在使用spring时,有时候需要为了模块配置方便有时候需要针对不同的模块建立不同的applicationContext的配置文件,然后在对应模块的配置文件中对相应的模块进行单独配置。
1、加载不同模块的配置文件
首先加载不同的配置文件用于针对不同的模块配置:如
applicationContext-db.xml 用于数据库相关的配置
applicationContext-interceptors.xml 用于拦截器相关的配置
applicationContext-memcached.xml 用于memcached缓存相关的配置
之后在web.xml指定添加所有指定前缀的配置,如下指定加载所有“applicationContext-”前缀的配置:
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>classpath:applicationContext-*.xml</param-value>
- </context-param>
2、加载使用它不同的properties文件
不同配置文件中加载不同的属性配置文件并属性值,如
applicationContext-db.xml 中加载jdbc.properties属性配置用于获取jdbc的相关配置信息。
applicationContext-memcached.xml 中加载memcached.properties的属性文件用于获取memcached缓存的相关配置信息。
实现上主要是使用spring提供的org.springframework.beans.factory.config.PropertyPlaceholderConfigurer bean来在不同的xml配置中加载不同的属性配置文件,否则直接使用property-placeholder加载时第二个配置文件无法成功加载,xml无法获取到相关的配置。spring加载属性文件方法如下:
- <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
- <property name="locations">
- <list>
- <value>classpath:jdbc.properties</value>
- </list>
- </property>
- <property name="ignoreUnresolvablePlaceholders" value="true" />
- </bean>
如下为applicationContext-db.xml中的完整配置,applicationContext-memcached.xml中的配指定不哦那个的classpath为不同的属性配置文件即可:
- <?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:p="http://www.springframework.org/schema/p"
- xmlns:aop="http://www.springframework.org/schema/aop"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:jee="http://www.springframework.org/schema/jee"
- xmlns:tx="http://www.springframework.org/schema/tx"
- xsi:schemaLocation="
- http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
- http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
- http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
- http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.3.xsd
- http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
- <!-- 加载数据库属性配置文件 -->
- <!-- <context:property-placeholder location="classpath:jdbc.properties" /> -->
- <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
- <property name="locations">
- <list>
- <value>classpath:jdbc.properties</value>
- </list>
- </property>
- <property name="ignoreUnresolvablePlaceholders" value="true" />
- </bean>
- <!-- dataSource configuration -->
- <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
- <property name="jdbcUrl" value="${jdbc.url}" />
- <property name="driverClass" value="${jdbc.driverClassName}" />
- <property name="user" value="${jdbc.username}" />
- <property name="password" value="${jdbc.password}" />
- <property name="minPoolSize" value="10" />
- <property name="maxPoolSize" value="100" />
- <property name="acquireIncrement" value="3" />
- <property name="maxIdleTime" value="60" />
- <property name="checkoutTimeout" value="18000" />
- <property name="idleConnectionTestPeriod" value="180" />
- </bean>
- <!-- sessionFactory configuration -->
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
- <property name="dataSource">
- <ref bean="dataSource" />
- </property>
- <property name="configLocation" value="classpath:hibernate.cfg.xml"/>
- <!-- 自动扫描注解方式配置的hibernate类文件 -->
- <property name="packagesToScan">
- <list>
- <!-- Add model package to here. -->
- <value>api.landsem.db.model</value>
- </list>
- </property>
- <property name="hibernateProperties">
- <value>
- hibernate.dialect=${hibernate.dialect}
- hibernate.query.substitutions=${hibernate.query.substitutions}
- hibernate.cache.provider_class=${hibernate.cache.provider_class}
- hibernate.hbm2ddl.auto=${hibernate.hbm2ddl.auto}
- hibernate.show_sql=${hibernate.show_sql}
- </value>
- </property>
- </bean>
- <bean id="passwordEncoder"
- class="org.springframework.security.authentication.encoding.ShaPasswordEncoder" />
- <bean id="saltSource"
- class="org.springframework.security.authentication.dao.ReflectionSaltSource">
- <property name="userPropertyToUse" value="salt" />
- </bean>
- <!-- ==============add db dao package to here===================== -->
- <context:component-scan base-package="api.landsem.db.dao.impl" />
- <!-- ======================================Transactional configuration============================================= -->
- <!-- Enable @Transactional support -->
- <tx:annotation-driven transaction-manager="transactionManager"/>
- <!-- 配置事务管理器 -->
- <bean id="transactionManager"
- class="org.springframework.orm.hibernate4.HibernateTransactionManager">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <!-- ===============Add db service package to here=================== -->
- <context:component-scan base-package="api.landsem.db.service.impl" />
- <!-- database handler. -->
- <context:component-scan base-package="api.landsem.db.handler.impl" />
- </beans>