我通过Java将JAXB对象发送到Rabbit MQ。
JAXBContext jaxbContext = JAXBContext.newInstance(MyDTO.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
java.io.StringWriter sw = new StringWriter();
jaxbMarshaller.marshal(deliveryrequest, sw);
ConnectionFactory factory = new ConnectionFactory() ;
//TODO change the hardcoding to the properties file
factory.setHost("rabbitmq.host.net");
factory.setUsername("user");
factory.setPassword("pass");
Channel channel ;
Connection connection;
Map<String, Object> args = new HashMap<String, Object>();
String haPolicyValue = "all";
args.put("x-ha-policy", haPolicyValue);
connection = factory.newConnection();
channel = connection.createChannel();
//TODO change the hardcoding to the properties file
channel.queueDeclare("upload.com.some.queue", true, false, false, args);
//TODO change the hardcoding to the properties file
channel.basicPublish("com.some.exchange", "someroutingKey",
new AMQP.BasicProperties.Builder().contentType("text/plain")
.deliveryMode(2).priority(1).userId("guest").build(),
sw.toString().getBytes());
我在不同的应用程序中使用Camel来阅读它。
<camel:route id="myRoute">
<camel:from uri="RabbitMQEndpoint" />
<camel:to uri="bean:MyHandler" />
</camel:route>
处理程序正在使用骆驼侧重做的Jaxb对象
@Handler
public void handleRequest(MyDTO dto) throws ParseException {
我收到的错误是我没想到的。
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: byte[] to the required type: com.mycompany.MyDTO with value [B@1b8d3e42
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:181)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:99)
感谢您的解决方案。
答案 0 :(得分：3)
来自rabbit的邮件正文类型是一个byte []，并且您想要调用一个作为MyDTO类型的bean。您的类型不匹配。并且Camel找不到可以将消息体从byte []转换为MyDTO类型的类型转换器。
Rabbit的byte []数据是否为XML格式？你是否在MyDTO类上有JAXB注释，所以你可以使用JAXB来编组从xml到Java的那些？
答案 1 :(得分：1)
是Jaxb对象。我的印象是，如果我移动出版商太骆驼。事情将被整理出来。
我将发布商更改为以下内容。
@EndpointInject(context = "myContext" , uri = "direct:myRoute")
private ProducerTemplate sendAMyContext;
在方法中我打电话
@Override
public MyResponse putMyCall(
MyRequest myrequest) {
sendMyContext.sendBody(myrequest);
我的骆驼路线很简单
<camel:camelContext id="MyContext" autoStartup="true" xmlns="http://camel.apache.org/schema/spring">
<camel:endpoint id="myQueue" uri="${my.queue.1}" />
<camel:route>
<camel:from uri="direct:myRoute"/>
<camel:to uri="bean:mySendHandler"/>
<camel:convertBodyTo type="String"></camel:convertBodyTo>
<camel:to uri="ref:myQueue" />
</camel:route>
</camel:camelContext>
我添加了将Jaxb对象转换为字符串的处理程序（因为错误）
public class MySendHandler {
@Handler
public String myDelivery( MyRequest myRequest) throws ParseException, JAXBException {
JAXBContext jaxbContext = JAXBContext.newInstance(MyRequest.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
// output pretty printed
jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
java.io.StringWriter sw = new StringWriter();
jaxbMarshaller.marshal(attributedDeliveryRequest, sw);
return sw.toString();
}
仍然是同样的错误
[SpringAMQPConsumer.SpringAMQPExecutor-1] WARN org.springframework.amqp.support.converter.JsonMessageConverter (JsonMessageConverter.java:111) - Could not convert incoming message with content-type [text/plain]
SpringAMQPConsumer.SpringAMQPExecutor-1] ERROR org.apache.camel.processor.DefaultErrorHandler (MarkerIgnoringBase.java:161) - Failed delivery for (MessageId: ID-Con ExchangeId: ID-65455-1380873539452-3-2).
Exhausted after delivery attempt: 1 caught: org.apache.camel.CamelExecutionException: Exception occurred during execution on the exchange: Exchange[Message: <XML>]
org.apache.camel.CamelExecutionException: Exception occurred during execution on the exchange: Exchange[Message: <xml>
.....
Caused by: org.apache.camel.InvalidPayloadException: No body available of type: MyDTO but has value: [B@7da255c of type: byte[] on: Message: <xml>
. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: byte[] to the required type: MyDeliveryDTO with value [B@7da255c]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:101)
at org.apache.camel.builder.ExpressionBuilder$38.evaluate(ExpressionBuilder.java:934)
... 74 more
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: byte[] to the required type: MyDTO with value [B@7da255c
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:181)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:99)
... 75 more
我收到的骆驼路线如下
<camel:route id="processVDelivery">
<camel:from uri="aVEndpoint" />
<camel:to uri="bean:myDataHandler" />
</camel:route>
我添加了
<camel:convertBodyTo type="String"></camel:convertBodyTo>
它给了我错误，它无法将它从字符串转换为对象
添加此
<camel:unmarshal></camel:unmarshal>
-------------------------
问题的答案将是你的所有mashaller必须成为classpath的一部分
---------------------------------
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-jaxrs</artifactId>
<version>${jackson.version}</version>
</dependency>
-------您也可以使用dataformat
进行自定义编组<camel:dataFormats>
<camel:jaxb id="name" contextPath="com.something"/>
</camel:dataFormats
确保将com.something包中的jaxb.index文件与根级别Jaxb对象名称保存在一起