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fys-admin/src/main/java/com/fuyuanshen/SimpleQR.java

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+package com.fuyuanshen;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+
+public class SimpleQR {
+    public static void main(String[] args) throws Exception {
+        String text = "HELLO";
+        int size = 21; // 版本1的大小
+        boolean[][] qr = new boolean[size][size];
+
+        // 1. 三个定位标记
+        for (int i = 0; i < 7; i++)
+            for (int j = 0; j < 7; j++) {
+                boolean black = i == 0 || i == 6 || j == 0 || j == 6 || (i > 1 && i < 5 && j > 1 && j < 5);
+                qr[i][j] = qr[i][size - 1 - j] = qr[size - 1 - i][j] = black;
+            }
+
+        // 2. 定时图案（简化）
+        for (int i = 8; i < 13; i++) qr[i][6] = qr[6][i] = (i % 2 == 0);
+
+        // 3. 编码数据（极简编码）
+        byte[] data = text.getBytes();
+        int x = 20, y = 20, up = 1; // 从右下角开始
+        for (byte b : data)
+            for (int bit = 7; bit >= 0; bit--) {
+                while (qr[x][y] || (x == 6 && y < 9) || (y == 6 && x < 9) || (x < 9 && y < 9) ||
+                        (x < 9 && y > size - 10) || (y < 9 && x > size - 10)) {
+                    if (up > 0) {
+                        if (--y < 0) {
+                            y = 0;
+                            x -= 2;
+                            up = -1;
+                        }
+                    } else {
+                        if (++y >= size) {
+                            y = size - 1;
+                            x -= 2;
+                            up = 1;
+                        }
+                    }
+                    if (x == 6) x--;
+                }
+                qr[x][y] = ((b >> bit) & 1) == 1;
+                if (up > 0) {
+                    if (--y < 0) {
+                        y = 0;
+                        x -= 2;
+                        up = -1;
+                    }
+                } else {
+                    if (++y >= size) {
+                        y = size - 1;
+                        x -= 2;
+                        up = 1;
+                    }
+                }
+                if (x == 6) x--;
+            }
+
+        // 4. 保存图像
+        int scale = 10, margin = 4;
+        BufferedImage img = new BufferedImage(
+                size * scale + margin * 2, size * scale + margin * 2, BufferedImage.TYPE_INT_RGB);
+        for (int i = 0; i < img.getWidth(); i++)
+            for (int j = 0; j < img.getHeight(); j++)
+                img.setRGB(i, j, 0xFFFFFF); // 白色背景
+
+        for (int i = 0; i < size; i++)
+            for (int j = 0; j < size; j++)
+                if (qr[i][j])
+                    for (int di = 0; di < scale; di++)
+                        for (int dj = 0; dj < scale; dj++)
+                            img.setRGB(margin + i * scale + di, margin + j * scale + dj, 0x000000);
+
+        ImageIO.write(img, "PNG", new File("qr.png"));
+        System.out.println("二维码已生成");
+    }
+
+}