抛弃Adobe Reader——用ICEpdf来打开你的PDF

还记得前面我们说过普通打印机是无法解释PDF文档的，所以需要通过别的方式，比如通过渲染成图片再打印出来

ICEpdf使用的就是这种先将PDF渲染成图片的方式来打印PDF文档的，具体的操作细节已经封装好了，我们需要做的就是学习example来满足我们的需求：

	/**
	 * Attempts to Print PDF documents which are specified as application
	 * arguments.
	 * 
	 * @param args
	 *            list of files which should be printed by the application
	 */
	public static void main(String[] args) {

		// setup for input from command line
		BufferedReader stdin = new BufferedReader(new InputStreamReader(
				System.in));
		/**
		 * Find Available printers
		 */
		PrintService[] services = PrintServiceLookup.lookupPrintServices(
				DocFlavor.SERVICE_FORMATTED.PAGEABLE, null);

		// MultiDocPrintService mdps[] = PrintServiceLookup
		// .lookupMultiDocPrintServices(null, null);
		// MultiDocPrintService mdps[] = PrintServiceLookup
		// .lookupMultiDocPrintServices(
		// new DocFlavor[] { DocFlavor.SERVICE_FORMATTED.PAGEABLE },
		// null);

		// MultiDocPrintJob mdpj = mdps[0].createMultiDocPrintJob();
		// System.out.println(mdpj);

		int selectedPrinter = 0;
		// ask the user which printer they want, only quite when they type
		// q, otherwise just keep asking them which printer to use.
		while (!(selectedPrinter > 0 && selectedPrinter <= services.length)) {
			System.out
					.println("Please select the printer number your wish to print to (q to quit):");
			int printerIndex = 1;
			for (int i = 0, max = services.length - 1; i <= max; i++) {
				System.out.println("  " + printerIndex++ + ". "
						+ services[i].getName());
			}
			System.out.print("Printer selection? ");
			String input = "";
			// get users choice
			try {
				input = stdin.readLine();
			} catch (IOException e) {
				// purposely left empty;
			}

			if (input.length() == 0) {
				System.out.println("Please select a valid printer number.");
				System.out.println();
			} else if (input.toLowerCase().equals("q")) {
				System.exit(0);
			} else {
				try {
					selectedPrinter = Integer.parseInt(input);
					if ((selectedPrinter > 0 && selectedPrinter <= services.length)) {
						break;
					}
				} catch (NumberFormatException e) {
					// ignore error.
				}
				System.out.println("Please select a valid printer number.");
				System.out.println();
			}
		}

		/**
		 * Selected Printer, via user input
		 */
		PrintService selectedService = services[selectedPrinter - 1];

		/**
		 * Show selected Printer default attributes.
		 */
		System.out.println("Supported Job Properties for printer: "
				+ selectedService.getName());
		Class[] supportedAttributes = selectedService
				.getSupportedAttributeCategories();
		for (Class supportedAttribute : supportedAttributes) {
			System.out.println("   "
					+ supportedAttribute.getName()
					+ ":= "
					+ selectedService
							.getDefaultAttributeValue(supportedAttribute));
		}

		// Open the document, create a PrintHelper and finally print the
		// document
		Document pdf = new Document();

		try {
			// load the file specified by the command line
			String filePath;
			if (args.length > 0) {
				filePath = args[0];
			} else {
				throw new FileNotFoundException("Specify a PDF document.");
			}
			pdf.setFile(filePath);

			// create a new print helper with a specified paper size and print
			// quality
			PrintHelper printHelper = new PrintHelper(null, pdf.getPageTree(),
					0f, MediaSizeName.NA_LEGAL, PrintQuality.DRAFT);
			// try and print pages 1 - 10, 1 copy, scale to fit paper.
			printHelper.setupPrintService(selectedService, 0, 0, 1, true);
			// print the document
			printHelper.print();

		} catch (FileNotFoundException e) {
			logger.log(Level.WARNING, "PDF file not found.", e);
		} finally {
			pdf.dispose();
		}
	}

		MultiDocPrintService mdps[] = PrintServiceLookup
				.lookupMultiDocPrintServices(null, null);
		MultiDocPrintService mdps[] = PrintServiceLookup
				.lookupMultiDocPrintServices(
						new DocFlavor[] { DocFlavor.SERVICE_FORMATTED.PAGEABLE },
						null);

		MultiDocPrintJob mdpj = mdps[0].createMultiDocPrintJob();
		System.out.println(mdpj);

我猜想这类打印机应该就是那种可以直接支持打印PDF的打印机吧，这里我们将这些代码注释掉就可以使用了。

打印过程主要是通过PrintHelper这个类来封装的，最后具体实现还是使用Java Print Service来完成的。所以我们可以指定docAttributes和printAttributes，这两个属性是Java打印服务的内容，具体可以参考这里

			PrintHelper printHelper = new PrintHelper(null, pdf.getPageTree(),
					0f, MediaSizeName.NA_LEGAL, PrintQuality.DRAFT);