springboot 配置多数据源实例代码（分包方式）

目录

• 1、数据库
• 2、pom与yml
  • 2.1、pom中的依赖部分
  • 2.2、yml数据库配置部分
• 3、数据源配置类 DataSourceConfig
  • 3.1、DataSourceConfig1.java
  • 3.2、DataSourceConfig2.java
• 4、dao层
• 5、xml文件
• 6、service与controller
• 7、测试

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