feat: 添加头像下方修改按钮和头像上传功能

- mine.vue: 头像下方添加灰色修改按钮
- api.js: 添加getBaseUrl方法
- UserController.java: 添加uploadAvatar接口
- WebConfig.java: 配置静态文件服务
- 支持修改用户名和上传头像

src/main/java/xuan/controller/UserController.java

@@ -4,11 +4,18 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.client.RestTemplate;
+import org.springframework.web.multipart.MultipartFile;
 import xuan.entity.UserInfo;
 import xuan.service.UserInfoService;
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.UUID;
 
 @RestController
 @RequestMapping("/api/user")
@@ -319,4 +326,54 @@ public class UserController {
         }
         return result;
     }
+    
+    @PostMapping("/uploadAvatar")
+    public Map<String, Object> uploadAvatar(
+            @RequestParam("file") MultipartFile file,
+            @RequestParam("userId") String userId) {
+        Map<String, Object> result = new HashMap<>();
+        try {
+            if (file.isEmpty()) {
+                result.put("success", false);
+                result.put("error", "请选择文件");
+                return result;
+            }
+            
+            String uploadDir = "uploads/avatars/";
+            File dir = new File(uploadDir);
+            if (!dir.exists()) {
+                dir.mkdirs();
+            }
+            
+            String originalFilename = file.getOriginalFilename();
+            String extension = "";
+            if (originalFilename != null && originalFilename.contains(".")) {
+                extension = originalFilename.substring(originalFilename.lastIndexOf("."));
+            }
+            
+            String filename = UUID.randomUUID().toString() + extension;
+            Path filePath = Paths.get(uploadDir + filename);
+            Files.write(filePath, file.getBytes());
+            
+            String avatarUrl = "/uploads/avatars/" + filename;
+            
+            UserInfo user = userInfoService.updateAvatarUrl(userId, avatarUrl);
+            if (user != null) {
+                Map<String, Object> data = new HashMap<>();
+                data.put("avatarUrl", avatarUrl);
+                result.put("success", true);
+                result.put("data", data);
+            } else {
+                result.put("success", false);
+                result.put("error", "用户不存在");
+            }
+        } catch (IOException e) {
+            result.put("success", false);
+            result.put("error", "文件上传失败: " + e.getMessage());
+        } catch (Exception e) {
+            result.put("success", false);
+            result.put("error", e.getMessage());
+        }
+        return result;
+    }
 }