWidth(), request.getIgnoreDocumentAbsence(), request.getUseHtmlBasedEngine(), request.getSupportPageRotation()); } private String GetFileUrl(ViewDocumentParameters request) { return GetFileUrl(request.getPath(), false, false, request.getFileDisplayName(), null, null, null, null, false, false, false); } private List<PageHtml> GetHtmlPages(String filePath, HtmlOptions htmlOptions) throws Exception { List<PageHtml> htmlPages = null; try { htmlPages = ViewerUtils.getViewerHtmlHandler().getPages(filePath, htmlOptions); } catch (Exception x) { throw new ServletException(x); } temp_cssList = new ArrayList<String>(); for (PageHtml page : htmlPages) { String fullHtml = page.getHtmlContent(); String strippedHtml = ""; if (fullHtml.indexOf("</title>") > 0 && fullHtml.indexOf("</head>") > 0) { strippedHtml += fullHtml.substring(fullHtml.indexOf("</title>") + "</title>".length(), fullHtml.indexOf("</head>")); } if (fullHtml.indexOf("<body>") > 0 && fullHtml.indexOf("</body>") > 0) { strippedHtml += fullHtml.substring(fullHtml.indexOf("<body>") + "<body>".length(), fullHtml.indexOf("</body>")); } page.setHtmlContent(strippedHtml); for (HtmlResource resource : page.getHtmlResources()) { if (resource.getResourceType() == HtmlResourceType.Style) { InputStream cssStream = ViewerUtils.getViewerHtmlHandler().getResource(filePath, resource); String text = IOUtils.toString(cssStream, "UTF-8"); boolean needResave = false; if (text.indexOf("url(\"") >= 0 && text.indexOf("url(\"/GetResourceForHtml?documentPath=") < 0) { needResave = true; text = text.replace("url(\"", "url(\"/GetResourceForHtml?documentPath=" + filePath + "&pageNumber=" + resource.getDocumentPageNumber() + "&resourceName="); } if (text.indexOf("url('") >= 0 && text.indexOf("url('/GetResourceForHtml?documentPath=") < 0) { needResave = true; text = text.replace("url('", String.format("url(\'/GetResourceForHtml?documentPath=" + filePath + "&pageNumber=" + resource.getDocumentPageNumber() + "&resourceName=")); } temp_cssList.add(text); if (needResave) { String fullPath = ViewerUtils.TEMP_PATH + filePath + "/" + "html" + "/" + "resources" + "/" + "page" + page.getPageNumber() + "/" + resource.getResourceName(); File file = new File(fullPath); // if file doesnt exists, then create it if (!file.exists()) { file.getParentFile().mkdirs(); file.createNewFile(); } FileWriter fw = new FileWriter(file.getAbsoluteFile()); BufferedWriter bw = new BufferedWriter(fw); bw.write(text); bw.close(); } } ///////////////////////// } ArrayList<String> cssClasses = Utils.GetCssClasses(page.getHtmlContent()); for (String cssClass : cssClasses) { String newCssClass = "page-" + page.getPageNumber() + "-" + cssClass; page.setHtmlContent(page.getHtmlContent().replace(cssClass, newCssClass)); for (int i = 0; i < temp_cssList.size(); i++) { temp_cssList.set(i, temp_cssList.get(i).replace(cssClass, newCssClass)); } } } return htmlPages; } }