我如何才能获得所有的属性与前缀'abc'。从PropertyPlaceholderConfigurer

Question

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>a.properties</value>
            <value>b.properties</value>
            <value>c.properties</value>
        </list>
    </property>
</bean>

abc.hibernate.show_sql=true
abc.hibernate.default_schema=myschema
abc.hibernate.xxx=xxx
abc.hibernate.xxx=xxx
abc.hibernate.xxx=xxx
abc.hibernate.xxx=xxx
abc.hibernate.xxx=xxx
abc.hibernate.xxx=xxx

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <util:properties>
            <prop key="hibernate.show_sql">${abc.hibernate.show_sql}</prop>
            <prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>
            <prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>
            <prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>
            <prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>
            <prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>
        </util:properties>
    </property>
</bean>

<prop key="hibernate.xxx">${abc.hibernate.xxx}</prop>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <something prefix="abc" /> <!-- TODO -->
    </property>
</bean>

这是可能的还是有其他简单的解决办法？

Answer 1

可以使用以下类来扩展java.util.properties：

import java.util.Enumeration;
import java.util.Properties;

public class PrefixedProperties extends Properties {
    public PrefixedProperties(Properties props, String prefix){
        if(props == null){
            return;
        }

        Enumeration<String> en = (Enumeration<String>) props.propertyNames();
        while(en.hasMoreElements()){
            String propName = en.nextElement();
            String propValue = props.getProperty(propName);

            if(propName.startsWith(prefix)){
                String key = propName.substring(prefix.length());
                setProperty(key, propValue);
            }
        }
    }    
}

然后您可以如下定义sessionFactory：

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="hibernateProperties">
        <bean id="sessionFactoryProperties" class="PrefixedProperties">
            <constructor-arg ref="props"/> <!-- reference to all properties -->
            <constructor-arg value="abc.hibernate."/> <!-- prefix -->
        </bean>
    </property>
</bean>

我看不到任何其他筛选属性的可能性。