基于springboot写一个图书管理系统，附上源代码

很高兴能为您提供帮助，以下是一个基于Spring Boot框架开发的简单图书管理系统的源代码：

//Book.java
package com.example.demo.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    private String title;
    private String author;
    private String publisher;
    private int publishYear;

    public Book() {
    }

    public Book(String title, String author, String publisher, int publishYear) {
        this.title = title;
        this.author = author;
        this.publisher = publisher;
        this.publishYear = publishYear;
    }

    public int getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public int getPublishYear() {
        return publishYear;
    }

    public void setPublishYear(int publishYear) {
        this.publishYear = publishYear;
    }
}

//BookRepository.java
package com.example.demo.repository;

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

public interface BookRepository extends JpaRepository<Book, Integer> {
}

//BookService.java
package com.example.demo.service;

import com.example.demo.entity.Book;
import com.example.demo.repository.BookRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookService {
    @Autowired
    private BookRepository bookRepository;

    public List<Book> getAllBooks() {
        return bookRepository.findAll();
    }

    public Book getBookById(int id) {
        return bookRepository.findById(id).orElse(null);
    }

    public void addBook(Book book) {
        bookRepository.save(book);
    }

    public void updateBook(Book book) {
        bookRepository.save(book);
    }

    public void deleteBook(int id) {
        bookRepository.deleteById(id);
    }
}

//BookController.java
package com.example.demo.controller;

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

import java.util.List;

@RestController
@RequestMapping("/api/books")
public class BookController {
    @Autowired
    private BookService bookService;

    @GetMapping("")
    public List<Book> getAllBooks() {
        return bookService.getAllBooks();
    }

    @GetMapping("/{id}")
    public Book getBookById(@PathVariable int id) {
        return bookService.getBookById(id);
    }

    @PostMapping("")
    public void addBook(@RequestBody Book book) {
        bookService.addBook(book);
    }

    @PutMapping("/{id}")
    public void updateBook(@PathVariable int id, @RequestBody Book book) {
        book.setId(id);
        bookService.updateBook(book);
    }

    @DeleteMapping("/{id}")
    public void deleteBook(@PathVariable int id) {
        bookService.deleteBook(id);
    }
}

//DemoApplication.java
package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

此图书管理系统使用了Spring Boot框架和JPA，提供了基本的增删改查功能。您可以根据自己的需求进行修改和扩展。