java - 使用java打印条形码

Question

我正在尝试使用 servlet 打印条形码，但打印尺寸不正确。我想打印具有特定宽度和高度的标签。如果我使用第 3 方应用程序打印此条形码，它打印正确，但如果我使用我的代码，打印尺寸会变成两倍，使用多个标签。

package com.service;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.krysalis.barcode4j.impl.int2of5.Interleaved2Of5Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;

/**
 *
 * @author akash
 */
public class Barcode extends HttpServlet {
    private String filePath = "/home/chimeralabs/public_html/uploads/";
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");

            String id = request.getParameter("patientId");

           Interleaved2Of5Bean bean = new Interleaved2Of5Bean();

    bean.setHeight(10d);

    bean.doQuietZone(false);

    OutputStream out = new java.io.FileOutputStream(new File("Barcode_"+id+".png"));

    BitmapCanvasProvider provider =
        new BitmapCanvasProvider(out, "image/x-png", 510,
                                 BufferedImage.TYPE_BYTE_GRAY, false,
                                 0);
    bean.generateBarcode(provider, id);

    provider.finish();

    BufferedImage barcodeImage = provider.getBufferedImage();
    response.setContentType("image/x-png");
    OutputStream outputStream = response.getOutputStream();
    ImageIO.write(barcodeImage, "png", outputStream);
    outputStream.close();
    request.setAttribute("patientId", id);
    RequestDispatcher rd = request.getRequestDispatcher("Print");
    rd.forward(request, response);
    }

}

import java.io.FileInputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Print extends HttpServlet {
    private String filePath = "/home/chimeralabs/public_html/uploads/";

   @Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
    pras.add(new Copies(1));

    String id = (String)request.getAttribute("patientId");

    PrintService pss[] = PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.GIF, pras);

    PrintService ps = pss[0];
    System.out.println("Printing to " + ps);

    DocPrintJob job = ps.createPrintJob();

    FileInputStream fin = new FileInputStream("Barcode_1082.png");
    Doc doc = new SimpleDoc(fin, DocFlavor.INPUT_STREAM.GIF, null);

       try {
           job.print(doc, pras);
       } catch (PrintException ex) {
           Logger.getLogger(Print.class.getName()).log(Level.SEVERE, null, ex);
       }

    fin.close();
  }
}

Answer 1

(由于我还不能发表评论，我想我必须将此作为答案？)

我对 Java 打印不太熟悉，但看起来您尝试打印的文件是 PNG，但 DocFlavor 设置为 GIF。好像有一个PNG DocFlavor。你尝试过吗？

此外，您可能想查看 this question这看起来很相似。