生成商品条形码代码事例

jar包引入：

<!-- 商品条形码-->
<dependency>
   <groupId>net.sf.barcode4j</groupId>
   <artifactId>barcode4j-light</artifactId>
   <version>2.0</version>
</dependency>

工具类：

package com.inborn.inshop.utils;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.commons.lang.StringUtils;
import org.krysalis.barcode4j.impl.code39.Code39Bean;
import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;

/**
 * 条形码工具类
 */
public class BarcodeUtil {
    /**
     * 生成文件
     *
     * @param msg
     * @param path
     * @return
     */
    public static File generateFile(String msg, String path) {
        File file = new File(path);
        try {
            generate(msg, new FileOutputStream(file));
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        }
        return file;
    }
    /**
     * 生成字节
     *
     * @param msg
     * @return
     */
    public static byte[] generate(String msg) {
        ByteArrayOutputStream ous = new ByteArrayOutputStream();
        generate(msg, ous);
        return ous.toByteArray();
    }

    /**
     * 生成到流
     *
     * @param msg
     * @param ous
     */
    public static void generate(String msg, OutputStream ous) {
        if (StringUtils.isEmpty(msg) || ous == null) {
            return;
        }
        Code39Bean bean = new Code39Bean();
        // 精细度
        final int dpi = 150;
        // module宽度
        final double moduleWidth = UnitConv.in2mm(1.0f / dpi);
        // 配置对象
        bean.setModuleWidth(moduleWidth);
        bean.setWideFactor(3);
        bean.doQuietZone(false);
        String format = "image/png";
        try {
            // 输出到流
            BitmapCanvasProvider canvas = new BitmapCanvasProvider(ous, format, dpi,
                    BufferedImage.TYPE_BYTE_BINARY, false, 0);
            // 生成条形码
            bean.generateBarcode(canvas, msg);
            // 结束绘制
            canvas.finish();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

//    public static void main(String[] args) {
//        String msg = "1234567893124124321";
//        String path = "c:/barcode.png";
//        generateFile(msg, path);
//    }
}
Controller类：

/**
 * 入库商品条形码下载
 * @param request
 * @param resp
 * @param depotId
 */
@RequestMapping(value = "/depotCode")
@ResponseBody
public void exportList(HttpServletRequest request,
                       HttpServletResponse resp, Long depotId) throws  IOException {
    // 使用流将数据导出
    OutputStream outStream = resp.getOutputStream();
    try{
        String picName= toUtf8String(DateUtils.dateToString(new Date(),"yyyy-MM-dd")+"入库码"+".png");
        resp.setContentType("application/zip");
        resp.setHeader("Content-Disposition", "attachment; filename="+picName);
        // 禁止图像缓存。
        resp.setHeader("Cache-Control", "no-cache");
        resp.setDateHeader("Expires", 0);
        BarcodeUtil.generate(depotId+"",outStream);
        outStream.flush();
    }catch (Exception e){
        outStream.close();
    }finally {
        outStream.close();
    }
}
public static String toUtf8String(String s){
    StringBuffer sb = new StringBuffer();
    for (int i=0;i<s.length();i++){
        char c = s.charAt(i);
        if (c >= 0 && c <= 255){sb.append(c);}
        else{
            byte[] b;
            try { b = Character.toString(c).getBytes("utf-8");}
            catch (Exception ex) {
                System.out.println(ex);
                b = new byte[0];
            }
            for (int j = 0; j < b.length; j++) {
                int k = b[j];
                if (k < 0) k += 256;
                sb.append("%" + Integer.toHexString(k).toUpperCase());
            }
        }
    }
    return sb.toString();
}

效果：