pom引入以下依赖

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
             <version>1.2.3</version>
        </dependency>
<!-- mysql8以下版本用这个-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
<!--        mysql8版本用这个-->
<!--        <dependency>-->
<!--            <groupId>mysql</groupId>-->
<!--            <artifactId>mysql-connector-java</artifactId>-->
<!--            <version>8.0.11</version>-->
<!--        </dependency>-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.1.RELEASE</version>
 </dependency>
     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
</dependency>

application.properties添加数据库配置

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/wangshengdb??characterEncoding=UTF-8&useUnicode=true&useSSL=false&tinyInt1isBit=false&allowPublicKeyRetrieval=true&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=wangsheng

 创建JdbcTemplate工具类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
/**
 * 创 建 人 ： wangsheng 创建日期：2019年10月9日
 */
@Service
public class JDBC {

    @Autowired
    JdbcTemplate jdbcTemplate;

    //增加修改删除都用这个
    public void insertUpdate(String sql, Object[] obj) {
        jdbcTemplate.update(sql, obj);
    }

    //查询返回对象集合
    public <T> List selectListPojo(String sql, Class<T> t, Object[] obj) {
        List<Object> list = jdbcTemplate.query(sql, obj, (RowMapper<Object>) new BeanPropertyRowMapper<T>(t));
        return (List) list;

    }

    //查询返回对象
    public <T> T selectpojo(String sql, Class<T> t, Object[] obj) throws ClassNotFoundException {
        Object object = jdbcTemplate.queryForObject(sql, obj, new BeanPropertyRowMapper<T>(t));
        return (T) object;
    }

    //查询返回List<Map<String, Object>>
    public <T> List<Map<String, Object>> selectListMap(String sql, Object[] obj) {
        List<Map<String, Object>> list = jdbcTemplate.queryForList(sql, obj);
        return (List) list;
    }

    //查询返回integer
    public int selectInteger(String sql, Object[] obj) {
        return jdbcTemplate.queryForObject(sql, Integer.class, obj);
    }

    //查询返回String
    public String selectString(String sql, Object[] obj) {
        return jdbcTemplate.queryForObject(sql, String.class, obj);
    }

    //查询返回List< String>
    public <T> List selectListString(String sql, Object[] obj) {
        List<String> list = jdbcTemplate.queryForList(sql, String.class, obj);
        return (List) list;
    }

    //查询返回List< Integer>
    public <T> List selectListObject(String sql, Object[] obj) {
        List<Integer> list = jdbcTemplate.queryForList(sql, Integer.class, obj);
        return (List) list;
    }

}

创建实体类

/**
 * 创 建 人 ： wangsheng 创建日期：2019年10月9日
 */
public class Score {
    public Integer id;
    public String smart_card;
    public Integer score;

    public Integer getId() {
        return id;
    }

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

    public String getSmart_card() {
        return smart_card;
    }

    public void setSmart_card(String smart_card) {
        this.smart_card = smart_card;
    }

    public Integer getScore() {
        return score;
    }

    public void setScore(Integer score) {
        this.score = score;
    }
}

测试

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;
import java.util.Map;
/**
 * 创 建 人 ： wangsheng 创建日期：2019年10月9日
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class controller {
    @Autowired
    JDBC jdbc;
    
    @Test
    public void selectpojo() throws ClassNotFoundException {
        String sql = "select * from dtv_score where id =?";
        Object[] obj = new Object[]{1};
       score score = jdbc.selectpojo(sql, score.class,obj);
        System.out.println(score);
    }
    @Test
    public void selectListpojo() {
        String sql = "select * from dtv_score where id between  ? and ?";
        Object[] obj = new Object[]{1,4};
      List<score> list = jdbc.selectListPojo(sql,score.class,obj);
        System.out.println(list.get(0).getSmart_card());
    }
    @Test
    public void add() {
        String sql = "insert into dtv_score(smart_card,score) values(?,?)";
        Object[] obj = new Object[]{"safsad",10};
       jdbc.insertUpdate(sql,obj);

    }
    @Test
    public void selectListMap() {
        String sql = "select * from dtv_score where id between  ? and ?";
        Object[] obj = new Object[]{1, 4};
        List<Map<String, Object>> list = jdbc.selectListMap(sql, obj);
        Map<String, Object> map = list.get(0);
        System.out.println( list);
    }
}