属性占位符

{{file.uri}}

cool.end = mock:result
where = cheese

from("direct:start")
    .to("{{cool.end}}");

<route>
  <from uri="direct:start"/>
  <to uri="{{cool.end}}"/>
</route>

buf = 8192

from("direct:start")
    .to("file:outbox?bufferSize={{buf}}");

<route>
  <from uri="direct:start"/>
  <to uri="file:outbox?bufferSize={{buf}}"/>
</route>

from("direct:start")
    .to("mock:{{where}}");

Optional<String> prop = camelContext.getPropertiesComponent().resolveProperty("foo");
if (prop.isPresent()) {
    String value = prop.get();
    ....
}

String msg = camelContext.resolvePropertyPlaceholders("{{greeting}} Camel user, Camel is {{cool}} dont you think?");

greeting = Hi
cool = awesome

Hi Camel user, Camel is awesome dont you think?

<multicast stopOnException="{{stop}}">
   ...
</multicast>

<multicast prop:stopOnException="stop">
  ...
</multicast>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:prop="http://camel.apache.org/schema/placeholder"
       xsi:schemaLocation="
           http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
           http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

    <bean id="damn" class="java.lang.IllegalArgumentException">
        <constructor-arg index="0" value="Damn"/>
    </bean>

    <camelContext xmlns="http://camel.apache.org/schema/spring">
        <propertyPlaceholder id="properties" location="classpath:myprop.properties"/>
        <route>
            <from uri="direct:start"/>
            <!-- use prop namespace, to define a property placeholder, which maps to option stopOnException={{stop}} -->
            <multicast prop:stopOnException="stop">
                <to uri="mock:a"/>
                <throwException ref="damn"/>
                <to uri="mock:b"/>
            </multicast>
        </route>
    </camelContext>
</beans>

stop = true

<!-- bridge spring property placeholder with Camel -->
<!-- you must NOT use the <context:property-placeholder at the same time, only this bridge bean -->
<bean id="bridgePropertyPlaceholder" class="org.apache.camel.spring.spi.BridgePropertyPlaceholderConfigurer">
  <property name="location" value="classpath:org/apache/camel/component/properties/cheese.properties"/>
</bean>

<!-- a bean that uses Spring property placeholder -->
<!-- the ${hi} is a spring property placeholder -->
<bean id="hello" class="org.apache.camel.component.properties.HelloBean">
  <property name="greeting" value="${hi}"/>
</bean>

<camelContext xmlns="http://camel.apache.org/schema/spring">
  <!-- in this route we use Camels property placeholder {{ }} style -->
  <route>
    <from uri="direct:{{cool.bar}}"/>
    <bean ref="hello"/>
    <to uri="{{cool.end}}"/>
  </route>
</camelContext>

<camelContext>
    <route>
        <from uri="direct:start"/>
        <to uri="{{env:SOMENAME}}"/>
        <to uri="{{sys:MyJvmPropertyName}}"/>
    </route>
</camelContext>

<camelContext>
    <route>
        <from uri="direct:start"/>
        <to uri="{{env:SOMENAME:log:foo}}"/>
        <to uri="{{sys:MyJvmPropertyName:log:bar}}"/>
    </route>
</camelContext>

export $FOO_SERVICE_HOST=myserver
export $FOO_SERVICE_PORT=8888

<camelContext>
    <route>
        <from uri="direct:start"/>
        <to uri="http://{{service:FOO}}/myapp"/>
    </route>
</camelContext>

<camelContext>
<route>
    <from uri="direct:start"/>
    <to uri="http://{{service:FOO:localhost:8080}}/myapp"/>
</route>
</camelContext>

<camelContext>
<route>
    <from uri="file:{{bean:foo.bar}}"/>
    <to uri="direct:result"/>
</route>
</camelContext>

PropertiesComponent pc = context.getPropertiesComponent();
pc.addPropertiesSource(myPropertySource);