Vue Cli3+SpringBoot踩坑历程（3）补充后端代码

为了让自己更好记住后端，在这里贴一下后端的评论操作和文章操作的相关代码；

pojo包

Book类

package com.example.demo.pojo;


import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import javax.persistence.*;

@Entity
@Table(name = "book")
@JsonIgnoreProperties({"hander","hibernateLazyInitializer"})
public class Book {
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)

    int id;
    String textTitle;
    String textHeader;
    String textBody;
    String textFooter;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTextTitle() {
        return textTitle;
    }

    public void setTextTitle(String textTitle) {
        this.textTitle = textTitle;
    }

    public String getTextHeader() {
        return textHeader;
    }

    public void setTextHeader(String textHeader) {
        this.textHeader = textHeader;
    }

    public String getTextBody() {
        return textBody;
    }

    public void setTextBody(String textBody) {
        this.textBody = textBody;
    }

    public String getTextFooter() {
        return textFooter;
    }

    public void setTextFooter(String textFooter) {
        this.textFooter = textFooter;
    }
}

PingLun类

package com.example.demo.pojo;


import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import javax.persistence.*;

@Entity
@Table(name = "pinglun")
@JsonIgnoreProperties({"hander","hibernateLazyInitializer"})
public class PingLun {
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    int id;
    String about;
    int bookId;
    public int getBookId() {
        return bookId;
    }

    public void setBookId(int bookId) {
        this.bookId = bookId;
    }



    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getAbout() {
        return about;
    }

    public void setAbout(String about) {
        this.about = about;
    }


}

dao包

BookDAO类

package com.example.demo.dao;

import com.example.demo.pojo.Book;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;
//此层为对数据的基本处理层，用来编写直接对数据库进行操作的代码。
public interface BookDao extends JpaRepository<Book,Integer> {
    List<Book> findByTextTitle(String name);
    List<Book> findById(int id);
}

PingLunDAO类

package com.example.demo.dao;

import com.example.demo.pojo.PingLun;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface PingLunDAO extends JpaRepository<PingLun,Integer> {
        List<PingLun> findByBookId(int BookId);
}

service包

BookService类

package com.example.demo.service;

import com.example.demo.dao.BookDao;
import com.example.demo.pojo.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

//service层主要用于处理逻辑，是业务逻辑层。
@Service
public class BookService {
    @Autowired
    BookDao bookDao;
//    按标题查找表
    public List<Book> FindById(int num){
//        return bookDao.findByTextTitle("hello");
        return  bookDao.findById(num);
    }
//    获取数据库所有信息
    public List<Book> getAll(){
        return bookDao.findAll();
    }
//从前端获取数据加入数据库
    public Book addOrUpdate(Book book){
        return bookDao.save(book);
    }
//    从前端获取id删除信息
    public void deleteTable(int id){
        bookDao.deleteById(id);
    }
}

PingLunService类

package com.example.demo.service;



import com.example.demo.dao.PingLunDAO;
import com.example.demo.pojo.PingLun;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class PingLunService {
    @Autowired
    PingLunDAO pingLunDAO;

    public List<PingLun> findAll(int num){
        return pingLunDAO.findByBookId(num);
    }
    public PingLun add(PingLun pingLun){
        return pingLunDAO.save(pingLun);
    }
    public void  delecet(int num){
        pingLunDAO.deleteById(num);
    }
}

controller包

BookController类

package com.example.demo.controller;


import com.example.demo.pojo.Book;
import com.example.demo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.util.HtmlUtils;

import java.util.List;
//此层主要进行对页面的处理，包括跳转或者传参等等。
@RestController
public class BookController {
    @Autowired
    BookService bookService;
//按标题查找文章
//    跨域注解
    @CrossOrigin
    @PostMapping("/FindTitle")
    public List<Book> list(@RequestBody Book book) throws Exception {
        int num = book.getId();
        return bookService.FindById(num);
    }
//获取数据库所有信息
    @CrossOrigin
    @GetMapping("/FindAll")
    public List<Book> list_1() throws Exception{
        return  bookService.getAll();
    }

//    从前端获取数据添加到数据库
    @CrossOrigin
    @PostMapping("/AddOrUpdate")
    public Book addOrUpdate(@RequestBody Book book) throws Exception{
        bookService.addOrUpdate(book);
        return book;
    }
//    从前端获取数据删除数据库对应id的数据
    @CrossOrigin
    @PostMapping("/DeleteById")
    public void deleteTable(@RequestBody Book book) throws Exception{
        bookService.deleteTable(book.getId());
    }

}

PingLunController类

package com.example.demo.controller;

import com.example.demo.pojo.PingLun;
import com.example.demo.service.PingLunService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class PingLunController {
    @Autowired
    PingLunService pingLunService;

    @CrossOrigin
    @PostMapping(value = "/getPingLun")
    @ResponseBody
    public List<PingLun> findAll(@RequestBody PingLun pingLun) throws Exception{
        return pingLunService.findAll(pingLun.getBookId());
    }
    @CrossOrigin
    @PostMapping(value = "/addPingLun")
    @ResponseBody
    public PingLun Add(@RequestBody PingLun pingLun) throws Exception{
        return pingLunService.add(pingLun);
    }

    @CrossOrigin
    @PostMapping(value = "/delectPingLun")
    @ResponseBody
    public void delect(@RequestBody PingLun pingLun) throws Exception{
        pingLunService.delecet(pingLun.getId());
    }

}

如果有缘人能看到这，可以参考一下小白的写法。下面是我参考的博主
Springboot打包方法
Vue路由传参