原文地址:http://blog.csdn.net/tropica/archive/2008/11/02/3203892.aspxhtml
恩,我想說的是,是否是常常有人在開發的時候,特別是和第三方有接口的時候,走的是SOAP協議,而後用戶給你一個WSDL文件,說按照上面的進行適配,嘿嘿,這個時候,要是你之前沒有開發過,確定會傻眼,那若是你想學習的話,就認真的看下面的講解咯:web
1、WSDL概述
WebServices Description Language (WSDL Web服務語言)是一個用於精確描述Web Service的文檔格式。
WSDL很是適合於用做代碼生成器,它可以讀取WSDL文檔,而且能夠爲訪問Web服務生成一個程序化的接口,大多數軟件供應商和主要的標準機構(包括 W3C、WS-I和OASIS)都支持WSDL。例如:JAX-RPC provider(例如:BEA Weblogic)經過API用WSDL生成相應的佔位程序;IBM WebSphere、Microsoft.NET以及Apache Axis都有本身的工具生成相關的代碼。下圖是一個例子:
編程
2、WSDL基本結構
WSDL文檔是一個遵循WSDL XML模式的XML文檔(文檔實例);相似於:SOAP文檔是一個遵循SOAP XML模式的XML文檔(文檔實例);
一個WSDL文檔的根元素是definitions元素,WSDL文檔包含7個重要的元素:types, import, message, portType, operations, binding和service元素。
3、WSDL聲明
3.1 XML聲明網絡
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WSDL的聲明必須定義成使用:UTF-8 或者UTF-16 編碼。ide
3.2 definition元素
全部WSDL文檔的根元素都是definition元素。 函數
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xmlns:xsd="http://www.w3.org/2001/XMLSchema"
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定義了targetNamespace命名空間,它爲在模式中顯式建立的全部新類型均聲明瞭XML命名空間,並且上面的例子中賦予了mh前綴。
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上面的例子中:message元素利用name屬性指定了標籤(例如:GetBookPriceRequest),這些標籤會自動使用targetNamespace的命名空間,標籤了的messages元素一般被稱爲定義。
文檔中的其餘元素用標籤和命名空間前綴去應用定義,例如上面的例子中:input元素是使用mh:GetBookPriceRequest來引用標籤GetBookPriceRequest。
3.3 Types元素
Types元素用做一個容器,定義了自定義的特殊數據類型,在聲明消息部分(有效負載)的時候,messages定義使用了types元素中定義的數據類型與元素。工具
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Types元素做爲一個容器,用來定義XML模式內置的數據類型(即複雜類型和定製的簡單類現,詳細見Web Service XML文章)中沒有描述的各類數據類型。例如:ISBN。
上面的例子中,types元素中直接嵌套了一個完整的W3C XML模式文檔,此文檔中targetNamespace必須是一個有效的非空值,並且必須屬於由WSDL文檔。
3.4 Import元素
Import元素可讓當前的文檔使用其餘WSDL文檔中指定命名空間中的定義。 post
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WSDL的import元素必須聲明兩個屬性,即namespace屬性和location屬性。
namespace屬性必須和正導入的WSDL文檔中聲明的targetNamespace相匹配。
location屬性必須指向一個實際的WSDL文檔。
4、WSDL抽象接口
Message、portType和operation元素用於描述Web服務的抽象接口,至關於JAVA或者C++中編程中的類的接口。其中 portType至關於類接口的名稱;operation至關於接口中包含的函數,message至關於函數的參數和返回值。
4.1 Message元素
Message元素描述了Web服務的有效負載。至關於函數調用中的參數和返回值。學習
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4.2 portType元素
PortType元素定義了Web服務的抽象接口,它能夠由一個或者多個operation元素,每一個operation元素定義了一個RPC樣式或者文檔樣式的Web服務方法。
4.3 operation元素
Operation元素要用一個或者多個messages消息來定義它的輸入、輸出以及錯誤。編碼
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4.4 WSDL消息交換模式(MEP)
Messaging Exchange Patterns(MEP)
Web服務中使用了四種消息交換模式,即請求/響應、單向、通知以及懇求/響應模式。大多數基於WSDL的web服務使用請求/響應和單向兩種模式。
WSDL經過operation元素的input/output來定義使用那種模式,若是有input+output+可選的fault參數,那就使用請求/響應模式;若是隻使用input,那就使用單向模式。
在通知模式中:Web服務將消息發送給客戶,但不等待回覆;通常客戶經過註冊來接收通知;在懇求/響應模式中相似通知模式,惟一的區別要期待客戶對Web服務的響應。
5、WSDL實現:binding元素
Binding元素將一個抽象的portType映射到一組具體的協議(SOAP或者HTTP)、消息傳遞樣式(RPC或者document)以及編碼樣式(literal或者SOAP encoding)。
Binding的相似於將接口或者函數的調用綁定到某種協議上:例如CORBA、COM或者RPC的方式,這裏使用SOAP協議。
5.1 soapbind:binding元素
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5.2 soapbind:operation元素
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5.3 soapbind:body元素
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5.4 soapbind:fault元素
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5.5 soapbind:header元素
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5.6 soapbind:headerfault元素
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6、WSDL實現:Service和Port元素
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