将Freemarker转换为PDF

    try {
        Configuration cfg = new Configuration();
        Template tpl = cfg.getTemplate(\"example.ftl\");
        OutputStreamWriter output = new OutputStreamWriter(System.out);

        Map testHashMap = new HashMap();
        testHashMap.put(\"test\", \"testValue\");

        tpl.process(testHashMap, output);

    } catch (Exception e) {
        e.printStackTrace();
    }

try {
    DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    Document doc = builder.parse(new StringBufferInputStream(buf.toString()));
    ITextRenderer renderer = new ITextRenderer();
    renderer.setDocument(doc, null);
    renderer.layout();
    OutputStream os = response.getOutputStream();
    renderer.createPDF(os);
    os.close();
} catch (Exception ex) {
    ex.printStackTrace();
}