将好字符打印成坏字符未知字符

Question

PDF文件包含一些法语重音字符，例如：e上面带有一些刻度标记，与u左右相同。

当我在打印前检查PDF文件时，我可以看到它们是完全正确的，我可以用PDF阅读它们，我可以放大并完全复制它们。

但Java接触它并打印它的那一刻。一切都没有按照预期的那样发挥作用。

我该如何解决？该PDF的云版本是完美的，但是一旦我的以下代码用于处理文件，那么所有这些字符在打印副本中都会被破坏。

import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.print.DocPrintJob;
import javax.print.PrintService;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.MediaTray;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.printing.PDFPageable;

public class PrintA4 {

  public static boolean saveFile(URL url, String file) throws IOException {
    boolean download_status = false;

    System.out.println("open");
    InputStream in = url.openStream();
    FileOutputStream fos = new FileOutputStream(new File(file));
    System.out.println("reading file...");
    int length = -1;
    byte[] buffer = new byte[1024];

    while ((length = in.read(buffer)) > -1) {
        fos.write(buffer, 0, length);
    }
    fos.close();
    in.close();

    download_status = true;
    System.out.println("downloaded");
    return download_status;
  }

  public static void main(String[] args) throws IOException, PrinterException {  

    String downloaded_filename = "C:/pdf.pdf";
    String download_pdf_from = "http://www.example.com/1.pdf" ;
    String downloaded_filename_open_as_pdf = "C:\\pdf.pdf";
    String printerNameDesired = "Brother HL-6180DW series";

    PrintService[] services = PrinterJob.lookupPrintServices();
    DocPrintJob docPrintJob = null;
    for (int i = 0; i < services.length; i++) {
      System.out.println(services[i]);
    }   

    try{
      URL url = new URL(download_pdf_from);

      if(saveFile(url, downloaded_filename)) {
        try {
          PDDocument pdf = PDDocument.load(new File(downloaded_filename_open_as_pdf));
          PrinterJob job = PrinterJob.getPrinterJob();
          for (int i = 0; i < services.length; i++) {
           if (services[i].getName().equalsIgnoreCase(printerNameDesired)) {
             docPrintJob = services[i].createPrintJob();
           }
          }

          job.setPrintService(docPrintJob.getPrintService());
          job.setPageable(new PDFPageable(pdf));


          PrintRequestAttributeSet pset = new HashPrintRequestAttributeSet();          
          pset.add(MediaTray.BOTTOM); 
          job.print(pset);

        } catch (Exception e) {
          System.out.println("[FAIL]");
        }      
      } else {
        System.out.println("[FAIL]");
      }      
    } catch (Exception ae) {
      System.out.println("[FAIL]");
    }


  }
}