我可以在通过 Chrome Rest Client 插件测试 JAX-RS 服务时保存 PDF，但它没有内容。任何想法为什么此代码会生成没有内容的 PDF？
@Produces("application/pdf")
@GET
@Path("/{id}")
public Response getPdfById(@PathParam("id") Long id) {
StreamingOutput stream = new StreamingOutput() {
@Override
public void write(OutputStream output) throws IOException, WebApplicationException {
try {
StringBuffer buf = new StringBuffer();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
buf.append("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\"");
buf.append(" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">");
buf.append("<html xmlns=\"http://www.w3.org/1999/xhtml\">");
buf.append("<head>");
buf.append("<title>My First Document</title>");
buf.append("<style type=\"text/css\"> b { color: green; } </style>");
buf.append("</head>");
buf.append("<body>");
buf.append("<p>");
buf.append("<b>Hi there!!!</b>");
buf.append("</p>");
buf.append("</body>");
buf.append("</html>");
LOG.info("-----------");
LOG.info("HTML OUTPUT");
LOG.info("-----------");
LOG.info(buf.toString());
// parse our markup into an xml Document
try {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(new StringBufferInputStream(buf.toString()));
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(doc, null);
renderer.layout();
renderer.createPDF(output);
output.close();
} catch (Exception ex) {
ex.printStackTrace();
}
} catch (Exception e) {
throw new WebApplicationException(e);
}
}
};
return Response.ok(stream).header("Content-Disposition","attachment; filename=orderingPdfTest.pdf").build();
}