This guide walks you through the process of consuming a SOAP-based web service with Spring.
What you’ll build
You will build a client that fetches weather data from a remote, WSDL-based web service using SOAP. You can find out more about the quote service at http://www.webservicex.com/stockquote.asmx?op=GetQuote.
The service provides stock market quotes. You will be able to use your own ticker symbol.
What you’ll need
|If you read Producing a SOAP web service, you might be wondering why this guide doesn’t use spring-boot-starter-ws? That Spring Boot starter is only for server-side web services. That starter brings on board things like embedded Tomcat, which isn’t need to make a web call.|
Generate domain objects based on a WSDL
The interface to a SOAP web service is captured in a WSDL. JAXB provides an easy means to generate Java classes from a WSDL (or rather: the XSD contained in the
<Types/> section of the WSDL).
The WSDL for the quote service can be found at http://www.webservicex.com/stockquote.asmx?WSDL.
To generate Java classes from the WSDL in maven, you need the following plugin setup:
This setup will generate classes for the WSDL found at the specified URL, putting those classes in the
To do the same with gradle, you will need the following in your build file:
As gradle does not have a JAXB plugin (yet), it involves an ant task, which makes it a bit more complex than in maven.
In both cases, the JAXB domain object generation process has been wired into the build tool’s lifecycle so there are no extra steps to run.
Create a weather service client
To create a web service client, you simply have to extend the WebServiceGatewaySupport class and code your operations:
The client contains one method:
getQuote which does the actual SOAP exchange.
In this method, both the
GetQuote and the
GetQuoteResponse classes are derived from the WSDL and were generated in the JAXB generation process described in the previous step.
It creates the
GetQuote request object and sets it up with the
After printing out the ticker code, it uses the WebServiceTemplate supplied by the
WebServiceGatewaySupport base class to do the actual SOAP exchange.
It passes the
GetQuote request object, as well as a
SoapActionCallback to pass on a SOAPAction header with the request, as the WSDL described that it needed this header in the
It casts the response into a
GetQuoteResponse object, which is then returned.
Configuring web service components
Spring WS uses Spring Framework’s OXM module which has the
Jaxb2Marshaller to serialize and deserialize XML requests.
marshaller is pointed at the collection of generated domain objects and will use them to both serialize and deserialize between XML and POJOs.
quoteClient is created and configured with the URI of the weather service shown up above. It is also configured to use the JAXB marshaller.
Make the application executable
This application is packaged up to run from the console and retrieve a single weather forecast for a given zip code.
main() method defers to the
SpringApplication helper class, providing
QuoteConfiguration.class as an argument to its
run() method. This tells Spring to read the annotation metadata from
QuoteConfiguration and to manage it as a component in the Spring application context.
|This application is hard coded to look up zip code 94304, Palo Alto, CA. Towards the end of this guide, you’ll see how to plug in a different zip code without editing the code.|
Logging output is displayed. The service should be up and running within a few seconds.
Requesting quote for MSFT <StockQuotes><Stock><Symbol>MSFT</Symbol><Last>62.70</Last>...</StockQuotes>
You can plug in a different ticker by typing
java -jar build/libs/gs-consuming-web-service-0.1.0.jar ORCL
Requesting quote for ORCL <StockQuotes><Stock><Symbol>ORCL</Symbol><Last>39.26</Last>...</StockQuotes>
Congratulations! You’ve just developed a client to consume a SOAP-based web service with Spring.