我一直在尝试使用Apache Camel Box组件从Box下载文件。我似乎无法解释如何将必需参数output与uri box://files/downloadFile一起使用。
我可以正常上传文件（代码未列出），因此我确信这是配置此特定端点的问题，而不是例如我的org.apache.camel.component.box.BoxConfiguration。
如何使用camel-box和box://files/downloadFile下载文件？具体来说，我期望将其作为端点uri的输出参数传递？
我一直在提及此文档：
以下是我正在使用的内容：
camel-core 2.19.3，camel-box 2.19.3，camel-spring-javaconfig 2.19.3
这是我无法弄清楚的路线BoxRoute.java：
package [REDACTED];
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
public class BoxRoute extends RouteBuilder{
private static final Logger LOG = LoggerFactory.getLogger(BoxRoute.class);
@Override
public void configure() throws Exception {
from("box://files/downloadFile?fileId=[REDACTED]&output=#outputStream") //I expect this to refer to the outputStream @Bean
.process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
for(String key: exchange.getProperties().keySet()){
LOG.debug("ex prop {} = {}", key, exchange.getProperty(key));
}
for(String key: exchange.getIn().getHeaders().keySet()){
LOG.debug("he prop {} = {}", key, exchange.getIn().getHeader(key));
}
}
})
.to("file:c:/_/dat/camel/out");
}
}
所以我想我给这个uri它需要什么。也就是说，对我的outputStream的引用是OutputStream，在下一个清单中定义。
我的应用程序的主要方法是BoxApplication.java：
package [REDACTED];
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import org.apache.camel.spring.javaconfig.CamelConfiguration;
import org.apache.camel.spring.javaconfig.Main;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
@Configuration
@ComponentScan
@ImportResource("classpath:/META-INF/spring/box-context.xml")
public class BoxApplication extends CamelConfiguration{
public static void main(String[] args) throws Exception {
Main main = new Main();
main.setConfigClass(BoxApplication.class);
main.setDuration(10);
main.run();
}
@Bean()
public OutputStream outputStream(){
System.out.println("I AM GETTING REGISTERED"); // I see this in stdout, so this bean is available to Camel (right?)
return new ByteArrayOutputStream();
}
}
box-context.xml的内容是（我可以使用骆驼盒上传，所以我怀疑我的问题在这里）：
?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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<bean id="box" class="org.apache.camel.component.box.BoxComponent">
<property name="configuration">
<bean class="org.apache.camel.component.box.BoxConfiguration">
<property name="userName" value="[REDACTED]" />
<property name="userPassword" value="[REDACTED]" />
<property name="clientId" value="[REDACTED]" />
<property name="clientSecret" value="[REDACTED]" />
<property name="authenticationType" value="STANDARD_AUTHENTICATION" />
</bean>
</property>
</bean>
唉，我收到了这个错误，我很难过。任何帮助将不胜感激。
2017-10-07 18:05:00.128 [main] INFO o.s.c.a.AnnotationConfigApplicationContext(583) - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@bd8db5a: startup date [Sat Oct 07 18:05:00 EDT 2017]; root of context hierarchy
2017-10-07 18:05:00.216 [main] INFO o.s.b.f.xml.XmlBeanDefinitionReader(317) - Loading XML bean definitions from class path resource [META-INF/spring/box-context.xml]
2017-10-07 18:05:00.500 [main] INFO o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker(325) - Bean 'boxApplication' of type [com.hqcllc.box.BoxApplication$$EnhancerBySpringCGLIB$$4e7e4dfa] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
I AM GETTING REGISTERED
Exception in thread "main" org.apache.camel.spring.javaconfig.CamelSpringJavaconfigInitializationException: org.apache.camel.RuntimeCamelException: Error invoking downloadFile with {output=, listener=Consumer[box://files/downloadFile?fileId=[REDACTED]&output=%23outputStream], fileId=[REDACTED]}: object is not an instance of declaring class
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:88)
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:33)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.apache.camel.spring.javaconfig.Main.createDefaultApplicationContext(Main.java:148)
at org.apache.camel.spring.Main.doStart(Main.java:154)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.main.MainSupport.run(MainSupport.java:168)
at com.hqcllc.box.BoxApplication.main(BoxApplication.java:22)
Caused by: org.apache.camel.RuntimeCamelException: Error invoking downloadFile with {output=, listener=Consumer[box://files/downloadFile?fileId=[REDACTED]&output=%23outputStream], fileId=[REDACTED]}: object is not an instance of declaring class
at org.apache.camel.util.component.ApiMethodHelper.invokeMethod(ApiMethodHelper.java:514)
at org.apache.camel.component.box.BoxConsumer.doStart(BoxConsumer.java:98)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.impl.DefaultCamelContext.startService(DefaultCamelContext.java:3514)
at org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRouteConsumers(DefaultCamelContext.java:3831)
at org.apache.camel.impl.DefaultCamelContext.doStartRouteConsumers(DefaultCamelContext.java:3767)
at org.apache.camel.impl.DefaultCamelContext.safelyStartRouteServices(DefaultCamelContext.java:3687)
at org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:3451)
at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:3305)
at org.apache.camel.impl.DefaultCamelContext.access$000(DefaultCamelContext.java:202)
at org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:3089)
at org.apache.camel.impl.DefaultCamelContext$2.call(DefaultCamelContext.java:3085)
at org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:3108)
at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:3085)
at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:3022)
at org.apache.camel.spring.javaconfig.RoutesCollector.onApplicationEvent(RoutesCollector.java:84)
... 12 more
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.camel.util.component.ApiMethodHelper.invokeMethod(ApiMethodHelper.java:506)
... 28 more
这是我的第一个骆驼项目。