2.7 查看标签下的博客列表的功能

src/main/java/cn/meteor/beyondclouds/modules/blog/api/BlogApi.java

@@ -161,4 +161,17 @@ public class BlogApi {
         PageVO<Blog> blogPageVO = new PageVO<>(blogPage);
         PageVO<Blog> blogPageVO = new PageVO<>(blogPage);
         return Response.success(blogPageVO);
         return Response.success(blogPageVO);
     }
     }
+
+    @Anonymous
+    @ApiOperation("查看标签下的博客列表")
+    @GetMapping("/tag/{tagId}/blogs")
+    public Response<?> getBlogsByTagId(@PathVariable("tagId") String tagId , @Valid PageForm pageForm , BindingResult result) {
+        if (result.hasErrors()) {
+            return Response.fieldError(result.getFieldError());
+        }
+
+        IPage<Blog> blogPage = blogService.getBlogsBytagId(pageForm.getPage(), pageForm.getSize(), tagId);
+        PageVO<Blog> blogPageVO = new PageVO<>(blogPage);
+        return Response.success(blogPageVO);
+    }
 }
 }

src/main/java/cn/meteor/beyondclouds/modules/blog/service/IBlogService.java

@@ -87,5 +87,14 @@ public interface IBlogService extends IService<Blog> {
      * @return
      * @return
      */
      */
     IPage<Blog> getHotBlogPage(Integer pageNumber , Integer pageSize);
     IPage<Blog> getHotBlogPage(Integer pageNumber , Integer pageSize);
+
+    /**
+     * 根据标签Id查询博客
+     * @param pageNumber
+     * @param pageSize
+     * @param tagId
+     * @return
+     */
+    IPage<Blog> getBlogsBytagId(Integer pageNumber , Integer pageSize , String tagId);
 }
 }
 
 

src/main/java/cn/meteor/beyondclouds/modules/blog/service/IBlogTagService.java

 package cn.meteor.beyondclouds.modules.blog.service;
 package cn.meteor.beyondclouds.modules.blog.service;
 
 
 import cn.meteor.beyondclouds.modules.blog.entity.BlogTag;
 import cn.meteor.beyondclouds.modules.blog.entity.BlogTag;
+import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.service.IService;
 import com.baomidou.mybatisplus.extension.service.IService;
 
 
 /**
 /**
@@ -13,4 +14,12 @@ import com.baomidou.mybatisplus.extension.service.IService;
  */
  */
 public interface IBlogTagService extends IService<BlogTag> {
 public interface IBlogTagService extends IService<BlogTag> {
 
 
+    /**
+     * 根据标签获取博客ID
+     * @param pageNumber
+     * @param pageSize
+     * @param tagId
+     * @return
+     */
+    IPage<BlogTag> getBlogIdByTagId (Integer pageNumber , Integer pageSize , String tagId);
 }
 }

src/main/java/cn/meteor/beyondclouds/modules/blog/service/impl/BlogServiceImpl.java

@@ -463,4 +463,17 @@ public class BlogServiceImpl extends ServiceImpl<BlogMapper, Blog> implements IB
         IPage<Blog> page = new Page<>(pageNumber, pageSize);
         IPage<Blog> page = new Page<>(pageNumber, pageSize);
          return blogMapper.selectPageWithTags(page, blogQueryWrapper);
          return blogMapper.selectPageWithTags(page, blogQueryWrapper);
     }
     }
+
+    @Override
+    public IPage<Blog> getBlogsBytagId(Integer pageNumber, Integer pageSize, String tagId) {
+        IPage<Blog> blogPage = new Page<>(pageNumber , pageSize);
+        //获取当tagId下的所有blogId
+        List<String> blogIds = blogTagService.getBlogIdByTagId(pageNumber, pageSize, tagId)
+                                .getRecords().stream().map(BlogTag::getBlogId).collect(Collectors.toList());
+
+        //批量查找博客
+        QueryWrapper<Blog> blogQueryWrapper = new QueryWrapper<>();
+        blogQueryWrapper.in("b.blog_id", blogIds);
+        return blogMapper.selectPageWithTags(blogPage,blogQueryWrapper);
+    }
 }
 }

src/main/java/cn/meteor/beyondclouds/modules/blog/service/impl/BlogTagServiceImpl.java

@@ -3,6 +3,9 @@ package cn.meteor.beyondclouds.modules.blog.service.impl;
 import cn.meteor.beyondclouds.modules.blog.entity.BlogTag;
 import cn.meteor.beyondclouds.modules.blog.entity.BlogTag;
 import cn.meteor.beyondclouds.modules.blog.mapper.BlogTagMapper;
 import cn.meteor.beyondclouds.modules.blog.mapper.BlogTagMapper;
 import cn.meteor.beyondclouds.modules.blog.service.IBlogTagService;
 import cn.meteor.beyondclouds.modules.blog.service.IBlogTagService;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.stereotype.Service;
 import org.springframework.stereotype.Service;
 
 
@@ -17,4 +20,13 @@ import org.springframework.stereotype.Service;
 @Service
 @Service
 public class BlogTagServiceImpl extends ServiceImpl<BlogTagMapper, BlogTag> implements IBlogTagService {
 public class BlogTagServiceImpl extends ServiceImpl<BlogTagMapper, BlogTag> implements IBlogTagService {
 
 
+
+    @Override
+    public IPage<BlogTag> getBlogIdByTagId(Integer pageNumber, Integer pageSize, String tagId) {
+        IPage<BlogTag> page = new Page<>(pageNumber, pageSize);
+        //获取博客ID
+        QueryWrapper<BlogTag> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("tag_id", tagId);
+        return page(page , queryWrapper);
+    }
 }
 }