Spring Data JPA综合练习

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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 = "/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 = "/{id}")
    public String getBook(@PathVariable Integer id, ModelMap map) {
        map.addAttribute("book", bookService.get(id));
        return BOOK_DETAIL_PATH_NAME;
    }

    }

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Spring Data JPA练习 


    

        

            


                
                

                    

                    

                    
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