Returning multiple values from a web service
By: Emiley J Printer Friendly Format
Although this is quite a common requirement, it could be quite a daunting task for a beginner learning web service. I have seen so many questions in various forums regarding this. For example, one popular question is how to return a HashMap from a web service. In this tutorial, I will keep it very simple. I will just return two values from the webservice instead of one.
The trick is to use javax.xml.ws.Holder and define @WebParam as an output parameter in your definition. An example is below.
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.xml.ws.Holder;
/**
*
* @author Emiley
*/
@WebService(serviceName = "TestMultiple")
public class TestMultiple {
@WebMethod(operationName = "Calculate")
public void Calculate(@WebParam(name = "sum", mode = WebParam.Mode.OUT) Holder sum,
@WebParam(name = "multiply", mode = WebParam.Mode.OUT) Holder multiply) {
sum.value = 4+5;
multiply.value = 4*5;
}
}
When you call this web service, you will get the following output.
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Body>
<ns2:operationResponse xmlns:ns2="http://java-samples.com/">
<sum>9</sum>
<multiply>20</multiply>
</ns2:operationResponse>
</S:Body>
</S:Envelope>
Of course, you can make your web service more useful by adding two parameters to get the values and add them as below
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.xml.ws.Holder;
/**
*
* @author Emiley
*/
@WebService(serviceName = "TestMultiple")
public class TestMultiple {
@WebMethod(operationName = "Calculate")
public void Calculate(int x, int y, @WebParam(name = "sum", mode = WebParam.Mode.OUT) Holder sum,
@WebParam(name = "multiply", mode = WebParam.Mode.OUT) Holder multiply) {
sum.value = x+y;
multiply.value = x*y;
}
}
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