gSoap 的简单应用

最近关注一些 Application Server 开发的问题，试用了一下 gSoap。

gSoap 实际上一个编译器，包含两个工具：

wsdl2h 用于将 WSDL 文件转换成头文件

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

还是从最简单的 HelloWorld 程序来认识 gSoap

下面的是实现两个整数相加的 SOAP 程序

//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

int ns__add( int num1,int num2,int* sum );

需要执行的过程是：

soapcpp2.exe add.h

然后编写服务器和客户端的代码。

为了进一步了解 SOAP 底层的过程，可以截取数据包进行查看

客户端发生的信息：

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>

服务器的响应信息：

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>

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

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)

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。

像 firefox 和 chrome 都会发送一些糟糕的 Internal Server Error。

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