通过电子邮件发送Java中AbstractPdfView的PDF

我使用AbstractPdfView类生成pdf并在浏览器中下载，但我还需要通过电子邮件发送。我知道解决办法是显而易见的，但我已经被困在这个问题上一天了，看不到它。以下是我迄今为止的情况：

@GetMapping()
public PdfView generate(Model model, @RequestParam int event) {

  model.addAttribute("event", eventService.getEventById(event));

  return new PdfView();


}

这是PdfView类：

public class PdfView extends AbstractPdfView {

   @Override
   protected void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer, HttpServletRequest request, HttpServletResponse response) throws Exception {

        //add the iformation for the pdf
        document.add(getInvoiceInfo());

   }
}

public abstract class AbstractPdfView extends AbstractView {

   public AbstractPdfView() {
      setContentType("application/pdf");
   }

   @Override
   protected boolean generatesDownloadContent() {
      return true;
   }

   @Override
   protected final void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {

  ByteArrayOutputStream out = createTemporaryOutputStream();

  Document document = new Document(PageSize.A4.rotate(), 35, 35, 50, 36);
  PdfWriter writer = PdfWriter.getInstance(document, out);
  prepareWriter(model, writer, request);
  buildPdfMetadata(model, document, request);

  document.open();
  buildPdfDocument(model, document, writer, request, response);
  document.close();

    //i know i has to happen before this bit here but not sure how
   writeToResponse(response, out);

}

   protected void prepareWriter(Map<String, Object> model, PdfWriter writer, HttpServletRequest request) throws DocumentException {
      writer.setViewerPreferences(getViewerPreferences());
   }

   protected int getViewerPreferences() {
      return PdfWriter.ALLOW_PRINTING | PdfWriter.PageLayoutSinglePage;
   }


   protected void buildPdfMetadata(Map<String, Object> model, Document document, HttpServletRequest request) {
   }

   protected abstract void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer,
                                            HttpServletRequest request, HttpServletResponse response) throws Exception;
}

public类PdfView扩展了AbstractPdfView{
@凌驾
受保护的void buildPdfDocument（映射模型、文档文档、PdfWriter编写器、HttpServletRequest请求、HttpServletResponse响应）引发异常{
//添加pdf的格式
document.add（getInvoiceInfo（））；
}
}

这就是AbstractPdfView类：

public class PdfView extends AbstractPdfView {

   @Override
   protected void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer, HttpServletRequest request, HttpServletResponse response) throws Exception {

        //add the iformation for the pdf
        document.add(getInvoiceInfo());

   }
}

public abstract class AbstractPdfView extends AbstractView {

   public AbstractPdfView() {
      setContentType("application/pdf");
   }

   @Override
   protected boolean generatesDownloadContent() {
      return true;
   }

   @Override
   protected final void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {

  ByteArrayOutputStream out = createTemporaryOutputStream();

  Document document = new Document(PageSize.A4.rotate(), 35, 35, 50, 36);
  PdfWriter writer = PdfWriter.getInstance(document, out);
  prepareWriter(model, writer, request);
  buildPdfMetadata(model, document, request);

  document.open();
  buildPdfDocument(model, document, writer, request, response);
  document.close();

    //i know i has to happen before this bit here but not sure how
   writeToResponse(response, out);

}

   protected void prepareWriter(Map<String, Object> model, PdfWriter writer, HttpServletRequest request) throws DocumentException {
      writer.setViewerPreferences(getViewerPreferences());
   }

   protected int getViewerPreferences() {
      return PdfWriter.ALLOW_PRINTING | PdfWriter.PageLayoutSinglePage;
   }


   protected void buildPdfMetadata(Map<String, Object> model, Document document, HttpServletRequest request) {
   }

   protected abstract void buildPdfDocument(Map<String, Object> model, Document document, PdfWriter writer,
                                            HttpServletRequest request, HttpServletResponse response) throws Exception;
}

公共抽象类AbstractPdfView扩展了AbstractView{
公共摘要PDFView（）{
setContentType（“应用程序/pdf”）；
}
@凌驾
受保护的布尔生成下载内容（）{
返回true；
}
@凌驾
受保护的最终无效RenderMergeDoutpModel（映射模型、HttpServletRequest请求、HttpServletResponse响应）引发异常{
ByteArrayOutstream out=createTemporaryOutputStream（）；
文档=新文档（PageSize.A4.rotate（），35,35,50,36）；
PdfWriter writer=PdfWriter.getInstance（文档，输出）；
准备编写器（型号、编写器、请求）；
buildPdfMetadata（模型、文档、请求）；
document.open（）；
构建PDF文档（模型、文档、编写者、请求、响应）；
document.close（）；
//我知道我必须在这之前发生，但不知道怎么做
writeToResponse（响应，输出）；
}
受保护的void prepareWriter（映射模型、PdfWriter编写器、HttpServletRequest请求）引发DocumentException{
setViewerPreferences（getViewerPreferences（））；
}
受保护的int getViewerPreferences（）{
返回PdfWriter.ALLOW|u PRINTING | PdfWriter.PageLayoutSinglePage；
}
受保护的void buildPdfMetadata（映射模型、文档文档、HttpServletRequest）{
}
受保护的抽象无效构建PDF文档（地图模型、文档文档、PDF编写器、，
HttpServletRequest请求、HttpServletResponse响应）引发异常；
}

---

欢迎任何帮助！谢谢大家。

我已经做到了。如果有人遇到这个问题，就把它贴在这里。我基本上在AbstractPdfView的实现中自动连接了emailService，用它调用抽象类的构造函数。这里还有一本关于这个主题的好书：

您使用的是哪个pdf库？很抱歉，我没有提到这一点。是iText。请参考此