WSDL英文全称Web Services Description Language,中文翻译为Web服务描述语言,是为描述Web服务发布的XML格式。WSDL文档可以分为两部分:顶部分由抽象定义组成,而底部分则由具体描述组成。
WSDL(Web服务描述语言,Web Services Description Language)是为描述Web服务发布的XML格式。W3C组织(World Wide Web Consortium)没有批准1.1版的WSDL,当前的WSDL版本是2.0,是W3C的推荐标准(recommendation)(一种官方标准),并将被W3C组织批准为正式标准。
在诸多技术文献中通常将Web服务描述语言简写为WSDL,读音通常发为:"wiz-dəl"。
WSDL描述Web服务的公共接口。这是一个基于XML的关于如何与Web服务通讯和使用的服务描述;也就是描述与目录中列出的Web服务进行交互时需要绑定的协议和信息格式。通常采用抽象语言描述该服务支持的操作和信息,使用的时候再将实际的网络协议和信息格式绑定给该服务。
组成
WSDL 文档可以分为两部分。顶部分由抽象定义组成,而底部分则由具体描述组成。
元素
WSDL 元素基于XML语法描述了与服务进行交互的基本元素:
Type(消息类型):数据类型定义的容器,它使用某种类型系统(如 XSD)。
Message(消息):通信数据的抽象类型化定义,它由一个或者多个 part 组成。
Part:消息参数
-
Operation(操作):对服务所支持的操作进行抽象描述,WSDL定义了四种操作:
1、单向(one-way):端点接受信息;
2、请求-响应(request-response):端点接受消息,然后发送相关消息;
3、要求-响应(solicit-response):端点发送消息,然后接受相关消息;
4、通知(notification):端点发送消息。
Port Type(端口类型):特定端口类型的具体协议和数据格式规范。
Binding:特定端口类型的具体协议和数据格式规范。
Port:定义为绑定和网络地址组合的单个端点。
Service:相关端口的集合,包括其关联的接口、操作、消息等。
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