问Node.js:如何使用SOAP XML web服务

EN

const soap = require('soap');
const express = require('express');
const app = express();
/**
 * this is remote service defined in this file, that can be accessed by clients, who will supply args
 * response is returned to the calling client
 * our service calculates bmi by dividing weight in kilograms by square of height in metres
 */
const service = {
  BMI_Service: {
    BMI_Port: {
      calculateBMI(args) {
        //console.log(Date().getFullYear())
        const year = new Date().getFullYear();
        const n = args.weight / (args.height * args.height);
        console.log(n);
        return { bmi: n };
      }
    }
  }
};
// xml data is extracted from wsdl file created
const xml = require('fs').readFileSync('./bmicalculator.wsdl', 'utf8');
//create an express server and pass it to a soap server
const server = app.listen(3030, function() {
  const host = '127.0.0.1';
  const port = server.address().port;
});
soap.listen(server, '/bmicalculator', service, xml);

const express = require('express');
const soap = require('soap');
const url = 'http://localhost:3030/bmicalculator?wsdl';
const args = { weight: 65.7, height: 1.63 };
soap.createClient(url, function(err, client) {
  if (err) console.error(err);
  else {
    client.calculateBMI(args, function(err, response) {
      if (err) console.error(err);
      else {
        console.log(response);
        res.send(response);
      }
    });
  }
});

<definitions name="HelloService" targetNamespace="http://www.examples.com/wsdl/HelloService.wsdl" 
  xmlns="http://schemas.xmlsoap.org/wsdl/" 
  xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 
  xmlns:tns="http://www.examples.com/wsdl/HelloService.wsdl" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <message name="getBMIRequest">
    <part name="weight" type="xsd:float"/>
    <part name="height" type="xsd:float"/>
  </message>

  <message name="getBMIResponse">
    <part name="bmi" type="xsd:float"/>
  </message>

  <portType name="Hello_PortType">
    <operation name="calculateBMI">
      <input message="tns:getBMIRequest"/>
      <output message="tns:getBMIResponse"/>
    </operation>
  </portType>

  <binding name="Hello_Binding" type="tns:Hello_PortType">
    <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
    <operation name="calculateBMI">
      <soap:operation soapAction="calculateBMI"/>
      <input>
        <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:examples:helloservice" use="encoded"/>
      </input>
      <output>
        <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:examples:helloservice" use="encoded"/>
      </output>
    </operation>
  </binding>

  <service name="BMI_Service">
    <documentation>WSDL File for HelloService</documentation>
    <port binding="tns:Hello_Binding" name="BMI_Port">
      <soap:address location="http://localhost:3030/bmicalculator/" />
    </port>
  </service>
</definitions>

var http = require('http');
var http_options = {
  hostname: 'localhost',
  port: 80,
  path: '/LocationOfSOAPServer/',
  method: 'POST',
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Content-Length': xml.length
  }
}

var req = http.request(http_options, (res) => {
  console.log(`STATUS: ${res.statusCode}`);
  console.log(`HEADERS: ${JSON.stringify(res.headers)}`);
  res.setEncoding('utf8');
  res.on('data', (chunk) => {
    console.log(`BODY: ${chunk}`);
  });

  res.on('end', () => {
    console.log('No more data in response.')
  })
});

req.on('error', (e) => {
  console.log(`problem with request: ${e.message}`);
});

// write data to request body
req.write(xml); // xml would have been set somewhere to a complete xml document in the form of a string
req.end();