一、重要转换代码：
@Override public void transform(InputStream in, OutputStream out, String fileName) throws IOException { UUID uuid = UUID.randomUUID(); this.cacheFileName = fileName.substring(0, fileName.lastIndexOf(".")) + "-" + uuid; // 设置本地缓存的路径
String tmpPath = localHtmlCachePath + IOUtils.DIR_SEPARATOR + this.cacheFileName + ".pdf"; String lowerFileName = fileName.toLowerCase(); try { if (!new File(tmpPath).exists()) { if (lowerFileName.endsWith(".xls") || lowerFileName.endsWith(".xlsx") || lowerFileName.endsWith(".csv")) { com.aspose.cells.Workbook workbook = new com.aspose.cells.Workbook(in); workbook.save(tmpPath, com.aspose.cells.SaveFormat.PDF); } else if (lowerFileName.endsWith(".doc") || lowerFileName.endsWith(".docx") || lowerFileName.endsWith(".rtf")) { com.aspose.words.Document doc = new com.aspose.words.Document(in); doc.save(tmpPath, com.aspose.words.SaveFormat.PDF); } else if (lowerFileName.endsWith(".ppt") || lowerFileName.endsWith(".pptx") || lowerFileName.endsWith(".pps") || lowerFileName.endsWith(".ppsx")) { com.aspose.slides.Presentation ppt = new com.aspose.slides.Presentation(in); ppt.save(tmpPath, com.aspose.slides.SaveFormat.Pdf); } else if (lowerFileName.endsWith(".vdx") || lowerFileName.endsWith(".vsx") || lowerFileName.endsWith(".vtx") || lowerFileName.endsWith(".vsd") || lowerFileName.endsWith(".vsdx")) { com.aspose.diagram.Diagram visio = new com.aspose.diagram.Diagram(in); visio.save(tmpPath, com.aspose.diagram.SaveFileFormat.PDF); } else if (lowerFileName.endsWith(".pdf")) { com.aspose.pdf.Document pdf = new com.aspose.pdf.Document(in); pdf.save(tmpPath, com.aspose.pdf.SaveFormat.Pdf); } } if (out instanceof ResponseOutputStream) { HttpServletResponse response = ((ResponseOutputStream) out).getResponse(); response.sendRedirect("/filePreview/officeHtmlFileViwer/" + this.cacheFileName + ".pdf"); } } catch (Exception ex) { throw new RuntimeException(ex); } }
二、创建了一个maven 项目，用到的相关jar如下：
三、遇到问题：
1、缓存文件夹不存在则创建：
// 文件夹不存在则创建
if (!new File(localHtmlCachePath).exists()) { new File(localHtmlCachePath).mkdirs(); }
2、有水印：获取lic有问题：不能图省事，要以此次的获取InputStream（setLicense方法执行完可能是把InputStream给close了）
3、response.sendRedirect("/preview/officeHtmlFileViwer/" + this.cacheFileName + ".html");执行之后没有打开新页面
原因：不能close，因为还有请求在跑。
