This document explains how to consume a weather web service using Mule's web service consumer component. It details setting a zip code payload, using a data mapper to map this to the web service request, invoking the web service, and transforming the XML response to a POJO object and then to JSON to return in the response. The main flow uses a set payload component to set the zip code, data mappers to prepare the request and transform the response, a web service consumer to invoke the weather service, and transforms the final response to JSON.

1. Web Service Invocation in Mule
This Tutorial explains how to consume a
webservice using mule Web Service Consumer.
Pre-requisites:
● Anypoint Studio
● Weather Web Service

2. In the below flow I am setting the city zip code as payload in
“Set Payload” Component.
DataMapper component maps this value to the Weather
Webservice Operation “GetCityForecastByZip” Request xml
Field as “ZIP”.
Webservice Consumer component calls the Weather Web
Service to fetch the “GetCityForecastByZipResponse”.
The Next DataMapper Transforms the XML to POJO Object
i.e. GetCityForecastByZipResponse (Used for testing purpose
only, Can be removed).
Finally GetCityForecastByZipResponse Java Object will be
transformed to JSON String and given as response to Http
Component.
Which gives the City Weather Information

3. Main Flow

4. Http Component Configuration

5. Set Payload Component
Configuration

6. DataMapper to prepare Web
Service Request

7. Web Service Consumer
Configuration

8. Web Service Configuration

9. DataMapper to Transform
Webservice Response to POJO
Configuration

11. Main Flow Source
<ws:consumer-config name="Web_Service_Consumer" wsdlLocation="Weather.wsdl"
service="Weather" port="WeatherSoap12"
serviceAddress="http://wsf.cdyne.com/WeatherWS/Weather.asmx" doc:name="Web
Service Consumer"/>
<!-- <mulexml:namespace-manager includeConfigNamespaces="true">
<mulexml:namespace prefix="wet" uri="http://ws.cdyne.com/WeatherWS/"/>
</mulexml:namespace-manager> -->
<configuration doc:name="Configuration">
<expression-language autoResolveVariables="true">
<import name="poc" class="com.poc.PocUtil"/>
<global-functions>
def changeState(){ return poc.changeState() }
</global-functions>
</expression-language>
</configuration>
<data-mapper:config name="JSON_To_Xml_GetCityWeatherByZIP_"
transformationGraphPath="json_to_xml_getcityweatherbyzip_.grf"
doc:name="JSON_To_Xml_GetCityWeatherByZIP_"/> <data-mapper:config
name="JSON_To_Xml_GetCityForecastByZIP_"
transformationGraphPath="json_to_xml_getcityforecastbyzip_.grf"
doc:name="JSON_To_Xml_GetCityForecastByZIP_"/>

12. <data-mapper:config name="Xml_GetCityForecastByZIPResponse__To_Pojo"
transformationGraphPath="xml_getcityforecastbyzipresponse__to_pojo.grf"
doc:name="Xml_GetCityForecastByZIPResponse__To_Pojo"/>
<flow name="webservicepocFlow2" doc:name="webservicepocFlow2">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost"
port="8082" doc:name="HTTP"/>
<set-payload value="{&quot;zipcode&quot;:&quot;00501&quot;}" doc:name="Set
Payload"/>
<data-mapper:transform config-ref="JSON_To_Xml_GetCityForecastByZIP_"
doc:name="JSON To Xml&lt;GetCityForecastByZIP&gt;"/>
<ws:consumer config-ref="Web_Service_Consumer" operation="GetCityForecastByZIP"
doc:name="Web Service Consumer"/>
<data-mapper:transform config-ref="Xml_GetCityForecastByZIPResponse__To_Pojo"
doc:name="Xml&lt;GetCityForecastByZIPResponse&gt; To Pojo">
<data-mapper:input-arguments>
</data-mapper:input-arguments>
</data-mapper:transform>
<logger message="#[payload.getCity()]" level="INFO" doc:name="Logger"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
</flow>