Posted on 2006-09-18 15:03
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JavaEE
1. SOAP--Simple Object Access Protocal
SOAP is a lightweight protocol intented to exchanging structured information in a decentralized, distributed environment.The two major goals for SOAP is simplicity and extensibility.
SOAP is widely used for XML messaging as it :
defines thin layer on top of widely understood HTTP
is flexible and extensible
enjoys broad industry and developer community support
Main uses of SOAP are for
messaging: sending XML data orders, invoices, forms
RPC: invoking services querying data sources, transacting
2. WSDL--Web Service Definition Language
As the communication protocols and message formats are standardized in the web community, it becomes increasingly possible and important to be able to describe the communication s in some structured way.WSDL addresses this need by defining an XML grammar for describing network services as collections of communication endpoints capable of exchanging messages.
3. UDDI-- Universal Description, Discovery, and Integration
UDDI protocol is a central element of the group of related standards that comprise the Web services stack. The specification defines a standard method for publishing and discovering the network-based software components of a service-oriented architecture.
4. the relationship between SOAP,WSDL and UDDI
web service client
需要定位另一个应用程序或者是网络上的某一段业务逻辑，
client
通过
name
、
catagory
、
identifier
或者
specification
来从
UDDI registry
中查询服务，定位以后，
client
从
UDDI registry
中得到
WSDL
文档的位置信息。在
WSDL
文档的
XML schema
中包含了如何访问
web service
和请求信息的格式，
client
按照
xml schema
的格式来创建一个
soap
消息，并向
host
发送请求。