Java实现条形码打印

/* * Copyright 2002-2007 Jeremias Maerki or contributors to Barcode4J, as applicable * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.whizen.label; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.xml.transform.Result; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import org.apache.avalon.framework.configuration.Configuration; import org.apache.avalon.framework.configuration.DefaultConfiguration; import org.apache.avalon.framework.logger.ConsoleLogger; import org.apache.avalon.framework.logger.Logger; import org.krysalis.barcode4j.BarcodeGenerator; import org.krysalis.barcode4j.BarcodeUtil; import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider; import org.krysalis.barcode4j.output.eps.EPSCanvasProvider; import org.krysalis.barcode4j.output.svg.SVGCanvasProvider; import org.krysalis.barcode4j.tools.MimeTypes; /** * Simple barcode servlet. * * @version $Id: BarcodeServlet.java,v 1.7 2008/03/04 20:07:23 jmaerki Exp $ */ public class BarcodeServlet extends HttpServlet { /** Parameter name for the message */ public static final String BARCODE_MSG = "msg"; /** Parameter name for the barcode type */ public static final String BARCODE_TYPE = "type"; /** Parameter name for the barcode height */ public static final String BARCODE_HEIGHT = "height"; /** Parameter name for the module width */ public static final String BARCODE_MODULE_WIDTH = "mw"; /** Parameter name for the wide factor */ public static final String BARCODE_WIDE_FACTOR = "wf"; /** Parameter name for the quiet zone */ public static final String BARCODE_QUIET_ZONE = "qz"; /** Parameter name for the human-readable placement */ public static final String BARCODE_HUMAN_READABLE_POS = "hrp"; /** Parameter name for the output format */ public static final String BARCODE_FORMAT = "fmt"; /** Parameter name for the image resolution (for bitmaps) */ public static final String BARCODE_IMAGE_RESOLUTION = "res"; /** Parameter name for the grayscale or b/w image (for bitmaps) */ public static final String BARCODE_IMAGE_GRAYSCALE = "gray"; /** Parameter name for the font size of the human readable display */ public static final String BARCODE_HUMAN_READABLE_SIZE = "hrsize"; /** Parameter name for the font name of the human readable display */ public static final String BARCODE_HUMAN_READABLE_FONT = "hrfont"; /** Parameter name for the pattern to format the human readable message */ public static final String BARCODE_HUMAN_READABLE_PATTERN = "hrpattern"; private transient Logger log = new ConsoleLogger(ConsoleLogger.LEVEL_INFO); /** * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest, HttpServletResponse) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { String format = determineFormat(request); int orientation = 0; Configuration cfg = buildCfg(request); String msg = request.getParameter(BARCODE_MSG); if (msg == null) msg = "0123456789"; BarcodeUtil util = BarcodeUtil.getInstance(); BarcodeGenerator gen = util.createBarcodeGenerator(cfg); ByteArrayOutputStream bout = new ByteArrayOutputStream(4096); try { if (format.equals(MimeTypes.MIME_SVG)) { //Create Barcode and render it to SVG SVGCanvasProvider svg = new SVGCanvasProvider(false, orientation); gen.generateBarcode(svg, msg); org.w3c.dom.DocumentFragment frag = svg.getDOMFragment(); //Serialize SVG barcode TransformerFactory factory = TransformerFactory.newInstance(); Transformer trans = factory.newTransformer(); Source src = new javax.xml.transform.dom.DOMSource(frag); Result res = new javax.xml.transform.stream.StreamResult(bout); trans.transform(src, res); } else if (format.equals(MimeTypes.MIME_EPS)) { EPSCanvasProvider eps = new EPSCanvasProvider(bout, orientation); gen.generateBarcode(eps, msg); eps.finish(); } else { String resText = request.getParameter(BARCODE_IMAGE_RESOLUTION); int resolution = 300; //dpi if (resText != null) { resolution = Integer.parseInt(resText); } if (resolution > 2400) { throw new IllegalArgumentException( "Resolutions above 2400dpi are not allowed"); } if (resolution < 10) { throw new IllegalArgumentException( "Minimum resolution must be 10dpi"); } String gray = request.getParameter(BARCODE_IMAGE_GRAYSCALE); BitmapCanvasProvider bitmap = ("true".equalsIgnoreCase(gray) ? new BitmapCanvasProvider( bout, format, resolution, BufferedImage.TYPE_BYTE_GRAY, true, orientation) : new BitmapCanvasProvider( bout, format, resolution, BufferedImage.TYPE_BYTE_BINARY, false, orientation)); gen.generateBarcode(bitmap, msg); bitmap.finish(); } } finally { bout.close(); } response.setContentType(format); response.setContentLength(bout.size()); response.getOutputStream().write(bout.toByteArray()); response.getOutputStream().flush(); } catch (Exception e) { log.error("Error while generating barcode", e); throw new ServletException(e); } catch (Throwable t) { log.error("Error while generating barcode", t); throw new ServletException(t); } } /** * Check the request for the desired output format. * @param request the request to use * @return MIME type of the desired output format. */ protected String determineFormat(HttpServletRequest request) { String format = request.getParameter(BARCODE_FORMAT); format = MimeTypes.expandFormat(format); //change_image_type if (format == null) format = MimeTypes.MIME_JPEG; return format; } /** * Build an Avalon Configuration object from the request. * @param request the request to use * @return the newly built COnfiguration object * @todo Change to bean API