ssm框架实现多数据源的配置，本人亲测，项目正在使用。

1、这是项目的目录结构


2、Web.XML

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<!-- 初始化spring容器-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath*:spring/applicationContext-*.xml,
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--
扫描Springmvc
-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 拦截所有 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<!-- post乱码处理-->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

</web-app>

3、sqlMapConfig.xml

<!DOCTYPE configuration

PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

    <typeAliases>

        <!-- 扫描当前包下的所有的类  类型的名称就是类名(首字母大写或小写) -->

        <package name="com.gongsi.bean"/>

    </typeAliases>

    

</configuration>

4、applicationContext-core.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:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd  http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.2.xsd  http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

     

    <!-- 开启注解模式 -->
<context:annotation-config />
<!-- 扫描我们 action service dao 文件 -->
<context:component-scan base-package="com.gongsi.*"></context:component-scan>
 
<!-- 物理数据源  -->
<!--我是用的SQLServer数据库，可自行调换  -->
<bean id="MydataSource_1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property>
<property name="url" value="jdbc:sqlserver://localhost:****;DatabaseName=**"></property>
<property name="username" value="**"></property>
<property name="password" value="****"></property>
</bean>

<bean id="MydataSource_2" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"></property>
<property name="url" value="jdbc:sqlserver://localhost:****;DatabaseName=****"></property>
<property name="username" value="**"></property>
<property name="password" value="****"></property>
</bean>
<bean id="dataSource" class="com.gongsi.util.DynamicDataSource">  

    <property name="targetDataSources">  

        <map key-type="java.lang.String">

            <!-- 指定lookupKey和与之对应的数据源 -->

            <entry key="1" value-ref="MydataSource_1"></entry>  

            <entry key="2" value-ref="MydataSource_2"></entry>  

        </map>  

    </property>  

    <!-- 这里可以指定默认的数据源 -->

    <property name="defaultTargetDataSource" ref="MydataSource_2" />  
</bean>

     <!-- 通过IOC管理sqlSessionFactory -->   

     <bean id="MysqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

           <property name="dataSource" ref="dataSource"></property>

           <!-- 加载我们的mybatis的总控制文件 -->

           <property name="configLocation" value="classpath:mapper/sqlMapConfig.xml"></property>

     </bean>

     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">    

          <!--          
                            扫描当前包下的所有mapper 如果映射关系文件不再一个包中，我们多个包之间使用逗号分隔                   
                            在程序中获取接口代理的名称就是当前接口的首字母小写形式

          -->         

          <property name="basePackage" value="com.gongsi.mapper"></property>

          <!-- 使用sqlSessionFactory -->

          <property name="sqlSessionFactoryBeanName" value="MysqlSessionFactory"></property>

     </bean>

</beans> 

5、applicationContext-transaction.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:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd  http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.2.xsd  http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

    <!-- 声明spring中的事务管理器 -->
<bean id="manager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

    <tx:advice id="Myadvice" transaction-manager="manager">
    <tx:attributes>
        <!-- REQUIRED 事务的传播性,如果没有事务给当前的方法开启一个新的事务 -->
    
        <tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
        <!-- 這個類型的方法不需要使用事務 -->
        <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
               
        
    </tx:attributes>

</tx:advice>

<aop:aspectj-autoproxy></aop:aspectj-autoproxy>  

   <bean id="dataSourceAspect" class="com.gongsi.util.DataSourceAspect" />

    <aop:config>

        <aop:aspect ref="dataSourceAspect" >

            <!-- 拦截所有service方法 -->

            <!--我这里实在Mapper上面加的注解，可自行调换  -->

            <aop:pointcut id="dataSourcePointcut" expression="execution(* com.gongsi.mapper..*.*(..))"/>

            <aop:before pointcut-ref="dataSourcePointcut" method="intercept" />

        </aop:aspect>

    </aop:config>

</beans> 

6、springmvc.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:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd  http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.2.xsd  http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
<mvc:annotation-driven/>

<!--自动扫描，使springMVC认为包下用了@controller注解的类是控制器-->

      <context:component-scan base-package="com.gongsi.controller"></context:component-scan>

      <!--  视图解析器:通用的 -->

      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

            <property name="prefix" value="/jsp/"></property> 

            <property name="suffix" value=".jsp"></property>     

      </bean>

      <!-- 映射器 -->

      <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>

      <!-- 适配器 -->

      <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

               <!-- 整合json使用配置 -->
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
</list>
</property>

      </bean>
 

</beans>

7、自定义注解目录



8、DataSource.java

package com.gongsi.util;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.ElementType;

/*@Retention(RetentionPolicy.RUNTIME)  

@Target(ElementType.METHOD)*/

@Target({ElementType.TYPE,ElementType.METHOD})

@Retention(RetentionPolicy.RUNTIME)

public @interface DataSource {  

    String value();  

}  

9、DataSourceAspect.java

package com.gongsi.util;

import java.lang.reflect.Method;  

import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.reflect.MethodSignature;

  

public class DataSourceAspect {

    /**

     * 拦截目标方法，获取由@DataSource指定的数据源标识，设置到线程存储中以便切换数据源

     * 

     * @param point

     * @throws Exception

     */

    public void intercept(JoinPoint point) throws Exception {

        Class<?> target = point.getTarget().getClass();

        MethodSignature signature = (MethodSignature) point.getSignature();

        // 默认使用目标类型的注解，如果没有则使用其实现接口的注解

        for (Class<?> clazz : target.getInterfaces()) {

            resolveDataSource(clazz, signature.getMethod());

        }

        resolveDataSource(target, signature.getMethod());

    }

    /**

     * 提取目标对象方法注解和类型注解中的数据源标识

     * 

     * @param clazz

     * @param method

     */

    private void resolveDataSource(Class<?> clazz, Method method) {

        try {

            Class<?>[] types = method.getParameterTypes();

            // 默认使用类型注解

            if (clazz.isAnnotationPresent(DataSource.class)) {

                DataSource source = clazz.getAnnotation(DataSource.class);

                DynamicDataSourceHolder.setDataSource(source.value());

            }

            // 方法注解可以覆盖类型注解

            Method m = clazz.getMethod(method.getName(), types);

            if (m != null && m.isAnnotationPresent(DataSource.class)) {

                DataSource source = m.getAnnotation(DataSource.class);

                DynamicDataSourceHolder.setDataSource(source.value());

            }

        } catch (Exception e) {

            System.out.println(clazz + ":" + e.getMessage());

        }

    }

}

10、DynamicDataSource.java

package com.gongsi.util;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource extends AbstractRoutingDataSource {

    @Override

    protected Object determineCurrentLookupKey() {

        // 从自定义的位置获取数据源标识

        return DynamicDataSourceHolder.getDataSource();

    }

}

11、DynamicDataSourceHolder.java

package com.gongsi.util;

import java.lang.annotation.Retention;

import java.lang.annotation.Target;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.ElementType;

public class DynamicDataSourceHolder {

    /**

     * 注意：数据源标识保存在线程变量中，避免多线程操作数据源时互相干扰

     */

    private static final ThreadLocal<String> THREAD_DATA_SOURCE = new ThreadLocal<String>();

    public static String getDataSource() {

        return THREAD_DATA_SOURCE.get();

    }

    public static void setDataSource(String dataSource) {

        THREAD_DATA_SOURCE.set(dataSource);

    }

    public static void clearDataSource() {

        THREAD_DATA_SOURCE.remove();

    }

}

12、使用注解



13、注解的具体使用


里面的value值是在这个文件里面定义的，分离数据库的key


14、本人项目正在使用，所以童叟无欺。附下载地址：http://download.csdn.net/download/qq_38063475/10170674

，可加群321964905