java 条形码生成类

来源：互联网发布：深圳蜂窝网络怎么样编辑：程序博客网时间：2024/06/10 17:03

正在开发的一个j2ee的项目项目中需要使用到生成条形码这里用了Barcode4J作为条形码生成，官网地址是http://barcode4j.sourceforge.net/ 里面有很详细的介绍。本人只是项目使用。所以就不介绍了。

首先下载barcode4j-2.0-bin.zip和barcode4j-2.0-src.zip 由于里面提供的例子是用servlet使用的。而我项目是用的是struts，所以更改了下源代码换成action。

以下代码中。createBarcode()方法是最主要的action方法，提供给用户调用。

一下就是一个生成条形码的action类。

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.servlet.ServletException;
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;

importorg.apache.avalon.framework.configuration.Configuration;
importorg.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;
importorg.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;

public class BarcodeAction extends BaseAction {

private static final long serialVersionUID =-134361457426852420L;

    publicstatic final StringBARCODE_MSG                = "msg";

    publicstatic final StringBARCODE_TYPE               = "type";


    publicstatic final StringBARCODE_HEIGHT             = "height";

    publicstatic final StringBARCODE_MODULE_WIDTH       = "mw";

    publicstatic final StringBARCODE_WIDE_FACTOR        = "wf";

    publicstatic final StringBARCODE_QUIET_ZONE         = "qz";

    publicstatic final String BARCODE_HUMAN_READABLE_POS ="hrp";

    publicstatic final StringBARCODE_FORMAT             = "fmt";

    publicstatic final StringBARCODE_IMAGE_RESOLUTION   = "res";

    publicstatic final StringBARCODE_IMAGE_GRAYSCALE    = "gray";

    publicstatic final String BARCODE_HUMAN_READABLE_SIZE = "hrsize";

    publicstatic final String BARCODE_HUMAN_READABLE_FONT = "hrfont";

    publicstatic final String BARCODE_HUMAN_READABLE_PATTERN ="hrpattern";
    privatetransient Logger log = newConsoleLogger(ConsoleLogger.LEVEL_INFO);




   public   String createBarcode() throwsServletException{

       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 = newjavax.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);
       }
  return null;
    }

    protectedString determineFormat(HttpServletRequest request) {
       String format = request.getParameter(BARCODE_FORMAT);
       format = MimeTypes.expandFormat(format);
       if (format == null) format = MimeTypes.MIME_JPEG;
       return format;
    }

    protectedConfiguration buildCfg(HttpServletRequest request) {
       DefaultConfiguration cfg = newDefaultConfiguration("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);
       }

       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;
}

}

以上很多参数的设置，我自己也不是很了解。如果需要的话。可以官网详细了解。

调用方式，直接在页面定义一张图片，而条形码的内容可以自定义传入，也可以动态传入
如果是自定义传入，图片中msg=22222就是生成的内容 type就是生成的规格（code39,Codabar等）