<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>barcode</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> </head> <body> <table border="1"> <tr> <td> <h1> code39 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=0123456789&type=code39" height="100px" width=300px /> </td> <td> <h1> code128 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=0123456789&type=code128" height="100px" width=300px /> </td> <td> <h1> Codabar </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=0123456789&type=codabar" height="100px" width=300px /> </td> </tr> <tr> <td> <h1> intl2of5 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=01234567890540&type=intl2of5" height="100px" width=300px /> </td> <td> <h1> upc-a </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=012345678912&type=upc-a" height="100px" width=300px /> </td> <td> <h1> ean-13 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=200123457893&type=ean-13" height="100px" width=300px /> </td> <td> <h1> ean-8 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=20123451&type=ean-8" height="100px" width=300px /> </td> </tr> <tr> <td> <h1> postnet </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=01234567890540&type=postnet" height="100px" width=300px /> </td> <td> <h1> royal-mail-cbc </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=012345AS678912&type=royal-mail-cbc" height="100px" width=300px /> </td> <td> <h1> pdf417 </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=200123457893&type=pdf417" height="100px" width=300px /> </td> <td> <h1> datamatrix </h1> <img src="<%=request.getContextPath()%>/barcodeServlet?msg=20123451&type=datamatrix" height="100px" width=300px /> </td> </tr> </table> </body> </html>
BarcodeServlet.java的代码如下：
/*
* 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 org.krysalis.barcode4j.servlet;
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 1.6 2007/01/19 12:26:55 jmaerki Exp $
*/
public class BarcodeServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/** 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 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 = "6935840910605";
//6901687230107
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);
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
*/
protected Configuration buildCfg(HttpServletRequest request) {
DefaultConfiguration cfg = new DefaultConfiguration("barcode");
//Get type
String type = request.getParameter(BARCODE_TYPE);
if (type == null) type = "code128";
DefaultConfiguration child = new DefaultConfiguration(type);
cfg.addChild(child);
//Get additional attributes
DefaultConfiguration attr;
String height = request.getParameter(BARCODE_HEIGHT);
if (height != null) {
attr = new DefaultConfiguration("height");
attr.setValue(height);
child.addChild(attr);
}
String moduleWidth = request.getParameter(BARCODE_MODULE_WIDTH);
if (moduleWidth != null) {
attr = new DefaultConfiguration("module-width");
attr.setValue(moduleWidth);
child.addChild(attr);
}
String wideFactor = request.getParameter(BARCODE_WIDE_FACTOR);
if (wideFactor != null) {
attr = new DefaultConfiguration("wide-factor");
attr.setValue(wideFactor);
child.addChild(attr);
}
String quietZone = request.getParameter(BARCODE_QUIET_ZONE);
if (quietZone != null) {
attr = new DefaultConfiguration("quiet-zone");
if (quietZone.startsWith("disable")) {
attr.setAttribute("enabled", "false");
} else {
attr.setValue(quietZone);
}
child.addChild(attr);
}
// creating human readable configuration according to the new Barcode Element Mappings
// where the human-readable has children for font name, font size, placement and
// custom pattern.
String humanReadablePosition = request.getParameter(BARCODE_HUMAN_READABLE_POS);
String pattern = request.getParameter(BARCODE_HUMAN_READABLE_PATTERN);
String humanReadableSize = request.getParameter(BARCODE_HUMAN_READABLE_SIZE);
String humanReadableFont = request.getParameter(BARCODE_HUMAN_READABLE_FONT);
if (!((humanReadablePosition == null)
&& (pattern == null)
&& (humanReadableSize == null)
&& (humanReadableFont == null))) {
attr = new DefaultConfiguration("human-readable");
DefaultConfiguration subAttr;
if (pattern != null) {
subAttr = new DefaultConfiguration("pattern");
subAttr.setValue(pattern);
attr.addChild(subAttr);
}
if (humanReadableSize != null) {
subAttr = new DefaultConfiguration("font-size");
subAttr.setValue(humanReadableSize);
attr.addChild(subAttr);
}
if (humanReadableFont != null) {
subAttr = new DefaultConfiguration("font-name");
subAttr.setValue(humanReadableFont);
attr.addChild(subAttr);
}
if (humanReadablePosition != null) {
subAttr = new DefaultConfiguration("placement");
subAttr.setValue(humanReadablePosition);
attr.addChild(subAttr);
}
child.addChild(attr);
}
return cfg;
}
}
web.xml配置如下：
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>barcodeServlet</servlet-name> <servlet-class>org.krysalis.barcode4j.servlet.BarcodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>barcodeServlet</servlet-name> <url-pattern>/barcodeServlet</url-pattern> </servlet-mapping> </web-app>
需要导入的包有：
avalon-framework-4.2.0.jar barcode4j.jar
当在地址栏中输入：http://localhost:8080/barCode后按下enter后
显示的结果为：
[img]
[/img]