jar包引入：

     
        
     
      net.sf.barcode4j
         
     
      barcode4j-light
         
     
      2.0
      
     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
    
     = 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：