springboot 配置多数据源实例代码（分包方式）

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1、数据库

下面是实例中用到的两个数据库

2、pom与yml

2.1、pom中的依赖部分

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.0</version>
</dependency> <dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>


2.2、yml数据库配置部分

spring:
datasource:
db1: # 数据源1
jdbc-url: jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT%2B8
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
db2: # 数据源2
jdbc-url: jdbc:mysql://192.168.60.1:3306/test?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT%2B8
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver


代码文件结构

3、数据源配置类 DataSourceConfig

3.1、DataSourceConfig1.java

注意可能要修改的地方

包名：com.example.springdemo01.mapper.db1

mapping目录：classpath:mapping/db1/.xml

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "com.example.springdemo01.mapper.db1", sqlSessionFactoryRef = "db1SqlSessionFactory")
public class DataSourceConfig1 { @Primary // 表示这个数据源是默认数据源, 这个注解必须要加，因为不加的话spring将分不清楚那个为主数据源（默认数据源）
@Bean("db1DataSource")
@ConfigurationProperties(prefix = "spring.datasource.db1") //读取application.yml中的配置参数映射成为一个对象
public DataSource getDb1DataSource(){
return DataSourceBuilder.create().build();
} @Primary
@Bean("db1SqlSessionFactory")
public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致）
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db1/*.xml"));
return bean.getObject();
} @Primary
@Bean("db1SqlSessionTemplate")
public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory){
return new SqlSessionTemplate(sqlSessionFactory);
}
}


3.2、DataSourceConfig2.java

注意可能要修改的地方

包名：com.example.springdemo01.mapper.db2

mapping目录：classpath:mapping/db2/.xml

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "com.example.springdemo01.mapper.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceConfig2 { @Bean("db2DataSource")
@ConfigurationProperties(prefix = "spring.datasource.db2")
public DataSource getDb1DataSource(){
return DataSourceBuilder.create().build();
} @Bean("db2SqlSessionFactory")
public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db2/*.xml"));
return bean.getObject();
} @Bean("db2SqlSessionTemplate")
public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory){
return new SqlSessionTemplate(sqlSessionFactory);
}
}


4、dao层

UserDao.java (db1包下)

import org.springframework.stereotype.Repository;@Repository
public interface UserDao {
String getName();
}


UserDao2.java (db2包下)

import org.springframework.stereotype.Repository;@Repository
public interface UserDao2 {
String getName();
}


5、xml文件

user.xml (mapping/db1目录下)

<?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.example.springdemo01.mapper.db1.UserDao">
<select id="getName" resultType="String">
select name from user where id = 1;
</select>
</mapper>


user.xml (mapping/db1目录下)

<?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.example.springdemo01.mapper.db2.UserDao2">
<select id="getName" resultType="String">
select name from user where id = 1;
</select>
</mapper>


6、service与controller

service接口

public interface UserService {
String getName();
}


service实现层 （注意修改导入的dao层、service接口包名）

import com.example.springdemo01.mapper.db1.UserDao;
import com.example.springdemo01.mapper.db2.UserDao2;
import com.example.springdemo01.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class UserServiceImpl implements UserService {
@Autowired
UserDao dao1; @Autowired
UserDao2 dao2;
@Override
public String getName() {
return dao1.getName()+","+dao2.getName();
}
}


UserController.java

import com.example.springdemo01.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
public class UserController {
@Autowired
UserService service; @GetMapping("/get")
public String names(){
return service.getName();
}
}


7、测试