我将如何从Java程序打印文本?(Java) [英] How would I go about printing text from a java program? (Java)

问题描述

我什至不知道这是否可行，我对此表示高度怀疑，但是如果可以的话，请您告诉我如何?我只想知道如何从打印机打印一些文本.

I don't even know if this is possible and I highly doubt it is, but if you can, can you please tell me how? I just want to know how to print some text from a printer.

有什么想法吗?

推荐答案

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

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.print.event.PrintJobAdapter;
import javax.print.event.PrintJobEvent;

public class PrintText {

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

    String defaultPrinter = 
      PrintServiceLookup.lookupDefaultPrintService().getName();
    System.out.println("Default printer: " + defaultPrinter);
    PrintService service = PrintServiceLookup.lookupDefaultPrintService();

    // prints the famous hello world! plus a form feed
    InputStream is = new ByteArrayInputStream("hello world!\f".getBytes("UTF8"));

    PrintRequestAttributeSet  pras = new HashPrintRequestAttributeSet();
    pras.add(new Copies(1));

    DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
    Doc doc = new SimpleDoc(is, flavor, null);
    DocPrintJob job = service.createPrintJob();

    PrintJobWatcher pjw = new PrintJobWatcher(job);
    job.print(doc, pras);
    pjw.waitForDone();
    is.close();
  }
}

class PrintJobWatcher {
  boolean done = false;

  PrintJobWatcher(DocPrintJob job) {
    job.addPrintJobListener(new PrintJobAdapter() {
      public void printJobCanceled(PrintJobEvent pje) {
        allDone();
      }
      public void printJobCompleted(PrintJobEvent pje) {
        allDone();
      }
      public void printJobFailed(PrintJobEvent pje) {
        allDone();
      }
      public void printJobNoMoreEvents(PrintJobEvent pje) {
        allDone();
      }
      void allDone() {
        synchronized (PrintJobWatcher.this) {
          done = true;
          System.out.println("Printing done ...");
          PrintJobWatcher.this.notify();
        }
      }
    });
  }
  public synchronized void waitForDone() {
    try {
      while (!done) {
        wait();
      }
    } catch (InterruptedException e) {
    }
  }
}

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