ConvertPDF服務 convertpdf-service

Last update: Wed Mar 20 2024 00:00:00 GMT+0000 (Coordinated Universal Time)

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Document Services

概觀 overview

「轉換PDF」服務會將PDF檔案轉換為PostScript或影像檔案(JPEG、JPEG2000、PNG和TIFF)。將PDF檔案轉換為PostScript對於任何PostScript印表機上的自動伺服器式列印很有用。將PDF檔案轉換為多頁TIFF檔案對於在不支援PDF檔案的內容管理系統中封存檔案而言是切實可行的。

您可以使用轉換PDF服務來達到下列目的：

將PDF檔案轉換為PostScript。轉換為PostScript時，您可以使用轉換作業來指定來原始檔，以及是否要轉換成PostScript第2級或第3級。您轉換成PostScript檔案的PDF檔案必須是非互動式的。
將PDF檔案轉換為JPEG、JPEG2000、PNG和TIFF影像格式。當轉換為任何這些影像格式時，您可以使用轉換作業來指定來原始檔和影像選項規格。規格包含各種偏好設定，例如影像轉換格式、影像解析度和色彩轉換。

設定服務的屬性 properties

您可以使用 AEMFD ConvertPDF服務 在AEM Console中設定此服務的屬性。 AEM主控台的預設URL為 https://[host]:'port'/system/console/configMgr.

使用服務 using-the-service

ConvertPDF服務提供下列兩個API：

toPS：將PDF檔案轉換為PostScript檔案。
toImage：將PDF檔案轉換為影像檔案。支援的影像格式為JPEG、JPEG2000、PNG和TIFF。

搭配JSP或Servlet使用toPS API using-tops-api-with-a-jsp-or-servlets

<%@ page import="java.util.List, java.io.File,

                com.adobe.fd.cpdf.api.ConvertPdfService,
                com.adobe.fd.cpdf.api.ToPSOptionsSpec,
                com.adobe.fd.cpdf.api.enumeration.PSLevel,

                com.adobe.aemfd.docmanager.Document" %><%
%><%@taglib prefix="sling" uri="https://sling.apache.org/taglibs/sling/1.0" %><%
%><sling:defineObjects/><%

 // Get reference to ConvertPdfService OSGi service.
 // Within an OSGi bundle @Reference annotation
 // can be used to retrieve service reference

 ConvertPdfService cpdfService = sling.getService(ConvertPdfService.class);

 // path to input document in AEM repository
 // replace this with path to your document
String documentPath = "/content/dam/formsanddocuments/ExpenseClaimFlat.pdf";

 // Create a Docmanager Document object for
 // the flat PDF file which needs to be converted
 // to PostScript

 Document inputPDF = new Document(documentPath);

 // options object to pass to toPS API
 ToPSOptionsSpec toPSOptions = new ToPSOptionsSpec();

 // mandatory option to pass, sets PostScript language
 toPSOptions.setPsLevel(PSLevel.LEVEL_3);

 // invoke toPS method to convert inputPDF to PostScript
 Document convertedPS = cpdfService.toPS(inputPDF, toPSOptions);

 // save converted PostScript file to disk
 convertedPS.copyToFile(new File("C:/temp/out.ps"));

%>

搭配JSP或Servlet使用toImage API using-toimage-api-with-a-jsp-or-servlets

<%@ page import="java.util.List, java.io.File,

                com.adobe.fd.cpdf.api.ConvertPdfService,
                com.adobe.fd.cpdf.api.ToImageOptionsSpec,
                com.adobe.fd.cpdf.api.enumeration.ImageConvertFormat,

                com.adobe.aemfd.docmanager.Document" %><%
%><%@taglib prefix="sling" uri="https://sling.apache.org/taglibs/sling/1.0" %><%
%><sling:defineObjects/><%

 // Get reference to ConvertPdfService OSGi service.
 // Within an OSGi bundle @Reference annotation
 // can be used to retrieve service reference

 ConvertPdfService cpdfService = sling.getService(ConvertPdfService.class);

 // path to input document in AEM repository
 // replace this with path to your document
 String documentPath = "/content/dam/formsanddocuments/ExpenseClaimFlat.pdf";

 // Create a Docmanager Document object for
 // the flat PDF file which needs to be converted
 // to image

 Document inputPDF = new Document(documentPath);

 // options object to pass to toImage API
 ToImageOptionsSpec toImageOptions = new ToImageOptionsSpec();

 // mandatory option to pass, image format
 toImageOptions.setImageConvertFormat(ImageConvertFormat.JPEG);

 // invoke toImage method to convert inputPDF to Image
 List<Document> convertedImages = cpdfService.toImage(inputPDF, toImageOptions);

 // save converted image files to disk
 for(int i=0;i<convertedImages.size();i++){
     Document pageImage = convertedImages.get(i);
     pageImage.copyToFile(new File("C:/temp/out_"+(i+1)+".jpeg"));
 }

%>

搭配AEM工作流程使用ConvertPDF服務 using-convertpdf-service-with-aem-workflows

從工作流程執行ConvertPDF服務類似於從JSP/Servlet執行。

唯一的差別是從JSP/Servlet執行服務，檔案物件會自動從ResourceResolverHelper物件擷取ResourceResolver物件的執行個體。從工作流程呼叫程式碼時，此自動機制無法運作。對於工作流程，請將ResourceResolver物件的執行個體明確傳遞給Document類別建構函式。接著，Document物件會使用提供的ResourceResolver物件來讀取存放庫中的內容。

下列範例工作流程程式會將輸入檔案轉換為PostScript檔案。程式碼會以ECMAScript撰寫，而檔案會以工作流程裝載的方式傳遞：

/*
 * Imports
 */
var ConvertPdfService = Packages.com.adobe.fd.cpdf.api.ConvertPdfService;
var ToPSOptionsSpec = Packages.com.adobe.fd.cpdf.api.ToPSOptionsSpec;
var PSLevel = Packages.com.adobe.fd.cpdf.api.enumeration.PSLevel;
var Document = Packages.com.adobe.aemfd.docmanager.Document;
var File = Packages.java.io.File;
var ResourceResolverFactory = Packages.org.apache.sling.api.resource.ResourceResolverFactory;

// get reference to ConvertPdfService
var cpdfService = sling.getService(ConvertPdfService);

/*
 * workflow payload and path to it
 */
var payload = graniteWorkItem.getWorkflowData().getPayload();
var payload_path = payload.toString();

/* Create resource resolver using current session
 * this resource resolver needs to be passed to Document
 * object constructor when file is to be read from
 * crx repository.
 */

/* get ResourceResolverFactory service reference , used
 * to construct resource resolver
 */
var resourceResolverFactory = sling.getService(ResourceResolverFactory);

var authInfo = {
    "user.jcr.session":graniteWorkflowSession.getSession()
};

var resourceResolver = resourceResolverFactory.getResourceResolver(authInfo);

// Create Document object from payload_path
var inputDocument = new Document(payload_path, resourceResolver);

// options object to be passed to toPS operation
var toPSOptions = new ToPSOptionsSpec();

// Set PostScript Language Three
toPSOptions.setPsLevel(PSLevel.LEVEL_3);

// invoke toPS operation to convert inputDocument to PS
var convertedPS = cpdfService.toPS(inputDocument, toPSOptions);

// save converted PostScript file to disk
convertedPS.copyToFile(new File("C:/temp/out.ps"));

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