摘要：有时我们需要在WCF中做一些复杂数据处理和逻辑判断等，这时候就需要在NodeJS中调用WCF服务获取数据，这篇文件介绍如何在Node中调用WCF服务获取数据。
var xpath = require('xpath.js'); var dom = require('xmldom').DOMParser;
声明代理及拼接要发送的数据：
var BasicHttpBinding = require('wcf.js').BasicHttpBinding, Proxy = require('wcf.js').Proxy, binding = new BasicHttpBinding(), proxy = new Proxy(binding, 'http://localhost:3721/service'), message = "<Envelope xmlns='http://schemas.xmlsoap.org/soap/envelope/'>" + "<Header />" + "<Body>" + "<LoginVer xmlns='http://tempuri.org/'>" + "<name>admin</name><pwd>123456</pwd>"+//成对的参数 "</LoginVer>" + "</Body>" + "</Envelope>";
发送数据，并根据不同的返回类型转换数据为json：
proxy.send(message, "http://tempuri.org/service/IsAuth", function (response, ctx) { if (ctx && ctx.error) { callback(ctx.error, ''); return; } if(response.indexOf('s:Envelope')>0) { if (response.indexOf('xs:schema') > 0) { //返回数据为Table var start = response.indexOf('<DocumentElement'); var end = response.indexOf('</DocumentElement>'); if(start == -1){ callback(null,{table:[]}); }else{ var datas = response.slice(start, end + 18); converttabletojson(datas, function (err, data) { callback(err, data); }); } } else{ //返回数据为List var start = response.indexOf('<' + method + 'Result'); var end = response.indexOf('</' + method + 'Response'); if(end == -1){ callback(null,{list:[]}); }else{ var datas = response.slice(start, end); convertlisttojson(datas, method + 'Result', function (err, data) { callback(err, data); }); } } } else{ callback(new Error('404,Not Found Page')); } });
function converttabletojson(table, callback) { try { var doc = new dom().parseFromString(table), jsonr = []; var nodes = xpath(doc, '/DocumentElement/*'); nodes.forEach(function (item) { var row = {}; var childs = item.childNodes; for (var key in childs) { if (childs[key].localName) { var name = childs[key].localName; var value = childs[key].firstChild != null ? childs[key].firstChild.data : ' '; row[name] = value; } }; jsonr.push(row); }); doc = null; nodes = null; callback(null, {table: jsonr}); } catch (err) { doc = null; nodes = null; callback(err); } };
function convertlisttojson(lists,root, callback) { try { var doc = new dom().parseFromString(lists), jsonr = {}; var childdoc = doc.childNodes[0].childNodes; for(var i =0;i<childdoc.length;i++){ var rows = []; if(!childdoc[i].firstChild){ if(typeof childdoc[i].data === 'string'){ jsonr['mydata'] = jsonr['mydata'] || []; jsonr['mydata'].push(childdoc[i].data); } continue; }else if(typeof childdoc[i].firstChild.data === 'string'){ jsonr['mydata'] = jsonr['mydata'] || []; jsonr['mydata'].push(childdoc[i].firstChild.data ); continue; } var lsttagname = childdoc[i].firstChild.tagName, lstname = lsttagname.substr(lsttagname.indexOf(':')+1); if(lstname){ var lsts = childdoc[i].getElementsByTagName(lsttagname); for(var j =0;j<lsts.length;j++){ var item = lsts[j]; var childs = item.childNodes, row={}; for(var key in childs){ if(childs[key].localName) { var name = childs[key].localName; var value = childs[key].firstChild.data; row[name] = value; } }; rows.push(row); } jsonr[lstname] = rows; } } doc = null;nodes =null; callback(null,{list:[jsonr]}); }catch(err){ doc = null;nodes =null; callback(err); } };
以上两个方法是根据wcf返回不同的数据类型做相应的判断。以下是返回两种类型的数据的示例：
List:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<IsAuthResponse xmlns="http://tempuri.org/">
<IsAuthResult>yes</IsAuthResult>
</IsAuthResponse>
</s:Body>
</s:Envelope>
Table:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetDataResponse xmlns="http://tempuri.org/">
<GetDataResult xmlns:a="http://schemas.datacontract.org/2004/07/Model" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:scoreValue>
<a:ScoreValue><a:name>语文</a:name> <a:value>90</a:value> </a:ScoreValue>
<a:ScoreValue><a:name>数学</a:name><a:value>92</a:value></a:ScoreValue>
<a:ScoreValue><a:name>英语</a:name><a:value>83</a:value></a:ScoreValue>
</a:scoreValue>
</GetDataResult>
</GetDataResponse>
</s:Body>
</s:Envelope>