springboot jdbc連接數據庫

1.若是是maven 構建的項目 先加入pom.xml配置文件

 <!-- 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>

2.在application.properties寫入配置文件

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

3.新建user.java

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;

  //這裏省略了getter，setter
}

4.建一個UserService.java

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;
            }
        });
    }
}

5.新建一個UserController.java

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();
    }
}

 

6.啓動springBoot 訪問 http://localhost:8080/user/list

就獲得數據

 

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