gSoap 的簡單應用

最近關注一些 Application Server 開發的問題，試用了一下 gSoap。

 

gSoap 實際上一個編譯器，包含兩個工具：

 

wsdl2h 用於將 WSDL 文件轉換成頭文件

 

soapcpp2 用於將頭文件轉換成編寫 SOAP 服務器和客戶端所需要的文件

 

還是從最簡單的 HelloWorld 程序來認識 gSoap

 

下面的是實現兩個整數相加的 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 );

 

需要執行的過程是：

 

soapcpp2.exe add.h

 

然後編寫服務器和客戶端的代碼。

 

爲了進一步瞭解 SOAP 底層的過程，可以截取數據包進行查看

 

客戶端發生的信息：

 

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>

 

服務器的響應信息：

 

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>

 

得到實際的 HTTP 信息之後，直接利用 python 可以很容易寫出客戶端的代碼

 

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)

 

 

之後嘗試利用 jQuery 編寫 ajax 代碼來訪問 SOAP 服務，悲劇的是居然有兼容性問題，只有 IE 能夠正常調用。

 

像 firefox 和 chrome 都會發送一些糟糕的 Internal Server Error。