利用zxing源码包批量生成二维码，压缩并下载到本地

Posted 2020-11-02 onebreeze1855

在日常生活中，经常会使用手机扫各种二维码，或进行手机支付，但对于二维码是如何生成的，我做了小小的总结。

此处借用实际项目中业务进行说明：对每个重点部位(实体类：AppKeyPart)生成二维码，并实现批量下载

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前端实现(jsp+jquery)

>>>jsp代码

1 <my:access key="keyPart.qrCodeDownload"><input type="button" class="button orange" value="批量下载二维码" id="batchDownloadQrCode" /></my:access>

View Code

 1 $(document).ready(function(){
 2 
 3     //批量下载二维码
 4     $("#batchDownloadQrCode").bind("click",function(){
 5             if($("input[name=‘id‘]:checked").length <= 0){
 6                 $.dialog.alert("请先选择一条或多条数据");
 7             return false;
 8             }
 9         var ids = "";
10         $("input[name=‘id‘]:checked").each(function(){
11              ids += $(this).val()+",";
12             });
13         ids = ids.substring(0, ids.lastIndexOf(","));
14                     window.location.href("${base}/political/keyPart_downloadQrCode.action?ids="+ids);
15      });
16 
17 });

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后端实现(java)

>>>实现类代码

 1     public void downloadQrCode(){
 2         String idstr = getRequest().getParameter("ids");
 3         String[] ids = idstr.split(",");
 4         
 5         String userid = SessionManager.getSessionUser().getUserid();
 6         String rootPathText = "/home/tomcat/tempexcel/"; //服务器路径
 7         //String rootPathText = "D:\\shy_work\\"; //本机测试路径
 8         String realPath = rootPathText + userid + File.separatorChar;//临时文件夹
 9         
10                 for(String id : ids){
11             KeyPart keyPart = keyPartService.getKeyPart(id);
12             
13             AppKeyPart appKeyPart = new AppKeyPart();
14             appKeyPart.setId(keyPart.getId());
15             appKeyPart.setBh(keyPart.getBh());
16             appKeyPart.setMc(keyPart.getMc());
17             appKeyPart.setSsqy(keyPart.getSsqy());
18             appKeyPart.setSzjq(keyPart.getSzjq());
19             appKeyPart.setGdlx(keyPart.getGdlx());
20             
21             JSONObject json = new JSONObject();
22             json.put("keyPart", appKeyPart);
23             String content = json.toJSONString();
24             
25             //创建文件路径，以userid命名，保证互不影响  
26                         File file = new File(realPath);
27                         if(!file.exists()){
28                         file.mkdir();
29                  }
30             
31             String filePath = realPath + keyPart.getId()+ "_" +keyPart.getBh()+".png";
32             try {
33                 QrCodeGenerateUtil.createZxing(filePath, content, 900, "png");
34             } catch (Exception e) {
35                 e.printStackTrace();
36             }
37         }
38         
39         try{
40                     File files = new File(realPath);
41                     if(!files.exists()){
42                         files.mkdir();
43                     }
44                     File[] filelist = files.listFiles();
45                     String zipFileName = userid + ".zip";
46             
47                 HttpServletResponse response = this.getResponse();
48             response.setContentType("application/octet-stream");// 指明response的返回对象是文件流 
49             response.setHeader("Content-Disposition", "attachment;filename=" + zipFileName);// 设置在下载框默认显示的文件名
50             response.reset();
51             
52             ZipOutputStream zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
53             zipos.setMethod(ZipOutputStream.DEFLATED);//设置压缩方法（系统默认是DEFLATED）
54             
55                 for(File imageFile : filelist){
56                     putZipFiles(imageFile, zipos);//加入压缩文件
57                     imageFile.delete();//删除已添加图片
58                 }
59                 zipos.close();//关闭输出流
60                 files.delete();
61   
62             } catch (Exception e) {  
63                 e.printStackTrace();
64             }
65         
66     } 

View Code

 1         /**
 2      * 将待压缩的文件 加入压缩文件中
 3      * @param imageFile
 4      * @param zos
 5      * @throws IOException
 6      * @author Jesse
 7      * @date 2018年5月3日上午11:07:34
 8      */
 9     public void putZipFiles(File imageFile,ZipOutputStream zos) throws IOException {  
10             if(imageFile != null && imageFile.exists()){
11                 //加入压缩文件中
12             zos.putNextEntry(new ZipEntry(imageFile.getName()));
13             
14                 InputStream is = null;  
15                 try {  
16                 is = new FileInputStream(imageFile);  
17                 byte[] buffer = new byte[1024 * 5];   
18                 int len = -1;  
19                 while((len = is.read(buffer)) != -1) {  
20                 //把缓冲区的字节写入到ZipEntry  
21                 zos.write(buffer, 0, len);  
22                 }  
23                 zos.closeEntry();   
24                 zos.flush();
25               
26                 }catch(Exception e) {  
27                     throw new RuntimeException(e);  
28                 }finally {  
29                 if(is != null){
30                     is.close();  
31                 }
32             }
33             }
34     }

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>>>工具类代码

  1 package cn.gentlesoft.commons.tools;
  2 
  3 import java.awt.image.BufferedImage;
  4 import java.io.File;
  5 import java.io.IOException;
  6 import java.io.OutputStream;
  7 import java.util.HashMap;
  8 import java.util.Map;
  9 
 10 import javax.imageio.ImageIO;
 11 
 12 import com.alibaba.fastjson.JSONObject;
 13 import com.google.zxing.BarcodeFormat;
 14 import com.google.zxing.Binarizer;
 15 import com.google.zxing.BinaryBitmap;
 16 import com.google.zxing.DecodeHintType;
 17 import com.google.zxing.EncodeHintType;
 18 import com.google.zxing.LuminanceSource;
 19 import com.google.zxing.MultiFormatReader;
 20 import com.google.zxing.MultiFormatWriter;
 21 import com.google.zxing.NotFoundException;
 22 import com.google.zxing.Result;
 23 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
 24 import com.google.zxing.client.j2se.MatrixToImageWriter;
 25 import com.google.zxing.common.BitMatrix;
 26 import com.google.zxing.common.HybridBinarizer;
 27 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 28 
 29 /**
 30  * 二维码生成工具
 31  * 
 32  * @author Jesse
 33  *
 34  */
 35 public class QrCodeGenerateUtil {
 36 
 37     /**
 38      * 生成包含字符串信息的二维码图片
 39      * 
 40      * @param os
 41      * @param content
 42      * @param qrCodeSize
 43      * @param imageFormat
 44      * @throws Exception
 45      */
 46     public static void createZxing(OutputStream os, String content, int qrCodeSize, String imageFormat)
 47             throws Exception {
 48         // 二维码参数
 49         Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
 50         hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
 51         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 纠错等级L,M,Q,H
 52         hints.put(EncodeHintType.MARGIN, 2); // 边距
 53         // 创建比特矩阵(位矩阵)的QR码编码的字符串
 54         BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize,
 55                 hints);
 56         MatrixToImageWriter.writeToStream(bitMatrix, imageFormat, os);
 57         System.out.println("输出图片成功。。。");
 58     }
 59 
 60     /**
 61      * 生成包含字符串信息的二维码图片
 62      * 
 63      * @param path
 64      *            二维码图片保存地址
 65      * @param content
 66      *            二维码携带信息
 67      * @param qrCodeSize
 68      *            二维码图片大小
 69      * @param imageFormat
 70      *            二维码图片格式
 71      * @throws Exception
 72      */
 73     public static void createZxing(String path, String content, int qrCodeSize, String imageFormat) throws Exception {
 74         Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
 75         hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
 76         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 纠错等级L,M,Q,H
 77         hints.put(EncodeHintType.MARGIN, 2); // 边距
 78         // 创建比特矩阵(位矩阵)的QR码编码的字符串
 79         BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize,
 80                 hints);
 81         File file = new File(path);
 82         // 使用比特矩阵画并保存图像
 83         MatrixToImageWriter.writeToFile(bitMatrix, imageFormat, file);
 84         System.out.println("输出图片成功。。。");
 85     }
 86 
 87     /**
 88      * 读取二维码并输出携带的信息
 89      * 
 90      * @param filePath
 91      *            二维码图片保存地址
 92      */
 93     public static void readZxing(String filePath) {
 94         BufferedImage image = null;
 95         try {
 96             image = ImageIO.read(new File(filePath));
 97             // 将图像转换成二进制位图源
 98             LuminanceSource source = new BufferedImageLuminanceSource(image);
 99             Binarizer binarizer = new HybridBinarizer(source);
100             BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
101             Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
102             hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
103             Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码
104             JSONObject content = JSONObject.parseObject(result.getText());
105             System.out.println("图片中内容：  ");
106             System.out.println("group：  " + content.toJSONString());
107 
108             System.out.println("图片中格式：  ");
109             System.out.println("encode： " + result.getBarcodeFormat());
110         } catch (IOException e) {
111             e.printStackTrace();
112         } catch (NotFoundException e) {
113             e.printStackTrace();
114         }
115     }
116 
117 }

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虽然现在JDK8早已被使用，但由于实际项目使用的是JDK6和IE8浏览器，很多地方受到限制，因此本次使用的二维码第三方源码库，是谷歌的zxing库。core-2.2.java ，javase-2.2.jar

如果是maven项目，也可以在项目pom.xml文件里引入：

 1 <dependency>
 2     <groupId>com.google.zxing</groupId>
 3     <artifactId>core</artifactId>
 4     <version>2.2</version>
 5 </dependency>
 6 
 7 <dependency>
 8     <groupId>com.google.zxing</groupId>
 9     <artifactId>javase</artifactId>
10     <version>2.2</version>
11 </dependency>

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到此实现了二维码批量生成 压缩 下载功能！