文章

# 热门文章

需求：按浏览量排序，展示文章标题和浏览量，只展示正式文章

VO：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class HotArticleVo {
    private Long id;
    //标题
    private String title;
    //访问量
    private Long viewCount;
}

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接口：

@GetMapping("/hotArticleList")
@ApiOperation(value = "热门文章")
public ResponseResult hotArticleList(){
    ResponseResult result = articleService.hotArticleList();
    return result;
}

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@Override
public ResponseResult hotArticleList() {
    LambdaQueryWrapper<Article> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(Article::getStatus, SystemConstants.ARTICLE_STATUS_NORMAL)
            .orderByDesc(Article::getViewCount);
    Page<Article> page = new Page(1, 10);
    page(page,queryWrapper);
    List<Article> articles = page.getRecords();
    List<HotArticleVo> hotArticleVos = BeanCopyUtils.copyBeanList(articles, HotArticleVo.class);
    return ResponseResult.okResult(hotArticleVos);
}

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# 分类文章列表

VO：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class CategoryVo {
    private Long id;
    private String name;
}

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接口：

@ApiOperation(value = "文章分类列表")
@GetMapping("/getCategoryList")
public ResponseResult getCategoryList() {
    return categoryService.getCategoryList();
}

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Article中有categoryId属性；

@Override
public ResponseResult getCategoryList() {
    LambdaQueryWrapper<Article> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(Article::getStatus, SystemConstants.ARTICLE_STATUS_NORMAL);
    List<Article> articleList = articleService.list(queryWrapper);
    Set<Long> CategoryIds = articleList.stream().map(article -> article.getCategoryId()).collect(Collectors.toSet());
    List<Category> categories = listByIds(CategoryIds);
    categories = categories.stream()
            .filter(category -> SystemConstants.STATUS_NORMAL.equals(category.getStatus()))
            .collect(Collectors.toList());
    List<CategoryVo> categoryVos = BeanCopyUtils.copyBeanList(categories, CategoryVo.class);
    return ResponseResult.okResult(categoryVos);
}

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# 根据目录分页文章列表

在实体类Artilce中添加不存在的数据库字段categoryName；

@Accessors(chain = true)

@TableField(exist = false)
private String categoryName;

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VO：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class ArticleListVo {

    private Long id;
    //标题
    private String title;
    //文章摘要
    private String summary;
    //所属分类名
    private String categoryName;
    //缩略图
    private String thumbnail;
    //访问量
    private Long viewCount;

    private Date createTime;

}

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@Data
@NoArgsConstructor
@AllArgsConstructor
public class PageVo {
    private List rows;
    private Long total;
}

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接口：

@GetMapping("/articleList/{pageNum}/{pageSize}/{categoryId}")
@ApiOperation(value = "文章分页展示")
public ResponseResult articleList(@PathVariable Integer pageNum,@PathVariable Integer pageSize,@PathVariable("categoryId") Long categoryId){
    return articleService.articleList(pageNum,pageSize,categoryId);
}

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@Autowired
private CategoryService categoryService;

@Override
public ResponseResult articleList(Integer pageNum, Integer pageSize, Long categoryId) {
    LambdaQueryWrapper<Article> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(Objects.nonNull(categoryId) && categoryId>0,Article::getCategoryId,categoryId)
                .eq(Article::getStatus,SystemConstants.ARTICLE_STATUS_NORMAL)
                .orderByDesc(Article::getIsTop);
    Page<Article> page = new Page<>(pageNum, pageSize);
    page(page,queryWrapper);
    List<Article> articles = page.getRecords();
    // artilce表中没有categoryName字段
    articles.stream().map(article->article.setCategoryName(categoryService.getById(article.getCategoryId()).getName()))
            .collect(Collectors.toList());
    // 封装VO
    List<ArticleListVo> articleListVos = BeanCopyUtils.copyBeanList(articles,ArticleListVo.class);
    PageVo pageVo = new PageVo(articleListVos, page.getTotal());
    return ResponseResult.okResult(pageVo);
}

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# 文章详情

VO：

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ArticleDetailVo {

    private Long id;
    private String title;
    private String summary;
    private Long categoryId;
    private String categoryName;
    private String thumbnail;

    private Long viewCount;
    private Date createTime;
    private String content;
}

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接口：

@GetMapping("/{id}")
@ApiOperation(value = "文章详情")
public ResponseResult getArticleDetail(@PathVariable("id") Long id){
    return articleService.getArticleDetail(id);
}

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@Override
public ResponseResult getArticleDetail(Long id) {
    Article article = getById(id);
    ArticleDetailVo articleDetailVo = BeanCopyUtils.copyBean(article, ArticleDetailVo.class);
    //添加 categroyName
    Long categoryId = articleDetailVo.getCategoryId();
    Category category = categoryService.getById(categoryId);
    if(category!=null){
        articleDetailVo.setCategoryName(category.getName());
    }
    return ResponseResult.okResult(articleDetailVo);
}

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