为数据列表的每条记录生成对应的二维码-编程知识

效果图：

一、前端

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">
<head><th:block th:include="include :: header('固定资产信息列表')" />
</head>
<body class="gray-bg"><div class="container-div"><div class="row"><div class="col-sm-12 search-collapse"><form id="formId"><div class="select-list"><ul><li><label>资产名称：</label><input type="text" name="zcmc"/></li><li><label>资产型号：</label><input type="text" name="zcxh"/></li><li><a class="btn btn-primary btn-rounded btn-sm" onclick="$.table.search()"><i class="fa fa-search"></i>&nbsp;搜索</a><a class="btn btn-warning btn-rounded btn-sm" onclick="$.form.reset()"><i class="fa fa-refresh"></i>&nbsp;重置</a></li></ul></div></form></div><div class="btn-group-sm" id="toolbar" role="group"><a class="btn btn-success" onclick="$.operate.add()" shiro:hasPermission="biz:gdzcxx:add"><i class="fa fa-plus"></i> 添加</a><a class="btn btn-primary single disabled" onclick="$.operate.edit()" shiro:hasPermission="biz:gdzcxx:edit"><i class="fa fa-edit"></i> 修改</a><a class="btn btn-danger multiple disabled" onclick="$.operate.removeAll()" shiro:hasPermission="biz:gdzcxx:remove"><i class="fa fa-remove"></i> 删除</a><a class="btn btn-warning" onclick="$.table.exportExcel()" shiro:hasPermission="biz:gdzcxx:export"><i class="fa fa-download"></i> 导出</a></div><div class="col-sm-12 select-table table-striped"><table id="bootstrap-table"></table></div></div></div><th:block th:include="include :: footer" /><script th:inline="javascript">var qrcodeFlag = [[${@permission.hasPermi('biz:gdzcxx:createQRCode')}]];var editFlag = [[${@permission.hasPermi('biz:gdzcxx:edit')}]];var removeFlag = [[${@permission.hasPermi('biz:gdzcxx:remove')}]];var prefix = ctx + "biz/gdzcxx";//生成二维码function createQRCode(id){$.ajax({url: prefix + "/createQRCode",data: {gdzcxxid:id},type: 'POST',success: function (result) {$.table.refresh();}});}$(function() {var options = {url: prefix + "/list",createUrl: prefix + "/add",updateUrl: prefix + "/edit/{id}",removeUrl: prefix + "/remove",exportUrl: prefix + "/export",modalName: "固定资产信息",columns: [{checkbox: true},{field: 'gdzcxxId',title: '资产ID'},{field: 'zcmc',title: '资产名称'},{field: 'zcxh',title: '资产型号'},{field: 'ewm',title: '二维码',formatter:function(value, row, index){var imageDataUrl = 'data:image/png;base64,' + value;return "<img src='"+imageDataUrl+"' width='100' height='100' />";}},{field: 'bz',title: '备注'},{title: '操作',align: 'center',formatter: function(value, row, index) {var actions = [];actions.push('<a class="btn btn-success btn-xs ' + editFlag + '" href="javascript:void(0)" onclick="$.operate.edit(\'' + row.gdzcxxId + '\')"><i class="fa fa-edit"></i>编辑</a> ');actions.push('<a class="btn btn-danger btn-xs ' + removeFlag + '" href="javascript:void(0)" onclick="$.operate.remove(\'' + row.gdzcxxId + '\')"><i class="fa fa-remove"></i>删除</a>');actions.push('<a class="btn btn-success btn-xs ' + qrcodeFlag + '" href="javascript:void(0)" onclick="createQRCode(\'' + row.gdzcxxId + '\')"><i class="fa fa-edit"></i>生成二维码</a> ');return actions.join('');}}]};$.table.init(options);});</script>
</body>
</html>

二、后端

<!--二维码--><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.4.1</version></dependency><dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.4.1</version></dependency>

@Controller
@RequestMapping("/biz/gdzcxx")
public class BizGdzcxxController extends BaseController
{private String prefix = "biz/gdzcxx";/*** 创建二维码*/@RequiresPermissions("biz:gdzcxx:createQRCode")@PostMapping("/createQRCode")public String createQRCode(String gdzcxxid) throws IOException, WriterException {//根据ID取记录，并为其生成二维码BizGdzcxx bizGdzcxx = bizGdzcxxService.selectBizGdzcxxByGdzcxxId(Long.valueOf(gdzcxxid));QRCode qrCode = new QRCode();//二维码物理存放路径String uploadPath = "D:/qrcode";qrCode.setFilePath(uploadPath + "/ewm/gdzcxx/" + bizGdzcxx.getZcmc() + ".png");//二维码内容：http://localhost:8088/prefix/info/1qrCode.setQrCodeData("/" + prefix + "/info/" + bizGdzcxx.getGdzcxxId());//创建二维码qrCodeService.createQRCode(qrCode);//将二维码转二进制FileInputStream fis = new FileInputStream(qrCode.getFilePath());byte[] bytes = FileCopyUtils.copyToByteArray(fis);//二进制入库bizGdzcxx.setEwm(bytes);bizGdzcxxService.updateBizGdzcxx(bizGdzcxx);return prefix + "/gdzcewm";}


import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.chenf.biz.domain.QRCode;
import com.chenf.biz.service.IQRCodeService;
import org.springframework.stereotype.Service;import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;@Service
public class QRCodeServiceImpl implements IQRCodeService {@Overridepublic void createQRCode(QRCode qrCode) throws IOException, WriterException {QRCodeWriter qrCodeWriter = new QRCodeWriter();Map<EncodeHintType, Object> hintMap = new HashMap<>();hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);hintMap.put(EncodeHintType.CHARACTER_SET, qrCode.getCharset());BitMatrix matrix = qrCodeWriter.encode(new String(qrCode.getQrCodeData().getBytes(qrCode.getCharset()), qrCode.getCharset()),//BitMatrix matrix = qrCodeWriter.encode(qrCode.getQrCodeData(),BarcodeFormat.QR_CODE, qrCode.getQrCodeWidth(), qrCode.getQrCodeHeight(), hintMap);Path path = Paths.get(qrCode.getFilePath());if (!Files.exists(path)) {try {Files.createDirectories(path);System.out.println("Path created!");} catch (Exception e) {System.out.println("An error occurred while creating the path: " + e.getMessage());}} else {System.out.println("Path already exists!");}MatrixToImageWriter.writeToPath(matrix, qrCode.getFilePath().substring(qrCode.getFilePath().lastIndexOf('.') + 1), path);}
}

import com.google.zxing.WriterException;
import com.chenf.biz.domain.QRCode;import java.io.IOException;public interface IQRCodeService {void createQRCode(QRCode qrCode) throws IOException, WriterException;
}


/*** 二维码*/
public class QRCode {//二维码内容private String qrCodeData;//二维码存放路径private String filePath;private String charset="UTF-8";//二维码调度private int qrCodeHeight=200;//二维码宽度private int qrCodeWidth=200;public String getQrCodeData(){return this.qrCodeData;}public void setQrCodeData(String qrCodeData){ this.qrCodeData = qrCodeData;}public String getFilePath(){return this.filePath;}public void setFilePath(String filePath){ this.filePath = filePath;}public String getCharset(){return this.charset;}public void setCharset(String charset){ this.charset = charset;}public int getQrCodeHeight(){return this.qrCodeHeight;}public void setQrCodeHeight(int qrCodeHeight){ this.qrCodeHeight = qrCodeHeight;}public int getQrCodeWidth(){return this.qrCodeWidth;}public void setQrCodeWidth(int qrCodeWidth){ this.qrCodeWidth = qrCodeWidth;}
}

《完结》