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What is a web service
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messages over a network protocol, most commonly HTTP. SOAP is heavily dependent on XML, and every SOAP message is an XML document that contains several elements (such as Envelope, Header, and Body). The SOAP header contains application-specific infrastructure data, such as security information. The SOAP body contains the message being exchanged between applications. While the SOAP header is optional for a SOAP message, the SOAP envelope and body are mandatory. Here is an example of a SOAP message with an empty header. The body includes an XML representation of ActionBazaar s addBid method with its parameters:
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<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Header/> <SOAP-ENV:Body> <addBid xmlns="http://actionbazaar.com/Bidding"> <user-id>viper</user-id> <item-id>100</user-id> <bid-price>2000.24</bid-price> </addBid> </SOAP-ENV:Body> </SOAP-ENV:Envelope>
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This snippet shows the skeleton of each and every SOAP message. The message starts off with an Envelope, which typically declares a namespace and may include encoding. Immediately inside the Envelope is the Header, which is optional. This contains meta-information about the message, such as security, network routing, and other data required to get the message to its destination. The last piece of the SOAP message is the Body, which in the case of our example, defines the addBid method and its associated parameters. Describing a web service: WSDL The Web Services Description Language (WSDL) is central to a web service because it describes the service to possible consumers. It specifies the message type, port, supported operations, data types, and all other details about how the web service works, where it can be found, and what the client should expect in return. Listing 15.1 shows a sample WSDL for ActionBazaar s PlaceBidService.
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Listing 15.1 WSDL for the PlaceBid service
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< xml version = '1.0' encoding = 'UTF-8' > <definitions xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:soap ="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd
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Exposing EJBs as web services
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="http://www.w3.org/2001/XMLSchema" xmlns:mime ="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns ="http://ejb3inaction.example.buslogic/" name="PlaceBidBeanService" targetNamespace="http://ejb3inaction.example.buslogic/"> <types> Data types <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns:soap11-enc= "http://schemas.xmlsoap.org/soap/encoding/" targetNamespace= "http://ejb3inaction.example.buslogic/" elementFormDefault="qualified"> <element name="addBid" type="tns:addBid"/> <complexType name="addBid"> <sequence> <element name="userId" type="string" nillable="true"/> <element name="itemId" type="long" nillable="true"/> <element name="bidPrice" type="double" nillable ="true"/> </sequence> </complexType> <element name="addBidResponse" type="tns:addBidResponse"/> <complexType name="addBidResponse"> <sequence> <element name="return" type="long" nillable="true"/> </sequence> </complexType> </schema> </types> <message name="PlaceBidBeanPortType_addBid"> Messages <part name="parameters" element="tns:addBid"/> </message> <message name="PlaceBidBeanPortType_addBidResponse"> <part name="parameters" element="tns:addBidResponse"/> </message> <portType name="PlaceBidBean"> Port types <operation name="addBid"> <input message="tns:PlaceBidBeanPortType_addBid"/> <output message="tns:PlaceBidBeanPortType_ addBidResponse"/> </operation> </portType> <binding name="PlaceBidBeanSoapHttp" type="tns:PlaceBidBean"> SOAP binding <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="addBid"> Operations <soap:operation soapAction=""/> <input> <soap:body use="literal"/> </input> <output> <soap:body use="literal"/>
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What is a web service
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</output> </operation> </binding> <service name="PlaceBidBeanService"> Service <port name="PlaceBid" Port binding="tns:PlaceBidBeanSoapHttp"> <soap:address location="${oracle.scheme.host.port. and.context}/PlaceBid"/> </port> </service> </definitions>
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Let s briefly look at some important parts of a WSDL. In listing 15.1, the types element b defines the data types exchanged when the web service is invoked. The parameters passed to and returned from a method are considered data types. The code c defines the messages the service supports. A message may contain more than a message part. Each message part is actually part of the SOAP message being sent, and is either a parameter or result being passed. The code d then defines the portType. A portType is the most important part of a WSDL; it defines operations that can be performed and the messages involved. The message, operations f, and protocol details of a service are defined using a binding e. This example defines the service to be a document style service. Finally, the code g defines a top-level service that uses the binding we defined, using the port definition h. Java to WSDL mapping There is no one-to-one mapping between XML data types and Java; there never has been. This presents a problem because the data types expected by a service are defined in the WSDL. If a service is implemented in a non-Java language, that language must provide support for binding XML to it. But when a service is implemented in Java, the binding is accomplished through the Java Architecture for XML Binding (JAXB) 2.0 specification. JAXB allows web services to use the complete XML schema, which results in improved interoperability and ease of use. While the details of binding Java to WSDL are beyond the scope of this book, you can find out more from the Java API for XML -Based Web Services (JAX-WS) specification at http://jcp.org/en/jsr/detail id=224, and check out the JAXB specification at http://www.jcp.org/en/jsr/detail id=222. You ll find an easy-to-use reference for mapping Java data types to XML and WSDL types at http://download-west.oracle. com/docs/cd/B25221_04/web.1013/b25603/apptypemapping.htm#BABCCAHA.
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