Question

我应该做一个简单的任务：用Java打印文本文件，但是虽然代码执行没有错误，但实际上没有任何内容来自打印机。我检查了打印队列并且它们已经空了。我在Windows 10上使用Java 8.

我已经尝试了很多代码来让事情顺利进行，但这就是我最终的结果。这可能都是本地问题，但也许有人可以在我的代码中发现错误或可疑的东西。

package net.snortum.play;

import java.io.FileInputStream;
import java.io.FileNotFoundException;

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.ServiceUI;
import javax.print.SimpleDoc;
import javax.print.attribute.DocAttributeSet;
import javax.print.attribute.HashDocAttributeSet;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.MediaSizeName;

public class PrinterPlay {

    public static void main(String[] args) {
        new PrinterPlay().run();
    }

    private void run() {
        String filename = "src/net/snortum/play/PrinterPlay.java";
        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
        PrintService printService[] = PrintServiceLookup
                .lookupPrintServices(flavor, pras);

        if (printService == null || printService.length == 0) {
            System.out.println("No printer could be found");
            return;
        }

        try {
            PrintService defaultService = PrintServiceLookup
                    .lookupDefaultPrintService();
            PrintService service = ServiceUI.printDialog(null, 200, 200,
                    printService, defaultService, flavor, pras);

            if (service == null) {
                System.out.println("Printing canceled");
                return;
            }

            System.out.println(service.getName());
            DocPrintJob job = service.createPrintJob();
            FileInputStream fis = new FileInputStream(filename);
            DocAttributeSet das = new HashDocAttributeSet();
            das.add(MediaSizeName.NA_LETTER);
            Doc doc = new SimpleDoc(fis, flavor, das);
            job.print(doc, pras);
            System.out.println("Print job sent without exception");

        } catch (PrintException pe) {
            System.out.println("Problem printing");
            pe.printStackTrace();

        } catch (FileNotFoundException fnfe) {
            System.out.println("Can't find file");
            fnfe.printStackTrace();
        }
    }
}

我尝试了什么以及发生了什么：

几种不同的文档和打印机：无需打印即可执行
从其他程序（如Notepad ++）打印文档：打印
更改DocFlavor：除AUTOSENSE以外的任何内容，我都没有获得任何打印机服务
向PrintRequestAttributeSet添加属性：no Printer Services
向DocAttributeSet添加属性：执行而不打印

Java - 代码执行无异常但不打印任何打印作业

0 个答案: