做word文件線上預覽，把word轉化成html後，裡面的公式的格式為.wmf格式，在瀏覽器中不能顯示，故我把wmf格式轉化成svg格式，這樣就能在瀏覽器中顯示了

    //wmf格式的圖片轉換成svg格式
    private void convert(String file,String dest) throws Exception{
        InputStream in = new FileInputStream(file);
        WmfParser parser = new WmfParser();
        final SvgGdi gdi = new SvgGdi(false);
        parser.parse(in, gdi);
        Document doc = gdi.getDocument();
        OutputStream out = new FileOutputStream(dest);
        if (dest.endsWith(".svgz")) {
            out = new GZIPOutputStream(out);
        }
        output(doc, out);
   }

   private void output(Document doc, OutputStream out) throws Exception {
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        transformer.setOutputProperty(OutputKeys.METHOD, "xml");
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC,"-//W3C//DTD SVG 1.0//EN");
        transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd");
        transformer.transform(new DOMSource(doc), new StreamResult(out));
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        transformer.transform(new DOMSource(doc), new StreamResult(bos));
        out.flush();
        out.close();
}