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The manufacturer generates a SOAP message whenever a product image has been updated. When the message arrives at the distributor, a JAXMServlet s onMessage method is called with a JAXM Message parameter. Our example servlet inspects the Message to obtain a reference to a JDOM Element that contains the method call parameters.
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Element productIdElem = message.getSOAPPart() .getSOAPEnvelope() .getSOAPBody() .getChild("productImage", Namespace .getNamespace("myco", "http://schemas.mycompany.com/Product-Images"));
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The JDOM Element is then inspected to determine the product identifier, type of image, and the identifier for the MIME block that contains the image data.
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String productId = productIdElem.getAttributeValue("id"); String imageType = productIdElem.getAttributeValue("type"); String mimeContentId = productIdElem.getChild("imageData") .getAttributeValue("href");
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The attachments are then inspected to locate the image data and save it to a file. The JAXM API assumes that more than one attachment is present in any message, so we must iterate over a collection of one in this case.
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Iterator attachmentIterator = message.getAttachments(); while (attachmentIterator.hasNext()) { AttachmentPart ap = (AttachmentPart) attachmentIterator.next(); // match attachment's content id to the // id specified above if (mimeContentId.equals(ap.getContentId())) { . . . } }
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Listing 4.5 contains the full source code for the JAXM servlet that accepts inbound SOAP messages.
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J2EE and SOAP
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Listing 4.5
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import import import import
A JAXM servlet for inbound SOAP messaging
javax.xml.messaging.*; javax.xml.soap.*; javax.activation.DataHandler; org.jdom.*;
import java.io.*; import java.util.*;
JAXM is built on top of JDOM
/** * A JAXM servlet that receives asynchronous * image updates for products from a supplier. */ public class ImageUpdateServlet extends JAXMServlet { public SOAPMessage onMessage(SOAPMessage message) { try {
Handles image update
Gets the SOAP block Element productIdElem = containing the message.getSOAPPart() product ID .getSOAPEnvelope() .getSOAPBody() .getChild("productImage", Namespace .getNamespace("myco", "http://schemas.mycompany.com/Product-Images"));
// get the product ID corresponding to // the image file String productId = productIdElem.getAttributeValue("id"); // get the image type String imageType = productIdElem.getAttributeValue("type"); // get the attachment's MIME id String mimeContentId = productIdElem.getChild("imageData") .getAttributeValue("href"); // go get the attached image data Iterator attachmentIterator = message.getAttachments(); // iterate the attachments - should only be one while (attachmentIterator.hasNext()) { AttachmentPart ap = (AttachmentPart) attachmentIterator.next(); // match attachment's content id to the // id specified above if (mimeContentId.equals(ap.getContentId())) {
Application integration
// obtain a data handler for the type of content // see javax.activation.DataHandler for details DataHandler dh = ap.getDataHandler(); // store the binary image data someplace } } } catch(Exception e) { // log the error, panic, etc. } // asynchronous SOAP - no message to send back return null; } }
Handles the image update asynchronous message. This method returns null because no response is sent back to the message creator.
SOAP is an important development in the application integration space. Our discussion has been so detailed because we believe that it will play a significant role in your J2EE application in the future.
Building web services in J2EE
The idea of web services is taking the technology industry by storm, due in large part to vigorous support from software giants such as IBM, Sun Microsystems, and Microsoft. It is central to Microsoft s .NET strategy, as well as those of IBM, Sun, and numerous other companies. Since web services appear destined to succeed, we discuss building and using web services in the J2EE environment in this section. As XML messaging technologies such as SOAP have gained momentum, moving distributed application architectures away from tightly coupled technologies such as CORBA and RMI has become possible. The web services architecture is a loosely coupled, service-oriented environment in which applications expose functionality to one another over the Web. This type of architecture maximizes the flexibility and interoperability of distributed applications. Because it is based on open standards such as XML and HTTP, it is completely vendor- and implementation-independent. A web service created using C++ and Microsoft s .NET development tools can be consumed by a Java component running in a J2EE container. And once these services become pervasive, new types of applications that aggregate a set of services into completely integrated, inter-enterprise distributed systems will be possible.
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