1.在项目的pom.xml中添加相关依赖

<!--jdbc-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
</dependency>
<!--数据库驱动-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.38</version>
</dependency>
<!--Druid-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.12</version>
</dependency>
2.配置数据源:
方法1:在resource下创建jdbc.properties文件 存储数据库的配置信息

jdbc.driver-class-name=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false

jdbc.password=xxxxxxx
jdbc.username=root
然后就是spring的基于注解配置数据源的那一套了
创建配置类

package com.mc_74120.springbootjdbc.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import javax.sql.DataSource;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

@Configuration
@PropertySource("classpath:jdbc.properties")
public class SpringjdbcConfig {
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.driver-class-name}")
    private String className;
    @Bean
    public DataSource getDataSource(){
        DruidDataSource dataSource=new DruidDataSource();
        dataSource.setDriverClassName(className);
        dataSource.setUrl(url);
        dataSource.setUsername(userName);
dataSource.setPassword(password);
return  dataSource;
    }
}
当springboot扫描到该配置类后 会将数据源加入容器
方法2:将

jdbc.driver-class-name=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false

jdbc.password=xxxxxxx
jdbc.username=root
写入application.properties文件中
并创建配置类：

package com.mc_74120.springbootjdbc.config;

import org.springframework.boot.context.properties.ConfigurationProperties;

//@ConfigurationProperties(prefix = "jdbc")
//是springboot的注解 不能读取其他配置文件 只能读取springboot的application配置文件
public class JbdcConfiguration {
    private String driver;
    private String url;
    private  String password;
    private String userName;

    public String getDriver() {
        return driver;
    }

    public String getUrl() {
        return url;
    }

    public String getPassword() {
        return password;
    }

    public String getUserName() {
        return userName;
    }

    public void setDriver(String driver) {
        this.driver = driver;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public void setPassword(String password) {
        this.password = password;
    }

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

import javax.print.DocFlavor;
import javax.sql.DataSource;

//@Configuration
//@EnableConfigurationProperties(JbdcConfiguration.class)//指定加载哪个配置信息属性类
public class JdbcConfig {
    @Bean
    public DataSource getDataSource(){
        DruidDataSource druidDataSource=new DruidDataSource();
        return druidDataSource;

    }
}
读取application.properties中前缀为：jdbc的属性 并把对应的值一一赋值给JbdcConfiguration中的变量(以jdbc为前缀的属性名 去掉jdbc的部分 必须与jdbcConfigration中的变量名一一对应 比如说 driver必须有jdbc.driver与其对应
 )
JdbcConfig类读取JbdcConfiguration中的值 并创建datasource

方法3:

//@Configuration

public class JdbcConfig {

//@ConfigurationProperties(prefix = "jdbc")

    @Bean
    public DataSource getDataSource(){
        DruidDataSource druidDataSource=new DruidDataSource();
        return druidDataSource;

    }
}
直接读取 application.perperties中以jdbc为前缀的值 并实例化 datasource
方法4:

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=xxxx
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
在application文件中直接配置datasource并加入容器

springboot整合jdbc(1)