Java™ and SOAP provides Java developers with an in-depth look at SOAP (the Simple like to start working with SOAP, this is the book you need to get going. Java and SOAP Robert Englander Publisher: O'Reilly Edition May ISBN: 0- , pages Java™ and SOAP provides Java developers with an. Feb 17, For Java Web Services Developer's Pack, v . Chapter 5: SOAP with Attachments API for Java. . Open the PDF version of this book. 3.
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introduction to JAX-WS (Java API for XML-Web Services), the framework of choice for Java web services, whether SOAP- based or REST-style. My approach is. PDF | The paper presents the Java and SOAP (Simple Object Access Protocol) – working with WSDL (Web Services Description Language) and it looks at. applications using the SOAP, WSDL, and UDI protocols. You'll learn the XML underlying these standards, as well as how to use the popular toolkits for Java and.
Well help position Web services from a business and technical perspective, explaining and demonstrating how Web services can be used to address various business problems.
Another goal of this book is to help developers understand the issues and details relat- ed to building Web services using the techniques covered by this book. What pieces are required when youre planning a Web services strategy? What things do you need to take care of when youre developing Web services? We provide lots of examples to demon- strate these approaches. We also review in detail the Apache Axis Web services infrastruc- ture with our examples.
This book is meant for computing technical professionals with some experience building Web applications and distributed computing systems.
You dont need to be a seasoned veteran of the distributed object wars to appreciate this book, but some familiarity with Web-based architectures and techniques such as HTTP and HTML is assumed.
If you dont have any experience with these techniques, some of the material could be a little confusingparticularly some of the code examplesbut you should still be able to get a lot out of the book. If you need to supplement your under- standing of these techniques, many good books on programming with Java, JSP, servlets, and EJBs are available on the market. Although we devote an entire chapter to explaining the core pieces of XML needed to build Web services, the more understanding of XML you have, the more successful youll be in building Web services.
Philosophy The concepts and standards involved in Web services are very much interdependent.
Top 70 Web Services Interview Questions & Answers
Its difficult to cover each topic in isolation, because its the combination of these concepts and standards that makes Web services important to distributed computing. The philosophy of this book can be summarized by four points: pragmatics, progres- sive disclosure, a continuous example, and a service-oriented architecture framework. Pragmatics In this book, we try to get to programming examples and running code as quickly as possible.
Whereas we emphasize that Web services are fundamentally programming language neutral, ultimately, any given Web service is implemented in some programming language technology. In the case of this book, weve chosen Javaprobably not a surprise to you, given our title. Where issues of interoperability with Web services written in other programming languages appear, we note them.
Detailed coverage of other Web services implementation approaches, such as Microsofts. NET, is beyond the scope of this book. Progressive Disclosure After an overview of Web services, we start with the fundamentals of XML and then layer on new concepts, motivated by a business computing problem. These layers produce a series of Web services technology stacks. For each of the technologies and standards in the Web services arena, we focus on explaining the technology from the perspective of the problems it solves, balancing the explanation of the technology itself.
Services with Java
Business Example The technologies and standards that make up the Web services concept are each exam- ined in the context of an example which we discuss later in this introduction. The use of the example adds insight to the explanation of Web services in the text of the book and supports the progressive disclosure approach as we follow the example, adding the 3 Introduction layers of Web services technology to the solution.
This technique helps position various best-practices approaches to Web service development and deployment. You can down- load the source code for these running examples from www.
When you reach that page, enter this books ISBN number in the search box to access information about the book and a Downloads link.
We use the SOA framework to help position the various Web services concepts in the context of a bigger picture. Chapters 1 through 6 describe the core concepts of Web services; you need to have a thorough understanding of this subject matter to be successful with any Web services development project.
Chapters 7 through 12 are organized around Web services topics that have an enterprise computing focus. The topics discussed in this section address technical subjects that usually crop up when youre building real information technology solutions. The last part of the book, Chapters 13 through 15, deals with development pragmatics that weve gleaned from real-world experience with Web services.
Lets take a closer look at the topics in each of the chapters. Chapter 1 begins the book with an explanation of what the Web services approach is all about.
We describe what a Web service is, what standards and technologies are associ- ated with Web services, and what problems can be solved using Web services. This chapter will give you a solid conceptual basis for the rest of the book.
Because XML is at the heart of all the Web services standards and techniques, its important for you understand it well. XML is a huge topic, but we focus our examination of XML on what youll need to know in order to understand the rest of the Web services topics. SOAP forms the core basis of communication between a service requestor and a service provider in a Web services environment, and its the foundation on which you can build the kinds of business-level extensions well discuss later in the book.
This chapter discusses how Web services use service description to address the problem of communicating the details the service requestor needs to know about the Web service in order to properly understand how and why to invoke it.
This chapter dives into the details of how Axis works and how you can use it to both consume Web services and deploy your own. Now, you need to understand how the service requestor got the service description in the first place.
This chapter examines the standards related to finding what Web services are provided by businesses with which a company might want to collaborate. In Chapter 8, Web Services and Stateful Resources, we review how the notion of stateful resources can be combined with Web services, by introducing the concepts of WS-Addressing, a referencing or pointer mechanism in Web services; WS-Resource Framework, a specification for associating Web services with stateful resources; and WS- Notification, a mechanism for doing publish-subscribe style of asynchronous messaging.
This work is an emerging standard for use in Grid computing and systems management as well as e-business computing. In spite of the fact that the format for this Electronic Data Interchange EDI of messages is highly industry-specific and not particularly flexible, it is still the primary means of business-to-business B2B data exchange. Before the rise of the Internet, communication took place on expensive leased lines or private networks.
Now it is much cheaper to create a virtual private network VPN by sending encrypted data over the Internet, but the underlying messages still use EDI coding.
There are many industries that have an extensive investment in EDI and are going to be slow to change to Internet-based web services. Examples include hospitals, banks, and insurance companies.
Messaging Systems as Applications Recent years have seen the rise of major applications for the enterprise that can be called Message-Oriented Middleware MOM applications.
The Lotus company was one of the first to recognize that unifying the data communications for an enterprise could yield significant benefits and command a premium price. The success of the Lotus Notes application verified that corporations realized the benefits that could stem from this unification. As the communication channels used by enterprises have expanded to include e-mail, websites, fax, voice mail, the short message service on cellular phones, personal digital assistants, and the wireless Internet, the scope of messaging systems has expanded to keep up.
The way in which the information resources of an organization are viewed has shifted from emphasis on the giant mainframe database to emphasis on information flow within the organization, with customers, with suppliers, and with the public. It is widely anticipated that the value of B2B transactions on the Internet will continue to exceed the value of consumer transactions. The JMS package provides abstractions for message creation and delivery systems and encoding for simple data types.
Directory Systems An essential part of messaging systems are directories that let a potential client program locate the correct way to address a service.
Getting these directory services right is not a trivial task. Communicating Objects 5 As the number of web services increases rapidly, just finding the kind of service you need requires more and more effort. A number of initiatives to create these super directory services have been undertaken.
The objective of UDDI see www. Once you have located a service, you have to determine how that service wants to see requests formatted and how it will return results.
Before looking at these schemes, let me define some important terms: Interface Definition Language IDL The language used to specify the interface an object uses to communicate with the outside world. Marshalling The process of turning the structure of a program object into a stream of bytes is called marshalling. Serializing Another term for marshalling. Unmarshalling structure. Deserializing The process of turning a stream of bytes back into the original object Another term for unmarshalling.
Encoding Turning data items into a form that can be transmitted by a particular protocol. For example, to include the binary data that makes up an image in an XML message, the bytes must be encoded as characters compatible with XML tags.
Because the initial CORBA specification was released in , it has had quite a long time for refinement compared to other technologies.
SOAP vs REST Web Services
In spite of—or perhaps because of—its maturity, CORBA is considered a difficult programming technology to master.Otherwise you'll be taken to the web service page Figure At this point the urn: The setTargetObjectURI method of the call object is used to specify the name of the service, and setMethodName specifies the name of the method being invoked. Copy return Response. You send the request and get the response as part of a single transaction. Document style contains type and can be validated against predefined schema.
The non-interactive form is saved as a PDF file named Loan. Well annotate the first use of each term appearing in the glossary using the gsymbol.
Four very important factors led me to choose this implementation:
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