springboot jdbc链接数据库

<!-- Spring Boot JDBC -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- MYSQL -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

spring.datasource.url=jdbc:mysql://localhost:3306/ncdg
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

import java.io.Serializable;

/**
*
* @author lili
*/
public class User implements Serializable{
private int  id;
private String username;
private String position;
private String account;
private String userImg;

//这里省略了getter，setter
}

import com.mycompany.springbootdemo.dao.User;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;

/**
*
* @author lili
*/
@Service
public class UserService {

@Autowired
private JdbcTemplate jdbcTemplate;

public List<User> getList() {
String sql = "SELECT id,username,position,account, userImg   FROM ncdg_user";
return (List<User>) jdbcTemplate.query(sql, new RowMapper<User>() {

@Override
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User stu = new User();
stu.setId(rs.getInt("id"));
stu.setUsername(rs.getString("username"));
stu.setPosition(rs.getString("position"));
stu.setAccount(rs.getString("account"));
stu.setUserImg(rs.getString("userImg"));
return stu;
}
});
}
}

import com.mycompany.springbootdemo.dao.User;
import com.mycompany.springbootdemo.serverImpl.UserService;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
*
* @author lili
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService UserService;

@RequestMapping("/list")
public List<User> getStus(){
return UserService.getList();
}
}

[{"id":1,"username":"demo","position":"demo","account":"modede","userImg":null}]