java生成矢量条形码二维码
Posted 波子汽水yeah
tags:
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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")
@ResponseBody
public 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")
@ResponseBody
public 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" style="fill:rgb(0,0,0);stroke:none" /><rect x="10" y="29" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="9" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="11" width="1" height="3" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="15" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="17" width="1" height="4" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="23" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="25" width="1" height="3" style="fill:rgb(0,0,0);stroke:none" /><rect x="11" y="29" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" y="9" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" y="11" width="1" height="3" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" y="15" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" y="17" width="1" height="2" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" y="20" width="1" height="1" style="fill:rgb(0,0,0);stroke:none" /><rect x="12" 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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>
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