生成code 128条形码工具类

maven依赖

<dependency> <groupId>net.sf.barcode4j</groupId> <artifactId>barcode4j</artifactId> <version>2.1</version> </dependency>

gradle依赖

compile("net.sf.barcode4j:barcode4j:2.1")

工具代码

package com.tian.demo.admin.controller; import org.apache.commons.lang.ObjectUtils;import org.krysalis.barcode4j.HumanReadablePlacement;import org.krysalis.barcode4j.impl.code128.Code128Bean;import org.krysalis.barcode4j.output.bitmap.BitmapCanvasProvider; import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.IOException; /*** @ClassName BarCodeUtils* @Description TODO* @Author Harry* @Date 2020/5/130:35* @Version 1.0**/public class BarCodeUtils { /** * 生成code128条形码 * * @param height 条形码的高度 * @param width 条形码的宽度 * @param message 要生成的文本 * @param withQuietZone 是否两边留白 * @param hideText 隐藏可读文本 * @return 图片对应的字节码 */ public static byte[] generateBarCode128(String message, Double height, Double width, boolean withQuietZone, boolean hideText) { Code128Bean bean = new Code128Bean(); // 分辨率 int dpi = 512; // 设置两侧是否留白 bean.doQuietZone(withQuietZone); // 设置条形码高度和宽度 bean.setBarHeight((double) ObjectUtils.defaultIfNull(height, 9.0D)); if (width != null) { bean.setModuleWidth(width); } // 设置文本位置（包括是否显示） if (hideText) { bean.setMsgPosition(HumanReadablePlacement.HRP_NONE); } // 设置图片类型 String format = "image/png"; ByteArrayOutputStream ous = new ByteArrayOutputStream(); BitmapCanvasProvider canvas = new BitmapCanvasProvider(ous, format, dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0); // 生产条形码 bean.generateBarcode(canvas, message); try { canvas.finish(); } catch (IOException e) { } return ous.toByteArray(); }}

控制层调用

@GetMapping("test") public void test(HttpServletRequest request,HttpServletResponse response) throws IOException { String parameter = request.getParameter(""); byte[] bytes = BarCodeUtils.generateBarCode128("4305383450594", 10.00, 0.3, true, false); response.setContentType("image/png"); OutputStream output = response.getOutputStream(); InputStream in = new ByteArrayInputStream(bytes); int len; byte[] buf = new byte[1024]; while ((len = in.read(buf)) != -1) { output.write(buf, 0, len); } output.flush(); //如果没有下面两行，可能出现getOutputStream() has already been called for this response的异常// output.clear();// out = pageContext.pushBody(); // Result result = new Result(); }

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