在NewRepository中添加接口(按照是否推荐进行查询):
@Query("select n from News n where n.recommend = true")
List<News> findTop(Pageable p);
1.在NewService中添加接口,并在Impl中实现
1.1接口:
//主页显示新闻列表
Page<News> listNew(Pageable pageable);
//主页推荐最新新闻列表
List<News> listRecommendNewTop(Integer size);
1.2实现:
@Override
public Page<News> listNew(Pageable pageable) {
return newRepository.findAll(pageable);
}
@Override
public List<News> listRecommendNewTop(Integer size) {
Sort sort = Sort.by(Sort.Direction.DESC,"updateTime");
Pageable pageable = PageRequest.of(0,size,sort);
return newRepository.findTop(pageable);
}
2.在TypeRepository类中添加接口(查询类型最多的新闻种类),在TagRepository类中添加接口(查询标签数目最多的新闻)
TypeRepository:
@Query("select t from Type t")
List<Type> findTop(Pageable pageable);
TagRepository:
@Query("select t from Tag t")
List<Tag> findTop(Pageable p);
3.在Service和Impl中写入与上面数据库查询相对应的逻辑实现
TypeService接口
List<Type> listTypeTop(Integer size);
TypeServiceImpl实现
@Override
public List<Type> listTypeTop(Integer size) {
Sort sort = Sort.by(Sort.Direction.DESC,"news.size");
Pageable pageable = PageRequest.of(0,size,sort);
return typeRepository.findTop(pageable);
}
TagService接口:
List<Tag> listTagTop(Integer size);
TagServiceImpl实现:
@Override
public List<Tag> listTagTop(Integer size) {
Sort sort = Sort.by(Sort.Direction.DESC,"newsList.size");
Pageable pageable = PageRequest.of(0,size,sort);
return tagRepository.findTop(pageable);
}
4.在新建的IndexController类中写入功能管理
@Controller
public class IndexController {
@Autowired
private TypeService typeService;
@Autowired
private TagService tagService;
@Autowired
private NewService newService;
@GetMapping("/")
public String index(@PageableDefault(size = 3,sort = {
"updateTime"},direction = Sort.Direction.DESC)
Pageable pageable, Model model){
model.addAttribute("page",newService.listNew(pageable));
model.addAttribute("types",typeService.listTypeTop(3));
model.addAttribute("tags",tagService.listTagTop(3));
model.addAttribute("recommendNews",newService.listRecommendNewTop(3));
return "index";
}
}
5.在index.html文件中进行一个小小修改
图中newss需改为news,与Type实体类属性名一致
同理,关于Tag的前端页面,相同位置也需进行修改,使之与实体类中属性名一致
至此,新闻首页展示完成。
1.在NewRepository中添加查询接口(按照新闻标题或是新闻简介进行查询):
@Query("select n from News n where n.title like ?1 or n.content like ?1")
Page<News> findByQuery(String query, Pageable pageable);
2.在NewServie中添加搜索接口并在Impl中实现:
接口:
//全局搜索
Page<News> listNew(String query,Pageable pageable);
实现:
@Override
public Page<News> listNew(String query, Pageable pageable) {
return newRepository.findByQuery(query,pageable);
}
3.在IndexController中写上搜索管理:
@PostMapping("/search")
public String search(@PageableDefault(size = 3,sort = {
"updateTime"},direction = Sort.Direction.DESC)
Pageable pageable, @RequestParam String query,Model model){
model.addAttribute("page",newService.listNew("%"+query+"%",pageable));
model.addAttribute("query",query);
return "search";
}
至此,搜索功能完成
public class MarkdownUtils {
/**
* markdown格式转换成HTML格式
* @param markdown
* @return
*/
public static String markdownToHtml(String markdown) {
Parser parser = Parser.builder().build();
Node document = parser.parse(markdown);
HtmlRenderer renderer = HtmlRenderer.builder().build();
return renderer.render(document);
}
/**
* 增加扩展[标题锚点,表格生成]
* Markdown转换成HTML
* @param markdown
* @return
*/
public static String markdownToHtmlExtensions(String markdown) {
//h标题生成id
Set<Extension> headingAnchorExtensions = Collections.singleton(HeadingAnchorExtension.create());
//转换table的HTML
List<Extension> tableExtension = Arrays.asList(TablesExtension.create());
Parser parser = Parser.builder()
.extensions(tableExtension)
.build();
Node document = parser.parse(markdown);
HtmlRenderer renderer = HtmlRenderer.builder()
.extensions(headingAnchorExtensions)
.extensions(tableExtension)
.attributeProviderFactory(new AttributeProviderFactory() {
public AttributeProvider create(AttributeProviderContext context) {
return new CustomAttributeProvider();
}
})
.build();
return renderer.render(document);
}
/**
* 处理标签的属性
*/
static class CustomAttributeProvider implements AttributeProvider {
@Override
public void setAttributes(Node node, String tagName, Map<String, String> attributes) {
//改变a标签的target属性为_blank
if (node instanceof Link) {
attributes.put("target", "_blank");
}
if (node instanceof TableBlock) {
attributes.put("class", "ui celled table");
}
}
}
public static void main(String[] args) {
String table = "| hello | hi | 哈哈哈 |\n" +
"| ----- | ---- | ----- |\n" +
"| 斯维尔多 | 士大夫 | f啊 |\n" +
"| 阿什顿发 | 非固定杆 | 撒阿什顿发 |\n" +
"\n";
String a = "[imCoding 爱编程](http://www.lirenmi.cn)";
System.out.println(markdownToHtmlExtensions(a));
}
}
1.在NewServie中添加接口并在Impl中实现(通过新闻Id获取新闻,并去除格式符号):
接口:
News getAndConvert(Long id);
实现:
@Override
public News getAndConvert(Long id) {
News news = newRepository.findById(id).orElse(null);
if(news==null){
System.out.println("该新闻不存在");
}
News news1 = new News();
BeanUtils.copyProperties(news,news1);
String content = news1.getContent();
news1.setContent(MarkdownUtils.markdownToHtmlExtensions(content));
return news1;
}
2.在IndexController类中写上管理:
@RequestMapping("/news/{id}")
public String news(@PathVariable Long id,Model model){
model.addAttribute("news",newService.getAndConvert(id));
return "new";
}