简介：

此项目是一个前后端分离的小demo,

开发工具：idea+微信小程序开发工具

前端：界面布局样式和js的跳转

后端：依靠SpringBoot的业务逻辑层

项目的码云地址：

https://gitee.com/zhege/WebChatDemoJava

微信开发工具的使用和代码的结构及其含义参考

https://developers.weixin.qq.com/miniprogram/dev/

后端业务逻辑的完成

1.数据库的创建

工具：Navicat

小程序

2. dao层及其方法的实现

1bookinfo的实例化，利用@Entity完成映射

@Entity@Table(name = "bookinfo")public class BookinfoEntity {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    private int bookId;    @Column    private String bookType;    @Column    private String bookName;    @Column    private int bookNum;    @Column    private int bookState;    public int getBookId() {        return bookId;    }    public void setBookId(int bookId) {        this.bookId = bookId;    }    public String getBookType() {        return bookType;    }    public void setBookType(String bookType) {        this.bookType = bookType;    }    public String getBookName() {        return bookName;    }    public void setBookName(String bookName) {        this.bookName = bookName;    }    public int getBookNum() {        return bookNum;    }    public void setBookNum(int bookNum) {        this.bookNum = bookNum;    }    public int getBookState() {        return bookState;    }    public void setBookState(int bookState) {        this.bookState = bookState;    }}

bookinfoentity

2bookstate的实例化

@Entity@Table(name = "bookstate")public class BookstateEntity {    @Id    private int bookState;    @Column    private String bookStateinfo;    public int getBookState() {        return bookState;    }    public void setBookState(int bookState) {        this.bookState = bookState;    }    public String getBookStateinfo() {        return bookStateinfo;    }    public void setBookStateinfo(String bookStateinfo) {        this.bookStateinfo = bookStateinfo;    }}

bookstateEntity

3利用repository实现对对象的持久化操作，是OO的真正实现

@Repositorypublic interface BookInfoRepository extends JpaRepositoryBookinfoEntity,Integer {}

@Repositorypublic interface BookstateRepository extends JpaRepositoryBookstateEntity,Integer {}

3.service层的实现、

3.1 BookinfoService接口

package com.example.demo.service;import com.example.demo.vo.BookinfoVo;import java.util.List;/** * Author: wuhen * Date: 2018/10/9 * Time: 20:40 */public interface BookinfoService {    //查询书籍    BookinfoVo findbookOne(Integer bookId);    //查询所有书籍   ListBookinfoVo findbookAll();}

BookinfoService

3.2 接口的实现

package com.example.demo.service.impl;import com.example.demo.entity.BookinfoEntity;import com.example.demo.entity.BookstateEntity;import com.example.demo.repository.BookinfoRepository;import com.example.demo.repository.BookstateRepository;import com.example.demo.service.BookinfoService;import com.example.demo.util.BookConverter;import com.example.demo.vo.BookinfoVo;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.ArrayList;import java.util.List;/** * Author: wuhen * Date: 2018/10/9 * Time: 20:48 */@Servicepublic class BookinfoServiceImpl implements BookinfoService {    @Autowired    private BookinfoRepository bookinfoRepository;    @Autowired    private BookstateRepository bookstateRepository;    BookConverter bookConverter=new BookConverter();    @Override    public BookinfoVo findbookOne(Integer bookId) {        BookinfoEntity bookinfoEntity= bookinfoRepository.findById(bookId).get();        BookstateEntity bookstateEntity = bookstateRepository.findById(bookinfoEntity.getBookState()).get();        BookinfoVo bookinfoVo;        bookinfoVo = bookConverter.convert(bookinfoEntity, BookinfoVo.class);        bookinfoVo.setBookStateinfo(bookstateEntity.getBookStateinfo());        return bookinfoVo;    }    @Override    public ListBookinfoVo findbookAll() {        ListBookinfoEntity bookinfoEntitys=bookinfoRepository.findAll();        ListBookinfoVo bookinfoVos=new ArrayList();        for (BookinfoEntity bookinfoEntity:bookinfoEntitys)        {            BookinfoVo bookinfoVo;            BookstateEntity bookstateEntity= bookstateRepository.findById(bookinfoEntity.getBookState()).get();            bookinfoVo=bookConverter.convert(bookinfoEntity,BookinfoVo.class);            bookinfoVo.setBookStateinfo(bookstateEntity.getBookStateinfo());            bookinfoVos.add(bookinfoVo);        }       return bookinfoVos;    }}

BookinfoServiceImpl

4. controller层的实现

package com.example.demo.controller;import com.example.demo.service.BookinfoService;import com.example.demo.util.ResultVOUtil;import com.example.demo.vo.BookinfoVo;import com.example.demo.vo.ResultVO;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import java.util.List;/** * Author: wuhen * Date: 2018/10/9 * Time: 20:55 */@RestController@RequestMapping("/book")public class BookinfoController {    @Autowired    private BookinfoService bookinfoService;    //查询单个    @GetMapping("/findOne")    public ResultVOBookinfoVo findbookOne(@RequestParam(value = "bookId") Integer bookId){               BookinfoVo bookinfoVo= bookinfoService.findbookOne(bookId);               return ResultVOUtil.success(bookinfoVo);    }    //查询所有    @GetMapping("/findAll") public ResultVOBookinfoVo findbookAll(){       List BookinfoVo bookinfoVo= bookinfoService.findbookAll();       return ResultVOUtil.success(bookinfoVo);   }}

BookinfoController

5. 请求返回json数据

{    "code": 0,    "msg": "成功",    "data": [        {            "bookId": 1,            "bookType": "数学",            "bookName": "大数宣讲",            "bookNum": 20,            "bookStateinfo": "在架"        },        {            "bookId": 2,            "bookType": "语文",            "bookName": "国语",            "bookNum": 30,            "bookStateinfo": "在架"        },        {            "bookId": 3,            "bookType": "英语",            "bookName": "四六级",            "bookNum": 45,            "bookStateinfo": "在架"        },        {            "bookId": 4,            "bookType": "科技",            "bookName": "天眼",            "bookNum": 12,            "bookStateinfo": "在架"        }    ]}

{    "code": 0,    "msg": "成功",    "data": {        "bookId": 2,        "bookType": "语文",        "bookName": "国语",        "bookNum": 30,        "bookStateinfo": "在架"    }}