Posted on 2006-09-18 15:03
小小涼粉 閱讀(302)
評論(0) 編輯 收藏 所屬分類:
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
需要定位另一個應(yīng)用程序或者是網(wǎng)絡(luò)上的某一段業(yè)務(wù)邏輯，
client
通過
name
、
catagory
、
identifier
或者
specification
來從
UDDI registry
中查詢服務(wù)，定位以后，
client
從
UDDI registry
中得到
WSDL
文檔的位置信息。在
WSDL
文檔的
XML schema
中包含了如何訪問
web service
和請求信息的格式，
client
按照
xml schema
的格式來創(chuàng)建一個
soap
消息，并向
host
發(fā)送請求。