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  • SpringMVC配置双数据源，一个java项目同时连接两个数据库

    数据源在配置文件中的配置

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    1. <pre name="code" class="java"><?xml version="1.0" encoding="UTF-8"?>  
    2. <beans xmlns="http://www.springframework.org/schema/beans"  
    3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"  
    4.     xmlns:cache="http://www.springframework.org/schema/cache"  
    5.     xmlns:context="http://www.springframework.org/schema/context"  
    6.     xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"  
    7.     xmlns:jms="http://www.springframework.org/schema/jms" xmlns:lang="http://www.springframework.org/schema/lang"  
    8.     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:oxm="http://www.springframework.org/schema/oxm"  
    9.     xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task"  
    10.     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"  
    11.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd    
    12.     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd    
    13.     http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd    
    14.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd    
    15.     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd    
    16.     http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd    
    17.     http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.1.xsd    
    18.     http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.1.xsd    
    19.     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd    
    20.     http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd    
    21.     http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd    
    22.     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd    
    23.     http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">  
    24.   
    25.     <context:annotation-config />  
    26.   
    27.     <context:component-scan base-package="com"></context:component-scan>  
    28.   
    29.     <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
    30.         <property name="locations">  
    31.             <list>  
    32.                 <value>classpath:com/resource/config.properties</value>  
    33.             </list>  
    34.         </property>  
    35.     </bean>  
    36.   
    37.     <bean id="dataSourceOne" class="com.mchange.v2.c3p0.ComboPooledDataSource"  
    38.         destroy-method="close">  
    39.         <property name="driverClass" value="${dbOne.jdbc.driverClass}" />  
    40.         <property name="jdbcUrl" value="${dbOne.jdbc.url}" />  
    41.         <property name="user" value="${dbOne.jdbc.user}" />  
    42.         <property name="password" value="${dbOne.jdbc.password}" />  
    43.         <property name="initialPoolSize" value="${dbOne.jdbc.initialPoolSize}" />  
    44.         <property name="minPoolSize" value="${dbOne.jdbc.minPoolSize}" />  
    45.         <property name="maxPoolSize" value="${dbOne.jdbc.maxPoolSize}" />  
    46.     </bean>  
    47.   
    48.     <bean id="dataSourceTwo" class="com.mchange.v2.c3p0.ComboPooledDataSource"  
    49.         destroy-method="close">  
    50.         <property name="driverClass" value="${dbTwo.jdbc.driverClass}" />  
    51.         <property name="jdbcUrl" value="${dbTwo.jdbc.url}" />  
    52.         <property name="user" value="${dbTwo.jdbc.user}" />  
    53.         <property name="password" value="${dbTwo.jdbc.password}" />  
    54.         <property name="initialPoolSize" value="${dbTwo.jdbc.initialPoolSize}" />  
    55.         <property name="minPoolSize" value="${dbTwo.jdbc.minPoolSize}" />  
    56.         <property name="maxPoolSize" value="${dbTwo.jdbc.maxPoolSize}" />  
    57.     </bean>  
    58.   
    59.     <bean id="dynamicDataSource" class="com.core.DynamicDataSource">  
    60.         <property name="targetDataSources">  
    61.             <map key-type="java.lang.String">  
    62.                 <entry value-ref="dataSourceOne" key="dataSourceOne"></entry>  
    63.                 <entry value-ref="dataSourceTwo" key="dataSourceTwo"></entry>  
    64.             </map>  
    65.         </property>  
    66.         <property name="defaultTargetDataSource" ref="dataSourceOne">  
    67.         </property>  
    68.     </bean>  
    69.   
    70.     <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">  
    71.         <property name="dataSource" ref="dynamicDataSource" />  
    72.         <property name="hibernateProperties">  
    73.             <props>  
    74.                 <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>  
    75.                 <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop>  
    76.                 <prop key="hibernate.show_sql">false</prop>  
    77.                 <prop key="hibernate.format_sql">true</prop>  
    78.                 <prop key="hbm2ddl.auto">create</prop>  
    79.             </props>  
    80.         </property>  
    81.         <property name="packagesToScan">  
    82.             <list>  
    83.                 <value>com.po</value>  
    84.             </list>  
    85.         </property>  
    86.     </bean>  
    87.   
    88.     <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">  
    89.         <property name="sessionFactory" ref="sessionFactory" />  
    90.     </bean>  
    91.   
    92.     <aop:config>  
    93.         <aop:pointcut id="transactionPointCut" expression="execution(* com.dao..*.*(..))" />  
    94.         <aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointCut" />  
    95.     </aop:config>  
    96.   
    97.     <tx:advice id="txAdvice" transaction-manager="transactionManager">  
    98.         <tx:attributes>  
    99.             <tx:method name="add*" propagation="REQUIRED" />  
    100.             <tx:method name="save*" propagation="REQUIRED" />  
    101.             <tx:method name="update*" propagation="REQUIRED" />  
    102.             <tx:method name="delete*" propagation="REQUIRED" />  
    103.             <tx:method name="*" read-only="true" />  
    104.         </tx:attributes>  
    105.     </tx:advice>  
    106.   
    107.     <aop:config>  
    108.         <aop:aspect id="dataSourceAspect" ref="dataSourceInterceptor">  
    109.             <aop:pointcut id="daoOne" expression="execution(* com.dao.one.*.*(..))" />  
    110.             <aop:pointcut id="daoTwo" expression="execution(* com.dao.two.*.*(..))" />  
    111.             <aop:before pointcut-ref="daoOne" method="setdataSourceOne" />  
    112.             <aop:before pointcut-ref="daoTwo" method="setdataSourceTwo" />  
    113.         </aop:aspect>  
    114.     </aop:config>  
    115. </beans>  


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    DynamicDataSource.class
    



    

    

    [java] view plain copy

     
    

    

    

      

    1. package com.core;  
      2. 

    2.   
      3. 

    3. import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;  
      4. 

    4.   
      5. 

    5. public class DynamicDataSource extends AbstractRoutingDataSource{  
      6. 

    6.   
      7. 

    7.     @Override  
      8. 

    8.     protected Object determineCurrentLookupKey() {  
      9. 

    9.         return DatabaseContextHolder.getCustomerType();   
      10. 

    10.     }  
      11. 

    11.   
      12. 

    12. }  
      13. 

    

     DatabaseContextHolder.class设置数据源的类
    



    

    

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    1. package com.core;  
      2. 

    2.   
      3. 

    3. public class DatabaseContextHolder {  
      4. 

    4.   
      5. 

    5.     private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();  
      6. 

    6. <span style="white-space:pre">    </span>//设置要使用的数据源  
      7. 

    7.     public static void setCustomerType(String customerType) {  
      8. 

    8.         contextHolder.set(customerType);  
      9. 

    9.     }  
      10. 

    10. <span style="white-space:pre">    </span>//获取数据源  
      11. 

    11.     public static String getCustomerType() {  
      12. 

    12.         return contextHolder.get();  
      13. 

    13.     }  
      14. 

    14. <span style="white-space:pre">    </span>//清除数据源，使用默认的数据源  
      15. 

    15.     public static void clearCustomerType() {  
      16. 

    16.         contextHolder.remove();  
      17. 

    17.     }  
      18. 

    18. }  
      19. 

    

    DataSourceInterceptor.class
    

    

    

    [java] view plain copy

     
    


    


    

      

    1. package com.core;  
      2. 

    2.   
      3. 

    3. import org.aspectj.lang.JoinPoint;  
      4. 

    4. import org.springframework.stereotype.Component;  
      5. 

    5.   
      6. 

    6. @Component  
      7. 

    7. public class DataSourceInterceptor {  
      8. 

    8. <span style="white-space:pre;"> </span>//数据源1  
      9. 

    9.     public static final String SOURCE_PLAN = "dataSourceOne;  
      10. 

    10.     //数据源2  
      11. 

    11.         public static final String SOURCE_FUND = dataSourceTwo;  
      12. 


    

    }
    

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    springMVC数据源
    


    

    

    [html] view plain copy

     
    

    

    

      

    1. jdbc_driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver  
      2. 

    2. dataSourceOne=jdbc:sqlserver://115.29.***.**;DatabaseName=DB_GuiHua  
      3. 

    

    jdbc_username=**jdbc_password=**
    

    

    

    [java] view plain copy

     
    

    

    

      

    1. dataSourceTwo=jdbc:sqlserver://115.29.***.*;DatabaseName=DB_Fund  
      2. 

    


    

    Spring MVC会默认有一个数据源，当需要更换数据源时，要在调用事务之前配置
    



    

    

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    1. DataSourceContextHolder.setDbType(DataSourceType.SOURCE_FUND);//更换数据源  
      2. 

    

    

    

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    1. /** 
      2. 

    2.  * @ClassName: DataSourceContextHolder 
      3. 

    3.  * @Description: 数据库切换工具类 
      4. 

    4.  * @author: wzx 
      5. 

    5.  * @date: 2016-07-27 上午10:26:01 
      6. 

    6.  */  
      7. 

    7. public class DataSourceContextHolder {  
      8. 

    8.     private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();  
      9. 

    9.   
      10. 

    10.     public static void setDbType(String dbType) {  
      11. 

    11.         contextHolder.set(dbType);  
      12. 

    12.     }  
      13. 

    13.   
      14. 

    14.     public static String getDbType() {  
      15. 

    15.         return ((String) contextHolder.get());  
      16. 

    16.     }  
      17. 

    17.   
      18. 

    18.     public static void clearDbType() {  
      19. 

    19.         contextHolder.remove();  
      20. 

    20.     }  
      21. 

    21. }  
      22. 

    


    请点击---》   java架构师项目实战,高并发集群分布式,大数据高可用,视频教程  
    

    
    
                
    
                
              
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                原文地址：https://www.cnblogs.com/a347911/p/8183452.html
              
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