如何將內容寫入pdf？ Google雲端存儲服務

Question

如何創建pdf到gcs中，並插入一些數據？

這是我的代碼：

GcsService gcsService = GcsServiceFactory.createGcsService(new RetryParams.Builder() 
      .initialRetryDelayMillis(10) 
      .retryMaxAttempts(10) 
      .totalRetryPeriodMillis(15000) 
      .build()); 

      GcsFilename filename = new GcsFilename("areteaics", "test.pdf"); 
      GcsFileOptions options = new GcsFileOptions.Builder().mimeType("application/pdf").build(); 
      GcsOutputChannel writeChannel = gcsService.createOrReplace(filename,options);   
      PrintWriter out = new PrintWriter(Channels.newWriter(writeChannel, "UTF8")); 
      //out.println("The woods are lovely dark and deep."); 
      //out.println("But I have promises to keep."); 
      //out.flush(); 
      writeChannel.waitForOutstandingWrites(); 
      //writeChannel.write(ByteBuffer.wrap("And miles to go before I sleep.".getBytes())); 
      writeChannel.close(); 

Answer 1

就像你正在創建一個PDF格式的文件（你要做的僅僅是擴展名爲PDF文件）不看。您需要使用像itext這樣的庫來創建pdf文件，然後將其寫入到cloudstorage。

e.g利用iText寫的OutputStream src：

Document document = new Document(); 
    PdfWriter.getInstance(document, response.getOutputStream()); 
    document.open(); 
    document.add(new Paragraph("This is a paragraph")); 
    document.close(); 

你需要修改上面的代碼寫入到GCS（而不是響應的OutputStream）。