soap知识

OrderProcessor.javaview sourceprint001    package javaxml2;002     003    import java.io.IOException;004    import java.io.StringWriter;005    import java.net.MalformedURLException;006    import java.net.URL;007    import java.util.Enumeration;008    import java.util.Hashtable;009    import java.util.Iterator;010    import java.util.LinkedList;011    import java.util.List;012    import java.util.Vector;013    import javax.mail.MessagingException;014     015    // DOM016    import org.w3c.dom.Do*****ent;017    import org.w3c.dom.Element;018    import org.w3c.dom.NodeList;019    import org.w3c.dom.Text;020     021    // SOAP imports022    import org.apache.soap.Constants;023    import org.apache.soap.Envelope;024    import org.apache.soap.Fault;025    import org.apache.soap.SOAPException;026    import org.apache.soap.encoding.SOAPMappingRegistry;027    import org.apache.soap.encoding.soapenc.BeanSerializer;028    import org.apache.soap.rpc.Call;029    import org.apache.soap.rpc.Parameter;030    import org.apache.soap.rpc.Response;031    import org.apache.soap.rpc.SOAPContext;032    import org.apache.soap.util.xml.QName;033     034    /**035     * <p>036     *  <code>OrderProcessor</code> is a web services client, and uses037     *    SOAP-RPC to interact with web services. However, it is also a038     *    web service, and receives SOAP messages and uses them to then039     *    construct SOAP-RPC calls, as well as sending return messages to040     *    its own web service clients.041     * </p>042     */043    public class OrderProcessor {044     045        /** Mapping for CD class */046        private SOAPMappingRegistry registry;047     048        /** The serializer for the CD class */049        private BeanSerializer serializer;050     051        /** The RPC Call object */052        private Call call;053     054        /** Parameters for call */055        private Vector params;056     057        /** Response from RPC call */058        private Response rpcResponse;059     060        /** The URL to connect to */061        private URL rpcServerURL;062     063        /**064         * <p>065         *  This will set up initial default values.066         * </p>067         */068        public void initialize() {069            // Set up internal URL for SOAP-RPC070            try {071                rpcServerURL =072                    new URL("http://localhost:8080/soap/servlet/rpcrouter");073            } catch (MalformedURLException neverHappens) {074                // ignored075            }076     077            // Set up a SOAP mapping to translate CD objects078            registry = new SOAPMappingRegistry();079            serializer = new BeanSerializer();080            registry.mapTypes(Constants.NS_URI_SOAP_ENC,081                new QName("urn:cd-catalog-demo", "cd"),082                CD.class, serializer, serializer);083     084            // Build a Call to the internal SOAP service085            call = new Call();086            call.setSOAPMappingRegistry(registry);087            call.setTargetObjectURI("urn:cd-catalog");088            call.setMethodName("getCD");089            call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);090     091            // Set up input092            params = new Vector();093        }094     095        /**096         * <p>097         *  This method receives SOAP messages addressed to this web service,098         *    decodes those messages, and sends them to another web service099         *    via SOAP-RPC.100         * </p>101         *102         * @param env the SOAP envelope carrying the SOAP message.103         * @param req the SOAP request variable.104         * @param res the SOAP response variable.105         * @throws <code>IOException</code> - when errors result in connecting106         *         to the SOAP-RPC service.107         * @throws <code>MessagingException</code> - when errors occur108         *         in sending and receiving SOAP messages.109         */110        public void purchaseOrder(Envelope env, SOAPContext req, SOAPContext res)111            throws IOException, MessagingException {112     113            // Set up SOAP environment114            initialize();115     116            // Set up list of CDs successfully ordered117            List orderedCDs = new LinkedList();118     119            // Set up hashtable of failed orders120            Hashtable failedCDs = new Hashtable();121     122            // Get the purchaseOrder element - always the first body entry123            Vector bodyEntries = env.getBody().getBodyEntries();124            Element purchaseOrder = (Element)bodyEntries.iterator().next();125     126            // In a real application, do something with the buyer information127     128            // Get the CDs ordered129            Element order =130                (Element)purchaseOrder.getElementsByTagName("order").item(0);131            NodeList cds = order.getElementsByTagName("cd");132     133            // Loop through each ordered CD from the PO request134            for (int i=0, len=cds.getLength(); i<len; i++) {135                Element cdElement = (Element)cds.item(i);136                String artist = cdElement.getAttribute("artist");137                String title = cdElement.getAttribute("title");138     139                // Set up input140                params.clear();141                params.addElement(new Parameter("title", String.class, title, null));142                call.setParams(params);143     144                try {145                    // Invoke the call146                    rpcResponse = call.invoke(rpcServerURL, "");147     148                    if (!rpcResponse.generatedFault()) {149                        Parameter returnValue = rpcResponse.getReturnValue();150                        CD cd = (CD)returnValue.getValue();151     152                        // See if the CD is available153                        if (cd == null) {154                            failedCDs.put(title, "Requested CD is not available.");155                            continue;156                        }157     158                        // Verify it's by the right artist159                        if (cd.getArtist().equalsIgnoreCase(artist)) {160                            // Add this CD to the successful orders161                            orderedCDs.add(cd);162                        } else {163                            // Add this to the failed orders164                            failedCDs.put(title, "Incorrect artist for specified CD.");165                        }166                    } else {167                        Fault fault = rpcResponse.getFault();168                        failedCDs.put(title, fault.getFaultString());169                    }170                } catch (SOAPException e) {171                    failedCDs.put(title, "SOAP Exception: " + e.getMessage());172                }173            }174     175            // At the end of the loop, return something useful to the client176            Do*****ent doc = new org.apache.xerces.dom.Do*****entImpl();177            Element response = doc.createElement("response");178            Element orderedCDsElement = doc.createElement("orderedCDs");179            Element failedCDsElement = doc.createElement("failedCDs");180            response.appendChild(orderedCDsElement);181            response.appendChild(failedCDsElement);182     183            // Add the ordered CDs184            for (Iterator i = orderedCDs.iterator(); i.hasNext(); ) {185                CD orderedCD = (CD)i.next();186                Element cdElement = doc.createElement("orderedCD");187                cdElement.setAttribute("title", orderedCD.getTitle());188                cdElement.setAttribute("artist", orderedCD.getArtist());189                cdElement.setAttribute("label", orderedCD.getLabel());190                orderedCDsElement.appendChild(cdElement);191            }192     193            // Add the failed CDs194            Enumeration keys = failedCDs.keys();195            while (keys.hasMoreElements()) {196                String title = (String)keys.nextElement();197                String error = (String)failedCDs.get(title);198                Element failedElement = doc.createElement("failedCD");199                failedElement.setAttribute("title", title);200                failedElement.appendChild(doc.createTextNode(error));201                failedCDsElement.appendChild(failedElement);202            }203     204            // Set this as the content of the envelope205            bodyEntries.clear();206            bodyEntries.add(response);207            StringWriter writer = new StringWriter();208            env.marshall(writer, null);209     210            // Send the envelope back to the client211            res.setRootPart(writer.toString(), "text/xml");212        }213    }