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POJava: Printing program output to a physical printer
 

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  1. POJava: Printing program output to a physical printer
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    <p>I am a relatively new programmer so this may be a really simple question to answer but its got me a bit stumped.. </p> <p>I'm trying to print my Java GUI's final output to a printer. Now, in my GUI, I have it so that when you hit print, a pop-up comes up with the list of available printers, and based on the one you select, it should print to that printer.</p> <p>However it is not. I got most of my code by scouring the internet for solutions to this problem and found some promising code. However, it printed off of a File. So all I simply do in my method is write my output to a file first so that I can use the same methodology. </p> <p>A couple things before the method: </p> <ol> <li><p>There are no errors or exceptions thrown.</p></li> <li><p>The File I attempt to create every time always exists, and with the correct text.</p></li> <li><p>The printer I am printing to IS receiving the print job, it even thinks it has completed it.</p></li> </ol> <p>If I had to guess, I would think I am perhaps writing the output to File in way that the Printer will not except but isn't telling me. Anyways, there is quite a bit in this code that I don't really have a firm understanding of so please let me know what you can find.</p> <p>Here is my code: </p> <pre><code>private void printToPrinter() { File output = new File("PrintFile.txt"); output.setWritable(true); //Will become the user-selected printer. Object selection = null; try { BufferedWriter out = new BufferedWriter(new FileWriter(output)); out.write(calculationTextArea.getText() + "\n" + specificTextArea.getText()); out.close(); } catch (java.io.IOException e) { System.out.println("Unable to write Output to disk, error occured in saveToFile() Method."); } FileInputStream textStream = null; try { textStream = new FileInputStream("PrintFile.txt"); } catch (java.io.FileNotFoundException e) { System.out.println("Error trying to find the print file created in the printToPrinter() method"); } DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE; Doc mydoc = new SimpleDoc(textStream, flavor, null); //Look up available printers. PrintService[] printers = PrintServiceLookup.lookupPrintServices(flavor, null); if (printers.length == 0) { // No printers found. Inform user. jOptionPane2.showMessageDialog(this, "No printers could be found on your system!", "Error!", JOptionPane.ERROR_MESSAGE); } else { selection = jOptionPane2.showInputDialog(this, "Please select the desired printer:", "Print", JOptionPane.INFORMATION_MESSAGE, null, printers, PrintServiceLookup.lookupDefaultPrintService()); if (selection instanceof PrintService) { PrintService chosenPrinter = (PrintService) selection; DocPrintJob printJob = chosenPrinter.createPrintJob(); try { printJob.print(mydoc, null); } catch (javax.print.PrintException e) { jOptionPane2.showMessageDialog(this, "Unknown error occured while attempting to print.", "Error!", JOptionPane.ERROR_MESSAGE); } } } } </code></pre>
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    1. COAre you sure the printer is not receiving an empty file?
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    2. COdoes the printer print out anything? Even a blank page? Can you print to virtual printer and capture the output? Such as (Microsoft XPS Document Writer)
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    3. COThe printer is not printing out anything, no blank page. When I checked the job info of the "java printing" jobs it was receiving it has this for a job message: "This document does not conform to the Adobe Document Structuring Conventions and may not print correctly!" I am currently trying to work on a way to catch the doc before it goes to the printer to double check it is valid.
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