关于Spring Boot对jdbc的支持问题

pom.xml

pom.xml：

<?xml version='1.0' encoding='UTF-8'?><project xmlns='http://maven.apache.org/POM/4.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'> <parent><artifactId>spring-boot-02</artifactId><groupId>com.keafmd</groupId><version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>spring-boot-08</artifactId> <dependencies><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><!-- 解析jsp类库 --><dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId></dependency><dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version></dependency><!-- JDBC-启动器, 默认的数据源 HikariCP --><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId></dependency><!-- JDBC-启动器, 默认的数据源 HikariCP --><dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId></dependency> </dependencies></project>

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;/** * Keafmd * * @ClassName: App08 * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 11:48 * @Blog: https://keafmd.blog.csdn.net/ */@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;/** * Keafmd * * @ClassName: UserDao * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 11:47 * @Blog: https://keafmd.blog.csdn.net/ */@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;/** * Keafmd * * @ClassName: IUserService * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 11:59 * @Blog: https://keafmd.blog.csdn.net/ */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;/** * Keafmd * * @ClassName: UserServiceImpl * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 12:00 * @Blog: https://keafmd.blog.csdn.net/ */@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;/** * Keafmd * * @ClassName: UserController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 18:04 * @Blog: https://keafmd.blog.csdn.net/ */@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);} }}

运行test方法的效果：

运行启动类，测试效果

运行启动类，访问：http://127.0.0.1/userlist

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