最近关注一些 Application Server 开发的问题，试用了一下 gSoap。
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gSoap 实际上一个编译器，包含两个工具：
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wsdl2h 用于将 WSDL 文件转换成头文件
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soapcpp2 用于将头文件转换成编写 SOAP 服务器和客户端所需要的文件
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还是从最简单的 HelloWorld 程序来认识 gSoap
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下面的是实现两个整数相加的 SOAP 程序
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//gsoap ns service name: add
//gsoap ns service namespace: http://192.168.88.1/add.wsdl
//gsoap ns service location: http://192.168.88.1
//gsoap ns service executable: add.cgi
//gsoap ns service encoding: encoded
//gsoap ns schema namespace: urn:add
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int ns__add( int num1,int num2,int* sum );
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需要执行的过程是：
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soapcpp2.exe add.h
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然后编写服务器和客户端的代码。
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为了进一步了解 SOAP 底层的过程，可以截取数据包进行查看
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客户端发生的信息：
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POST / HTTP/1.0
Host: 192.168.88.1
User-Agent: gSOAP/2.1
Content-Type: text/xml; charset=utf-8
Content-Length: 438
SOAPAction: ""
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
?xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
?xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?xmlns:xsd="http://www.w3.org/2001/XMLSchema"
?xmlns:ns="urn:add" xmlns="urn:add" SOAP-ENV:encodingStyle="encoded">
<SOAP-ENV:Body>
<ns:add>
<num1>2</num1>
<num2>5</num2>
</ns:add>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
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服务器的响应信息：
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HTTP/1.0 200 OK
Server: gSOAP/2.1
Content-Type: text/xml; charset=utf-8
Content-Length: 438
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
?xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
?xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?xmlns:xsd="http://www.w3.org/2001/XMLSchema"
?xmlns:ns="urn:add" xmlns="urn:add" SOAP-ENV:encodingStyle="encoded">
<SOAP-ENV:Body><ns:addResponse>
<sum>7</sum>
</ns:addResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
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得到实际的 HTTP 信息之后，直接利用 python 可以很容易写出客户端的代码
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import urllib2
import sys,httplib
def SendRtx(num1,num2):
??? SENDTPL = /
??????????? '''<?xml version="1.0" encoding="UTF-8"?>
??? <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" ?xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ?xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns="urn:add" xmlns="urn:add" SOAP-ENV:encodingStyle="encoded">
??????? <SOAP-ENV:Body>
??????????? <ns:add>
??????????????? <num1>%s</num1>
??????????????? <num2>%s</num2>
??????????????? </ns:add>
??????? </SOAP-ENV:Body>
??? </SOAP-ENV:Envelope>'''
??? SoapMessage = SENDTPL % (num1,num2)
??? webservice = httplib.HTTP("192.168.88.1",4567)
??? webservice.putrequest("POST","/")
??? webservice.putheader("Host","192.168.88.1")
??? webservice.putheader("User-Agent","Python Post")
??? webservice.putheader("Content-type","text/xml; charset=/"UTF-8/"")
??? webservice.putheader("Content-length","%d" % len(SoapMessage))
??? webservice.putheader("SOAPAction","")
??? webservice.endheaders()
??? webservice.send(SoapMessage)
??? # get the response
??? statuscode,statusmessage,header = webservice.getreply()
??? print "Response: ",statuscode,statusmessage
??? print "headers: ",header
??? print webservice.getfile().read()
SendRtx(1,1)
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之后尝试利用 jQuery 编写 ajax 代码来访问 SOAP 服务，悲剧的是居然有兼容性问题，只有 IE 能够正常调用。
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像 firefox 和 chrome 都会发送一些糟糕的 Internal Server Error。
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