Apache Camel框架集成Spring

szs

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

[java] view plaincopy

• 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.

[java] view plaincopy

• 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.
[html] view plaincopy

• <?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.