Question

i’m working with SOA using WebServices.
So i need to send a XML request to receive another XML with the response.

I create this class:

package com.ws.test;

import java.net.*;
import java.io.*;

public class SendXML {

    public static void main(String[] args) {

        try {
            String strSOAP = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";

            strSOAP += "<SOAP-ENV:Envelope ";

            strSOAP += " xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/";

            strSOAP += " xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/";

            strSOAP += " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance";

            strSOAP += " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema";

            strSOAP += " xmlns:ns=\"urn:bacnet_ws\">";

            strSOAP += " <SOAP-ENV:Body SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">";

            strSOAP += " <ns:getValue>";

            strSOAP += " <ns:options></ns:options>";

            strSOAP += " <ns:path>/.sysinfo/.vendor-name</ns:path>";

            strSOAP += " </ns:getValue>";

            strSOAP += " </SOAP-ENV:Body>";

            strSOAP += "</SOAP-ENV:Envelope>";


            //Create socket
            String hostname = "192.168.1.2";
            int port = 8080;
            InetAddress addr = InetAddress.getByName(hostname);
            Socket sock = new Socket(addr, port);

            //Send header
            String path = "/rcx-ws/rcx";
            BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream(), "UTF-8"));
            // You can use "UTF8" for compatibility with the Microsoft virtual machine.
            wr.write("POST " + path + " HTTP/1.0\r\n");
            wr.write("Host: 192.168.1.2\r\n");
            wr.write("Content-Length: " + strSOAP.length() + "\r\n");
            wr.write("Content-Type: text/xml; charset=\"utf-8\"\r\n");
            wr.write("\r\n");

            //Send data
            wr.write(strSOAP);
            wr.flush();

            // Response
            BufferedReader rd = new BufferedReader(new InputStreamReader(sock.getInputStream()));
            String line;
            while ((line = rd.readLine()) != null) {

                System.out.println(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

But this is not right because i receive this message error:

HTTP/1.1 500 Internal Server Error
Server: gSOAP/2.7 Content-Type:
text/xml; charset=utf-8
Content-Length: 570 Connection: close

SOAP-ENV:VersionMismatchSOAP
version mismatch or invalid SOAP
message

I need to send this parameter to the another system :

strSOAP += " <ns:getValue>";

strSOAP += " <ns:options></ns:options>";

strSOAP += " <ns:path>/.sysinfo/.vendor-name</ns:path>";

strSOAP += " </ns:getValue>";

How i could do that in Java ?

Best regards,
Valter Henrique.

Answer 1

If you insist on using sockets to transmit data, you’ll have to look at the SOAP specifications. For example, SOAP 1.1 requires the SOAPAction HTTP header. Use a tool like soapUI to check the validity of requests before you start writing code.

In general, you’d be better off using an existing client API (of which there are a few to choose). For example, you can easily use hand-crafted soap requests with JAX-WS.

A couple of notes:

---

The code leaks resources. Close your streams. See the try/finally pattern.

---

BufferedWriter wr = new BufferedWriter(
                     new OutputStreamWriter(sock.getOutputStream(), "UTF-8"));
//...
wr.write("Content-Length: " + strSOAP.length() + "\r\n");

This would not be safe for code points above U+007F as String.length() returns the number of code units in UTF-16. Content-Length should contain the length in bytes; not Java chars.