会展中心网站建设,家装设计师收费标准,中国建设平台官网,广州安全教育平台入口登录官网//1.配置项目环境#xff0c;创建Spring Boot项目。 //2.数据库设置#xff0c;配置数据库。 //3.创建实体类#xff0c;映射到数据库。 //4.创建数据处理层类#xff0c;Repository //5.创建业务处理类#xff0c;Service类 //6.创建控制器类#xff0c;Controller类 Ar…//1.配置项目环境创建Spring Boot项目。 //2.数据库设置配置数据库。 //3.创建实体类映射到数据库。 //4.创建数据处理层类Repository //5.创建业务处理类Service类 //6.创建控制器类Controller类 Article.java java import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; Entity public class Article{ Id GeneratedValue(strategy GenerationType.AOTU) private Long id; private String title; private String content; private String author; //省略构造函数、getter和setter方法 //省略toString方法 //一个实体类完成了 } ArticleRepository.java数据访问层类 java import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.Query; import java.util.List; public interface ArticleRepository extends JpaRepositoryArticle,Long{ //可以在此自定义查询方法 //根据作者名查询文章 ListArticle findByAuthor(String author); //根据标题和作者查询文章 ListArticle findByTitleAndAuthor(String title,String author); //使用JPQL查询语句查询文章 Query(Select a FROM Article a WHERE a.title LIKE %:keyword% OR a.content LIKE %:keyword%) ListArticle fintByKeyword(String keyword); } ArticleService.Java(业务逻辑层) java import org.springframework.beans.factory. annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; import java.util.Optional; Service public class ArticleService{ private final ArticleRepository articleRepository; Autowired public ArticleService(ArticleRepository articleRepository){ this.articleRepository articleRepository; } public ListArticlegetAllArticles(){ return articleRepository.findAll(); } public OptionalArticlegetArticleById(Long id){ return articleRepository.findByID(id); } public Article createArticle(Article article){ return articleRepository.save(article); } /** public void updateArticle(Long id, Article article) { OptionalArticle existingArticle articleRepository.findById(id); if (existingArticle.isPresent()) { Article updatedArticle existingArticle.get(); updatedArticle.setTitle(article.getTitle()); updatedArticle.setContent(article.getContent()); updatedArticle.setAuthor(article.getAuthor()); articleRepository.save(updatedArticle); } } **/ public void deleteArticle(Long id){ articleRepository.deleteById(id); } } ArticleController.java(控制器类) java import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; import java.util.Optional; RestContrller RequestMapping(/articles) public class ArticleController{ private final ArticleService articleService; Autowired public ArticleControler( ArticleService articleService ){ tihs.articleService articleService; } GetMapping public ResponseEntityListArticlegetAllArticles(){ ListArticlearticles articleService.getAllArticles; return new ResponseEntity(articles,HttpStatus.OK) } //以下为粘贴 GetMapping(/{id}) public ResponseEntityArticle getArticleById(PathVariable Long id) { OptionalArticle article articleService.getArticleById(id); return article.map(value - new ResponseEntity(value, HttpStatus.OK)) .orElseGet(() - new ResponseEntity(HttpStatus.NOT_FOUND)); } PostMapping public ResponseEntityArticle createArticle(RequestBody Article article) { Article createdArticle articleService.createArticle(article); return new ResponseEntity(createdArticle, HttpStatus.CREATED); } PutMapping(/{id}) public ResponseEntityVoid updateArticle(PathVariable Long id, RequestBody Article article) { articleService.updateArticle(id, article); return new ResponseEntity(HttpStatus.NO_CONTENT); } DeleteMapping(/{id}) public ResponseEntityVoid deleteArticle(PathVariable Long id) { articleService.deleteArticle(id); return new ResponseEntity(HttpStatus.NO_CONTENT); } } }
