版本

Spring Boot 3.2.5

第一步，添加必要依赖

// mysql jdbc 及 驱动
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope>
</dependency>

pom.xml完整代码（包含其它依赖）：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.2.5</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>demo</description><properties><java.version>17</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.0.3</version></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.postgresql</groupId><artifactId>postgresql</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter-test</artifactId><version>3.0.3</version><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin></plugins></build></project>

第二步，yml配置数据库连接

server:port: 8079spring:application:name: demo# 数据库连接datasource:url: jdbc:mysql://127.0.0.1:3306/arrow_smart_toilet_database?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTCusername: rootpassword: rootdriver-class-name: com.mysql.cj.jdbc.Driver

第三步，测试连接

demo项目结构：

User实体

package com.example.demo.entity;import lombok.Data;@Data
public class User {private Long id;private String name;private Integer age;private String email;
}

controller代码：

package com.example.demo.controller;import com.example.demo.entity.User;
import com.example.demo.service.TService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
@RequestMapping("/t")
public class T {@Autowiredprivate TService tService;@GetMapping("/getUser")public List<User> getUserList() {return tService.getUsers();}
}

service层代码：

# TService 文件里的代码
package com.example.demo.service;import com.example.demo.entity.User;import java.util.List;public interface TService {List<User> getUsers();
}

TServiceImpl 实现：

# TServiceImpl 文件里的代码实现
package com.example.demo.service.impl;import com.example.demo.entity.User;
import com.example.demo.service.TService;
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import javax.sql.DataSource;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;@Service
public class TServiceImpl implements TService {@Autowiredprivate DataSource dataSource;@Overridepublic List<User> getUsers() {try (Connection connection = dataSource.getConnection()){System.out.println("数据库连接成功！");} catch (Exception e) {System.out.println(e.getMessage());e.printStackTrace();}return List.of();}
}

访问API：


连接成功！希望对你有帮助！