JAVA WEB SERVICES UP AND RUNNING EBOOK
resourceone.info . Preface. Welcome to the second edition of Java Web Services: Up and Running. This edition, like the first, is for programmers interested in. Media, Inc. Java Web Services: Up and Running, the image of a great cormorant, and related .. Safari offers a solution that's better than e-books. It's a virtual. Java Web Services: Up and Running takes a clear, pragmatic approach to these technologies by providing a mix of architectural overview, complete working.
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With Java Web Services: Up and Running, you will:Understand the distinction between SOAP-based and REST-style servicesWrite, deploy. Learn how to develop REST-style and SOAP-based web services and clients with this quick and thorough introduction. This hands-on book. Editorial Reviews. resourceone.info Review. Q&A with Martin Kalin, author of "Java Web Services: eBook features: Highlight, take notes, and search in the book; In this edition, page numbers are just like the physical edition; Length: pages; Enhanced.
Provide some values for input in the request and submit it to the web service end point URL. You should get output from the service similar to the below image. It confirms that our web service is up and running.
Now we will proceed with the last task of invoking the web service using Axis2 stub classes. Create lib folder and copy all the Axis2 jars from downloaded binary distribution lib folder. Add these jars to the build path of the project. Copy earlier generated MyServiceStub.
In my case I copied them in com. If you have to provide these classes to somebody else, I would strongly suggest creating a jar from them and then distributing it with others to avoid any modifications.
The project structure will look similar like below image. RemoteException; import com. MyServiceStub; import com. GetData; import com.
GetDataResponse; import com. GetObjectData; import com. GetObjectDataResponse; import com. You can also make use of methods annotated with PostConstruct and PreDestroy for lifecycle event callbacks.
You can add the annotations directly to the class, and JAX-WS will implicitly define a service endpoint interface. One way to do this is by creating a Java project and importing the web service definitions from the web service WSDL document.
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After creating the project, open a command line and move to the source folder of the new project; then execute the command: wsimport -s. In a few short years, REST has overtaken SOAP in popularity due to its ease of use, speed, flexibility, and similarity to core architecture choices that power the web itself.
Since this is only a specification — meaning a set of interfaces and annotations — you also need to choose an implementation of the spec.
To start working with the Jersey JAX-RS implementation, you need to add the jersey-server dependency to your project classpath. Then, we do a GET, retrieve all users and verify the response to check if it contains the new user we just created. The loan broker contacts each bank directly using predictive routing i. In this stage the loan broker application sends the request to the selected banks using the Recipient List pattern.
Because each bank can use a different format for the request, the loan broker needs to use an array of Message Translator s to convert the request into the format required by each bank. Likewise, each reply message has to be converted to a common format using a Normalizer , so that all replies can be aggregated into the single best quote. The request and response messages are passed synchronously, i.
The loan broker aggregates all responses into the single best quote and sends the best quote reply back to the client. Synchronous messaging is useful in some problem domains where a simple solution is necessitated. By using synchronous messaging we do not have to worry about handling asynchronous events, thread safety or the infrastructure needed to support them.
The client invokes the loan broker web service and then waits for the response from the server. Based on the general description of the overall example the first component of the server application is the loan broker whose endpoint is exposed as the web service. There are several components in this solution and each component makes a synchronous call to the next component and waits for the response.
Seriously, designing a robust Web services interface requires us to dive into a a number of terminologies and associated design trade-offs.
While this book is not an introduction into Web Services, we feel it is important to briefly discuss the following design considerations: Transport protocol Asynchronous messaging versus Synchronous messaging Encoding style SOAP Encoding vs. HTTP is a natural choice because it is the most commonly used protocol on the Web and can sneak through firewalls.
However, the HTTP protocol is the "Hyper Text Transfer Protocol" -- it was designed to allow users with Web browsers to retrieve documents over the Internet, not for applications to communicate with each other. The HTTP protocol is inherently unreliable and designed for synchronous document retrieval -- the client application uses the same connection for sending the request to the server and receiving the response.
Asynchronous vs. Synchronous In a synchronous implementation of a Web Service, the client connection remains open from the time the request is submitted to the server.
The client will wait until the server sends back the response message. The advantage of using the synchronous RPC communication is that the client application knows the status of the Web Service operation in a very short time either it receives a response or it times out.
A serious limitation of using synchronous messaging is that the server may have to deal with a large number of concurrent connections because each concurrent client maintains an open to connection while waiting for the results. This causes the server application to become increasingly complex. If one of the invocations to a synchronous service provider fails, the server application has to provide the mechanism to trap the failure and recover and re-route the processing or flag an error before continuing with the other synchronous invocations.
At the present time, most Web Services toolkits only support synchronous messaging by default. However, using existing standards and tools such as asynchronous message queuing frameworks, some vendors have emulated asynchronous messaging for Web Services. Several organizations, companies and the Web Services working groups have recognized the need to have asynchronous messaging support and have been moving towards defining standards e.
This mode determines how application objects and parameters are represented in the XML "on the wire".
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Thus, the original SOAP specification had to provide a way of encoding type information along with the parameters being sent for method calls because there was no accepted way of specifying it. Where this really comes into play is with complex data types such as Arrays.
Section 5. This obviates the need for extra encoding information in the XML. The values of the binding style attribute are "RPC" and "Document". This means, for instance, that the XML element inside the SOAP body called a "wrapper element" must have a name identical to the name of the corresponding programming-language operation that is to be invoked, that each message part within that element must correspond exactly in name and order to a parameter of that programming-language operation, and that there must be only a single element returned which must be named XXXResponse, where XXX is the name of the corresponding operation in the language that contains inside it exactly one element, that is the return value of the operation.
The "Document" binding style is much looser. A message in the document binding style must simply be made up of well-formed XML. It is up to the SOAP engine that receives it how it will be interpreted. Now, having said that, it is fairly common for instance among Microsoft tools to use "Document" binding style and "Literal" encoding to represent RPC semantics. Even though a "Document" style is used, the message being sent represents a Command Message , with the operation to be invoked and the parameters to be passed encoded in the "Document".
Reliability and Security In the chapter Emerging Standards and Futures in Enterprise Integration , Sean Neville describes evolving standards that aim to address the issues of reliability and security for Web Services.
Our solution uses the most basic and probably still most prevalent combination of these design choices. This makes the Web service behave very much like a Remote Procedure Invocation.
We went this route so that we do not get stuck debating Web services internals well, not any more than we already did but can focus on contrasting the synchronous Web services implementation with the other implementations. Apache Axis This section provides a brief description of the Axis architecture to help elucidate the significant points in our design.
For additional details on Axis please refer to the Apache Axis web site at xml. The chapter Root Patterns defines a Message Endpoint as the mechanism an application uses to connect to a messaging channel in order to send and receive messages.
In our loan broker application, the Axis framework itself represents the message channel and its main function is to handle the processing of messages on behalf of the user application.
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The Axis server implements the Service Activator pattern. In the chapter on Messaging Endpoints, we described how a Service Activator connects a Message Channel to a synchronous service in an application so that when a message is received, the service is invoked.
The Message Adapter is implemented within the Axis server so that the developer does not need to implement this functionality. Therefore the application code contains only business logic for the application and the Axis server takes care of all message-handling services.
The client-programming model of Axis provides the components for the client application to invoke an endpoint URL and then receive the response message from the server. The loan broker client in this application is a synchronous client that uses this client-programming model of Axis. Within the server there is a listener for each transport protocol supported by the server. When the client sends a message to the endpoint, a transport listener within the Axis framework creates a message context object and passes it through a request chain in a framework.
The Message Context contains the actual Message received from the client along with associated properties added by the transport client. The Axis framework is made up of a series of Handlers, which are invoked in a particular order depending on the deployment configuration and whether the client or server is invoking the framework. Handlers are part of the Message Flow subsystem and are grouped together and called Chains.
Request messages are processed by a sequence of request Handlers in a Chain. Any response messages are sent back on the corresponding response Chain through a sequence of response Handlers. The figure above shows a high level representation of the internals of the Axis framework.
Axis consists of several subsystems that work together to provide the functionality of a Message Channel. This framework is available for use by both the client and server application. There are three techniques for deploying a java class as a Web service and being made available as an endpoint service and we have named them as follows. The methods of this class contain the business logic.
The JWS file does not need to be compiled and can be instantly deployed by copying the source file into the webapps directory on the server. Each public method is now accessible as a Web service.
The automatic generation of WSDL allows other applications to inspect the remote interface provided by the Web service class. It can also be used to automatically generate client stub classes that encapsulate the Web services call inside a regular Java class.
The disadvantage of this method is the developer cannot control the deployment parameters. The second technique deploys a compiled class using a WSDD Web Services Deployment Descriptor , which allows the developer to control the deployment parameters, e.
By default, a class gets deployed in the request scope i. Once the processing is finished the instance is destroyed. If the class has to persist for the entire session to service multiple requests from the same client over a period of time, we need to define the class in the session scope.
For some applications, we need all clients to access a singleton class, i. The last technique is more complicated than the previous two techniques but allows the generation of proxies and skeletons from an existing WSDL document using the wsdl2java tool. The proxies and skeletons encapsulate all SOAP-related code so that the developer does not have to write any SOAP or Axis -related code, but can instead insert the business logic right into in the method bodies of the generated skeleton.
We choose to implement all our Web services using the Automatic Deployment technique using JWS files, in order to keep the design and deployment requirements as simple as possible.
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On the client side it is a lot easier to hand code the call to the Web Service. We could have used wsdl2java to generate the stubs, which would then be called by the client code, however we tried to minimize the amount of code generation because it can make it difficult to walk through an example solution.Running the Solution Please refer to the sections on installation of Axis and the loan broker application which appears towards the end of the chapter.
These interfaces are used to obtain the rate quote for a loan from that particular bank. Gregory Brill. The New Community Rules. George Schlossnagle. In reality the user interface could be implemented as a windows based fat client or a browser based thin client.
You should get output from the service similar to the below image.