Apache Camel-从文件读取JDBC数据源属性

Question

i'm using Apache Camel and i try to load datasource properties from this file

config.properties:

url = my_url
user = user_name
password = user_pass

this is dataSource ( blueprint.xml ):

<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
      <property name="URL" value="my_url"/>
      <property name="user" value="user_name"/>
      <property name="password" value="user_pass"/>
  </bean> 

How can i read values from config.properties and insert them into dataSource properties ?

Answer 1

You talk about blueprint.xml, and camel, so I assume you are in an osgi container like Karaf/ServiceMix, and you are using Aries Blueprint.

Then you can use the cm namespace and a property-placeholder . If you use camel and want your properties to be dynamically reloaded, then you can use too an update strategy reload , which start/stop the blueprint container when the configuration change. This will load the configuration with pid "datasource" (ie, in karaf, the file etc/datasource.cfg ) :

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.2.0"
           xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.2.0">

  <cm:cm-properties id="myProps" persistent-id="datasource" update-strategy="reload"/>

  <bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
      <property name="URL" value="${url}"/>
      <property name="user" value="${user}"/>
      <property name="password" value="${password}"/>
  </bean> 
</blueprint>

If you want to use your configuration file without using ConfigurationAdmin or dynamically reload your bundle, then you can use the ext namespace :

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.2.0">

    <ext:property-placeholder>
        <ext:location>file:config.properties</ext:location>
    </ext:property-placeholder>

    <bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
          <property name="URL" value="${url}"/>
          <property name="user" value="${user}"/>
          <property name="password" value="${password}"/>
     </bean> 
</blueprint>

Answer 2

According to code I assume you use probably spring as container. General solution in spring is to use PropertyPlaceHolder, your configuration will look like this:

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location">
        <value>config.properties</value>
    </property>
</bean>

<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
  <property name="URL" value="${jdbc.myUrl}"/>
  <property name="user" value="${jdbc.user_name}"/>
  <property name="password" value="${jdbc.user_pass}"/>
</bean> 

Please check the example for details.