springboot图书案例

package com.example.controller; import com.example.entity.Book; import com.example.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/books") public class BookController { @Autowired private BookService service; @PostMapping public Result save(@RequestBody Book book) { boolean flag = service.save(book); return new Result(flag ? Code.SAVE_OK:Code.SAVE_ERR,flag); } @PutMapping public Result update(@RequestBody Book book) { boolean flag = service.update(book); return new Result(flag ? Code.UPDATE_OK:Code.UPDATE_ERR,flag); } @DeleteMapping("/{id}") public Result delete(@PathVariable Integer id) { boolean flag = service.delete(id); return new Result(flag ? Code.DELETE_OK:Code.UPDATE_ERR,flag); } @GetMapping("/{id}") public Result getById(@PathVariable Integer id) { Book book =service.getById(id); Integer code = book!=null ? Code.GET_OK : Code.GET_ERR; String msg = book!=null ? "" : "数据查询失败"; return new Result(code,book,msg); } @GetMapping public Result getAll() { List<Book> booklist =service.getAll(); Integer code = booklist!=null ? Code.GET_OK : Code.GET_ERR; String msg = booklist!=null ? "" : "数据查询失败"; return new Result(code,booklist,msg); } }