Apache Camel框架集成Spring
Apache Camel提供了和Spring的集成,通过Spring容器(ApplicationContext)来管理Camel的CamelContext,这样的话,就不需要写代码来控制CamelContext的初始化,启动和停止了.Camel会随着Spring的启动而启动起来.本文将Apache Camel框架入门示例(http://blog.csdn.net/kkdelta/article/details/7231640)中的例子集成到Spring中,下面简单介绍一下集成的基本步骤.
1,新建一个Eclipse工程,将Spring3的jar包,和Camel的jar包配置到工程的classpath.
2,Route类要继承RouteBuilde,如下
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[*]public class FileProcessWithCamelSpring extends RouteBuilder {
[*] @Override
[*] public void configure() throws Exception {
[*] FileConvertProcessor processor = new FileConvertProcessor();
[*] from("file:d:/temp/inbox?delay=30000").process(processor).to("file:d:/temp/outbox");
[*] }
[*]}
3,Processor仍然和和入门示例的代码相同.
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[*]public class FileConvertProcessor implements Processor{
[*] @Override
[*] public void process(Exchange exchange) throws Exception {
[*] try {
[*] InputStream body = exchange.getIn().getBody(InputStream.class);
[*] BufferedReader in = new BufferedReader(new InputStreamReader(body));
[*] StringBuffer strbf = new StringBuffer("");
[*] String str = null;
[*] str = in.readLine();
[*] while (str != null) {
[*] System.out.println(str);
[*] strbf.append(str + " ");
[*] str = in.readLine();
[*] }
[*] exchange.getOut().setHeader(Exchange.FILE_NAME, "converted.txt");
[*] // set the output to the file
[*] exchange.getOut().setBody(strbf.toString());
[*] } catch (IOException e) {
[*] e.printStackTrace();
[*] }
[*] }
[*]}
4,创建一个Spring的配置文件如下:注意要将camel的xmlns加入文件中
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[*]<?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:camel="http://camel.apache.org/schema/spring"
[*] xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
[*] http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd"
[*] default-autowire="byName" default-init-method="init">
[*] <camelContext id="testCamelContext" xmlns="http://camel.apache.org/schema/spring">
[*] <package>com.test.camel</package>
[*] </camelContext>
[*]</beans>
5,启动Spring容器,Camel会自动启动,不用像入门示例那样CamelContext context = new DefaultCamelContext(), context.addRoutes(..); context.start();
ApplicationContext ac = new ClassPathXmlApplicationContext("config/cameltest.xml");
while (true) {
Thread.sleep(2000);
}
可见,Camel可以很容易的和Spring集成.
Camel还提供了"Spring DSL"来在XML中配置Route规则,不需要用JAVA类(如上面的FileProcessWithCamelSpring )来实现route.
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[*]<?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:camel="http://camel.apache.org/schema/spring"
[*] xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
[*] http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd"
[*] default-autowire="byName" default-init-method="init">
[*] <bean id="fileConverter" class="com.test.camel.FileConvertProcessor"/>
[*] <camelContext id="testCamelContext" xmlns="http://camel.apache.org/schema/spring">
[*] <route>
[*] <from uri="file:d:/temp/inbox?delay=30000"/>
[*] <process ref="fileConverter"/>
[*] <to uri="file:d:/temp/outbox"/>
[*] </route>
[*] </camelContext>
[*]</beans>
与第五步一样启动Spring容器,Camel会每隔30秒轮询一下看d:/temp/inbox是否有文件,有的话则进行处理.
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