java生成矢量条形码二维码

产品说条形码模糊，然后就生成了矢量的条形码给前端用。后面才知道前端是可以自己直接生成的。
还是记录一下
遇到一个奇怪的问题，在demo工程里面请求返回的流页面能直接显示出图形。但是在项目工程里面却返回的是xml形式的字符串。这里搞了一阵。后面无意间发现。直接返回String形式的svg文件内容，前端居然可以显示。然后后台直接返回了Sting形式给前端直接用。样式也是调好的。加了width="100%‘’方便前端控制宽度。之前直接返回流前端用不了。

参考代码

    <dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>2.2</version></dependency><dependency><groupId>de.erichseifert.vectorgraphics2d</groupId><artifactId>VectorGraphics2D</artifactId><version>0.9.3</version></dependency><dependency><groupId>net.sf.barcode4j</groupId><artifactId>barcode4j</artifactId><version>2.1</version></dependency>@RequestMapping("/bar")@ResponseBodypublic String getbar(HttpServletResponse response,String code) {String res = null;try {res = BarcodeTestTools.getcode3(response,code);log.info("返回的结果={}",res);res = res.replace("<svg","<svg width=\"100%\"");} catch (Exception e) {System.out.println(e);}System.out.println("返回结果==="+res);return res;}public static String getcode3(HttpServletResponse response,String code) throws BarcodeCanvasSetupException, TransformerException, IOException {ServletOutputStream out = response.getOutputStream();response.reset();Double moduleWidth = Double.valueOf(1.0D);double dpi = 150;Double width = 5d;Code128Bean bean = new Code128Bean();String barcode = code;Integer barcodeLength = Integer.valueOf(barcode.length());if (barcodeLength.intValue() < 8){moduleWidth = Double.valueOf(2.0D * width.doubleValue());}else if (barcodeLength.intValue() < 16){moduleWidth = width;}if (moduleWidth.doubleValue() < 1.0D){moduleWidth = Double.valueOf(1.0D);}bean.setModuleWidth(UnitConv.in2mm(moduleWidth.doubleValue() / dpi));
//        bean.setModuleWidth(80);
//        bean.setHeight(60);bean.setBarHeight(30);// 高度
//        bean.setQuietZone(10); // 向右偏移bean.setMsgPosition(HumanReadablePlacement.HRP_NONE);// 设置两侧是否加空白bean.doQuietZone(false);SVGCanvasProvider canvas = new SVGCanvasProvider(true, 0);bean.generateBarcode(canvas, barcode);DocumentFragment frag = canvas.getDOMFragment();TransformerFactory factory = TransformerFactory.newInstance();Transformer trans = factory.newTransformer();Source src = new DOMSource(frag);File tempFile = File.createTempFile("bar",".svg");Result res = new StreamResult(tempFile);// 入参file则写到文件里面； 这里没必要这么搞，直接StringWriter写过去就可以，参考下面更新部分         response.getOutputStream()就直接写到返回流里面trans.transform(src, res);FileReader fileReader = new FileReader(tempFile);BufferedReader bufferedReader = new BufferedReader(fileReader);StringBuilder sb = new StringBuilder();String line =bufferedReader.readLine();while (line!=null){System.out.println(line);sb.append(line);line = bufferedReader.readLine();}bufferedReader.close();fileReader.close();tempFile.delete();return sb.toString();}

二维码

  @RequestMapping("/qr")@ResponseBodypublic String jxxqr(HttpServletResponse response,String code,int size) throws IOException, WriterException {String res = Test.getQr(response,code,size);System.out.println("qr====="+res);return res;}public static String getQr(HttpServletResponse response,String code,int size) throws WriterException, IOException {double point_x = 0;double point_y = 0;final int blockSize = 1;SVGGraphics2D funcOld = new SVGGraphics2D(point_x, point_y, 40 * blockSize, 40 * blockSize);ExportQrCode.fill2VectorLine(funcOld,GetBitMatrix(code, size,ErrorCorrectionLevel.M), blockSize);File tempFile = File.createTempFile("bar",".svg");PrintStream psFile = new PrintStream(tempFile);psFile.append(funcOld.toString());psFile.close();FileReader fileReader = new FileReader(tempFile);BufferedReader bufferedReader = new BufferedReader(fileReader);StringBuilder sb = new StringBuilder();String line =bufferedReader.readLine();while (line!=null){sb.append(line);line = bufferedReader.readLine();}bufferedReader.close();fileReader.close();tempFile.delete();return sb.toString();}页面
<!DOCTYPE html>
<html lang="en">
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head><meta charset="utf-8"><meta name="description" content="particles.js is a lightweight JavaScript library for creating particles."><meta name="author" content="Vincent Garreau" /><meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"><title>testsvg</title>
</head><style type="text/css">.svg-container {display: inline-block;position: relative;width: 100%;padding-bottom: 100%;vertical-align: middle;overflow: hidden;}
</style>
<body><div style="width: 100%;background-color: gray;height: 90px;"></div><div style="width: 100%;height: 120px;"><div style="margin-left:10px;float: left;width: 45%;height:100px;background-color: #00FF00"><div class="svg-container" id="showbox"></div></div><div style="float: left;width: 45%;height:100px; background-color:green;margin-left: 5px; "><div class="svg-container" id="showbox2" style="margin-top: -20px;"></div></div>
</div><div style="height: 400px;width:100%;float: left;" data-test="写死的二维码"><svg version="1.2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0mm" y="0mm" width="40mm" height="40mm" viewBox="0 0 40 40"><style type="text/css"><![CDATA[text { font:12px Dialog; }]]></style><rect x="9" y="9" width="1" height="7" style="fill:rgb(0,0,0);stroke:none" /><rect x="9" y="17" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="9" y="21" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="9" y="23" width="1" height="7" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="9" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="15" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="19" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="21" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="23" width="1" height="1" 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style="fill:rgb(0,0,0);stroke:none" /><rect x="28" y="18" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="28" y="20" width="1" height="2" style="fill:rgb(0,0,0);stroke:none" /><rect x="28" y="24" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="28" y="28" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="29" y="9" width="1" height="7" style="fill:rgb(0,0,0);stroke:none" /><rect x="29" y="18" width="1" height="3" style="fill:rgb(0,0,0);stroke:none" /><rect x="29" y="23" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /></svg>
</div>
<!-- scripts -->
<script th:src="@{/js/particles.js}"></script>
<script th:src="@{/js/app.js}"></script>
<script th:src="@{/js/jquery-3.4.1.min.js}"></script>
<script th:src="@{/js/layui/layui.js}"></script>
<script>$(function(){var ctxPath  = [[@{/}]];var ctxPath=[[${#httpServletRequest.getContextPath()}]]/;$.get(ctxPath +"/ban/qr?code=123456&size=40", function(result2){console.log(result2);$("#showbox2").html(result2);});$.get(ctxPath +"/ban/bar3?code=123456789", function(result){console.log(result);$("#showbox").html(result);});});</script>
</body>
</html>

2021-07-16 14:21:17 更新
优惠券换新版了，用矢量二维码和条形码。把之前的代码整理了一下。矢量的优点是随意放大不失真。这就很棒了！

实验发现，使用上面生成的二维码会出现白线，类似打印机坏了，一个像素没打印一样。

类似这种谷歌找了一下，换了种方式后没有这个问题了记录一下生成的二维码很干净

另外值得注意的是 response.getOutputStream()不需要手动关闭。在servlet运行完毕时自动flush和close

 package com.mb.sleep.sleep.utils;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitArray;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.krysalis.barcode4j.HumanReadablePlacement;
import org.krysalis.barcode4j.impl.code128.Code128Bean;
import org.krysalis.barcode4j.output.BarcodeCanvasSetupException;
import org.krysalis.barcode4j.output.svg.SVGCanvasProvider;
import org.krysalis.barcode4j.tools.UnitConv;
import org.w3c.dom.DocumentFragment;import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;public class BarQrCodeService {/*** 条形码** @param code* @return* @throws BarcodeCanvasSetupException* @throws TransformerException* @throws IOException*/public static String getBarCodeSVGStr(String code) throws Exception {Double moduleWidth = Double.valueOf(1.0D);//分辨率double dpi = 300;Double width = 6d;Code128Bean bean = new Code128Bean();String barcode = code;Integer barcodeLength = Integer.valueOf(barcode.length());if (barcodeLength.intValue() < 8) {moduleWidth = Double.valueOf(2.0D * width.doubleValue());} else if (barcodeLength.intValue() < 16) {moduleWidth = width;}if (moduleWidth.doubleValue() < 1.0D) {moduleWidth = Double.valueOf(1.0D);}bean.setModuleWidth(UnitConv.in2mm(moduleWidth.doubleValue() / dpi));bean.setBarHeight(30);// 高度bean.setQuietZone(60); // 向右偏移bean.setMsgPosition(HumanReadablePlacement.HRP_NONE);// 设置两侧是否加空白bean.doQuietZone(false);SVGCanvasProvider canvas = new SVGCanvasProvider(true, 0);bean.generateBarcode(canvas, barcode);DocumentFragment frag = canvas.getDOMFragment();TransformerFactory factory = TransformerFactory.newInstance();Transformer trans = factory.newTransformer();Source src = new DOMSource(frag);StringWriter outw = new StringWriter();trans.transform(src, new StreamResult(outw));return outw.toString();}/*** 条形码写流* @param response* @param code* @throws BarcodeCanvasSetupException* @throws TransformerException* @throws IOException*/public static void getBarCodeSVGStrOut(HttpServletResponse response, String code) throws Exception {Double moduleWidth = Double.valueOf(1.0D);//分辨率double dpi = 300;Double width = 6d;Code128Bean bean = new Code128Bean();String barcode = code;Integer barcodeLength = Integer.valueOf(barcode.length());if (barcodeLength.intValue() < 8) {moduleWidth = Double.valueOf(2.0D * width.doubleValue());} else if (barcodeLength.intValue() < 16) {moduleWidth = width;}if (moduleWidth.doubleValue() < 1.0D) {moduleWidth = Double.valueOf(1.0D);}bean.setModuleWidth(UnitConv.in2mm(moduleWidth.doubleValue() / dpi));bean.setBarHeight(30);// 高度bean.setQuietZone(60); // 向右偏移bean.setMsgPosition(HumanReadablePlacement.HRP_NONE);// 设置两侧是否加空白bean.doQuietZone(false);SVGCanvasProvider canvas = new SVGCanvasProvider(true, 0);bean.generateBarcode(canvas, barcode);DocumentFragment frag = canvas.getDOMFragment();TransformerFactory factory = TransformerFactory.newInstance();Transformer trans = factory.newTransformer();Source src = new DOMSource(frag);trans.transform(src, new StreamResult(response.getOutputStream()));}/*** 二维码** @param code* @param size* @return* @throws WriterException* @throws IOException*/public static String getqrSVGStr(String code, int size) throws Exception {return createQRStr(code,size);}/*** 二维码 写流** @param response* @param code* @param size* @return* @throws WriterException* @throws IOException*/public static void getqrSVGStrOut(HttpServletResponse response, String code, int size) throws Exception {response.getOutputStream().write(createQRStr(code,size).getBytes(StandardCharsets.UTF_8));}/*** 生成svg字符串* @param code* @param size* @return* @throws Exception*/private static String createQRStr(String code, int size) throws Exception {QRCodeWriter qrCodeWriter = new QRCodeWriter();Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.UTF_8.name());BitMatrix bitMatrix = qrCodeWriter.encode(code, BarcodeFormat.QR_CODE, size, size, hints);StringBuilder sbPath = new StringBuilder();int width = bitMatrix.getWidth();int height = bitMatrix.getHeight();BitArray row = new BitArray(width);for (int y = 0; y < height; ++y) {row = bitMatrix.getRow(y, row);for (int x = 0; x < width; ++x) {if (row.get(x)) {sbPath.append(" M" + x + "," + y + "h1v1h-1z");}}}StringBuilder sb = new StringBuilder();sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");sb.append("<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 ").append(width).append(" ").append(height).append("\" stroke=\"none\">\n");sb.append("<style type=\"text/css\">\n");sb.append(".black {fill:#000000;}\n");sb.append("</style>\n");sb.append("<path class=\"black\"  d=\"").append(sbPath).append("\"/>\n");sb.append("</svg>\n");return sb.toString();}}需要的依赖 <!--zxing二维码生成 -->
<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.3.1</version>
</dependency>
<dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.2.1</version>
</dependency>
<dependency><groupId>de.erichseifert.vectorgraphics2d</groupId><artifactId>VectorGraphics2D</artifactId><version>0.9.3</version>
</dependency>
<dependency><groupId>net.sf.barcode4j</groupId><artifactId>barcode4j</artifactId><version>2.1</version>
</dependency>
<dependency><groupId>de.erichseifert.vectorgraphics2d</groupId><artifactId>VectorGraphics2D</artifactId><version>0.9.3</version>
</dependency>

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