二维码图片

admin/pom.xml

@@ -151,6 +151,16 @@
 <!--            <artifactId>spire.xls</artifactId>-->
 <!--            <version>13.3.1</version>-->
 <!--        </dependency>-->
+        <dependency>
+            <groupId>com.google.zxing</groupId>
+            <artifactId>core</artifactId>
+            <version>3.1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.zxing</groupId>
+            <artifactId>javase</artifactId>
+            <version>3.1.0</version>
+        </dependency>
 
     </dependencies>
 

admin/src/main/java/com/huimv/farm/damsubsidy/service/impl/AreaByLevelServiceImpl.java

@@ -1,6 +1,7 @@
 package com.huimv.farm.damsubsidy.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.toolkit.StringUtils;
 import com.huimv.farm.damsubsidy.common.utils.Result;
 import com.huimv.farm.damsubsidy.common.utils.ResultCode;
 import com.huimv.farm.damsubsidy.entity.*;

admin/src/main/java/com/huimv/farm/damsubsidy/test/QrCodeExcelPrinter.java

@@ -0,0 +1,107 @@
+package com.huimv.farm.damsubsidy.test;
+
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.QRCodeWriter;
+
+
+public class QrCodeExcelPrinter {
+    
+    private static final String QRCODE_IMAGE_PATH = "D://qrcode.png"; // 二维码图片路径
+//    private static final String EXCEL_PATH = "qrcode_excel.xls"; // Excel文件路径
+    
+    public static void main(String[] args) throws Exception {
+        String content = "https://www.baidu.com"; // 二维码内容
+        int width = 300; // 二维码宽度
+        
+        // 生成二维码图片
+        BufferedImage qrCodeImage = generateQrCodeImage(content, width);
+        ImageIO.write(qrCodeImage, "png", new File(QRCODE_IMAGE_PATH));
+        
+        // 使用JXL库生成Excel
+      /*  WritableWorkbook workbook = Workbook.createWorkbook(new File(EXCEL_PATH));
+        WritableSheet sheet = workbook.createSheet("Sheet1", 0);
+
+        // 设置单元格格式
+        Font font = new WritableFont(WritableFont.TIMES, 12, WritableFont.BOLD);
+        CellFormat labelFormat = new WritableCellFormat(font);
+        labelFormat.setAlignment(jxl.format.Alignment.CENTRE);
+        labelFormat.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
+        labelFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
+
+        // 插入二维码图片
+        WritableImage qrCodeWritableImage = new WritableImage(0, 0, 5, 5, new File(QRCODE_IMAGE_PATH));
+        sheet.addImage(qrCodeWritableImage);
+        sheet.setRowView(0, 800); // 设置第1行的行高
+
+        // 插入二维码内容
+        String[] contentArray = splitContent(content, 20); // 将二维码内容每20个字符分割为一行
+        for (int i = 0; i < contentArray.length; i++) {
+            Label contentLabel = new Label(1, i, contentArray[i], labelFormat);
+            sheet.addCell(contentLabel);
+            sheet.setRowView(i, 800); // 设置行高
+        }
+
+        workbook.write();
+        workbook.close();*/
+    }
+    
+    /**
+     * 生成二维码图片
+     * @param content 二维码内容
+     * @param width 二维码图片宽度
+     * @return 二维码图片
+     * @throws Exception
+     */
+    private static BufferedImage generateQrCodeImage(String content, int width) throws Exception {
+        QRCodeWriter writer = new QRCodeWriter();
+        BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, width, width);
+        int w = matrix.getWidth();
+        int h = matrix.getHeight();
+        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
+        Graphics2D graphics = image.createGraphics();
+        graphics.setColor(Color.WHITE);
+        graphics.fillRect(0, 0, w, h);
+        graphics.setColor(Color.BLACK);
+        for (int x = 0; x < w; x++) {
+            for (int y = 0; y < h; y++) {
+                if (matrix.get(x, y)) {
+                    graphics.fillRect(x, y, 1, 1);
+                }
+            }
+        }
+        return image;
+    }
+    
+    /**
+     * 将字符串每n个字符分割为一行
+     * @param str 字符串
+     * @param n 长度
+     * @return 分割后的字符串数组
+     */
+    private static String[] splitContent(String str, int n) {
+        int strLength = str.length();
+        int size = strLength / n;
+        if (strLength % n != 0) {
+            size++;
+        }
+        String[] result = new String[size];
+        for (int i = 0; i < size; i++) {
+            if (i == size - 1) {
+                result[i] = str.substring(i * n);
+            } else {
+                result[i] = str.substring(i * n, (i + 1) * n);
+            }
+        }
+        return result;
+    }
+
+}