Web Services Essentials

Service Code

The full service code is shown in Example 5-6. Note that the ProductXMLService class extends ProductService from the previous example and therefore utilizes the same product hashtable. Note also that the new getProduct( ) method accepts a DOM Element and returns a DOM Element. Within the method, we’ll first extract the SKU attribute code:

String sku = request.getAttribute("sku");

We will then search the product hashtable. If a match is found, we can build an entire XML document via the DOM API. As a shortcut, we can use the Apache utility method to retrieve a DocumentBuilder object:

DocumentBuilder docBuilder = XMLParserUtils.getXMLDocBuilder(  );
Document doc = docBuilder.newDocument(  );

With the document in hand, we can then proceed to add the proper hierarchy of XML elements. For example, the following code creates a product name element with the corresponding text subelement:

Text productNameText = doc.createTextNode(product.getName(  ));
Element nameNode = doc.createElement("name");
nameNode.appendChild(productNameText);

Example 5-6. ProductXMLService.java

package com.ecerami.soap;

import java.util.Hashtable;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
                     import org.apache.soap.util.xml.XMLParserUtils; /** * A Sample SOAP Service * Provides Product Name for requested Stockkeeping Unit (SKU) * Information is passed as Literal XML Documents. */ public class ProductXMLService extends ProductService{ /** * Provides Product Info for requested XML document. ...