随着 Web 服务技术的飞速发展，网络上出现了许多具有相同功能的 Web 服务，用户开始关注如何从这些具有相同功能的服务中寻找最优的 Web 服务。为了选择出最优服务，就需要对 QoS 综合评估进行大量的研究。当前的 QoS 综合评估方法有基于 QoS 序关系的综合评估和基于 QoS 属性值和用户偏好的综合评估两种。由于这两种方案自身特点的限制，不能适用于每一个服务选择场景。文中根据现实世界中的一些案例，提出了一种基于排名机制和用户偏好的 QoS 综合评估方法，该方法采用综合排名来作为评估 Web 服务质量的标准，解决了当前方法的一些不足和限制条件，能够满足对综合排名有较高要求的用户的需求，从而为 Web 服务选择提供了保证。%With the rapid development of Web services technology,many Web services with the same function appear in the network,us-ers started to pay attention to how to find the optimal Web service from the services with the same function. In order to find the optimal Web service,need to research the QoS-based comprehensive evaluation. QoS-based comprehensive evaluation methods have QoS orde-ring relation based comprehensive evaluation and QoS property values and user preferences based comprehensive evaluation in the pres-ent. Because of the restrictions of their own characteristics,the two methods can not be applied to each service selection scene. According to the comprehensive evaluation of cases in the reality,propose a ranking and user preferences based QoS evaluation method,the method uses comprehensive ranking as the standard to evaluate the quality of Web services,it resolves some shortcomings of the current methods, and it is able to meet the needs of users who have higher requirement for comprehensive ranking. So the method provides a guarantee for Web services selection.
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