backend03

TestController

package cn.lnfvc.controller;

import cn.lnfvc.pojo.Book;
import cn.lnfvc.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
public class TestController {
    @Autowired
    private BookService bookService;
    @RequestMapping("/")
    public Book loadBook() {
        Book book = new Book();
        book.setName("book1");
        return book;

    }

@RequestMapping("books")
    public ListfindAllBooks(){

        return bookService.findAllBooks();
    }
}

BookService

package cn.lnfvc.service;

import cn.lnfvc.pojo.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class BookService {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    public List findAllBooks() {
        jdbcTemplate.execute("insert into users(name)values('johnyu')");
        List books = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            Book book = new Book();
            book.setName("book" + i);
            books.add(book);
        }
        return books;

    }
}

application.yml

server:
  port: 81
spring:
  datasource:
    username: xxy
    password: 123
    url: jdbc:mysql://johnyu.cn:3306/test?useSSL=false
    driver-class-name: com.mysql.cj.jdbc.Driver

App.java

package cn.lnfvc;

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

@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class);
    }
}

backend03.png

backend03同.png