Introduction to Web Services with Java by Kiet T. Tran. Publisher: Bookboon ISBN Number of pages: Description: This book. intro-web-services-java This book, which is based on lectures the author provided at Trident University International, focuses more on the. Kiet T. Tran is the author of Introduction to Web Services with Java ( avg rating , 0 ratings, 0 reviews, published ).
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Kiet T. Tran (Author of Introduction to Web Services with Java)
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Click on the ad to read moreDownload free eBooks at bookboon. Introduction to Web Services with Java PrefacePrefaceThis book, which is based on lectures I provided at Trident University International, focuses more on thedetails of a hands-on approach to Web Service programming than its specifications; however, in orderto help readers grasp the concept more easily, we provide a brief introduction to Web Service, SOAP,and WSDL in the first three chapters. Many details of the specifications are intentionally glossed over,however, so that the content remains manageable.
This book presents basic concepts of WS, protocolstack, and applications. WS is a software application identified by a URI whose interfaces and binding are introductkon of being defined,described, and discovered by XML artifacts, and it supports direct interactions with other softwareapplications using XML-based messages via Internet-based protocols W3C: WS is intoduction for machine-to-machine communication.
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WSDL is used to describethe service that an external application can call. UDDI is used to publish and advertise services so thatthey can found and used by others. This chapter provides an overview of Web Services. It presents a brief background of past enterprise integration difficulties and the benefits that a WS can offer. Using the example from the previous chapter i.
This chapter offers an in-depth look at how a service can be described and understood by others. A more complex WS application is then built upon the previous module exercise. Thus, readers are expected to have sufficient knowledgeof Java and XML. Database Configuration ParametersTable 2.
Server Configuration ParametersDownload free eBooks at bookboon. Describe basic elements jzva a Xervices Service application 2. Compare and contrast the purposes of Web and Web Service applications 3. Describe the benefits of Web Services 4. Certainly, thedevelopment of websites was introdjction however, static content can quickly witn outdated; thus, thecontent management of a website is important. Figure Early Web applicationsIn order to provide dynamic content to Web users, 2-tier web applications were realized with theintroduction of the Common Gateway Interface CGIwhich retrieves content from external dataresources, such as a database.
CGI acts as a client in the traditional client-server architecture. A CGIscript processes the request and returns the result to the Web server.
Introduction To Web Services With Java
The server then formats the contentsin HTML and returns to the browser for display. CGI suffered many drawbacks that necessitated changes to the 2-tier architecture. The database was oftenrunning on the same machine; therefore, making backups of the data was difficult. CGI was running as aseparate process, so it suffered from a context-switching penalty.
CGI was not designed for performance,security or scalability. Figure Two-tier web applicationDownload free eBooks at bookboon. In this architecture, middleware oran application server is introduftion to connect the Web server and the database more efficiently. Theperformance of an n-tier application is improved because Web lntroduction, middleware and databases canbe hosted by separate kieh.
Each tier can be replicated for the purposes of load balancing. Securityis also improved because data is not stored on the Web or application server, which makes it harder forhackers to gain access into the database where data is stored.
Figure An n-tier web architectureA web and an application servers are often run on the same machine; however, it is best practice oiet runthe database server on a separate machine. In a seb development environment, all three servers canbe hosted on a single machine. In this book, a server is often refered to a software application. Introduction to Web Services with Java Introduction1. Consider a typical use case of a person browsing the Internet by means of a browser.
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JSP is oriented toward the deliveryof webpages for the presentation layer. Figure Man-machine interactionThe Internet architecture was originally designed for human users. Computing resources on a web browser are often idle while the user is browsing theInternet. Ewb available resources prompted the idea of providing more robust web browsing experience.
In addition, the idea of business-to-business B2B data exchange model also became inntroduction feasible. Accordingly, the WS architecture was introduced to support this new type of data exchange.
A restaurant service is an example of man-to-man interaction. Machine-to-machine interaction is exemplified by a handheld device, such as a smart device e. A Web Service is a type of machine-to-machineinteraction that uses specific Introduchion standards and technology.
A Web Service is a set of programminginterfaces, not a set of webpages. This section begins with a basic definition of a Web Wit in order to establish a basic understandingfor use in later chapters. More complex aspects of Web Services will be easier to understand when thebasic concept of a Web Service is properly explained. According to W3C website, http: A Web Service is a software application identified by a URI whose interfaces and binding are capable of being defined, described and discovered by XML artifacts and [that] supports direct servicea with other software applications using XML based messages via Internet-based protocols.
Other transport protocols may be used, but HTTP is the most common one being used. HTTP, thus, isused throughout this text. A Web Service is a software application that requires interaction with another application.
WS is asoftware integration technique for a B2B type of integration. Here, one application acts as a serviceprovider server and the others act as service consumers clients.
This is a many-to-one relationship. For example, in Java, an interface can bedefined and then implemented by a concrete class. According to the specification of WSDL serices. SGML is a metalanguage,i.
Introductiom, XML facilitatesthe data and document processing functions. As its name tto is a lightweight protocol that can be used to exchange structured messages i. A service can be defined, published and discovered using some type of klet registry. UDDI is usually a good idea; however, it is notwidely used except in a private network of services. Introduction to Web Services with Java IntroductionRPC is a powerful technique that provides distributed computing capabilities across a network ofmachines.
RPC is a form of interprocess communication that enables function calls between applicationsthat are located across different or the same locations over a network.
It is best suited for client-serverprogramming. Integrating existing applications for a business solution is a complex and time-consuming task. Integrating these applications is also challenging. Applications runningon machines that are interconnected through a network are also difficult to integrate.
The challenges ofEAI arise in three main areas: Introduction to Web Services with Java IntroductionWS can serve as an enabling technology for application integration. WS, as mentioned earlier, placesthes following major standards in focus: Introduction to Web Services with Java IntroductionService requester — the client that consumes or requests the serviceService provider — the entity that implements the service and fulfill the service requestsService registry — a listing like a phonebook where available services are listed and described in fullFigure Web Service Architecture careers.
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Web Services are now available in nearly all platforms: Reuse of existing networking infrastructure: Loose-coupling of software components promotes software reuse 4.
Reduced integration cost and increased integration speed 5.