Spring 中多数据源的使用

Spring 中配置多数据源

​​本文简单的介绍spring中使用多个数据库的问题和配置过程​​

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项目依赖jar

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一、jdbc配置

示例：此处以两个数据库为例 同样使用mysql  其他数据库配置类似 。

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.10.222:3306/test
jdbc.username=root
jdbc.password=root

jdbc1.driverClassName=com.mysql.jdbc.Driver
jdbc1.url=jdbc:mysql://192.168.10.222:3306/world
jdbc1.username=root
jdbc1.password=root

二、Spring 相关配置步骤

1.引入spring配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.julong</groupId>
    <artifactId>spring-learn-examples</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>spring-learn-example-db</artifactId>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <spring.security.version>3.2.3.RELEASE</spring.security.version>
  </properties>
  <dependencies>
    <!-- Spring dependencies -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>3.2.8.RELEASE</version>
      <scope>runtime</scope>
      <exclusions>
        <exclusion>
          <groupId>commons-logging</groupId>
          <artifactId>commons-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc-portlet</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>3.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.49</version>
    </dependency>
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.4</version>
    </dependency>
    <!-- log4j -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
      <version>1.5.8</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.5.8</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.5.8</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.14</version>
      <scope>runtime</scope>
    </dependency>
    <!-- Spring Security -->
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
      <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>3.2.3.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>3.0-alpha-1</version>
      <scope>provided</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/jsp-api -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

 

2.spring配置

代码如下（示例）：

spring-application-databases.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <!-- 引入文件的第一种配置  -->
    <context:property-placeholder location="jdbc.properties"/>
    <!-- 引入文件的第二种配置 
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
      <property name="locations" value="classpath:jdbc.properties"/>
    </bean>
     -->

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"    destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>


    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--  配置事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
          <tx:method name="get*" read-only="true"/>
          <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>
    
    <aop:config>
      <aop:pointcut id="serviceMethods" expression="execution(* com.julong..*Service.*(..))"/>
      <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethods"/>
    </aop:config>
    
    <bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource"   destroy-method="close">
        <property name="driverClassName" value="${jdbc1.driverClassName}" />
        <property name="url" value="${jdbc1.url}" />
        <property name="username" value="${jdbc1.username}" />
        <property name="password" value="${jdbc1.password}" />
    </bean>
    
    <bean id="jdbcTemplate1" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource1"></property>
    </bean>
    
    <!--  配置事务 -->
    <bean id="transactionManager1" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource1"/>
    </bean>
    
    <tx:advice id="txAdvice1" transaction-manager="transactionManager1">
        <tx:attributes>
          <tx:method name="get*" read-only="true"/>
          <tx:method name="*"/>
        </tx:attributes>
    </tx:advice>
    
    <aop:config>
      <aop:pointcut id="serviceMethods1" expression="execution(* com.julong..*Service.*(..))"/>
      <aop:advisor advice-ref="txAdvice1" pointcut-ref="serviceMethods1"/>
    </aop:config>
    
</beans>

总配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <import resource="spring-application-databases.xml"/>
</beans>

 java 调用代码

package com.julong;

import org.apache.commons.dbcp.BasicDataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

/**
 * 执行启动spring 主程序
 * @author julong
 * @date 2022年6月2日 下午7:54:32
 * @desc spring 中多数据源方式
 */
public class SpringApplicationMain {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ApplicationContext context = new ClassPathXmlApplicationContext("spring-application.xml");
    
    System.out.println("启动服务");
    
    //获取数据源
    BasicDataSource  dataSource = (BasicDataSource) context.getBean("dataSource");
    System.out.println(dataSource.getUrl());
  
    
    BasicDataSource  dataSource1 = (BasicDataSource) context.getBean("dataSource1");
    System.out.println(dataSource1.getUrl());
    try {
      JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");
      System.out.println(jdbcTemplate.isLazyInit());
      
      JdbcTemplate jdbcTemplate1 = (JdbcTemplate) context.getBean("jdbcTemplate1");
      System.out.println(jdbcTemplate1.isLazyInit());
      
      DataSourceTransactionManager transactionManager = (DataSourceTransactionManager) context.getBean("transactionManager");
      System.out.println(transactionManager.isValidateExistingTransaction());
      
      DataSourceTransactionManager transactionManager1 = (DataSourceTransactionManager) context.getBean("transactionManager1");
      System.out.println(transactionManager.isValidateExistingTransaction());
    
      
      
      
      
      
      System.in.read();
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }

}

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总结

​​自己可以根据这篇文章直接copy运行 在项目中对应的应用 实现读写分离 ​​