Spring+spring mvc+mybatis 多数据源切换

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spring mvc+mybatis+多数据源切换 选取oracle,mysql作为例子切换数据源。oracle为默认数据源，在测试的action中，进行mysql和oracle的动态切换。 
 整理的比较粗略，将代码分享给大家，【源码地址获取】
web.xml 

Java代码  

1. <context-param>  
2.         <param-name>webAppRootKey</param-name>  
3.         <param-value>trac</param-value>  
4.     </context-param>  
5.   
6.     <!-- Spring的log4j监听器 -->  
7.     <listener>  
8.         <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>  
9.     </listener>  
10.   
11.     <!-- 字符集 过滤器 -->  
12.     <filter>  
13.         <filter-name>CharacterEncodingFilter</filter-name>  
14.         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
15.         <init-param>  
16.             <param-name>encoding</param-name>  
17.             <param-value>utf8</param-value>  
18.         </init-param>  
19.         <init-param>  
20.             <param-name>forceEncoding</param-name>  
21.             <param-value>true</param-value>  
22.         </init-param>  
23.     </filter>  
24.     <filter-mapping>  
25.         <filter-name>CharacterEncodingFilter</filter-name>  
26.         <url-pattern>/*</url-pattern>  
27.     </filter-mapping>  
28.   
29.     <!-- Spring view分发器 -->  
30.     <servlet>  
31.         <servlet-name>dispatcher</servlet-name>  
32.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
33.         <init-param>  
34.             <param-name>contextConfigLocation</param-name>  
35.             <param-value>/WEB-INF/dispatcher.xml</param-value>  
36.         </init-param>  
37.         <load-on-startup>1</load-on-startup>  
38.     </servlet>  
39.     <servlet-mapping>  
40.         <servlet-name>dispatcher</servlet-name>  
41.         <url-pattern>*.action</url-pattern>  
42.     </servlet-mapping>  
43.       
44.     <listener>  
45.         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
46.     </listener>  

dispatcher.xml 

Java代码  

1. <mvc:annotation-driven />  
2.     <context:component-scan base-package="com.trac" />  
3.   
4.     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />  
5.   
6.     <!-- freemarker config -->  
7.     <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">  
8.         <property name="templateLoaderPath" value="/WEB-INF/freemarker/" />  
9.         <property name="freemarkerVariables">  
10.             <map>  
11.                 <entry key="xml_escape" value-ref="fmXmlEscape" />  
12.             </map>  
13.         </property>  
14.         <property name="freemarkerSettings">  
15.             <props>  
16.                 <prop key="defaultEncoding">UTF-8</prop>  
17.             </props>  
18.         </property>  
19.     </bean>  
20.   
21.     <bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" />  
22.   
23.     <!-- View resolvers can also be configured with ResourceBundles or XML files.   
24.         If you need different view resolving based on Locale, you have to use the   
25.         resource bundle resolver. -->  
26.     <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">  
27.         <property name="exposeRequestAttributes" value="true" />  
28.         <property name="exposeSessionAttributes" value="true" />  
29.         <property name="exposeSpringMacroHelpers" value="true" />  
30.         <property name="contentType" value="text/html;charset=UTF-8" />  
31.         <property name="cache" value="true" />  
32.         <property name="prefix" value="" />  
33.         <property name="suffix" value=".ftl" />  
34.     </bean>  

applicationContext.xml 

Java代码  

1. <bean id="parentDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  
2.     </bean>  
3.       
4.     <bean id="mySqlDataSource" parent="parentDataSource">  
5.         <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>  
6.         <property name="url" value="jdbc:mysql://localhost:3306/test"></property>  
7.         <property name="username" value="root"></property>  
8.         <property name="password" value="root"></property>  
9.     </bean>  
10.       
11.     <bean id="oracleDataSource" parent="parentDataSource">  
12.         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>  
13.         <property name="url" value="jdbc:oracle:thin:@10.16.17.40:1531:addb"></property>  
14.         <property name="username" value="trac"></property>  
15.         <property name="password" value="trac"></property>  
16.     </bean>  
17.       
18.     <bean id="dataSource" class="com.trac.dao.datasource.DataSources">  
19.         <property name="targetDataSources">  
20.             <map key-type="java.lang.String">  
21.                 <entry value-ref="mySqlDataSource" key="MYSQL"></entry>  
22.                 <entry value-ref="oracleDataSource" key="ORACLE"></entry>  
23.             </map>  
24.         </property>  
25.         <property name="defaultTargetDataSource" ref="oracleDataSource"></property>  
26.     </bean>  
27.   
28.     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
29.         <property name="dataSource" ref="dataSource" />  
30.     </bean>  
31.   
32.     <!-- 创建SqlSessionFactory，同时指定数据源和mapper -->  
33.     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
34.         <property name="dataSource" ref="dataSource" />  
35.         <property name="mapperLocations" value="classpath*:com/trac/ibatis/dbcp/*.xml" />  
36.     </bean>  
37.   
38.     <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">  
39.         <constructor-arg index="0" ref="sqlSessionFactory" />  
40.     </bean>  
41.   
42.     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
43.         <property name="basePackage" value="com.trac.dao" />  
44.     </bean>  

配置 parentDataSource 的父bean.再配置多个数据源继承这个父bean,对driverClass,url,username,password,等数据源连接参数进行各自的重写。例如 mySqlDataSource ，在 DataSources bean中注入所有要切换的数据源，并且设置默认的数据源。 

DataSourceInstances.java 

Java代码  

1. public class DataSourceInstances{  
2.     public static final String MYSQL="MYSQL";  
3.     public static final String ORACLE="ORACLE";  
4. }     
5.   
6. 定义数据源的标识, 和applicationContext.xml中 DataSources 的 targetDataSources 的key对应  

DataSourceSwitch.java 

Java代码  

1. public class DataSourceSwitch{  
2.     private static final ThreadLocal contextHolder=new ThreadLocal();  
3.       
4.     public static void setDataSourceType(String dataSourceType){  
5.         contextHolder.set(dataSourceType);  
6.     }  
7.       
8.     public static String getDataSourceType(){  
9.         return (String) contextHolder.get();  
10.     }  
11.       
12.     public static void clearDataSourceType(){  
13.         contextHolder.remove();  
14.     }  
15. }  

DataSources.java 

Java代码  

1. import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;  
2.   
3. public class DataSources extends AbstractRoutingDataSource{  
4.   
5.     @Override  
6.     protected Object determineCurrentLookupKey() {  
7.         return DataSourceSwitch.getDataSourceType();  
8.     }  
9.   
10. }  
11.   
12. 配置于applicationContext 中，线程局部变量ThreadLocal contextHolder 保存当前需要的数据源类型，当 DataSourceSwitch.setDataSourceType(DataSourceInstances.XXX) 保存当前需要的数据源类型的时候，DataSources 会从当前线程中查找线程变量的数据源类型，从而决定使用何种数据源 

TestAction.java 
Java代码  

Spring+spring mvc+mybatis 多数据源切换

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原文地址：http://www.cnblogs.com/zhenjava/p/4716794.html