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。
来源：/time-on/p/7126359.html
