camel Direct and import the routes from another XML file

接着前面前面的camel web 章程，本章程主要介绍 Direct，seda，和 routes的xml导入（import）。

建议在阅读该文时参阅笔者前两篇博客

apache camel jetty to http

using Camel in a Web Application

先来简单的，direct (点击进入官网)和 how do import routes from other xml file （点击进入官网）

比如我们需要大量的 xml配置route，但是同时出现在applicationContext文件中有非常庞大，臃肿，多人维护有容易冲突。那么解决该问题的一个办法就是根据业务，或者其他类别，把各个route配置到别的xml文件，在applicationContext中import，然后使用。（如果你使用的不是 xml 配置路由，选择通过代码编码route，camel 有一个org.apache.camel.spring.config.scan.route的包可以自动扫描代码中 继承RouteBuilder 自动加载路由，不过个人觉得那样路由规则都在代码中编码，如路由还需要重新编译极为不便，所以我选择 xml配置的方式）

routes import 十分简单，笔者就直接贴官网原文

For example we could have a file namedmyCoolRoutes.xmlwhich contains a couple of routes as shown:

Then in your XML file which contains the CamelContext you can use Spring to import themyCoolRoute.xmlfile.
And then inside<camelContext/>you can refer to the<routeContext/>by its id as shown below:

Also notice that you can mix and match,having routes inside CamelContext and also externalized in RouteContext.

You can have as many<routeContextRef/>as you like.

官方介绍

component provides direct,synchronous invocation of any consumers when a producer sends a message exchange.
This endpoint can be used to connect existing routes in thesamecamel context.

我们就理解最后一句 ，endpoint（当前配置的route） 可以连接（调用）camel上已经配置好的routes。

有种组合拳的感觉。不过既然可以调用已经存在的，那再配置的时候就要避免 相互调用，route1 to:/direct:route2 . route2 to:/diect:route1.(这是一个错误的示范)

理解了上面这点。那么在使用的时候就会顺手很多

我就直接贴入我在实践是用的 camelRoute1.xml(other route)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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="myReviveProcess" class="com.smart.fulfilcamel.reviveProcess"/>-->
 <bean id="coolReviveProcess" class="com.smart.fulfilcamel.reviveProcess"/>
    <!-- this is an included XML file where we only the the routeContext -->
    <routeContext id="myCoolRoutes" xmlns="http://camel.apache.org/schema/spring">
        <!-- we can have a route -->
        <route id="cool">
            <from uri="jetty:http://localhost:8777/FulfilCamel/cool?sessionSupport=true"/>
            <to uri="direct:bar"/>
        </route>
        <!-- and another route,you can have as many your like -->
        <route id="bar">
            <from uri="direct:bar"/>
            <removeHeaders pattern="CamelHttp*"/>
            <process ref="coolReviveProcess"/>
            <to uri="http://localhost:8007/FulfilCamel/fulfil"/>
        </route>
    </routeContext>
 
</beans>

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-2.5.xsd
       http://camel.apache.org/schema/spring 
       http://camel.apache.org/schema/spring/camel-spring.xsd">
    
    <bean id="myReviveProcess" class="com.smart.fulfilcamel.reviveProcess"/>
    
    <!-- import the routes from another XML file -->
    <import resource="camelRoute1.xml"/>
 
    <camelContext id="testOne" xmlns="http://camel.apache.org/schema/spring">
        
        <!-- refer to a given route to be used -->
        <routeContextRef ref="myCoolRoutes"/>
        
        <route>
            <from uri="jetty:http://localhost:8777/FulfilCamel/revive?sessionSupport=true"/>
            <removeHeaders pattern="CamelHttp*" />
            <process ref="myReviveProcess"/>
            <to uri="http://localhost:8007/FulfilCamel/fulfil"/>
        </route>
    </camelContext>
</beans>

上面哪里有什么不明白的，请参阅笔者前两篇博客

using Camel in a Web Application

下面 direct 的options，

后续文件 披露 seda

（编辑：李大同）

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