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DOCX2PDF
将DOCX文档转化为PDF是项目中常见的需求之一，目前主流的方法可以分为两大类，一类是利用各种Office应用进行转换，譬如Microsoft Office、WPS以及LiberOffice，另一种是利用各种语言提供的对于Office文档读取的接口(譬如Apache POI)然后使用专门的PDFGenerator库，譬如IText进行PDF构建。总的来说，从样式上利用Office应用可以保证较好的样式，不过相对而言效率会比较低。其中Microsoft Office涉及版权，不可轻易使用(笔者所在公司就被抓包了)，WPS目前使用比较广泛，不过存在超链接截断问题，即超过256个字符的超链接会被截断，LiberOffice的样式排版相对比较随意。而利用POI接口进行读取与生成的方式性能较好，适用于对于格式要求不是很高的情况。另外还有一些封装好的在线工具或者命令行工具，譬如docx2pdf与OfficeToPDF。
MicroSoft Office
本部分的核心代码如下，全部代码参考这里:
private ActiveXComponent oleComponent = null; private Dispatch activeDoc = null; private final static String APP_ID = "Word.Application"; // Constants that map onto Word's WdSaveOptions enumeration and that // may be passed to the close(int) method public static final int DO_NOT_SAVE_CHANGES = 0; public static final int PROMPT_TO_SAVE_CHANGES = -2; public static final int SAVE_CHANGES = -1; // These constant values determine whether or not tha application // instance will be displyed on the users screen or not. public static final boolean VISIBLE = true; public static final boolean HIDDEN = false; /** * Create a new instance of the JacobWordSearch class using the following * parameters. * * @param visibility A primitive boolean whose value will determine whether * or not the Word application will be visible to the user. Pass true * to display Word, false otherwise. */ public OfficeConverter(boolean visibility) { this.oleComponent = new ActiveXComponent(OfficeConverter.APP_ID); this.oleComponent.setProperty("Visible", new Variant(visibility)); } /** * Open ana existing Word document. * * @param docName An instance of the String class that encapsulates the * path to and name of a valid Word file. Note that there are a few * limitations applying to the format of this String; it must specify * the absolute path to the file and it must not use the single forward * slash to specify the path separator. */ public void openDoc(String docName) { Dispatch disp = null; Variant var = null; // First get a Dispatch object referencing the Documents collection - for // collections, think of ArrayLists of objects. var = Dispatch.get(this.oleComponent, "Documents"); disp = var.getDispatch(); // Now call the Open method on the Documents collection Dispatch object // to both open the file and add it to the collection. It would be possible // to open a series of files and access each from the Documents collection // but for this example, it is simpler to store a reference to the // active document in a private instance variable. var = Dispatch.call(disp, "Open", docName); this.activeDoc = var.getDispatch(); } /** * There is more than one way to convert the document into PDF format, you * can either explicitly use a FileConvertor object or call the * ExportAsFixedFormat method on the active document. This method opts for * the latter and calls the ExportAsFixedFormat method passing the name * of the file along with the integer value of 17. This value maps onto one * of Word's constants called wdExportFormatPDF and causes the application * to convert the file into PDF format. If you wanted to do so, for testing * purposes, you could add another value to the args array, a Boolean value * of true. This would open the newly converted document automatically. * * @param filename */ public void publishAsPDF(String filename) { // The code to expoort as a PDF is 17 //Object args = new Object{filename, new Integer(17), new Boolean(true)}; Object args = new Object { filename, new Integer(17) } ; Dispatch.call(this.activeDoc, "ExportAsFixedFormat", args); } /** * Called to close the active document. Note that this method simply * calls the overloaded closeDoc(int) method passing the value 0 which * instructs Word to close the document and discard any changes that may * have been made since the document was opened or edited. */ public void closeDoc() { this.closeDoc(JacobWordSearch.DO_NOT_SAVE_CHANGES); } /** * Called to close the active document. It is possible with this overloaded * version of the close() method to specify what should happen if the user * has made changes to the document that have not been saved. There are three * possible value defined by the following manifest constants; * DO_NOT_SAVE_CHANGES - Close the document and discard any changes * the user may have made. * PROMPT_TO_SAVE_CHANGES - Display a prompt to the user asking them * how to proceed. * SAVE_CHANGES - Save the changes the user has made to the document. * * @param saveOption A primitive integer whose value indicates how the close * operation should proceed if the user has made changes to the active * document. Note that no checks are made on the value passed to * this argument. */ public void closeDoc(int saveOption) { Object args = {new Integer(saveOption)}; Dispatch.call(this.activeDoc, "Close", args); } /** * Called once processing has completed in order to close down the instance * of Word. */ public void quit() { Dispatch.call(this.oleComponent, "Quit"); }WPS
Java调用WPS或pdfcreator的com接口实现doc转pdf
本文的核心代码如下，完整代码查看这里:
@Override public boolean convert(String word, String pdf) { File pdfFile = new File(pdf); File wordFile = new File(word); boolean convertSuccessfully = false; ActiveXComponent wps = null; ActiveXComponent doc = null; try { wps = new ActiveXComponent("KWPS.Application"); // Dispatch docs = wps.getProperty("Documents").toDispatch(); // Dispatch d = Dispatch.call(docs, "Open", wordFile.getAbsolutePath(), false, true).toDispatch(); // Dispatch.call(d, "SaveAs", pdfFile.getAbsolutePath(), 17); // Dispatch.call(d, "Close", false); doc = wps.invokeGetComponent("Documents") .invokeGetComponent("Open", new Variant(wordFile.getAbsolutePath())); try { doc.invoke("SaveAs", new Variant(new File("C:\\Users\\lotuc\\Documents\\mmm.pdf").getAbsolutePath()), new Variant(17)); convertSuccessfully = true; } catch (Exception e) { logger.warning("生成PDF失败"); e.printStackTrace(); } File saveAsFile = new File("C:\\Users\\lotuc\\Documents\\saveasfile.doc"); try { doc.invoke("SaveAs", saveAsFile.getAbsolutePath()); logger.info("成功另存为" + saveAsFile.getAbsolutePath()); } catch (Exception e) { logger.info("另存为" + saveAsFile.getAbsolutePath() + "失败"); e.printStackTrace(); } } finally { if (doc == null) { logger.info("打开文件 " + wordFile.getAbsolutePath() + " 失败"); } else { try { logger.info("释放文件 " + wordFile.getAbsolutePath()); doc.invoke("Close"); doc.safeRelease(); } catch (Exception e1) { logger.info("释放文件 " + wordFile.getAbsolutePath() + " 失败"); } } if (wps == null) { logger.info("加载 WPS 控件失败"); } else { try { logger.info("释放 WPS 控件"); wps.invoke("Quit"); wps.safeRelease(); } catch (Exception e1) { logger.info("释放 WPS 控件失败"); } } } return convertSuccessfully; }LiberOffice
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