Barcode条形码的生成

package snippet;

/*
 * Copyright 2004 Jeremias Maerki.
 *
 * 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.
 */

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;

import org.krysalis.barcode4j.impl.code39.Code39Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;

/**
 * This example demonstrates creating a bitmap barcode using the bean API.
 * 
 * @author Jeremias Maerki
 * @version $Id: SampleBitmapBarcodeWithBean.java,v 1.2 2006/11/07 16:45:28 jmaerki Exp $
 */
public class SampleBitmapBarcodeWithBean {

    public static void main(String[] args) {
        try {
            //Create the barcode bean
            Code39Bean bean = new Code39Bean();
            
            final int dpi = 150;
            
            //Configure the barcode generator
            bean.setModuleWidth(UnitConv.in2mm(1.0f / dpi)); //makes the narrow bar 
                                                             //width exactly one pixel
            bean.setWideFactor(3);
            bean.doQuietZone(false);
            
            //Open output file
            File outputFile = new File("out.jpg");
            OutputStream out = new FileOutputStream(outputFile);
            try {
                //Set up the canvas provider for monochrome JPEG output 
                BitmapCanvasProvider canvas = new BitmapCanvasProvider(
                        out, "image/jpeg", dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);
            
                //Generate the barcode
                bean.generateBarcode(canvas, "1234567890");
            
                //Signal end of generation
                canvas.finish();
            } finally {
                out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}