前幾天使用Apache 的POI操作ppt,后來發現轉成的圖片出現亂碼,而且處理了之后,還會有遺留
因此決定換一種處理方式
Jacob 是 JAVA-COM Bridge的縮寫,是一個中間件,能夠提供自動化訪問MS系統下COM組件和Win32 libraries的功能。
1.准備
(1)安裝MS Office
(2)使用spring boot 框架
(3)pom.xml 添加 jacob 依賴
<dependency> <groupId>net.sf.jacob-project</groupId> <artifactId>jacob</artifactId> <version>1.14.3</version> </dependency>
(4)安裝dll
在https://mvnrepository.com/ 查詢jacob,選擇第一個
選擇適合自己機器的dll文件
將下載下來的dll文件放在
C:\Program Files\Java\jdk1.8.0_151\bin C:\Program Files\Java\jdk1.8.0_151\jre\bin C:\WINDOWS\system32 C:\Program Files\Java\jre1.8.0_151\bin
其實只要在 C:\WINDOWS\system32下就可以找到了
2.使用
- MS系統提供的COM組件
COM組件 | 對象ID |
---|---|
MS Word | Word.Application |
MS Excel | Excel.Application |
MS Powerpoint | Powerpoint.Application |
重要的類和方法
JacobObject:用於Java程序MS下的COM進行通信,創建標准的API框架
ComThread:初始化COM組件線程,釋放線程,對線程進行管理
Dispatch:調度處理類,封裝了操作來從而操作Office,並表示不同MS級別調度對象
Dispatch.get(dispatch, String name);獲取對象屬性 Dispatch.put(dispatch, String name, Object value);設置對象屬性 Dispatch.call(dispatch, String name, Object… args);調用對象方法 ActiveXComponent : 創建COM組件 Variant : 與COM通訊的參數或者返回值
可以參考VBA API,使用Jacob操作COM組件 https://docs.microsoft.com/en-us/office/vba/api/powerpoint.slides.insertfromfile 查看
處理過程
初始化ComThread——》初始化應用——》設置應用屬性——》獲取應用屬性或對象,設置屬性參數——》調用屬性對應的方法
(1)ppt轉pdf
public BackRS ppt2Pdf(String sourcePath, String destPath,BackRS rs){ ActiveXComponent ppt = null; Dispatch presentations = null; try { ComThread.InitMTA(true); ppt = new ActiveXComponent("PowerPoint.application"); Dispatch.put(ppt.getObject(), "DisplayAlerts", new Variant(false)); presentations = ppt.invokeGetComponent("Presentations") .invokeGetComponent("Open", new Variant(sourcePath)); Dispatch.invoke(presentations, "SaveAs", Dispatch.Method, new Object[]{destPath, new Variant(32)}, new int[1]); rs.setFlag(true); rs.setMsg("pdf successfully converted."); rs.setPath(destPath); rs.setFileName(sourcePath); } catch (Exception e) { rs.setFlag(false); rs.setMsg(e.getMessage()); } finally { try { if (ppt != null) { ppt.invoke("Quit"); } } catch (Exception e) { rs.setFlag(false); rs.setMsg(e.getMessage()); } finally { if (presentations != null) presentations.safeRelease(); if (ppt != null) ppt.safeRelease(); ComThread.Release(); } } return rs; }
(2)ppt按頁保存圖片
public static final int PPT_SAVEAS_JPG = 17; public BackRS converter(String fileName){ BackRS rs = new BackRS(); ActiveXComponent ppt = null; Dispatch presentations = null; String source = fileName; File file = new File(source); if (!file.exists()) { rs.setFlag(false); rs.setMsg("轉換文件不存在"); return rs; } String filePath = file.getParent()+File.separator; String dest = filePath + getFileNameNoEx(file.getName())+"_JPG"; File destPath = new File(dest); if (!destPath.exists()) { destPath.mkdir(); } try { ComThread.InitMTA(true); ppt = new ActiveXComponent("PowerPoint.application"); Dispatch.put(ppt.getObject(), "DisplayAlerts", new Variant(false)); presentations = ppt.invokeGetComponent("Presentations").invokeGetComponent("Open", new Variant(source)); saveAs(presentations, dest, PPT_SAVEAS_JPG); rs.setFlag(true); rs.setMsg("Image successfully converted."); rs.setPath(dest); rs.setFileName(fileName); } catch (Exception e) { rs.setFlag(false); rs.setMsg(e.getMessage()); } finally { try { if (ppt != null) { ppt.invoke("Quit"); } } catch (Exception e) { rs.setFlag(false); rs.setMsg(e.getMessage()); } finally { if (presentations != null) presentations.safeRelease(); if (ppt != null) ppt.safeRelease(); ComThread.Release(); } } return rs; } public void saveAs(Dispatch presentation, String saveTo, int ppSaveAsFileType)throws Exception { Dispatch.call(presentation, "SaveAs", saveTo, new Variant( ppSaveAsFileType)); }
(3)ppt合並
public void merge(String outPutPPTPath, List<String> mergePPTPathList) { // 啟動 office PowerPoint程序 ActiveXComponent pptApp = null; Dispatch presentations = null; Dispatch outputPresentation; try { ComThread.InitMTA(true); pptApp = new ActiveXComponent("PowerPoint.Application"); Dispatch.put(pptApp, "Visible", new Variant(true)); presentations = pptApp.getProperty("Presentations").toDispatch(); File file = new File(outPutPPTPath); if (file.exists()) { file.delete(); } file.createNewFile(); // 打開輸出文件 outputPresentation = Dispatch.call(presentations, "Open", outPutPPTPath, false, false, true).toDispatch(); // 循環添加合並文件 for (String mergeFile : mergePPTPathList) { Dispatch mergePresentation = Dispatch.call(presentations, "Open", mergeFile, false, false, true).toDispatch(); Dispatch mergeSildes = Dispatch.get(mergePresentation, "Slides").toDispatch(); int mergePageNum = Integer.parseInt(Dispatch.get(mergeSildes, "Count").toString()); // 關閉合並文件 Dispatch.call(mergePresentation, "Close"); Dispatch outputSlides = Dispatch.call(outputPresentation, "Slides").toDispatch(); int outputPageNum = Integer.parseInt(Dispatch.get(outputSlides, "Count").toString()); // 追加待合並文件內容到輸出文件末尾 Dispatch.call(outputSlides, "InsertFromFile", mergeFile, outputPageNum, 1, mergePageNum); } // 保存輸出文件,關閉退出PowerPonit. Dispatch.call(outputPresentation, "Save"); Dispatch.call(outputPresentation, "Close"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (pptApp != null) { pptApp.invoke("Quit"); } } catch (Exception e) { e.printStackTrace(); } finally { if (presentations != null) presentations.safeRelease(); if (pptApp != null) pptApp.safeRelease(); ComThread.Release(); } } }
將mergePPTPathList 中的文件,追加到 outPutPPTPath文件中
下面的語句
Dispatch.call(outputSlides, "InsertFromFile", mergeFile, outputPageNum, 1, mergePageNum);
InsertFromFile( _FileName_, _Index_, _SlideStart_, _SlideEnd_ )
參考這個原型,可以實現追加指定的第umPage頁面
Dispatch.call(outputSlides, "InsertFromFile",mergeFile, outputPageNum, umPage, umPage);
說明:
(1)出現錯誤 Can't get object clsid from progid
檢查 dll文件都在指定位置,但還是報錯
后來發現原來參考的其他人的文章Jacob調用WPS將Office文件轉為PDF文件,對象ID不正確
其中 ppt = new ActiveXComponent("KWPP.Application");改為 ppt = new ActiveXComponent("PowerPoint.application");
(2)Can’t load IA 32-bit .dll on a AMD 64-bit platform
出現這個報錯是因為使用的jacob.dll和系統不匹配,把32位的用在了64位的系統上了,幾位的系統就用幾位jacob.dll
(3)如果不想用Office想用WPS,不能安裝極小安裝包