1.pom.xml中导入依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.46</version>
</dependency>

2.在Application.properties中指定连接池参数：

spring.datasource.url=jdbc:mysql:///springboot
spring.datasource.username=root
spring.datasource.password=123456

#以下参数可不设置
#spring.datasource.driverClassName=com.mysql.jdbc.Driver
#spring.datasource.hikari.idle-timeout=60000
#spring.datasource.hikari.maximum-pool-size=30
#spring.datasource.hikari.minimum-idle=10

3.编写实体类（属性和表字段对应，这里jdbc支持表字段带下划线时自动专为驼峰命名法的属性字段）：

package com.lxj.domain;

import java.util.Date;

public class User {
    private Integer id;
    private String userName;
    private String passWord;
    private String name;
    private Integer age;
    private Integer sex;
    private Date birthday;
    private Date created;
    private Date updated;
    private  String note;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public Date getUpdated() {
        return updated;
    }

    public void setUpdated(Date updated) {
        this.updated = updated;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", birthday=" + birthday +
                ", note='" + note + '\'' +
                '}';
    }
}

4.编写dao: 

package com.lxj.dao;

import com.lxj.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public class JdbcDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    public List<User> findAll(){

        //BeanPropertyRowMapper : 可以把同名字段赋值给属性
        return jdbcTemplate.query("select * from tb_user",new BeanPropertyRowMapper<>(User.class));
    }
}

@Repository注解便用于将数据访问层 (DAO 层 ) 的类标识为 Spring Bean。具体只需将该注解标注在 DAO类上即可。

5.写一个test类进行测试：

@RunWith(SpringRunner.class)
@SpringBootTest
public class JdbcDaoTest extends TestCase {

    @Autowired
    private JdbcDao jdbcDao;

    @Test
    public void findAll() {
        jdbcDao.findAll().forEach(user -> {
            System.out.println(user);
        });
    }
}

@RunWith(SpringRunner.class)的作用表明Test测试类要使用注入的类，比如@Autowired注入的类，有了@RunWith(SpringRunner.class)这些类才能实例化到spring容器中，自动注入才能生效。

@SpringBootTest替代了spring-test中的@ContextConfiguration注解，目的是加载ApplicationContext，启动spring容器。使用@SpringBootTest时并没有像@ContextConfiguration一样显示指定locations或classes属性，原因在于@SpringBootTest注解会自动检索程序的配置文件，检索顺序是从当前包开始，逐级向上查找被@SpringBootApplication或@SpringBootConfiguration注解的类。

在方法前加上 @Test ， 则该方法即为测试方法，可以执行。

6.打印结果：

表结构：