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WS-Metadata 2.0 in Java Draw Code 39 Full ASCII in Java WS-Metadata 2.0




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WS-Metadata 2.0 using barcode creator for jar control to generate, create code 3 of 9 image in jar applications. qr Again, for th Code 3/9 for Java e sake of argument, assume there is a mapping that can be expressed using annotations. How do you nd this mapping You have to make some annotations, run the WSDL/schema generator, and look at the resulting WSDL to see whether it matches the standard WSDL agreed on by your business partners. That process is kind of like trying to do assembly language programming by writing C code, compiling it, and looking at the bytes to see whether it produced what you want.

Not a very ef cient process! But, again, for the sake of argument, assume you have persevered and were able to come up with annotations that generate the necessary WSDL. Now, what happens if your business partners make a change to the WSDL In this case, you are back at square one, editing the annotations, running the WSDL/schema generator, and trying to get things lined up again. Once you have the correct annotations gured out (assuming it s even possible), again, you have to recompile and redeploy the code with the new annotations.

Hopefully, this example has convinced you that annotations may have some limitations with respect to the Start from WSDL and Java development mode. Faced with these issues, most programmers will choose to create a wrapper for the PurchaseOrder class. This can best be accomplished by running the WSDL/schema compiler on your business partners standard WSDL.

You can take the resulting Java classes and turn them into wrappers that invoke your real classes. Annotations let you delimit your modi cation to the generated classes, so you can refresh them if the WSDL changes and not lose the modi cations you put in to invoke your existing PurchaseOrder.createPurchaseOrder() method.

In this overview of WS-Metadata, I take the point of view of a programmer who is using this wrapper-based integration approach to Start from WSDL and Java development mode. That is not to say that I believe the wrapper-based integration approach is the best way to approach the Start from WSDL and Java development mode. It may be, but I think it is worth exploring some other possibilities.

For example, in 11, I use SOA-J to demonstrate a different approach to Start from WSDL and Java and SOA-style systems integration. But at this point, I am reviewing the JWS programming model, where wrapper-based integration is probably the best approach to Start from WSDL and Java development. As shown in Table 2 3, the WS-Metadata features discussed here are all related to Web Services deployment.

The remainder of this section provides an overview of these features. 8 examines WS-Metadata and WSEE (JSR-109) in detail and provides many deployment examples. Before looking at each of these features one by one, examine Figure 2 5, which shows how WS-Metadata can be used to shape the deployment of a Web.

An Overview of Java Web Services Table 2 3 WS- swing 39 barcode Metadata 2.0 Feature Map Invocation Serialization Deployment WSDL Mapping Annotations SOAP Binding Annotations Handler Annotations Service Implementation Bean Start from WSDL and Java Automatic Deployment. service. The code and WSDL in Figure 2 5 illustrate a variety of WSMetadata annotations working together. This example is taken from the WS-Metadata 2.

0 speci cation Section 4.7.3 (Example 3 the document/ literal wrapped example).

The WS-Metadata annotations are numbered 1 8 and the red lines show where, in the WSDL, the annotation has its effect. The following items give you a general idea of what these annotations are doing without a lot of the detail. I discuss these annotations in detail in 8.

The various styles of WSDL are described in 4. 1. @WebService marks this Java class as a Web service so that the JWS implementation will understand that it is to be deployed.

2. @SOAPBinding indicates that this Web service uses the SOAP protocol. 3.

The @SOAPBinding.style element indicates that this Web service should be deployed using the document style. This annotation sets the WSDL soap:binding element s style attribute as shown.

4. The @SOAPBinding.use element indicates that the messages for this Web service should be sent using the literal format (as opposed to encoded).

This annotation affects the soap:body element s use attribute as shown. 5. The @SOAPBinding.

parameterStyle element indicates that the messages for this Web service should use wrapped parameters. As a result, the element name of the parameter wrapper becomes SubmitPO the same as the operation name of the Web service..

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