问题
I have almost ready application in java that use jms with Camel. Pop up that we I have to add additional infomations in exchange/message. Lets say that those additional infomations are in fact new java object. What is the best way to add my new object to exchange?
I have a lot of Camel processors processing the message that look like this:
public class MyProcessor implements Processor {
@Override
public void process(Exchange exchange) throws Exception {
String s = exchange.getIn().getBody(String.class);
s = magicalTransform(s);
exchange.getIn().setBody(s, String.class);
//Now I have to add object of some Info.cass:
Info info = new Info( new Date() );
//Can I add it like this? :
exchange.getIn().setBody(info, Info.class);
}
}
The problem is that I can't find information if I can add many objects to Message. The Message method: setBody(Object body, Class type) suggest that it is possible, but there is also method: getBody() that sugesst that there is only one body class.
If I can't do it in this way, then what's the best way? I could try to wrap String that I transform and info in to one class, and put that new class in to message, but It will cause change the way obtaining String in every Processor. I want to avoid that.
回答1:
The body of an Exchange is a single Object. If you want to add multiple objects to the body of your exchange you need to make the body of the exchange a map, list, or pojo with fields that you set all of your objects within.
来源：https://stackoverflow.com/questions/17469762/apache-camel-can-message-have-multiple-objects-in-body-with-different-classes