python 转化xml为json的一个小例子

Python将xml转化为json文件的一个小例子（apns-conf.xml是安卓系统中apn的配置文件）：

#!/usr/bin/pythonimport jsonimport base64import osfrom xml.etree import ElementTree#----------------------------------------------------# Global Variables#----------------------------------------------------srcRootPath = ''TargetISP = os.environ.get('TARGET_ISP')                  #os.environ.get()获取系统变量          if not TargetISP:   TargetISP = ''APNFileSrc = 'apns-conf.xml'           #apns-conf.xml文件所在路径APNTargetPath = 'apn.json'             #转化生成的apn.json文件的路径textString = '{\n'def printOtherValues(elem):    #   <apn carrier="Orange World"     #        mcc="208" mnc="01"    #        apn="orange"    #        user="orange"    #        password="orange"    #        server="http://www.orange.fr"    #        proxy="" port="" mmsc="" mmsproxy="" mmsport="" type="default,supl" authtype="1" spn="Orange F" mvno_type="spn" mvno_match_data="Orange F" protocol="IP"  roaming_protocol="IP" />    global textString    apnVars = ["carrier","apn","user","password","server","proxy","port","mmsc","mmsproxy","mmsport","type","authtype",'spn',"mvno_type","mvno_match_data","protocol","roaming_protocol"]                                     #使用数组apnVars来保存apn节点中的其它元素，有利于根据节点内容的电话增加或者删除元素    apnText = '\n    {'    typeString = '['    attributes = elem.attrib    for i in range(0,len(apnVars)) :                   #循环遍历apn节点中的其它元素                   if (apnVars[i] != 'type' and attributes.get(apnVars[i])) :            apnText += ('"'+ apnVars[i] + '"'+':' + '"%s",'%(elem.attrib[apnVars[i]]))        elif (apnVars[i] == 'type' and attributes.get(apnVars[i])) :            typeText = elem.attrib[apnVars[i]].split(",")            for item in typeText:                typeString += ('"' + item + '"' + ',')            typeString = (typeString[:-1] + ']')            apnText += ('"type"'+':%s,'%(typeString))    apnText = apnText[:-1]    apnText += '},'    textString += apnTextdef getMNCValues(mccValue,*elems):    global textString    mncValues = []    for elem in elems:        if (elem.attrib['mcc'] == mccValue):                                                 mncValues.append(elem.attrib['mnc'])                        #获取相同mnc值节点的mnc值，并保存在mncValues数组中    mncList = sorted(set(mncValues))    for mncValue in mncList:        textString += '  "'+mncValue+'": ['        for elem in elems:            if (elem.attrib['mcc'] == mccValue):                       if (elem.attrib['mnc'] == mncValue):                    #获取相同mcc、mnc值节点中的其它元素                    printOtherValues(elem)        textString = textString[:-1]        if (mncValue == mncList[-1]):            textString += '\n  ]\n'        else :            textString += '\n  ],\n'def xml2json(APNFileSrc):    global textString    mccValues = []    """Convert an ElementTree or Element into a JSON string."""    fIn = open(APNFileSrc, 'r')    text = fIn.read()    fIn.close()    elems = ElementTree.fromstring(text)                         #使用ElementTree解析xml文件                for elem in elems:                                           #获取节点中所有的mcc值，并保存在mccValues数组中        mccValues.append(elem.attrib['mcc'])    mccList = sorted(set(mccValues))                             #使用set去除数组中的重复元素，然后排序    for mccValue in mccList:        textString += '"'+mccValue+'": {\n'        getMNCValues(mccValue, *elems)                           #获取mcc值相同时的mnc值        textString += '},\n'    textString = textString[:-2]    textString += '\n}'    return textStringdef main():    if not os.path.exists(APNFileSrc):                              #当apns-conf.xml文件不存在时           print '------------------------------------'        print 'no apns_conf.xml.'        return    out = xml2json(APNFileSrc)                                #xml2json函数解析apns-conf.xml文件                                fOut = open(APNTargetPath, 'wb')    fOut.write(out.encode("utf-8"))    fOut.close()if __name__ == "__main__":    main()                           #python脚本的入口函数





apns-conf.xml文件转化成的json文件类似如下：apns-conf.xml:<apn carrier="Orange World"             mcc="208" mnc="01"            apn="orange"            user="orange” /> <apn carrier="Orange World"             mcc="208" mnc="01"            apn="apple"            user="apple"/> <apn carrier="Orange World"             mcc="208" mnc="03"            apn="hello"            user="hello"/> <apn carrier="Orange World"             mcc="211" mnc="03"            apn="world"            user="world"/>apn.json :{"208":{  "01":{    {"apn":"orange", "user":"orange"},    {"apn":"apple", "user":"apple"}  },  "03":{    {"apn":"hello", "user":"hello"}  }},"211":{  "03":{    {"apn":"world", "user":"world"}  }}