두 개의 데이터베이스에 동시에 연결되는 Java 프로젝트를 구현하기 위해 Spring의 MVC에서 이중 데이터 소스를 구성하는 방법-java지도 시간-php.cn

본 글에서는 Spring MVC가 듀얼 데이터소스를 구성하여 두 개의 데이터베이스를 동시에 연결하는 자바 프로젝트를 구현하는 방법에 대한 관련 내용을 주로 소개하고 있으며, 샘플 코드를 통해 자세히 소개하고 있다. 이는 모든 사람에게 큰 도움이 됩니다. 이는 특정 참고 자료와 학습 가치가 있습니다. 필요한 친구는 아래를 살펴볼 수 있습니다.

머리말

이 글에서는 두 데이터베이스를 동시에 연결하는 자바 프로젝트를 구현하기 위해 Spring MVC로 듀얼 데이터소스를 구성하는 방법을 주로 소개한다. 시간나셔서 참고하시고 공부해보세요:

구현방법:

데이터 소스는 구성 파일

<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>

로그인 후 복사

DynamicDataSource.class

package com.core; 
 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
 
public class DynamicDataSource extends AbstractRoutingDataSource{ 
 
 @Override 
 protected Object determineCurrentLookupKey() { 
  return DatabaseContextHolder.getCustomerType(); 
 } 
 
}

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DatabaseContextHolder.class의 구성에 있습니다. 데이터 소스 클래스

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(); 
 } 
}

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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>"; 
}

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springMVC 데이터 소스

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>

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jdbc_username=**jdbc_password=**

dataSourceTwo<span style="font-family: Arial, Helvetica, sans-serif;">=jdbc:sqlserver://115.29.***.*;DatabaseName=DB_Fund</span>

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Spring MVC에는 기본적으로 데이터 소스가 있습니다. 데이터 소스를 변경해야 하는 경우 이를 구성해야 합니다.

rreeerrree

요약

위 내용은 두 개의 데이터베이스에 동시에 연결되는 Java 프로젝트를 구현하기 위해 Spring의 MVC에서 이중 데이터 소스를 구성하는 방법의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!