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

本文主要介绍的是关于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，分享出来供大家参考学习，下面来看看详细的介绍：

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

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对我们的支持。