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Providers and XML Processing without JAXB in Java Access barcode code39 in Java Providers and XML Processing without JAXB

Providers and XML Processing without JAXB using barcode maker for java control to generate, create barcode 39 image in java applications. GS1 DataBar Overview Unlike in the @We 3 of 9 barcode for Java bService case, however, in the @WebServiceProvider case, it is your responsibility to do all the validation of the form of the incoming messages to ensure that they are compliant with the WSDL at least compliant enough for your business logic to successfully process them. This example uses javax.xml.

transform.Source as the type parameter for Provider<T>. So, as you can see, it implements a method of the form:.

public Source inv oke(Source payload). When the JAX-WS r j2ee Code 3/9 untime receives a request that is dispatched to this Web service, it calls this invoke method and provides the message payload as the input parameter. To implement the business logic, it is up to you to process the raw XML. Example 7 5 shows how the Document Object Model (DOM) APIs are used in this example to do that processing.

If you are not familiar with the DOM APIs, or you need a refresher, I suggest you take a second to look through one of the online tutorials, such as 6 of Sun s J2EE 1.4 tutorial found at http://java.sun.

com/j2ee/1.4/docs/tutorial/doc/. The DOM processing in Example 7 5 begins with the creation of a document to hold the payload request.

This is necessary because the Source form of the payload is not accessible using the DOM APIs. You must transform it into a DOM representation. In this example, it is transformed into payloadDoc an instance of org.

w3c.dom.Document.

The code creates another Document instance, referenced by respDoc, to hold the response message that is constructed. Next, an instance of javax.xml.

transform.Transformer xformer is used to load the payload Source into the payloadDoc Document. The WSDL for this service, shown toward the end of this chapter in Example 7 29, indicates that the response message should have the form:.

<xs:element na me="requestOrderResponse"> <xs:complexType> <xs:sequence> <xs:element ref="oms:Order"/> </xs:sequence> </xs:complexType> </xs:element>. As a result, usin ANSI/AIM Code 39 for Java g DOM to construct the response message in this example is done as follows:. Element responseE lt = respDoc.createElementNS(REQ_NS, "requestOrderResponse");. JAX-WS 2.0 Server-Side Development The Document.crea teElementNS method is used here to create an element with the local name requestOrderResponse in the namespace de ned by the String constant REQ_NS (the target namespace)..

Example 7 5 Using DOM to Implement Web Service Processing 115 116 117 118 1 19 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = dbfac.newDocumentBuilder(); Document respDoc = docBuilder.

newDocument(); Document payloadDoc = docBuilder.newDocument(); Transformer xformer = TransformerFactory.newInstance().

newTransformer(); xformer.transform(payload, new DOMResult(payloadDoc)); Element responseElt = respDoc.createElementNS(REQ_NS, "requestOrderResponse"); Element orderElt = respDoc.

createElementNS(OMS_NS, "Order"); responseElt.appendChild(orderElt); Element orderKeyElt = respDoc.createElementNS(OMS_NS, "OrderKey"); orderElt.

appendChild(orderKeyElt); // generate a pseudo-unique 10-digit order ID String orderId = Long.toString((new Date()).getTime()); orderId = orderId.

substring(orderId.length()-10); orderKeyElt.appendChild(respDoc.

createTextNode(orderId)); Element orderHeaderElt = respDoc.createElementNS(OMS_NS, "OrderHeader"); orderElt.appendChild(orderHeaderElt); // items wrapper comes after header Element orderItemsElt = respDoc.

createElementNS(OMS_NS, "OrderItems"); orderElt.appendChild(orderItemsElt); Element salesOrgElt = respDoc.createElementNS(OMS_NS, "SALES_ORG"); orderHeaderElt.

appendChild(salesOrgElt); salesOrgElt.appendChild(respDoc.createTextNode("WEB")); Element purchDateElt = respDoc.

createElementNS(OMS_NS, "PURCH_DATE"); orderHeaderElt.appendChild(purchDateElt); purchDateElt.appendChild( respDoc.

createTextNode(dateAsString(new GregorianCalendar()))); Element custNoElt = respDoc.createElementNS(OMS_NS, "CUST_NO"); orderHeaderElt.appendChild(custNoElt); // get CUST_NO from payload NodeList nl = payloadDoc.

getElementsByTagNameNS(REQ_NS, "CUST_NO"); custNoElt.appendChild(respDoc.createTextNode( ((Text)((Element) nl.

item(0)).getFirstChild()).getNodeValue()));.

book-code/chap07/endpoint-provider/modules/endpoint/src/java/samples/ RequestOrderEndpoint.java Deploying Web Services Using Custom Java/XML Mappings As you can see, t barcode code39 for Java he code continues like that, using DOM APIs to build the response message tree. The Document.createElementNS() method is used to create elements, and the method Node.

appendChild() is used to add them into the DOM tree. To run the sample code in this section, do the following: 1. Start GlassFish (if it is not already running).

2. Go to <book-code>/chap07/endpoint-provider. 3.

Enter mvn install. This example should give you the sense that programming with the DOM API is tedious and error prone (but sometimes necessary). I used about 80 lines of DOM API code in this example (not all shown here).

In contrast, the JAXB code from Example 7 3 to implement the same functionality requires about 20 lines. Of course, there are better ways to program with XML than working with the DOM APIs. I m just using this example to make a point: It is signi cantly easier and less error prone for most Java programmers to work with JAXB-generated classes than to implement business logic by directly manipulating XML.

On the other hand, there are often good reasons not to use either XML programming techniques (e.g., DOM) or JAXB particularly when doing SOA and you have existing Java classes that implement your business logic.

For example, what happens if you already have a PurchaseOrder class and it contains a method named processOrder that already implements your company s business process for receiving an order, processing it, and returning a PO Wouldn t you rather deploy that class The problem you run into here is that the Java/WSDL mapping provided by JAX-WS and JAXB can t easily be coerced into mapping your existing PurchaseOrder.processOrder() method to the desired wsdl:portType. In such a situation, you may want to consider writing a JAX-WS service implementation bean that uses a custom Java/XML mapping to bind the WSDL types to your existing Java classes.

The next section provides an example of how this can be done..
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