一、引入依赖

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        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>6.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.22</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

二、多数据源配置

在Spring Boot配置文件application.yml中配置多数据源和Spring Boot JdbcTemplate配置Druid多数据源一致。
然后根据application.yml创建两个数据源配置类MysqlDatasourceConfig和OracleDatasourceConfig：
MysqlDatasourceConfig：

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@Configuration
@MapperScan(basePackages = MysqlDatasourceConfig.PACKAGE, sqlSessionFactoryRef = "mysqlSqlSessionFactory")
public class MysqlDatasourceConfig {

    // mysqldao扫描路径
    static final String PACKAGE = "com.wno704.boot.mysqldao";
    // mybatis mapper扫描路径
    static final String MAPPER_LOCATION = "classpath:mapper/mysql/*.xml";

    @Primary
    @Bean(name = "mysqldatasource")
    @ConfigurationProperties("spring.datasource.druid.mysql")
    public DataSource mysqlDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "mysqlTransactionManager")
    @Primary
    public DataSourceTransactionManager mysqlTransactionManager() {
        return new DataSourceTransactionManager(mysqlDataSource());
    }

    @Bean(name = "mysqlSqlSessionFactory")
    @Primary
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqldatasource") DataSource dataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(MysqlDatasourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

上面代码配置了一个名为mysqldatasource的数据源，对应application.yml中spring.datasource.druid.mysql前缀配置的数据库。然后创建了一个名为mysqlSqlSessionFactory的Bean，并且注入了mysqldatasource。与此同时，还分别定了两个扫描路径PACKAGE和MAPPER_LOCATION，前者为Mysql数据库对应的mapper接口地址，后者为对应的mapper xml文件路径。
@Primary标志这个Bean如果在多个同类Bean候选时，该Bean优先被考虑。多数据源配置的时候，必须要有一个主数据源，用@Primary标志该Bean。
同理，接着配置Oracle数据库对应的配置类：

OracleDatasourceConfig：

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@Configuration
@MapperScan(basePackages = OracleDatasourceConfig.PACKAGE, sqlSessionFactoryRef = "oracleSqlSessionFactory")
public class OracleDatasourceConfig {

    // oracledao扫描路径
    static final String PACKAGE = "com.wno704.boot.oracledao";
    // mybatis mapper扫描路径
    static final String MAPPER_LOCATION = "classpath:mapper/oracle/*.xml";

    @Bean(name = "oracledatasource")
    @ConfigurationProperties("spring.datasource.druid.oracle")
    public DataSource oracleDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "oracleTransactionManager")
    public DataSourceTransactionManager oracleTransactionManager() {
        return new DataSourceTransactionManager(oracleDataSource());
    }

    @Bean(name = "oracleSqlSessionFactory")
    public SqlSessionFactory oracleSqlSessionFactory(@Qualifier("oracledatasource") DataSource dataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        //如果不使用xml的方式配置mapper，则可以省去下面这行mapper location的配置。
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(OracleDatasourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

具体的application.yml配置如下：

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spring:
  datasource:
    druid:
      # 数据库访问配置, 使用druid数据源
      mysql:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/springboot?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC&allowMultiQueries=true&useSSL=false
        username: spring
        password: spring#123
      oracle:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: oracle.jdbc.driver.OracleDriver
        url: jdbc:oracle:thin:@125.72.228.21:1521:qhfwbzdb
        username: wno704
        password: wno704db312
      # 连接池配置
      initial-size: 5
      min-idle: 5
      max-active: 20
      # 连接等待超时时间
      max-wait: 30000
      # 配置检测可以关闭的空闲连接间隔时间
      time-between-eviction-runs-millis: 60000
      # 配置连接在池中的最小生存时间
      min-evictable-idle-time-millis: 300000
      validation-query: select '1' from dual
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      # 打开PSCache，并且指定每个连接上PSCache的大小
      pool-prepared-statements: true
      max-open-prepared-statements: 20
      max-pool-prepared-statement-per-connection-size: 20
      # 配置监控统计拦截的filters, 去掉后监控界面sql无法统计, 'wall'用于防火墙
      filters: stat,wall
      # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
      aop-patterns: com.springboot.service.*


      # WebStatFilter配置
      web-stat-filter:
        enabled: true
        # 添加过滤规则
        url-pattern: /*
        # 忽略过滤的格式
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

      # StatViewServlet配置
      stat-view-servlet:
        enabled: true
        # 访问路径为/druid时，跳转到StatViewServlet
        url-pattern: /druid/*
        # 是否能够重置数据
        reset-enable: false
        # 需要账号密码才能访问控制台
        login-username: druid
        login-password: druid123
        # IP白名单
        # allow: 127.0.0.1
        #　IP黑名单（共同存在时，deny优先于allow）
        # deny: 192.168.1.218

      # 配置StatFilter
      filter:
        stat:
          log-slow-sql: true

脚本导入：
myslq脚本参考 《Spring-Boot整合MyBatis》

oracle脚本导入：

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CREATE TABLE "WNO704"."STUDENT" (
"SNO" NUMBER NOT NULL,
"SNAME" NVARCHAR2(50),
"SSEX" NVARCHAR2 (2),
CONSTRAINT "PK_STUDENT_SNO" PRIMARY KEY ("SNO") 
) 
tablespace WNO704 
	PCTFREE 10 
	initrans 1 
	maxtrans 255 storage (
		INITIAL 768K 
		next 8K 
		minextents 1 
		MAXEXTENTS unlimited t 8K 
		minextents 1 
		MAXEXTENTS unlimited 
);

COMMENT ON COLUMN "WNO704"."STUDENT"."SNO" IS '学号';
COMMENT ON COLUMN "WNO704"."STUDENT"."SNAME" IS '姓名';
COMMENT ON COLUMN "WNO704"."STUDENT"."SSEX" IS '性别';

INSERT INTO "STUDENT" VALUES (1, 'KangKang', 'M');
INSERT INTO "STUDENT" VALUES (2, 'Mike', 'M');
INSERT INTO "STUDENT" VALUES (3, 'Jane', 'F');

三、编码

配置完多数据源，接下来分别在com.springboot.mysqldao路径和com.springboot.oracledao路径下创建两个mapper接口：

MysqlStudentMapper：

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@Mapper
@Repository("mysqlStudentMapper")
public interface MysqlStudentMapper {
    List<Map<String, Object>> getAllStudents();
}

OracleStudentMapper：

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@Mapper
@Repository("oracleStudentMapper")
public interface OracleStudentMapper {
    List<Map<String, Object>> getAllStudents();
}

接着创建mapper接口对应的实现：

在src/main/resource/mapper/mysql/路径下创建MysqlStudentMapper.xml：

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wno704.boot.mysqldao.MysqlStudentMapper">
    <select id="getAllStudents" resultType="java.util.Map">
        select * from student
    </select>
</mapper>

在src/main/resource/mapper/oracle/路径下创建OracleStudentMapper.xml：

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.wno704.boot.oracledao.OracleStudentMapper">
    <select id="getAllStudents" resultType="java.util.Map">
        select * from student
    </select>
</mapper>

编写StudentService：

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public interface StudentService {
    List<Map<String, Object>> getAllStudentsWithMysql();
    List<Map<String, Object>> getAllStudentsWithOracle();
}

编写实现类StudentServiceImpl：

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@Service("studentService")
public class StudentServiceImpl implements StudentService {
    @Autowired
    private MysqlStudentMapper mysqlStudentMapper;

    @Autowired
    private OracleStudentMapper oracleStudentMapper;

    @Override
    public List<Map<String, Object>> getAllStudentsWithMysql() {
        return this.mysqlStudentMapper.getAllStudents();
    }

    @Override
    public List<Map<String, Object>> getAllStudentsWithOracle() {
        return this.oracleStudentMapper.getAllStudents();
    }
}

四、测试

编写controller测试：

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@RestController
public class TestController {
    @Autowired
    private StudentService studentService;

    @RequestMapping( value = "/getAllStudentsWithMysql", method = RequestMethod.GET)
    public List<Map<String, Object>> getAllStudentsWithMysql() {
        return this.studentService.getAllStudentsWithMysql();
    }

    @RequestMapping( value = "/getAllStudentsWithOracle", method = RequestMethod.GET)
    public List<Map<String, Object>> getAllStudentsWithOracle() {
        return this.studentService.getAllStudentsWithOracle();
    }
}

最终项目目录如下图所示：

启动项目，访问： http://localhost:8080/getAllStudentsWithMysql

http://localhost:8080/getAllStudentsWithOracle