read/write file with web service

after a totally sleepless night, this morning i was googling to find a binding for java.io.File in web services with an unclear mind and very upset since i was not even close to my intention :((

you know, type of the file parameter in the following service becomes string in the client side..

@WebMethod(operationName = "retrieveFile")
@Oneway
public void retrieveFile(@WebParam(name = "file")
File file) {
}

the wsdl

<xs:complexType name="retrieveFile">
<xs:sequence>
<xs:element name="file" type="xs:string" minOccurs="0"/>
</xs:sequence>
</xs:complexType>

so, what to do ?
lucily, a friend in the team has searched for it before and came back with a solution:

http://m-button.blogspot.com/2008/07/building-jax-rpc-or-jax-ws-webservices.html

it is checked, guaranteed to work..