Spring|Spring Data JPA综合练习 SpringDataJPA综合练习

选取京东图书展示页面编码

新建一个Book实体类

package com.example.entity; import lombok.Data; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; /** * Created by 史冬阳 on 2018/9/20. */ @Entity @Data public class Book { @Id @GeneratedValue private Integer id; private String avatar; private String name; private String author; private String price; private String introduction; }

新建一个DAO层

package com.example.dao; import com.example.entity.Book; import org.springframework.data.jpa.repository.JpaRepository; /** * Created by 史冬阳 on 2018/9/20. *//** * Integer 唯一标识符数据库的主键 */ public interface BookRepository extends JpaRepository { }

新建一个BookService接口

package com.example.service; import com.example.entity.Book; import java.util.List; /** * Created by 史冬阳 on 2018/9/20. */ public interface BookService { Book save(Book book); List getAll(); Book get(int id); void delete(int id); }

新建一个service层的实现类

package com.example.service.impl; import com.example.dao.BookRepository; import com.example.entity.Book; import com.example.service.BookService; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import javax.annotation.Resource; import java.util.List; /** * Created by 史冬阳 on 2018/9/20. */ @Service public class BookServiceImpl implements BookService { @Resource private BookRepository bookRepository; @Override @Transactional public Book save(Book book) { return bookRepository.save(book); }@Override public List getAll() { return bookRepository.findAll(); }@Override @Transactional public Book get(int id) { return bookRepository.findById(id).get(); }@Override @Transactional public void delete(int id) { bookRepository.deleteById(id); } }

新建一个test类

package com.example.service.impl; import com.example.entity.Book; import com.example.service.BookService; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import javax.annotation.Resource; import static org.junit.Assert.*; /** * Created by 史冬阳 on 2018/9/20. */ @RunWith(SpringRunner.class) @SpringBootTest public class BookServiceImplTest { @Resource private BookService bookService; @Test public void save() throws Exception { String[] names = {"独家记忆","余生多关照","绿物语","时光行者的你","林深时见鹿","单向迁徙"}; String[] authors = {"木浮生","原城","镰足","桐华","宴生","张饮修"}; String[] prices ={"23.8","24.3","26.2","28.5","20.6","33.6"}; String[] introductions = { "世界上最美好的事情莫过于，我喜欢你的同时，刚好你也喜欢我。", "喜欢制造大悲或大喜的故事，从事自己热爱的职业，结识自己喜爱的人。", "不要被植物表面的柔软和温顺欺骗，有时，一缕委婉涌动的洁白，数年后会引发无法挽救的巨大灾难。", "他说：“后来，我遇见了一个将我的世界点亮的人。他们都是时光里的伤心旅客，也是余生路上最好的旅伴。", "故事讲述了少年顾延树和少女鹿惜光幼年时曾相依相伴，却无奈被命运分离，从此分隔两地，各自在不同的环境中坚强而隐忍地长大，为了彼此成为更优秀的人。两人从此经历了重重磨难和考验，当年被迫分开的真相也渐渐浮出水面。", "突围黑暗过往的自我救赎之作。回忆给自己，童话给读者。也许某一天，你终会耗尽一切，但，爱我，本身就是一场单向迁徙。"}; String[] avatars = { "http://peojfj6k8.bkt.clouddn.com/1.jpg", "http://peojfj6k8.bkt.clouddn.com/2.jpg", "http://peojfj6k8.bkt.clouddn.com/3.jpg", "http://peojfj6k8.bkt.clouddn.com/4.jpg", "http://peojfj6k8.bkt.clouddn.com/5.jpg", "http://peojfj6k8.bkt.clouddn.com/6.jpg"}; for (int i=0; i<6; i++){ Book book = new Book(); book.setName(names[i]); book.setAuthor(authors[i]); book.setAvatar(avatars[i]); book.setPrice(prices[i]); book.setIntroduction(introductions[i]); System.out.println(bookService.save(book)); } }@Test public void getAll() throws Exception {}@Test public void get() throws Exception {}@Test public void delete() throws Exception {}}

新建一个Controller层

package com.example.controller; import com.example.service.BookService; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import javax.annotation.Resource; /** * Created by 史冬阳 on 2018/9/20. */ @Controller @RequestMapping(value = "https://www.it610.com/book") public class BookController { private static final String BOOK_DETAIL_PATH_NAME = "bookDetail"; private static final String BOOK_LIST_PATH_NAME = "bookList"; @Resource BookService bookService; /** * 获取 Book 列表 * 处理 "/book" 的 GET 请求，用来获取 Book 列表 * 数据存入ModelMap，返回Thymeleaf页面 */ @GetMapping() public String getBookList(ModelMap map) { map.addAttribute("bookList",bookService.getAll()); return BOOK_LIST_PATH_NAME; }/** * 获取 Book * 处理 "/book/{id}" 的 GET 请求 */@GetMapping(value = "https://www.it610.com/{id}") public String getBook(@PathVariable Integer id, ModelMap map) { map.addAttribute("book", bookService.get(id)); return BOOK_DETAIL_PATH_NAME; }}

图书列表页面

书籍列表 - 锐客网.top-set{ width: 1400px; margin-left: 56px; } .price-set{ color: #E3393C; font-size: 16px; } .name-set{ font-size: 14px; color: black; } .amount-set{ color: #649cd9; font-size: 14px; } .location-set{ font-size: 12px; } 文章图片 Spring Data JPA练习文章图片 7.2万+条评论