使用Spring MVC如何實現將java項目連接兩個數據庫

發布時間：2020-11-19 16:43:47 來源：億速云閱讀：526 作者：Leah 欄目：編程語言

使用Spring MVC如何實現將java項目連接兩個數據庫？針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。

實現方法：

數據源在配置文件中的配置

<pre name="code" class="java"><&#63;xml version="1.0" encoding="UTF-8"&#63;> 
<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設置數據源的類

package com.core; 
 
public class DatabaseContextHolder { 
 
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
<span > </span>//設置要使用的數據源 
 public static void setCustomerType(String customerType) { 
  contextHolder.set(customerType); 
 } 
<span > </span>//獲取數據源 
 public static String getCustomerType() { 
  return contextHolder.get(); 
 } 
<span > </span>//清除數據源，使用默認的數據源 
 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 > </span>//數據源1 
 public static final String SOURCE_PLAN = "<span >dataSourceOne</span><span >";</span> 
 //數據源2 
<pre name="code" class="java"><span > </span>public static final String SOURCE_FUND = "<span >dataSourceTwo</span>"; 
}

springMVC數據源

jdbc_driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver 
<pre name="code" class="java">dataSourceOne<span >=jdbc:sqlserver://115.29.***.**;DatabaseName=DB_GuiHua</span>

jdbc_username=**jdbc_password=**

dataSourceTwo<span >=jdbc:sqlserver://115.29.***.*;DatabaseName=DB_Fund</span>

Spring MVC會默認有一個數據源，當需要更換數據源時，要在調用事務之前配置

DataSourceContextHolder.setDbType(DataSourceType.SOURCE_FUND);//更換數據源

/** 
 * @ClassName: DataSourceContextHolder 
 * @Description: 數據庫切換工具類 
 * @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(); 
 } 
}

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