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src/main/java/com/example/service/AnnouncementService.java

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+package com.example.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.example.common.config.TokenUtils;
+import com.example.common.enums.ResultCodeEnum;
+import com.example.entity.Account;
+import com.example.entity.Announcement;
+import com.example.exception.CustomException;
+import com.example.mapper.AnnouncementMapper;
+import com.github.pagehelper.PageHelper;
+import com.github.pagehelper.PageInfo;
+import jakarta.annotation.Resource;
+import org.springframework.stereotype.Service;
+
+import java.util.Date;
+import java.util.List;
+
+/**
+ * 公告服务类
+ */
+@Service
+public class AnnouncementService {
+
+    @Resource
+    private AnnouncementMapper announcementMapper;
+    
+    /**
+     * 添加公告
+     * @param announcement 公告信息
+     */
+    public void add(Announcement announcement) {
+        // 获取当前用户
+        Account currentUser = TokenUtils.getCurrentUser();
+        if (currentUser == null) {
+            throw new CustomException(ResultCodeEnum.TOKEN_CHECK_ERROR);
+        }
+        
+        // 验证权限
+        if (!"admin".equals(currentUser.getRole())) {
+            throw new CustomException(ResultCodeEnum.PARAM_ERROR.code, "只有管理员可以发布公告");
+        }
+        
+        // 设置默认值
+        if (announcement.getIsTop() == null) {
+            announcement.setIsTop(false);
+        }
+        
+        if (announcement.getStatus() == null) {
+            announcement.setStatus(0); // 默认为草稿状态
+        }
+        
+        announcement.setCreateTime(new Date());
+        announcement.setPublisherId(currentUser.getId());
+        announcement.setPublisherName(currentUser.getName());
+        
+        announcementMapper.insert(announcement);
+    }
+    
+    /**
+     * 更新公告
+     * @param announcement 公告信息
+     */
+    public void update(Announcement announcement) {
+        // 获取当前用户
+        Account currentUser = TokenUtils.getCurrentUser();
+        if (currentUser == null) {
+            throw new CustomException(ResultCodeEnum.TOKEN_CHECK_ERROR);
+        }
+        
+        // 验证权限
+        if (!"admin".equals(currentUser.getRole())) {
+            throw new CustomException(ResultCodeEnum.PARAM_ERROR.code, "只有管理员可以修改公告");
+        }
+        
+        // 获取原公告
+        Announcement dbAnnouncement = announcementMapper.selectById(announcement.getId());
+        if (dbAnnouncement == null) {
+            throw new CustomException(ResultCodeEnum.PARAM_ERROR.code, "公告不存在");
+        }
+        
+        // 只更新部分字段，保留创建时间等信息
+        dbAnnouncement.setTitle(announcement.getTitle());
+        dbAnnouncement.setContent(announcement.getContent());
+        dbAnnouncement.setIsTop(announcement.getIsTop());
+        dbAnnouncement.setStatus(announcement.getStatus());
+        
+        announcementMapper.updateById(dbAnnouncement);
+    }
+    
+    /**
+     * 删除公告
+     * @param id 公告ID
+     */
+    public void delete(Integer id) {
+        // 获取当前用户
+        Account currentUser = TokenUtils.getCurrentUser();
+        if (currentUser == null) {
+            throw new CustomException(ResultCodeEnum.TOKEN_CHECK_ERROR);
+        }
+        
+        // 验证权限
+        if (!"admin".equals(currentUser.getRole())) {
+            throw new CustomException(ResultCodeEnum.PARAM_ERROR.code, "只有管理员可以删除公告");
+        }
+        
+        announcementMapper.deleteById(id);
+    }
+    
+    /**
+     * 获取公告详情
+     * @param id 公告ID
+     * @return 公告信息
+     */
+    public Announcement getById(Integer id) {
+        return announcementMapper.selectById(id);
+    }
+    
+    /**
+     * 获取所有已发布的公告（分页，所有用户可访问）
+     * @param pageNum 页码
+     * @param pageSize 每页大小
+     * @param title 标题关键字
+     * @return 分页公告列表
+     */
+    public PageInfo<Announcement> getPublishedPage(Integer pageNum, Integer pageSize, String title) {
+        PageHelper.startPage(pageNum, pageSize);
+        List<Announcement> list = announcementMapper.selectAllPublishedWithKeyword(title);
+        return new PageInfo<>(list);
+    }
+    
+    /**
+     * 获取所有公告（分页，包括草稿，仅管理员可用）
+     * @param pageNum 页码
+     * @param pageSize 每页大小
+     * @param title 标题关键字
+     * @return 分页公告列表
+     */
+    public PageInfo<Announcement> getAllForAdmin(Integer pageNum, Integer pageSize, String title) {
+        // 获取当前用户
+        Account currentUser = TokenUtils.getCurrentUser();
+        if (currentUser == null) {
+            throw new CustomException(ResultCodeEnum.TOKEN_CHECK_ERROR);
+        }
+        
+        // 验证权限
+        if (!"admin".equals(currentUser.getRole())) {
+            throw new CustomException(ResultCodeEnum.PARAM_ERROR.code, "只有管理员可以查看所有公告");
+        }
+        
+        PageHelper.startPage(pageNum, pageSize);
+        List<Announcement> list = announcementMapper.selectAllForAdmin(title);
+        return new PageInfo<>(list);
+    }
+    
+    /**
+     * 获取最新的几条已发布公告（用于首页展示）
+     * @param limit 限制条数
+     * @return 公告列表
+     */
+    public List<Announcement> getLatestPublished(Integer limit) {
+        PageHelper.startPage(1, limit);
+        return announcementMapper.selectAllPublished();
+    }
+}