中软国际实训八：SpringBoot项目——主页信息展示+详情页

1.项目结构更新

2.新闻首页与详情页

2.1 更新方法类与实现

NewService

//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);

//全局搜索
Page<News> listNew(String query,Pageable pageable);

News getAndConvert(Long id);

NewServiceImpl

@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);
}

@Override
public Page<News> listNew(String query, Pageable pageable) {
return newRepository.findByQuery(query,pageable);
}

@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;
}

TagService

List<Tag> listTag(String ids);

List<Tag> listTagTop(Integer size);

TagServiceImpl

@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);
}

private List<Long> convertToList(String ids){
System.out.println("service接收的ida为："+ids);
List<Long> list = new ArrayList<>();
if (!"".equals(ids) && ids!=null){
String[] idArray = ids.split(",");
for (int i=0;i<idArray.length;i++){
list.add(new Long(idArray[i]));
}
}
System.out.println("service中处理完成后的id list"+list);
return list;
}

TypeService

List<Type> listTypeTop(Integer size);

TypeServiceImpl

@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);

2.2 添加工具类

util.MarkdownUtils

package com.zr0726.news.util;

import org.commonmark.Extension;
import org.commonmark.ext.gfm.tables.TableBlock;
import org.commonmark.ext.gfm.tables.TablesExtension;
import org.commonmark.ext.heading.anchor.HeadingAnchorExtension;
import org.commonmark.node.Link;
import org.commonmark.node.Node;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.AttributeProvider;
import org.commonmark.renderer.html.AttributeProviderContext;
import org.commonmark.renderer.html.AttributeProviderFactory;
import org.commonmark.renderer.html.HtmlRenderer;

import java.util.*;

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));
}

}

2.3 新闻页控制类

IndexController

package com.zr0726.news.web;

import com.zr0726.news.service.NewService;
import com.zr0726.news.service.TagService;
import com.zr0726.news.service.TypeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.web.PageableDefault;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

@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";
}

@PostMapping("/search")
public String search(@PageableDefault(size = 3,sort = {"update"},direction = Sort.Direction.DESC)
Pageable pageable,@RequestParam String query,Model model){
model.addAttribute("page",newService.listNew("%"+query+"%",pageable));
model.addAttribute("query",query);
return "search";
}

@RequestMapping("/news/{id}")
public String news(@PathVariable Long id,Model model){
model.addAttribute("news",newService.getAndConvert(id));
return "new";
}
}

3. 功能测试