feat: 修复登录页面验证码功能

后端修复：
- 启用验证码功能（captchaEnabled: true）
- 实现验证码图片生成（Java Graphics2D绘制）
- 实现验证码存储和验证逻辑（内存ConcurrentHashMap）
- 验证码包含干扰线、噪点、随机颜色和角度

前端修复：
- 正确获取登录响应中的token（res.data.token）
- 登录失败时显示错误消息并刷新验证码

pangu-system/src/main/java/com/pangu/web/controller/system/SysLoginController.java

@@ -3,8 +3,12 @@ package com.pangu.web.controller.system;
 import com.pangu.common.core.domain.AjaxResult;
 import org.springframework.web.bind.annotation.*;
 
-import java.util.HashMap;
+import javax.imageio.ImageIO;
-import java.util.Map;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * 登录控制器
@@ -14,6 +18,11 @@ import java.util.Map;
 @RestController
 public class SysLoginController {
 
+    /**
+     * 验证码存储（开发阶段使用内存，生产环境应使用Redis）
+     */
+    private static final Map<String, String> CAPTCHA_CACHE = new ConcurrentHashMap<>();
+
     /**
      * 获取用户信息
      */
@@ -39,6 +48,27 @@ public class SysLoginController {
      */
     @PostMapping("/api/login")
     public AjaxResult login(@RequestBody Map<String, String> loginBody) {
+        String username = loginBody.get("username");
+        String password = loginBody.get("password");
+        String code = loginBody.get("code");
+        String uuid = loginBody.get("uuid");
+
+        // 验证码校验
+        if (uuid != null && !uuid.isEmpty()) {
+            String cachedCode = CAPTCHA_CACHE.remove(uuid);
+            if (cachedCode == null) {
+                return AjaxResult.error("验证码已过期");
+            }
+            if (code == null || !cachedCode.equalsIgnoreCase(code)) {
+                return AjaxResult.error("验证码错误");
+            }
+        }
+
+        // 用户名密码校验（开发阶段简单校验）
+        if (!"admin".equals(username) || !"admin123".equals(password)) {
+            return AjaxResult.error("用户名或密码错误");
+        }
+
         Map<String, Object> data = new HashMap<>();
         data.put("token", "mock-token-" + System.currentTimeMillis());
         return AjaxResult.success(data);
@@ -57,10 +87,98 @@ public class SysLoginController {
      */
     @GetMapping("/api/captchaImage")
     public AjaxResult getCaptchaImage() {
+        String uuid = UUID.randomUUID().toString();
+        String code = generateCaptchaCode(4);
+        
+        // 存储验证码
+        CAPTCHA_CACHE.put(uuid, code);
+        
+        // 生成验证码图片
+        String imgBase64 = generateCaptchaImage(code);
+        
         Map<String, Object> data = new HashMap<>();
-        data.put("uuid", "mock-uuid-" + System.currentTimeMillis());
+        data.put("uuid", uuid);
-        data.put("img", "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==");
+        data.put("img", "data:image/png;base64," + imgBase64);
-        data.put("captchaEnabled", false);
+        data.put("captchaEnabled", true);
         return AjaxResult.success(data);
     }
+
+    /**
+     * 生成随机验证码字符
+     */
+    private String generateCaptchaCode(int length) {
+        String chars = "ABCDEFGHJKMNPQRSTUVWXYZabcdefghjkmnpqrstuvwxyz23456789";
+        Random random = new Random();
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < length; i++) {
+            sb.append(chars.charAt(random.nextInt(chars.length())));
+        }
+        return sb.toString();
+    }
+
+    /**
+     * 生成验证码图片（Base64编码）
+     */
+    private String generateCaptchaImage(String code) {
+        int width = 120;
+        int height = 40;
+        
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g = image.createGraphics();
+        
+        // 设置抗锯齿
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+        
+        // 背景色
+        g.setColor(new Color(240, 240, 240));
+        g.fillRect(0, 0, width, height);
+        
+        // 绘制干扰线
+        Random random = new Random();
+        g.setColor(new Color(200, 200, 200));
+        for (int i = 0; i < 6; i++) {
+            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);
+        }
+        
+        // 绘制验证码文字
+        g.setFont(new Font("Arial", Font.BOLD, 28));
+        Color[] colors = {
+            new Color(65, 105, 225),
+            new Color(220, 20, 60),
+            new Color(34, 139, 34),
+            new Color(255, 140, 0)
+        };
+        
+        for (int i = 0; i < code.length(); i++) {
+            g.setColor(colors[i % colors.length]);
+            // 随机旋转角度
+            double angle = (random.nextDouble() - 0.5) * 0.3;
+            g.rotate(angle, 25 + i * 25, 28);
+            g.drawString(String.valueOf(code.charAt(i)), 15 + i * 25, 30);
+            g.rotate(-angle, 25 + i * 25, 28);
+        }
+        
+        // 绘制噪点
+        for (int i = 0; i < 50; i++) {
+            int x = random.nextInt(width);
+            int y = random.nextInt(height);
+            g.setColor(new Color(random.nextInt(200), random.nextInt(200), random.nextInt(200)));
+            g.fillRect(x, y, 1, 1);
+        }
+        
+        g.dispose();
+        
+        // 转换为Base64
+        try {
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            ImageIO.write(image, "png", baos);
+            return Base64.getEncoder().encodeToString(baos.toByteArray());
+        } catch (Exception e) {
+            return "";
+        }
+    }
 }

pangu-ui/src/views/login/index.vue

@@ -143,9 +143,14 @@ const handleLogin = () => {
       })
       
       if (res.code === 200) {
-        userStore.setToken(res.token)
+        // token在res.data.token或res.token中
+        const token = res.data?.token || res.token
+        userStore.setToken(token)
         ElMessage.success('登录成功')
         router.push('/')
+      } else {
+        ElMessage.error(res.msg || '登录失败')
+        getCaptcha()
       }
     } catch (error) {
       // 登录失败刷新验证码