Java方向（SSM+SpringBoot）项目实训Day9-SpringBoot（新闻管理系统）新闻管理条件查询分页展示+新增＋编辑
Day9-SpringBoot（新闻管理系统）新闻管理条件查询分页展示+新增＋编辑
- 新闻管理条件查询分页展示
- 新增
- 编辑
Java方向（SSM+SpringBoot）项目实训
Day9（2020.7.29）
新闻管理条件查询分页展示
1.修改News实体类；
News中添加：
@ManyToMany(cascade = CascadeType.PERSIST) //级联
private List<Tag> tags = new ArrayList<>();
@Transient
private String tagIds;
private String description;
public List<Tag> getTags() {
return tags;
}
public void setTags(List<Tag> tags) {
this.tags = tags;
}
public String getTagIds() {
return tagIds;
}
public void setTagIds(String tagIds) {
this.tagIds = tagIds;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
2.news下创建新的vo包并创建NewQuery类；
NewQuery添加：
package com.roger0123.news.vo;
public class NewQuery {
private String title;
private Long typeId;
private boolean recommend;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Long getTypeId() {
return typeId;
}
public void setTypeId(Long typeId) {
this.typeId = typeId;
}
public boolean isRecommend() {
return recommend;
}
public void setRecommend(boolean recommend) {
this.recommend = recommend;
}
@Override
public String toString() {
return "NewQuery{" +
"title='" + title + '\'' +
", typeId=" + typeId +
", recommend=" + recommend +
'}';
}
}
3.dao下创建NewRepository接口；
NewRepository中添加：
package com.roger0123.news.dao;
import com.roger0123.news.po.News;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Query;
public interface NewRepository extends JpaRepository<News,Long>, JpaSpecificationExecutor<News> {
// @Query("select n from News n where n.title like ?1 or n.content like ?1")
// Page findByQuery(String query, Pageable pageable);
}
4.service下创建NewService接口；
NewServicer中添加：
package com.roger0123.news.service;
import com.roger0123.news.po.News;
import com.roger0123.news.vo.NewQuery;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
public interface NewService {
Page<News> listNew(Pageable pageable, NewQuery newQuery);
}
5.service.impl下创建NewServiceImpl类；
NewServiceImpl中添加：
@Service
public class NewServiceImpl implements NewService {
@Autowired
private NewRepository newRepository;
//新闻管理中的列表（包含了查询）
@Override //查询构造器，多条件组合
public Page<News> listNew(Pageable pageable, NewQuery newQuery) {
return newRepository.findAll(new Specification<News>() {
@Override
public Predicate toPredicate(Root<News> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
List<Predicate> predicates = new ArrayList<>();
if (!"".equals(newQuery.getTitle())&&newQuery.getTitle()!=null){
predicates.add(cb.like(root.<String>get("title"),"%"+newQuery.getTitle()+"%"));
}
if (newQuery.getTypeId()!=null){
predicates.add(cb.equal(root.get("type").get("id"),newQuery.getTypeId()));
}
if (newQuery.isRecommend()){
predicates.add(cb.equal(root.get("recommend"),newQuery.isRecommend()));
}
cq.where(predicates.toArray(new Predicate[predicates.size()]));
return null;
}
},pageable);
}
}
6.controller下创建NewControllerr类；
NewController中添加：
@Controller
@RequestMapping("/admin")
public class NewController {
private static final String INPUT = "admin/news-input";
private static final String List = "admin/news";
private static final String REDIRECT_LIST = "redirect:/admin/news";
@Autowired
private NewService newService;
@Autowired
private TypeService typeService;
@Autowired
private TagService tagService;
@GetMapping("/news")
public String news(@PageableDefault(size = 3,sort = {
"updateTime"},direction = Sort.Direction.DESC)
Pageable pageable, NewQuery newQuery, Model model){
model.addAttribute("types",typeService.listType());
model.addAttribute("page",newService.listNew(pageable,newQuery));
System.out.println(model);
return List;
}
@PostMapping("/news/search")
public String search(@PageableDefault(size = 3,sort = {
"updateTime"},direction = Sort.Direction.DESC)
Pageable pageable,NewQuery newQuery,Model model) {
model.addAttribute("page",newService.listNew(pageable,newQuery));
System.out.println(newService.listNew(pageable,newQuery));
return "admin/news :: newsList";
}
}
新增
1.修改Tag实体类；
Tag中添加：
@ManyToMany(mappedBy = "tags")
private List<News> newsList = new ArrayList<>();
2.修改TagService接口；
TagService中添加：
List<Tag> listTag();
List<Tag> listTag(String ids);
3.修改TagServiceImpl实体类；
TagServiceImpl中添加：
@Override
public List<Tag> listTag() {
return tagRepository.findAll();
}
@Override
public List<Tag> listTag(String ids) {
return tagRepository.findAllById(convertToList(ids));
}
private List<Long> convertToList(String ids){
System.out.println("service接收ids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中处理完成的id list"+list);
return list;
}
4.修改TypeService接口；
TypeService中添加：
List<Type> listType();
5.修改TypeServiceImpl实体类；
TypeServiceImpl中添加：
@Override
public List<Type> listType() {
return typeRepository.findAll();
}
6.修改NewService接口；
NewServicer中添加：
News saveNew(News news);
7.修改NewServiceImpl类；
NewServiceImpl中添加：
@Override
public News saveNew(News news) {
if (news.getId()==null){
news.setCreateTime(new Date());
news.setUpdateTime(new Date());
}
return newRepository.save(news);
}
8.修改NewControllerr类；
NewController中添加：
public void setTypeAndTag(Model model){
model.addAttribute("types",typeService.listType());
model.addAttribute("tags",tagService.listTag());
}
@GetMapping("/news/input")
public String input(Model model){
setTypeAndTag(model);
model.addAttribute("news",new News());
return INPUT;
}
@PostMapping("/news/add")
public String post(News news, RedirectAttributes attributes, HttpSession session){
System.out.println("controller接收的news为:"+news);
news.setUser((User) session.getAttribute("user"));
news.setType(typeService.getType(news.getType().getId()));
news.setTags(tagService.listTag(news.getTagIds()));
News news1;
if (news.getId()==null){
news1 = newService.saveNew(news);
}else {
news1 = newService.updateNew(news.getId(),news);
}
if (news1 == null){
attributes.addFlashAttribute("message","操作失败");
}else {
attributes.addFlashAttribute("message","操作成功");
}
return REDIRECT_LIST;
}
编辑
1.修改NewService接口；
NewServicer中添加：
News getNew(Long id);
News updateNew(Long id,News news);
2.修改NewServiceImpl类；
NewServiceImpl中添加：
@Override
public News getNew(Long id) {
return newRepository.findById(id).orElse(null);
}
@Override
public News updateNew(Long id, News news) {
News news1 = newRepository.findById(id).orElse(null);
if (news1==null){
System.out.println("未获得更新对象");
}
BeanUtils.copyProperties(news,news1);
news1.setUpdateTime(new Date());
return newRepository.save(news1);
}
3.修改NewControllerr类；
NewController中添加：
@GetMapping("/news/{id}/toUpdate")
public String toUpdate(@PathVariable Long id, Model model){
setTypeAndTag(model);
News news = newService.getNew(id);
news.init();
model.addAttribute("news",news);
return INPUT;
}
Test
1.登陆成功后进入新闻管理界面；
2.点击新增，进入新闻添加界面，编辑好后点击保存；
保存为草稿，为未发布状态；
点击编辑，进入新闻编辑界面；
作出部分修改后，点击发布进行新闻更新操作；
重新编辑几条新闻，验证查询以及分页展示；
1.标题名称模糊搜索；
2.分类搜索；
3.是否推荐搜索；
4.多条件排列组合搜索；
