FLEX之简单评测

Flex采用GUI界面开发,使用基于XML的MXML语言。Flex具有多种组件,可实现Web Services,远程对象,drag and drop,列排序,图表等功能;FLEX内建动画效果和其它简单互动界面等。相对于基于HTML的应用(如PHP、ASP、JSP、ColdFuss),FLEX应用程序的工作流被大大改善。FLEX的语言和文件结构也试图把应用程序的逻辑从设计中分离出来。Flex服务器也是客户端和XML Web Services及远程对(Coldfusion CFCs,或Java类,等支持Action Message Format的其他对象)之间通讯的通路。     

Aspect-oriented Programming for Dynamic Web Service Selection,Integration and Management

In service-oriented computing, applications are often created by integrating third-party Web Services. Current integration approaches, however, require client applications to hardcode references to specific Web Services, thereby affecting adaptability and robustness. Moreover, support for client-side management is rarely provided. To enable the development of more flexible and robust applications, we propose to insert a new layer between the client applications and the Web Services: the Web Services Management Layer (WSML). This layer decouples Web Services from client applications and enables hot-swapping between semantically equivalent Web Services based on availability. This mechanism allows for dynamic switching between Web Services based on selection policies that encapsulate changing business requirements. In addition, with WSML, client-side management concerns (e.g., caching, billing and logging) can be decoupled from the applications. In this paper, we identify a list of requirements for WSML to realize dynamic integration and client-side service management, and provide support for service criteria to govern the selection, integration and composition of Web Services. We also show that dynamic Aspect-Oriented Programming (AOP) is well suited to implement the core functionality of WSML.     

Web Services 互操作性研究

异构Web Services间的无缝互操作是成功构建基于Web Services应用的关键之一.讨论了Web Services互操作性概要和Web Services基本交互模式,详细分析了Web Services互操作原理和Web Services描述;说明了Web Services的类型定义中的类型不匹配、不可用类型、精度和值/引用类型等问题对互操作性的影响,并给出了处理方案;同时还分析了在Web Services的调用过程中采用的SOAP编码和消息模式、Web Services约束等问题.最后针对当前应用较广泛J2EE和.NET的两个平台的Web Services的互操作设计作了简要设计.     

基于NuSOAP及Google Search API搜索技术的研究与实现

Web Services已经成为目前解决分布式系统的主流技术。Google搜索引擎基于Web Services技术为开发者提供了Google Search API,使得开发人员可以在应用程序当中通过与Google Web服务的访问,来获取搜索服务。本文阐述如何在PHP集成开发环境下,利用NuSOAP组件访问Google Search API,构建PHP环境下搜索系统的方法和技术。     

基于HTML5的网页地图设计和应用

网络地理信息系统（WebGIS）综合应用网络与网页服务,应用ArcGIS软件相对标准地图完成加工设计,系统需要的地理数据库和地理数据处理过程进行分类概述。超文本标识语言（HTML）第5版加强和提高网络和网页软件应用开发的技术标准,优化网页结构基础元素,也是网页地图设计的基础编程语言。运用HTML和JAVASCRIPT对网页地图模块进行程序设计,并测试网页应用功能和模块操作应用。深入分析网页地图命令工具和应用功能,表明网页服务开发地理信息的可行性。     

Design of service interfaces for e-business applications using data normalization techniques

Web Services are being increasingly used for implementing large-scale e-business applications, but at present there is a lack of comprehensive methodologies based on sound engineering principles that can guide designers of service-oriented applications. This lack of methodological support is likely to lead to poorly designed and difficult to maintain e-business applications. In this paper we describe a design method for service-oriented applications that applies data engineering principles and the theoretical framework of data normalization to service design to produce a set of orthogonal services with normalized interfaces. We consider the impact of increasing service granularity on cohesion and coupling of service operations, and discuss associated design trade-offs. We use a travel example based on the Open Travel Alliance specification to illustrate how a document-oriented standard can be transformed into a set of well-designed service interfaces.     

Experiences developing architectures for realizing thin‐client diagram editing tools

Diagram‐centric applications such as software design tools, project planning tools and business process modelling tools are usually ‘thick‐client’ applications running as stand‐alone desktop applications. There are several advantages to providing such design tools as Web‐based or even PDA‐ and mobile‐phone‐based applications. These include ease of access and upgrade, provision of collaborative work support and Web‐based integration with other applications. However, building such thin‐client diagram editing tools is very challenging. We have developed several thin‐client diagram editing applications realized as a set of plug‐in extensions to a meta‐tool for visual design environment development. In this paper, we discuss key user interaction and software architecture issues, illustrate examples of interacting with our thin‐client diagram editing tools, describe our design and implementation approaches, and present the results of several different evaluations of the resultant applications. Our experiences will be useful for those interested in developing their own thin‐client diagram editing architectures and applications. Copyright © 2007 John Wiley & Sons, Ltd.     

Standards for second-generation portals

By integrating applications and resources, portals let users access information in a simple, straightforward manner. Currently, most portals let users create one or more personal pages composed of portlets - interactive Web mini-applications. Until recently, no standards for portlets existed, and thus consuming remote portlets in a generic way or deploying portlets in one portal server that were developed in a different one has been impossible. Two standards released in Fall 2003 - the Web Services for Remote Portlets (WSRP) and the Java portlet specification - address these problems. This articles outlines these standards and presents a typical architecture for a standards-based portal.     

基于Web服务的协同CASE工具设计

为CASE工具提供协同功能的重要性显而易见.但现有系统功能的实现不是使用ad-hoc的方法就是使用一个特定的群件工具箱,这使得应用程序缺少可扩展性和灵活性.使用Web Service技术及其协议提出一种开发CASE工具的新途径,以解决以上问题.为满足协同工作的完整需求,系统还包括一个版本控制机制和群体意识功能组件.简要介绍这种基于Web Service的体系结构并对核心的设计和实现议题进行描述.     

A Trust-Based Context-Aware Access Control Model for Web-Services

A key challenge in Web services security is the design of effective access control schemes that can adequately meet the unique security challenges posed by the Web services paradigm. Despite the recent advances in Web based access control approaches applicable to Web services, there remain issues that impede the development of effective access control models for Web services environment. Amongst them are the lack of context-aware models for access control, and reliance on identity or capability-based access control schemes. Additionally, the unique service access control features required in Web services technology are not captured in existing schemes. In this paper, we motivate the design of an access control scheme that addresses these issues, and propose an extended, trust-enhanced version of our XML-based Role Based Access Control (X-RBAC) framework that incorporates trust and context into access control. We outline the configuration mechanism needed to apply our model to the Web services environment, and provide a service access control specification. The paper presents an example service access policy composed using our framework, and also describes the implementation architecture for the system.This is an extended version of the paper that has been presented at the 3rd International Conference on Web Services (ICWS), San Diego, 6–9 July 2004.Recommended by: Athman Bouguettaya and Boualem Benatallah     

WebService Behavior技术及其应用研究

WebService Behavior是一种新的Web Services访问技术.在分析Web Services技术的基础上,从配属WebService Behavior、定位Web Services、Behavior对Web Services方法的调用及返回结果处理等方面深入研究了WebService Behavior调用原理.讨论了WebService Behavior技术在Web页面数据动态刷新、Web页面动画制作等方面的应用.     

Interactive information services using World-Wide Web hypertext

Most World-Wide Web information servers provide simple browsing access to collections of static text or hypertext files. This paper describes some interactive World-Wide Web servers that produce information displays and documents dynamically rather than just providing access to static files. The PARC Map Viewer uses a geographic database to create and display maps of any part of the world on demand. The Digital Tradition folk music server provides access to a large database of song lyrics and melodies. These applications take advantage of the multimedia capabilities of World-Wide Web to deliver graphical and audio content as well as formatted text. Hypertext links are used not only for navigation, but also for setting search and presentation parameters. In these applications the HTML format and the HTTP protocol are used like a user interface tool kit to provide not only document retrieval but a complete custom user interface specialized for the application.     

基于Web Services的MIS开发方式研究

探讨了传统MIS开发和维护问题、Web Services及其应用,将Web Services思想引入MIS开发方式中,建立了基于Web Services的MIS开发方式模型,通过构建基于Web Services思想的MIS开发平台并对一个简单的MIS进行测试开发,证实了Web Services解决MIS开发和维护问题的可行性。研究表明,Web Services思想是解决传统MIS开发和维护问题的一种较好的方法。     

The DynaRIA tool for the comprehension of Ajax web applications by dynamic analysis

Thanks to the fast and growing diffusion of Rich Internet Applications (RIAs), the user experience in the Web 2.0 is becoming more and more appealing and user friendly. RIAs are indeed a new generation of Web applications that exploit a combination of technologies and new development patterns for providing a more interactive, responsive and dynamic user experience. Unfortunately, some characteristics of RIAs, such as the heterogeneity of the implementation technologies, as well as the possibility of dynamically generating the code of the application, cause a general worsening of their analyzability and understandability. Consequently, specific analysis techniques and tools are needed for supporting their comprehension effectively. This paper presents an approach for the comprehension of RIAs implemented in Ajax that is based on a tool for dynamic analysis called DynaRIA. The tool provides an integrated environment for tracing application executions and analyzing them from several perspectives. Moreover, the tool is able to abstract several views on the structure and run-time behavior of the application that can be used in various comprehension activities. To show the actual support provided by DynaRIA in different comprehension contexts, four case studies involving two real Ajax applications will be illustrated in the paper. The experimental results showed the usefulness and effectiveness of the tool in comprehension, debugging, testing and quality assessment scenarios.     

利用J2EE实现Web Services模型与应用

WebServices是一种新颖的系统应用开发与集成技术并得到了越来越多的企业以及开发人员的青睐。该文简要阐述了WebServices的基本概念、模型以及在企业信息系统中的应用模型与实现,并以实例详细论述了WebServices系统的建立、设置与相关程序的编制。     

Enhancing the US Navy's GIDB Portal with Web Services

Using Web services, the authors have been able to increase the amount of data accessible through the Naval Research Laboratory’s Geospatial Information Database (GIDB) portal. They created a Web crawler for Web Mapping Services (WMS) that harvests and adds data to the portal index and a translator that provides access to non-WMS data through the WMS interface. The Integrated Web Services Broker, using traditional Web services standards, provides automated access to meteorological and oceanographic data.     

Applications of a Web query language

In this paper we report on our experience using WebSQL, a high level declarative query language for extracting information from the Web. WebSQL takes advantage of multiple index servers without requiring users to know about them, and integrates full-text with topology-based queries.The WebSQL query engine is a library of Java classes, and WebSQL queries can be embedded into Java programs much in the same way as SQL queries are embedded in C programs. This allows us to access the Web from Java at a much higher level of abstraction than bare HTTP requests.We illustrate the use of WebSQL for application development by describing two applications we are experimenting with: Web site maintenance and specialized index construction. We also sketch several other possible applications.Using the library, we have also implemented a client-server architecture that allows us to perform interactive intelligent searches on the Web from an applet running on a browser.     

Understanding Ajax applications by connecting client and server-side execution traces

Ajax-enabled Web applications are a new breed of highly interactive, highly dynamic Web applications. Although Ajax allows developers to create rich Web applications, Ajax applications can be difficult to comprehend and thus to maintain. For this reason, we have created FireDetective, a tool that uses dynamic analysis at both the client (browser) and server-side to facilitate the understanding of Ajax applications. We evaluate FireDetective using (1) a pretest-posttest user study and (2) a field user study. Preliminary evidence shows that the FireDetective tool is an effective aid for Web developers striving to understand Ajax applications.     

一种基于.NET AJAX框架跨域调用Web服务的方法

XMLHttpRequest(IE for XMLHTTP)对象是目前创建更富有交互性客户端的Ajax Web应用程序的关键。但在实际使用此对象跨域调用Web服务时在网络连接上却会受到Web浏览器的严重限制。本文利用ASP.NET AJAX框架设计并实现了一种通用的客户端跨域调用Web服务的方法。其主要工作原理是在本地服务器上建立服务代理来转发客户端的网络请求到异域的Web服务,而且使得客户端能够传递复杂数据并且安全地跨域调用Web服务。