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springboot配置多个数据源两种方式实现

 更新时间：2022年03月07日 15:52:52   作者：江流。  
在我们的实际业务中可能会遇到；在一个项目里面读取多个数据库的数据来进行展示，spring对同时配置多个数据源是支持的，本文主要介绍了springboot配置多个数据源两种方式实现，感兴趣的可以了解一下

在我们的实际业务中可能会遇到；在一个项目里面读取多个数据库的数据来进行展示，spring对同时配置多个数据源是支持的。

本文中将展示两种方法来实现这个功能。

springboot+mybatis

第一种方式：

在配置文件中配置多个数据源，然后通过配置类来获取数据源以及mapper相关的扫描配置

pom.xml

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.9.RELEASE</version>
		<relativePath/>
	</parent>
  <dependencies>
  			<!-- druid数据源驱动 -->
			<dependency>
			   <groupId>com.alibaba</groupId>
			   <artifactId>druid-spring-boot-starter</artifactId>
			   <version>1.1.0</version>
			</dependency>
  			<dependency>
	            <groupId>mysql</groupId>
	            <artifactId>mysql-connector-java</artifactId>
	        </dependency>
			<!--mybatis SpringBoot依赖 -->
			<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter-tomcat</artifactId>
		    <scope>compile</scope>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
		</dependency>
		
		<!-- aop依赖 -->
		<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter-aop</artifactId>
		</dependency>
		
		<!-- mybatis -->
		<dependency>
		    <groupId>org.mybatis.spring.boot</groupId>
		    <artifactId>mybatis-spring-boot-starter</artifactId>
		    <version>1.3.1</version>
		</dependency>
		
		<!-- 通用mapper -->
		<dependency>
		    <groupId>tk.mybatis</groupId>
		    <artifactId>mapper-spring-boot-starter</artifactId>
		    <version>1.1.5</version>
		</dependency>
			<!-- druid监控依赖 -->
			<dependency>
				<groupId>com.alibaba</groupId>
				<artifactId>druid</artifactId>
				<version>1.0.28</version>
			</dependency>
  </dependencies>

application.yml

 spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driverClassName: com.mysql.jdbc.Driver
    
    url: jdbc:mysql://127.0.0.1:3306/test2?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456
    
    url2: jdbc:mysql://127.0.0.1:3306/test1?useUnicode=true&characterEncoding=utf8
    username2: root
    password2: 123456

 DruidDBConfig 连接池相关配置

package com.xbz.common.config;
 
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 * Druid监控
 */
@SuppressWarnings("AlibabaRemoveCommentedCode")
@Configuration
public class DruidDBConfig {
    private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);
 
    /**
     * 注册ServletRegistrationBean
     * @return
     */
    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");
        reg.addInitParameter("allow", ""); //白名单
        return reg;
    }
 
    /**
     * 注册FilterRegistrationBean
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        filterRegistrationBean.addInitParameter("profileEnable", "true");
        filterRegistrationBean.addInitParameter("principalCookieName", "USER_COOKIE");
        filterRegistrationBean.addInitParameter("principalSessionName", "USER_SESSION");
        filterRegistrationBean.addInitParameter("DruidWebStatFilter", "/*");
        return filterRegistrationBean;
    }
}

MasterDbConfig 注意读取数据库连接相关的键，以及扫描实体、mapper等

package com.xbz.common.config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
 
import javax.sql.DataSource;
import java.sql.SQLException;
 
 
@Configuration
@MapperScan(basePackages  = MasterDbConfig.PACKAGE , sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDbConfig {
    private Logger logger = LoggerFactory.getLogger(MasterDbConfig.class);
    // 精确到 master 目录，以便跟其他数据源隔离
    static final String PACKAGE = "com.xbz.**.dao.master";
    private static final String MAPPER_LOCATION = "classpath*:mapper/master/*.xml";
    private static final String DOMAIN_PACKAGE = "com.xbz.**.domain";
 
    @Value("${spring.datasource.url}")
    private String dbUrl;
 
    @Value("${spring.datasource.username}")
    private String username;
 
    @Value("${spring.datasource.password}")
    private String password;
 
    @Value("${spring.datasource.driverClassName}")
    private String driverClassName;
 
 
    @Bean(name="masterDataSource")   //声明其为Bean实例
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource
    public DataSource masterDataSource() {
        DruidDataSource datasource = new DruidDataSource();
 
        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
 
        return datasource;
    }
 
    @Bean(name = "masterTransactionManager")
    @Primary
    public DataSourceTransactionManager masterTransactionManager() {
        return new DataSourceTransactionManager(masterDataSource());
    }
 
    @Bean(name = "masterSqlSessionFactory")
    @Primary
    public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(masterDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(MasterDbConfig.MAPPER_LOCATION));
        sessionFactory.setTypeAliasesPackage(DOMAIN_PACKAGE);
        //mybatis 数据库字段与实体类属性驼峰映射配置
        sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
        return sessionFactory.getObject();
    }
}

ClusterDbConfig 

package com.xbz.common.config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 
import javax.sql.DataSource;
import java.sql.SQLException;
 
/**
 * 从数据源配置
 * 若需要配置更多数据源 , 直接在yml中添加数据源配置再增加相应的新的数据源配置类即可
 */
@Configuration
@MapperScan(basePackages  = ClusterDbConfig.PACKAGE , sqlSessionFactoryRef = "clusterSqlSessionFactory")
public class ClusterDbConfig {
    private Logger logger = LoggerFactory.getLogger(ClusterDbConfig.class);
    // 精确到 cluster 目录，以便跟其他数据源隔离
    static final String PACKAGE = "com.xbz.**.dao.cluster";
    private static final String MAPPER_LOCATION = "classpath*:mapper/cluster/*.xml";
    private static final String DOMAIN_PACKAGE = "com.xbz.**.domain";
 
    @Value("${spring.datasource.url2}")
    private String dbUrl;
 
    @Value("${spring.datasource.username2}")
    private String username;
 
    @Value("${spring.datasource.password2}")
    private String password;
 
    @Value("${spring.datasource.driverClassName}")
    private String driverClassName;
 
    
 
    @Bean(name="clusterDataSource")   //声明其为Bean实例
    public DataSource clusterDataSource() {
        DruidDataSource datasource = new DruidDataSource();
 
        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        return datasource;
    }
 
    @Bean(name = "clusterTransactionManager")
    public DataSourceTransactionManager clusterTransactionManager() {
        return new DataSourceTransactionManager(clusterDataSource());
    }
 
    @Bean(name = "clusterSqlSessionFactory")
    public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("clusterDataSource") DataSource culsterDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(culsterDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(ClusterDbConfig.MAPPER_LOCATION));
        sessionFactory.setTypeAliasesPackage(DOMAIN_PACKAGE);
        //mybatis 数据库字段与实体类属性驼峰映射配置
        sessionFactory.getObject().getConfiguration().setMapUnderscoreToCamelCase(true);
        return sessionFactory.getObject();
    }
}

不同的数据源配置不佟的mapper扫描位置，然后需要哪一个数据源就注入哪一个mapper接口即可

这样获取的数据就是来自不同的数据源了，这种方法比较简单。

方法二

配置一个默认使用的数据源，然后定义多个其他的数据源，使用aop形成注解式选择数据源

# 默认数据源
 
spring:
  datasource:
    druid:
      # 数据库访问配置, 使用druid数据源 
      type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: com.mysql.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8
      username: root
      password: 123456
 
# 其他数据源
 
custom:
  datasource:
    druid:
       type: com.alibaba.druid.pool.DruidDataSource
       names: fishlog,fishgame
       fishlog:
         driverClassName: com.mysql.jdbc.Driver
         url: jdbc:mysql://127.0.0.1:3306/test1?useUnicode=true&characterEncoding=utf8
         username: root
         password: 123456
       fishgame:
         driverClassName: com.mysql.jdbc.Driver
         url: jdbc:mysql://127.0.0.1:3306/test2?useUnicode=true&characterEncoding=utf8
         username: root
         password: 123456

然后启动类中注入注解

注解类及参数value TargetDataSource 

package com.sysmg.common.config.datasoure;
 
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
 
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
	String value();
}

 DynamicDataSource 

package com.sysmg.common.config.datasoure;
 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
 
public class DynamicDataSource extends AbstractRoutingDataSource {
 
	@Override
	protected Object determineCurrentLookupKey() {
		return DynamicDataSourceContextHolder.getDataSourceType();
	}
 
}

DynamicDataSourceAspect切面实现

package com.sysmg.common.config.datasoure;
 
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
 
@Aspect
@Order(-10) // 保证该AOP在@Transactional之前执行
@Component
public class DynamicDataSourceAspect {
	@Before("@annotation(targetDataSource)")
	public void changeDataSource(JoinPoint point, TargetDataSource targetDataSource) throws Throwable {
		String dsId = targetDataSource.value();
		if (!DynamicDataSourceContextHolder.containsDataSource(dsId)) {
			System.err.println("数据源[{}]不存在，使用默认数据源 > {}" + targetDataSource.value() + point.getSignature());
		} else {
			System.out.println("UseDataSource : {} > {}" + targetDataSource.value() + point.getSignature());
			DynamicDataSourceContextHolder.setDataSourceType(targetDataSource.value());
		}
	}
 
	@After("@annotation(targetDataSource)")
	public void restoreDataSource(JoinPoint point, TargetDataSource targetDataSource) {
		System.out.println("RevertDataSource : {} > {}"+targetDataSource.value()+point.getSignature());
		DynamicDataSourceContextHolder.clearDataSourceType();
	}
}

DynamicDataSourceContextHolder

package com.sysmg.common.config.datasoure;
 
import java.util.ArrayList;
 
import java.util.List;
 
public class DynamicDataSourceContextHolder {
	private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
	public static List<String> dataSourceIds = new ArrayList<String>();
 
	public static void setDataSourceType(String dataSourceType) {
		contextHolder.set(dataSourceType);
	}
 
	public static String getDataSourceType() {
		return contextHolder.get();
	}
 
	public static void clearDataSourceType() {
		contextHolder.remove();
	}
 
	public static boolean containsDataSource(String dataSourceId){
		return dataSourceIds.contains(dataSourceId);
	}
}

DynamicDataSourceRegister数据源注册类

package com.sysmg.common.config.datasoure;
 
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
 
public class DynamicDataSourceRegister implements ImportBeanDefinitionRegistrar, EnvironmentAware {
	private static final Object DATASOURCE_TYPE_DEFAULT = "com.alibaba.druid.pool.DruidDataSource";
	private ConversionService conversionService = new DefaultConversionService();
	private PropertyValues dataSourcePropertyValues;
	private DataSource defaultDataSource;
	private Map<String, DataSource> customDataSources = new HashMap<String, DataSource>();
 
	@Override
	public void setEnvironment(Environment environment) {
		System.out.println("DynamicDataSourceRegister.setEnvironment()");
		initDefaultDataSource(environment);
		initCustomDataSources(environment);
	}
 
	private void initDefaultDataSource(Environment env) {
		RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "spring.datasource.druid.");
		Map<String, Object> dsMap = new HashMap<String, Object>();
		dsMap.put("type", propertyResolver.getProperty("type"));
		dsMap.put("driverClassName", propertyResolver.getProperty("driverClassName"));
		dsMap.put("url", propertyResolver.getProperty("url"));
		dsMap.put("username", propertyResolver.getProperty("username"));
		dsMap.put("password", propertyResolver.getProperty("password"));
		defaultDataSource = buildDataSource(dsMap);
		dataBinder(defaultDataSource, env);
	}
 
	private void initCustomDataSources(Environment env) {
		RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "custom.datasource.druid.");
		String dsPrefixs = propertyResolver.getProperty("names");
		for (String dsPrefix : dsPrefixs.split(",")) {// 多个数据源
			Map<String, Object> dsMap = propertyResolver.getSubProperties(dsPrefix + ".");
			DataSource ds = buildDataSource(dsMap);
			customDataSources.put(dsPrefix, ds);
			dataBinder(ds, env);
		}
	}
 
	@SuppressWarnings("unchecked")
	public DataSource buildDataSource(Map<String, Object> dsMap) {
		Object type = dsMap.get("type");
		if (type == null) {
			type = DATASOURCE_TYPE_DEFAULT;// 默认DataSource
		}
		Class<? extends DataSource> dataSourceType;
		try {
			dataSourceType = (Class<? extends DataSource>) Class.forName((String) type);
			String driverClassName = dsMap.get("driverClassName").toString();
			String url = dsMap.get("url").toString();
			String username = dsMap.get("username").toString();
			String password = dsMap.get("password").toString();
			DataSourceBuilder factory = DataSourceBuilder.create().driverClassName(driverClassName).url(url)
					.username(username).password(password).type(dataSourceType);
			return factory.build();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}
 
	private void dataBinder(DataSource dataSource, Environment env) {
		RelaxedDataBinder dataBinder = new RelaxedDataBinder(dataSource);
		dataBinder.setConversionService(conversionService);
		dataBinder.setIgnoreNestedProperties(false);// false
		dataBinder.setIgnoreInvalidFields(false);// false
		dataBinder.setIgnoreUnknownFields(true);// true
		if (dataSourcePropertyValues == null) {
			Map<String, Object> rpr = new RelaxedPropertyResolver(env, "spring.datasource").getSubProperties(".");
			Map<String, Object> values = new HashMap<>(rpr);
			values.remove("type");
			values.remove("driverClassName");
			values.remove("url");
			values.remove("username");
			values.remove("password");
			dataSourcePropertyValues = new MutablePropertyValues(values);
		}
		dataBinder.bind(dataSourcePropertyValues);
	}
 
	@Override
	public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
		System.out.println("DynamicDataSourceRegister.registerBeanDefinitions()");
		Map<Object, Object> targetDataSources = new HashMap<Object, Object>();
		targetDataSources.put("dataSource", defaultDataSource);
		DynamicDataSourceContextHolder.dataSourceIds.add("dataSource");
		targetDataSources.putAll(customDataSources);
		for (String key : customDataSources.keySet()) {
			DynamicDataSourceContextHolder.dataSourceIds.add(key);
		}
		GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
		beanDefinition.setBeanClass(DynamicDataSource.class);
		beanDefinition.setSynthetic(true);
		MutablePropertyValues mpv = beanDefinition.getPropertyValues();
		mpv.addPropertyValue("defaultTargetDataSource", defaultDataSource);
		mpv.addPropertyValue("targetDataSources", targetDataSources);
		registry.registerBeanDefinition("dataSource", beanDefinition);
	}
}

这里使用的时候把需要使用的表名注入，如果是默认的数据源，则不需要加这个注解，具体的springboot自定义注解的建立，可参考https://www.jb51.net/article/239952.htm，这里的mapper文件和实体扫描可以跟默认的数据源配置相同即可

到此这篇关于springboot配置多个数据源两种方式实现的文章就介绍到这了,更多相关springboot配置多个数据源内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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