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auth/src/main/java/com/example/springboot4/util/CaptchaUtil.java

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+package com.example.springboot4.util;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+import java.util.Random;
+
+public class CaptchaUtil {
+    
+    private static final char[] CHARS = {'2', '3', '4', '5', '6', '7', '8', '9',
+                                         'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
+                                         'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
+    
+    private static final int SIZE = 4;
+    private static final int LINES = 5;
+    private static final int WIDTH = 120;
+    private static final int HEIGHT = 40;
+    
+    /**
+     * 生成验证码图片和文本
+     */
+    public static Captcha generateCaptcha() {
+        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
+        Graphics g = image.getGraphics();
+        
+        // 设置背景色
+        g.setColor(Color.WHITE);
+        g.fillRect(0, 0, WIDTH, HEIGHT);
+        
+        // 生成随机验证码
+        Random random = new Random();
+        StringBuilder captchaText = new StringBuilder();
+        for (int i = 0; i < SIZE; i++) {
+            char c = CHARS[random.nextInt(CHARS.length)];
+            captchaText.append(c);
+        }
+        
+        // 绘制验证码文本
+        // 使用系统默认字体替代指定字体
+        // g.setFont(new Font("Arial", Font.BOLD, 24));
+        Font font = new Font(null, Font.BOLD, 24);
+        g.setFont(font);
+        
+        for (int i = 0; i < captchaText.length(); i++) {
+            g.setColor(getRandomColor());
+            g.drawString(String.valueOf(captchaText.charAt(i)), 20 + i * 20, 30);
+        }
+        
+        // 绘制干扰线
+        for (int i = 0; i < LINES; i++) {
+            g.setColor(getRandomColor());
+            int x1 = random.nextInt(WIDTH);
+            int y1 = random.nextInt(HEIGHT);
+            int x2 = random.nextInt(WIDTH);
+            int y2 = random.nextInt(HEIGHT);
+            g.drawLine(x1, y1, x2, y2);
+        }
+        
+        g.dispose();
+        
+        // 将图片转换为Base64编码
+        String base64Image = imageToBase64(image);
+        
+        return new Captcha(captchaText.toString(), base64Image);
+    }
+    
+    /**
+     * 获取随机颜色
+     */
+    private static Color getRandomColor() {
+        Random random = new Random();
+        return new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256));
+    }
+    
+    /**
+     * 将BufferedImage转换为Base64编码
+     */
+    private static String imageToBase64(BufferedImage image) {
+        try {
+            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+            ImageIO.write(image, "png", outputStream);
+            byte[] imageBytes = outputStream.toByteArray();
+            return Base64.getEncoder().encodeToString(imageBytes);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to convert image to Base64", e);
+        }
+    }
+    
+    /**
+     * 验证码数据类
+     */
+    public static class Captcha {
+        private final String text;
+        private final String imageBase64;
+        
+        public Captcha(String text, String imageBase64) {
+            this.text = text;
+            this.imageBase64 = imageBase64;
+        }
+        
+        public String getText() {
+            return text;
+        }
+        
+        public String getImageBase64() {
+            return imageBase64;
+        }
+    }
+}

auth/src/main/java/com/example/springboot4/util/RsaKeyLoader.java

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+package com.example.springboot4.util;
+
+
+import org.springframework.util.ResourceUtils;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+
+/**
+ * RSA密钥加载器
+ * 用于从本地文件加载RSA密钥对
+ */
+public class RsaKeyLoader {
+
+    /**
+     * 从指定路径加载私钥
+     *
+     * @param privateKeyPath 私钥文件路径
+     * @return PrivateKey 私钥对象
+     * @throws IOException            IO异常
+     * @throws ClassNotFoundException 类未找到异常
+     */
+    public static PrivateKey loadPrivateKey(String privateKeyPath) throws IOException, ClassNotFoundException {
+        try (ObjectInputStream ois = new ObjectInputStream(Files.newInputStream(Path.of(privateKeyPath)))) {
+            return (PrivateKey) ois.readObject();
+        }
+    }
+
+    /**
+     * 从指定路径加载公钥
+     *
+     * @param publicKeyPath 公钥文件路径
+     * @return PublicKey 公钥对象
+     * @throws IOException            IO异常
+     * @throws ClassNotFoundException 类未找到异常
+     */
+    public static PublicKey loadPublicKey(String publicKeyPath) throws IOException, ClassNotFoundException {
+        try (ObjectInputStream ois = new ObjectInputStream(Files.newInputStream(Path.of(publicKeyPath)))) {
+            return (PublicKey) ois.readObject();
+        }
+    }
+}