理解WSDL

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WSDL是干什么的?
Web服务的定义语言.通过WSDL你可以告诉别人您能够提供什么服务,或者你能干什么. 首先，我提供一个WSDL的例子，这个例子源于Netbeans5.5的BPEL的贷款教程。

WSDL例子

xml version="1.0" encoding="UTF-8"?>
<definitions targetNamespace="http://j2ee.netbeans.org/wsdl/LoanRequestor"
    xmlns="http://schemas.xmlsoap.org/wsdl/"
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="LoanRequestor" xmlns:plink="http://schemas.xmlsoap.org/ws/2004/03/partner-link/" xmlns:tns="http://j2ee.netbeans.org/wsdl/LoanRequestor" xmlns:ns="http://xml.netbeans.org/schema/LoanRequestor">
    <types>
        <xsd:schema targetNamespace="http://j2ee.netbeans.org/wsdl/LoanRequestor">
            <xsd:import namespace="http://xml.netbeans.org/schema/LoanRequestor" schemaLocation="LoanRequestor.xsd"/>
        xsd:schema>
    types>
    <message name="LoanRequestorOperationRequest">
        <part name="requestLoanMessage" element="ns:pa"/>
    message>
    <message name="LoanRequestorOperationReply">
        <part name="responsePart" element="ns:par"/>
    message>
    <portType name="LoanRequestorPortType">
        <operation name="LoanRequestorOperation">
            <input name="input1" message="tns:LoanRequestorOperationRequest"/>
            <output name="output1" message="tns:LoanRequestorOperationReply"/>
        operation>
    portType>
    <binding name="LoanRequestorBinding" type="tns:LoanRequestorPortType">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
        <operation name="LoanRequestorOperation">
            <soap:operation/>
            <input name="input1">
                <soap:body use="literal"/>
            input>
            <output name="output1">
                <soap:body use="literal"/>
            output>
        operation>
    binding>
    <service name="LoanRequestorService">
        <port name="LoanRequestorPort" binding="tns:LoanRequestorBinding">
            <soap:address location="http://localhost:18181/LoanRequestorService/LoanRequestorPort"/>
        port>
    service>
    <plink:partnerLinkType name="LoanRequestorPartner">
         class --> package 给其他Java程序使用 
  Web: operation --> port type --> wsdl 给其他任何Web Service的客户端使用. 
  类比一下把.