Spring MVC配置双数据源实现一个java项目同时连接两个数据库的方法

前言

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实现方法：

数据源在配置文件中的配置

<pre name="code" class="java"><?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:aop="http://www.springframework.org/schema/aop" 
 xmlns:cache="http://www.springframework.org/schema/cache" 
 xmlns:context="http://www.springframework.org/schema/context" 
 xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" 
 xmlns:jms="http://www.springframework.org/schema/jms" xmlns:lang="http://www.springframework.org/schema/lang" 
 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:oxm="http://www.springframework.org/schema/oxm" 
 xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task" 
 xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" 
 xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
 http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd 
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd 
 http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd 
 http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd 
 http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.1.xsd 
 http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.1.xsd 
 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
 http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd 
 http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd 
 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd"> 
 
 <context:annotation-config /> 
 
 <context:component-scan base-package="com"></context:component-scan> 
 
 <bean class="org.springframework.beans.factory.config.propertyplaceholderconfigurer"> 
  <property name="locations"> 
   <list> 
    <value>classpath:com/resource/config.properties</value> 
   </list> 
  </property> 
 </bean> 
 
 <bean id="datasourceone" class="com.mchange.v2.c3p0.combopooleddatasource" 
  destroy-method="close"> 
  <property name="driverclass" value="${dbone.jdbc.driverclass}" /> 
  <property name="jdbcurl" value="${dbone.jdbc.url}" /> 
  <property name="user" value="${dbone.jdbc.user}" /> 
  <property name="password" value="${dbone.jdbc.password}" /> 
  <property name="initialpoolsize" value="${dbone.jdbc.initialpoolsize}" /> 
  <property name="minpoolsize" value="${dbone.jdbc.minpoolsize}" /> 
  <property name="maxpoolsize" value="${dbone.jdbc.maxpoolsize}" /> 
 </bean> 
 
 <bean id="datasourcetwo" class="com.mchange.v2.c3p0.combopooleddatasource" 
  destroy-method="close"> 
  <property name="driverclass" value="${dbtwo.jdbc.driverclass}" /> 
  <property name="jdbcurl" value="${dbtwo.jdbc.url}" /> 
  <property name="user" value="${dbtwo.jdbc.user}" /> 
  <property name="password" value="${dbtwo.jdbc.password}" /> 
  <property name="initialpoolsize" value="${dbtwo.jdbc.initialpoolsize}" /> 
  <property name="minpoolsize" value="${dbtwo.jdbc.minpoolsize}" /> 
  <property name="maxpoolsize" value="${dbtwo.jdbc.maxpoolsize}" /> 
 </bean> 
 
 <bean id="dynamicdatasource" class="com.core.dynamicdatasource"> 
  <property name="targetdatasources"> 
   <map key-type="java.lang.string"> 
    <entry value-ref="datasourceone" key="datasourceone"></entry> 
    <entry value-ref="datasourcetwo" key="datasourcetwo"></entry> 
   </map> 
  </property> 
  <property name="defaulttargetdatasource" ref="datasourceone"> 
  </property> 
 </bean> 
 
 <bean id="sessionfactory" class="org.springframework.orm.hibernate4.localsessionfactorybean"> 
  <property name="datasource" ref="dynamicdatasource" /> 
  <property name="hibernateproperties"> 
   <props> 
    <prop key="hibernate.dialect">org.hibernate.dialect.mysqldialect</prop> 
    <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.springsessioncontext</prop> 
    <prop key="hibernate.show_sql">false</prop> 
    <prop key="hibernate.format_sql">true</prop> 
    <prop key="hbm2ddl.auto">create</prop> 
   </props> 
  </property> 
  <property name="packagestoscan"> 
   <list> 
    <value>com.po</value> 
   </list> 
  </property> 
 </bean> 
 
 <bean id="transactionmanager" class="org.springframework.orm.hibernate4.hibernatetransactionmanager"> 
  <property name="sessionfactory" ref="sessionfactory" /> 
 </bean> 
 
 <aop:config> 
  <aop:pointcut id="transactionpointcut" expression="execution(* com.dao..*.*(..))" /> 
  <aop:advisor advice-ref="txadvice" pointcut-ref="transactionpointcut" /> 
 </aop:config> 
 
 <tx:advice id="txadvice" transaction-manager="transactionmanager"> 
  <tx:attributes> 
   <tx:method name="add*" propagation="required" /> 
   <tx:method name="save*" propagation="required" /> 
   <tx:method name="update*" propagation="required" /> 
   <tx:method name="delete*" propagation="required" /> 
   <tx:method name="*" read-only="true" /> 
  </tx:attributes> 
 </tx:advice> 
 
 <aop:config> 
  <aop:aspect id="datasourceaspect" ref="datasourceinterceptor"> 
   <aop:pointcut id="daoone" expression="execution(* com.dao.one.*.*(..))" /> 
   <aop:pointcut id="daotwo" expression="execution(* com.dao.two.*.*(..))" /> 
   <aop:before pointcut-ref="daoone" method="setdatasourceone" /> 
   <aop:before pointcut-ref="daotwo" method="setdatasourcetwo" /> 
  </aop:aspect> 
 </aop:config> 
</beans> 

dynamicdatasource.class

package com.core; 
 
import org.springframework.jdbc.datasource.lookup.abstractroutingdatasource; 
 
public class dynamicdatasource extends abstractroutingdatasource{ 
 
 @override 
 protected object determinecurrentlookupkey() { 
  return databasecontextholder.getcustomertype(); 
 } 
 
} 

databasecontextholder.class设置数据源的类

package com.core; 
 
public class databasecontextholder { 
 
 private static final threadlocal<string> contextholder = new threadlocal<string>(); 
<span style="white-space:pre"> </span>//设置要使用的数据源 
 public static void setcustomertype(string customertype) { 
  contextholder.set(customertype); 
 } 
<span style="white-space:pre"> </span>//获取数据源 
 public static string getcustomertype() { 
  return contextholder.get(); 
 } 
<span style="white-space:pre"> </span>//清除数据源，使用默认的数据源 
 public static void clearcustomertype() { 
  contextholder.remove(); 
 } 
} 

datasourceinterceptor.class

package com.core; 
 
import org.aspectj.lang.joinpoint; 
import org.springframework.stereotype.component; 
 
@component 
public class datasourceinterceptor { 
<span style="white-space:pre"> </span>//数据源1 
 public static final string source_plan = "<span style="font-family: arial, helvetica, sans-serif;">datasourceone</span><span style="font-family: arial, helvetica, sans-serif;">";</span> 
 //数据源2 
<pre name="code" class="java"><span style="white-space:pre"> </span>public static final string source_fund = "<span style="font-family: arial, helvetica, sans-serif;">datasourcetwo</span>"; 
}

springmvc数据源

jdbc_driverclassname=com.microsoft.sqlserver.jdbc.sqlserverdriver 
<pre name="code" class="java">datasourceone<span style="font-family: arial, helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.**;databasename=db_guihua</span> 

jdbc_username=**jdbc_password=**

datasourcetwo<span style="font-family: arial, helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.*;databasename=db_fund</span> 

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

datasourcecontextholder.setdbtype(datasourcetype.source_fund);//更换数据源 

/** 
 * @classname: datasourcecontextholder 
 * @description: 数据库切换工具类 
 * @author: wzx 
 * @date: 2016-07-27 上午10:26:01 
 */ 
public class datasourcecontextholder { 
 private static final threadlocal<string> contextholder = new threadlocal<string>(); 
 
 public static void setdbtype(string dbtype) { 
  contextholder.set(dbtype); 
 } 
 
 public static string getdbtype() { 
  return ((string) contextholder.get()); 
 } 
 
 public static void cleardbtype() { 
  contextholder.remove(); 
 } 
} 

总结

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