SpringBoot对jdbc的支持问题如何解决

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pom.xml：

            spring-boot-02        com.keafmd        1.0-SNAPSHOT        4.0.0    spring-boot-08                        org.springframework.boot            spring-boot-starter-web                                    org.apache.tomcat.embed            tomcat-embed-jasper                            jstl            jstl            1.2                                    org.springframework.boot            spring-boot-starter-jdbc                                    mysql            mysql-connector-java            5.1.46                            org.springframework.boot            spring-boot-starter-test                            org.springframework.boot            spring-boot-devtools            

application.yml

server:  port: 80spring:  datasource:    url: jdbc:mysql://127.0.0.1:3306/ssm-java1?useSSL=false    driver-class-name: com.mysql.jdbc.Driver    username: root    password: 18044229

启动类

package com.keafmd;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class App08 {    public static void main(String[] args) {        SpringApplication.run(App08.class, args);    }}

Dao层

UserDao：

package com.keafmd.dao;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.stereotype.Repository;import java.util.List;@Repositorypublic class UserDao {    @Autowired    JdbcTemplate jdbcTemplate;    public List userList(){        String sql ="select * from user";        return jdbcTemplate.queryForList(sql);    }}

Service层

IUserService ：

package com.keafmd.service;import java.util.List;public interface IUserService {    List list();}

UserServiceImpl：

package com.keafmd.service.impl;import com.keafmd.dao.UserDao;import com.keafmd.service.IUserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class UserServiceImpl implements IUserService {    @Autowired    UserDao userDao;    @Override    public List list() {        return userDao.userList();    }}

Controller层

UserController：

package com.keafmd.controller;import com.keafmd.service.IUserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestControllerpublic class UserController {    @Autowired    IUserService userService;    /**     * http://127.0.0.1/userlist     * @return     */    @RequestMapping("userlist")    List UserList(){        return userService.list();    }}

测试类测试

UserDaoTest：

package com.keafmd.dao;import com.keafmd.App08;import org.junit.jupiter.api.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import java.util.List;import static org.junit.jupiter.api.Assertions.*;@SpringBootTest(classes = App08.class)class UserDaoTest {    @Autowired    UserDao userDao;    @Test    public void test(){        List userlist = userDao.userList();        for (Object o : userlist) {            System.out.println(o);        }    }}

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