ESB MULE passing the parameters to the java method

问题

I use MULE version 3.3.0 CE, I want to get some value from header in inbound and then pass it to a java method, in java method making some changes on passed value, finally again I pass it from java method to the outbound????

回答1:

Instead of tying your Java beans to the Mule API (with Callable), you can do this using MEL only, for example with:

<invoke object-ref="yourBean"
        method="yourMethod"
        methodArguments="#[message.inboundProperties['inboundPropertyName']]" />

<set-property propertyName="outboundPropertyName"
              value="#[payload]" />

This has the caveat that the message payload is affected by the invoke element. If this is a problem then you can go with:

<expression-component>
    propVal = app.registry.yourBean.yourMethod(message.inboundProperties['inboundPropertyName']);
    message.outboundProperties['outboundPropertyName'] = propVal;
</expression-component>

回答2:

1. Make your Java component implement org.mule.api.lifecycle.Callable

2. In its onCall you can get the message as follows:

   MuleMessage message = eventContext.getMessage();

3. Now you can obtain the inbound properties:

   Object someProp = message.getInboundProperty("some_prop_name");

4. After operating over it, you place it back as an outbound property:

   message.setOutboundProperty("some_prop_name", someProp);

来源：https://stackoverflow.com/questions/15223807/esb-mule-passing-the-parameters-to-the-java-method