java Spring PropertyPlaceholderConfigurer 从 DB 加载
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Spring PropertyPlaceholderConfigurer load from DB
提问by Ahmet Karakaya
Is it possible to load properties from DB with Custom Spring PropertyPlaceholderConfigurer? and is it also possible that datasource provided to custom PropertyPlaceholderConfigurer use specific property file in classpath?
是否可以使用自定义 Spring PropertyPlaceholderConfigurer 从 DB 加载属性？提供给自定义 PropertyPlaceholderConfigurer 的数据源是否也有可能在类路径中使用特定的属性文件？
I could not find satisfied answer from following links?
我无法从以下链接中找到满意的答案？
http://www.mkyong.com/spring/spring-propertyplaceholderconfigurer-example/http://www.codeproject.com/Articles/28893/Loading-Application-Properties-from-a-DatabasePropertyPlaceholderConfigurer to look for DB values and use properties file as fallback
http://www.mkyong.com/spring/spring-propertyplaceholderconfigurer-example/ http://www.codeproject.com/Articles/28893/Loading-Application-Properties-from-a-Database PropertyPlaceholderConfigurer 寻找 DB 值和使用属性文件作为后备
回答by Ahmet Karakaya
Spring Context XML
Spring 上下文 XML
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="ignoreUnresolvablePlaceholders" value="true"/>
<property name="ignoreResourceNotFound" value="false"/>
<property name="order" value="1" />
<property name="locations">
<list>
<value>classpath:db.properties</value>
</list>
</property>
</bean>
<bean id="dataSourceimos" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass"><value>${imosdb.driver}</value></property>
<property name="jdbcUrl"><value>${imosdb.url}</value></property>
<property name="user"><value>${imosdb.username}</value></property>
<property name="password"><value>${imosdb.password}</value></property>
<property name="initialPoolSize"><value>${imosdb.initial_pool_size}</value></property>
<property name="maxPoolSize"><value>${imosdb.max_pool_size}</value></property>
<property name="minPoolSize"><value>${imosdb.min_pool_size}</value></property>
<property name="acquireIncrement" value="1"/>
<property name="acquireRetryAttempts" value="1"/>
<property name="idleConnectionTestPeriod" value="30"/>
<property name="preferredTestQuery" value="select 1 from dual"/>
<property name="checkoutTimeout" value="5000"/>
<property name="maxAdministrativeTaskTime" value="120"/>
<property name="numHelperThreads" value="10"/>
</bean>
<bean
class="com.ahmetk.property.DbPropertySourcesPlaceholderConfigurer">
<property name="ignoreUnresolvablePlaceholders" value="true"/>
<property name="ignoreResourceNotFound" value="true"/>
<property name="order" value="2" />
<property name="placeholderPrefix" value="${" />
<property name="placeholderSuffix" value="}" />
<property name="dataSourceName" value="dataSourceimos" />
<property name="locations">
<list>
<value>classpath:static.properties</value>
<value>file:static.properties</value>
</list>
</property>
</bean>
<context:component-scan base-package="com.mkyong.rest" />
<bean id="transactionBo" class="com.mkyong.transaction.impl.TransactionBoImpl" />
<bean id="cacheServiceInterface" class="com.ttech.tims.imos.data.cache.CacheServiceImpl" />
<bean id="iCacheService" class="com.ttech.tims.imos.data.cache.impl.CacheService" />
</beans>
Java PlaceholderClass
Java占位符类
import java.util.Properties;
import javax.sql.DataSource;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
public class DbPropertySourcesPlaceholderConfigurer extends PropertyPlaceholderConfigurer
{
private static final String DEFAULT_DATASOURCENAME = "dataSource";
private static final String DEFAULT_DBTABLENAME = "property";
private static final String DEFAULT_DBKEYCOLUMNNAME = "key";
private static final String DEFAULT_DBVALUECOLUMNNAME = "value";
String dataSourceName;
String dbTableName;
String dbKeyColumnName;
String dbValueColumnName;
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
{
DataSource dataSource = (DataSource) beanFactory.getBean(getDataSourceName());
// DbProperties dbProps = new DbProperties(dataSource);
final Properties dbProps = new Properties();
dbProps.put("app.version", "v3");
setProperties(dbProps);
super.postProcessBeanFactory(beanFactory);
}
public String getDataSourceName() {
return dataSourceName==null?DEFAULT_DATASOURCENAME:dataSourceName;
}
public void setDataSourceName(String dataSourceName) {
this.dataSourceName = dataSourceName;
}
}
Special thanks to writer of following pages.
特别感谢以下页面的作者。
http://ykchee.blogspot.com.tr/2012/09/spring-31-loading-properties-for-xml.html
http://ykchee.blogspot.com.tr/2012/09/spring-31-loading-properties-for-xml.html
http://blog.javaforge.net/post/31720600427/configuring-spring-based-web-application-from-database
http://blog.javaforge.net/post/31720600427/configuring-spring-based-web-application-from-database
