CXF Provider and Dispatch Services

Provider and Dispatch services用用开发WebService进行处理Raw XML Message, 并且不通过方法调用。而

基于SEI的实现，消息是被使用JAXB进行转换成的XML。当Web Service Client与 Web Service Provider之间

需要传输大量的XML Message时比较适合。

JAX-WS提供了javax.xml.ws.Provider接口，该接口提供了功能用于创建处理XML Message的Service Provider;

他从Dispatcher Client中获取XML格式的消息请求，处理，生成响应。Provider实现将在Server上Publish一个

ServiceEndpoint.

JAX-WS提供了javax.xml.ws.Dispatch接口用于处理XML消息并且发送XML格式的响应给Service Provider.

完整代码参考http://springsfeng.iteye.com/blog/1634753附件。

1. Privider Service实现

import javax.xml.namespace.QName;
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPMessage;
import javax.xml.transform.dom.DOMSource;
import javax.xml.ws.Provider;
import javax.xml.ws.Service;
import javax.xml.ws.ServiceMode;
import javax.xml.ws.WebServiceProvider;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

@WebServiceProvider()
@ServiceMode(value = Service.Mode.MESSAGE)
public class OrderProcessDOMProvider implements Provider<DOMSource> {

	public OrderProcessDOMProvider() {
	}

	public DOMSource invoke(DOMSource request) {
		DOMSource response = new DOMSource();
		try {
			MessageFactory factory = MessageFactory.newInstance();
			SOAPMessage soapReq = factory.createMessage();
			soapReq.getSOAPPart().setContent(request);

			System.out.println("Incoming Client Request as a DOMSource data in MESSAGE Mode");
			soapReq.writeTo(System.out);
			System.out.println("\n");

			Node processOrderNode = soapReq.getSOAPBody().getFirstChild();
			// Get arg0 - order element
			Node order = processOrderNode.getChildNodes().item(0);
			// Get list of child nodes associated with order and print it
			NodeList list = order.getChildNodes();
			for (int i = 0; i < list.getLength(); i++) {
				// Get the child nodes and value as per the order xml request.
				System.out.println(list.item(i).getNodeName() + "="	+ list.item(i).getFirstChild().getNodeValue());
			}

			SOAPMessage orderResponse = factory.createMessage();
			QName processOrderQName = new QName("http://server.webservice.sample.pcdp.org/","processOrder");
			QName responseQName = new QName("http://server.webservice.sample.pcdp.org/", "return");
			// create the element -
			// <http://order.demo/:processOrder></http://order.demo/:processOrder>
			SOAPElement processOrderResponse = orderResponse.getSOAPBody().addChildElement(processOrderQName);
			// create the element inside processOrder -
			// <http://order.demo/:return>ORD1234</http://order.demo/:return>
			processOrderResponse.addChildElement(responseQName).addTextNode("ORD1234");

			response.setNode(orderResponse.getSOAPPart());

		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return response;
	}
}

发布服务：

import javax.xml.ws.Endpoint;

public class Server {

	protected Server() throws Exception {
		System.out.println("Starting Server");

		Object implementor = new OrderProcessDOMProvider();
		String address = "http://localhost:8080/OrderProcessDOMProvider";
		Endpoint.publish(address, implementor);

	}

	public static void main(String args[]) throws Exception {
		new Server();
		System.out.println("Server ready...");

		Thread.sleep(50 * 60 * 1000);
		System.out.println("Server exiting");
		System.exit(0);
	}

}

2. Dispatcher Service实现

import java.net.URL;

import javax.xml.namespace.QName;
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPMessage;
import javax.xml.transform.dom.DOMSource;
import javax.xml.ws.Dispatch;
import javax.xml.ws.Service;
import javax.xml.ws.Service.Mode;

public final class DispatcherClient {

	public static final String WSDLFile = "http://localhost:8080/OrderProcessDOMProvider?wsdl";

	public DispatcherClient() {
	}

	public static void main(String args[]) throws Exception {

		URL wsdlURL = new URL(WSDLFile);

		MessageFactory factory = MessageFactory.newInstance();

		QName domProvider = new QName("http://provider.sample.pcdp.org/","OrderProcessDOMProviderService");
		QName portName = new QName("http://provider.sample.pcdp.org/","OrderProcessDOMProviderPort");

		Service service = Service.create(wsdlURL, domProvider);

		SOAPMessage soapRequest = factory.createMessage();

		QName processOrderQName = new QName("http://provider.sample.pcdp.org/","processOrder");
		// create the element - <http://order.demo/:processOrder></http://order.demo/:processOrder>
		SOAPElement processOrderResponse = soapRequest.getSOAPBody().addChildElement(processOrderQName);
		SOAPElement order = processOrderResponse.addChildElement("arg0");
		order.addChildElement("customerID").addTextNode("Naveen");
		order.addChildElement("itemID").addTextNode("I001");
		order.addChildElement("price").addTextNode("200.00");
		order.addChildElement("qty").addTextNode("200");

		DOMSource domRequestMsg = new DOMSource(soapRequest.getSOAPPart());
		Dispatch<DOMSource> domMsg = service.createDispatch(portName,DOMSource.class, Mode.MESSAGE);

		DOMSource domResponseMsg = domMsg.invoke(domRequestMsg);

		SOAPMessage soapReq = factory.createMessage();
		soapReq.getSOAPPart().setContent(domRequestMsg);

		System.out.println("Client Request as a DOMSource data in MESSAGE Mode");
		soapReq.writeTo(System.out);
		System.out.println("\n");

		System.out.println("Response from server: "	+ domResponseMsg.getNode().getLastChild().getTextContent());
	}
}

Client端输出：

Client Request as a DOMSource data in MESSAGE Mode
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Header/><SOAP-ENV:Body><processOrder xmlns="http://provider.sample.pcdp.org/"><arg0><customerID>Naveen</customerID><itemID>I001</itemID><price>200.00</price><qty>200</qty></arg0></processOrder></SOAP-ENV:Body></SOAP-ENV:Envelope>

Response from server: ORD1234

Server端输出：

Incoming Client Request as a DOMSource data in MESSAGE Mode
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Header/><SOAP-ENV:Body><processOrder xmlns="http://provider.sample.pcdp.org/"><arg0><customerID>Naveen</customerID><itemID>I001</itemID><price>200.00</price><qty>200</qty></arg0></processOrder></SOAP-ENV:Body></SOAP-ENV:Envelope>

customerID=Naveen
itemID=I001
price=200.00
qty=200

3. Provider and Dispatch概念理解

(1) Message Mode

Provider and Dispatche有两种消息类型：Provider and Dispatche,Payload. 区别在于两者之间的内容上。

Message mode由真实的数据和控制信息(Header)组成,而Payload Mode只仅仅有真实的数据组成。

例如：

@WebServiceProvider()
@ServiceMode(value = Service.Mode.MESSAGE)
public class OrderProcessDOMProvider implements Provider<DOMSource> {
     . . .

@WebServiceProvider()
@ServiceMode(value = Service.Mode.PAYLOAD)
public class OrderProcessDOMProvider implements Provider<DOMSource> {
     . . .

(2) The type of Mesage Object

Provider and Dispatch实现操作时的输入输出有以下几种类型：

javax.xml.transform.Source, javax.xml.soap.SOAPMessage, javax.activation.DataSource.

其中javax.activation.DataSource分为：

DOMSource, SAXSource, StreamSource.

CXF Provider and Dispatch Services

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