基于 Spring Boot 博客系统开发（八）

本系统是简易的个人博客系统开发，为了更加熟练地掌握 SprIng Boot 框架及相关技术的使用。🌿🌿🌿
基于 Spring Boot 博客系统开发（七）👈👈

仪表盘实现效果

显示文章总数、评论总数、最新文章和最新留言。实现步骤，首先后端获取文章评论相关数据，然后前端使用thymeleaf获取后端model中的数据进行渲染。

后台首页 AdminController

获取最新文章列表、最新评论列表和page对象

@Controller
@RequestMapping("/admin")
public class AdminController {@Autowiredprivate IArticleService articleService;@Autowiredprivate ICommentService commentService;/*** 后台首页*/@RequestMapping("/")public String home(Model model){//int articleTotal = articleService.count();//int commentTotal = commentService.count();PageHelper.startPage(1,5);List<LatestArticleVO> latestArticleVOList = articleService.selectLatestArticle();PageInfo<LatestArticleVO> articlePage = new PageInfo<LatestArticleVO>(latestArticleVOList);PageHelper.startPage(1,5,"created desc");List<Comment> commentList = commentService.list();PageInfo<Comment> commentPage = new PageInfo<>(commentList);model.addAttribute("articlePage",articlePage);model.addAttribute("commentPage",commentPage);return "admin/index";}@RequestMapping("/list")public String list(){return "admin/list";}@RequestMapping("/edit")public String edit(){return "admin/edit";}}

创建VO对象，LatestArticleVO。实体对象不满足所需渲染属性的情况下，创建自定义属性视图对象，

@Data
public class LatestArticleVO {private Long id;private String title;private Integer hits;}

编写最新文章列表的SQL、Mapper、service。首先，在Mapper中自定义查询SQL
ArticleMapper.xml

    <resultMap id="LatestArticleVOResult" type="LatestArticleVO"><id property="id" column="id"></id><result property="title" column="title"></result><result property="hits" column="hits"></result></resultMap><select id="selectLatestArticle" resultMap="LatestArticleVOResult">SELECT a.id, a.title,s.hits FROM t_article a LEFT JOIN t_statistic s ON s.article_id = a.id order by a.created desc</select>

ArticleMapper，方法名selectLatestArticle与上面select标签id属性的名一致

@Mapper
public interface ArticleMapper extends BaseMapper<Article> {List<HotArticleVO> selectHotArticle();List<LatestArticleVO> selectLatestArticle();}

IArticleService，创建service接口类

public interface IArticleService extends IService<Article> {public List<HotArticleVO> selectHotArticle();List<LatestArticleVO> selectLatestArticle();}

ArticleServiceImpl，调用mapper层方法

@Service
public class ArticleServiceImpl extends ServiceImpl<ArticleMapper, Article> implements IArticleService {@Autowiredprivate ArticleMapper articleMapper;@Overridepublic List<HotArticleVO> selectHotArticle() {return articleMapper.selectHotArticle();}@Overridepublic List<LatestArticleVO> selectLatestArticle() {return articleMapper.selectLatestArticle();}}

后台首页内容前端代码实现

使用thymeleaf模板引擎渲染

  <div class="content-page"><div class="content"><div class="container"><div class="row"><div class="col-sm-12"><h4 class="page-title">仪表盘</h4></div><div class="row"><div class="col-sm-6 col-lg-3"><div class="mini-stat clearfix bx-shadow bg-info"><span class="mini-stat-icon"><i class="fa fa-quote-right" aria-hidden="true"></i></span><div class="mini-stat-info text-right">发表了<span class="counter" th:text="${articlePage.total}">12</span>篇文章</div></div></div><div class="col-sm-6 col-lg-3"><div class="mini-stat clearfix bg-purple bx-shadow"><span class="mini-stat-icon"><i class="fa fa-comments-o" aria-hidden="true"></i></span><div class="mini-stat-info text-right">收到了<span class="counter" th:text="${commentPage.total}">10</span>条留言</div></div></div></div><div class="row"><div class="col-md-4"><div class="panel panel-default"><div class="panel-heading"><h4 class="panel-title">最新文章</h4></div><div class="panel-body"><ul class="list-group"><li th:each="article:${articlePage.list}" class="list-group-item"><span class="badge badge-primary" th:text="${article.hits}">1</span><a target="_blank" th:href="${'/article/'+article.id}" th:text="${article.title}">Spring Boot 2 权威发布</a></li></ul></div></div></div><div class="col-md-4"><div class="panel panel-default"><div class="panel-heading"><h4 class="panel-title">最新留言</h4></div><div class="panel-body"><ul class="list-group"><li th:each="comment:${commentPage.list}" class="list-group-item">[[${comment.author}]]于 [[${#dates.format(comment.created,'YYYY-MM-dd')}]]：<a th:href="${'/article/'+comment.articleId+'#comments'}" target="_blank" ><p th:text="${comment.content}">151235</p></a></li></ul></div></div></div></div></div></div></div></div>