Beginner needs help with SOAP with attachments

[Julien Martin]

Hello,

I would like for a ws client to retrieve an image from a ws endpoint. I am totally confused as to what encoding style to choose as well as how to implement it.

Here is the code for the client:

package pack;
 

import java.awt.Image;
import java.io.*;
 
import javax.servlet.*;
import javax.servlet.http.*;
 
public class ServletFetchesAttachment extends HttpServlet {
    
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
  
        System.out.println("processRequest");
        
        PrintWriter out = response.getWriter();
        try { 
            Image img =  getProvidesAttachmentSEIPort().retrieveAttachment();
        } catch(java.rmi.RemoteException ex) {
            ex.printStackTrace();
        } catch(Exception ex) {
            ex.printStackTrace();
        }
        out.close();
    }
    
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
    
    private pack.ProvidesAttachment getProvidesAttachment() {
        pack.ProvidesAttachment providesAttachment = null;
        try {
            javax.naming.InitialContext ic = new javax.naming.InitialContext();
            providesAttachment = (pack.ProvidesAttachment) ic.lookup("java:comp/env/service/ProvidesAttachment");
        } catch(javax.naming.NamingException ex) {
            ex.printStackTrace();
        }
        return providesAttachment;
    }
    
    private pack.ProvidesAttachmentSEI getProvidesAttachmentSEIPort() {
        pack.ProvidesAttachmentSEI providesAttachmentSEIPort = null;
        try {
            providesAttachmentSEIPort = getProvidesAttachment().getProvidesAttachmentSEIPort();
        } catch(javax.xml.rpc.ServiceException ex) {
            ex.printStackTrace();
            
        }
        return providesAttachmentSEIPort;
    }
    
    
}
 

Here is the code for the endpoint:

package pack;
 
import java.awt.Image;
import java.awt.Toolkit;
import java.net.MalformedURLException;
import java.net.URL;
 

public class ProvidesAttachmentImpl implements ProvidesAttachmentSEI{
    
    public Image retrieveAttachment() throws java.rmi.RemoteException {
        URL url=null;
        Image image = null;
        try {
            url = new URL("file:///home//julien//tests//logo.gif");
            image = Toolkit.getDefaultToolkit().createImage(url);
                              
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }
        return image;
    }
    
}

Here is the wsdl:

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="ProvidesAttachment" targetNamespace="urn :-P	 rovidesAttachment/wsdl" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:ns2="http://java.sun.com/jax-rpc-ri/internal" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="urn :-P	 rovidesAttachment/wsdl" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <types>
    <schema targetNamespace="http://java.sun.com/jax-rpc-ri/internal" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:soap11-enc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:tns="http://java.sun.com/jax-rpc-ri/internal" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
      <simpleType name="image">
        <restriction base="base64Binary"/></simpleType></schema>
  </types>
  <message name="ProvidesAttachmentSEI_retrieveAttachmentResponse">
    <part name="result" type="ns2:image"/>
 
  </message>
  <message name="ProvidesAttachmentSEI_retrieveAttachment">
  </message>
  <portType name="ProvidesAttachmentSEI">
    <operation name="retrieveAttachment">
      <input message="tns :-P	 rovidesAttachmentSEI_retrieveAttachment"/>
      <output message="tns :-P	 rovidesAttachmentSEI_retrieveAttachmentResponse"/>
    </operation>
  </portType>
 
  <binding name="ProvidesAttachmentSEIBinding" type="tns :-P	 rovidesAttachmentSEI">
    <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
    <operation name="retrieveAttachment">
      <soap :-o	 peration soapAction=""/>
      <input>
        <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn :-P	 rovidesAttachment/wsdl" use="encoded"/>
      </input>
      <output>
        <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn :-P	 rovidesAttachment/wsdl" use="encoded"/>
 
      </output>
    </operation>
  </binding>
  <service name="ProvidesAttachment">
    <port binding="tns :-P	 rovidesAttachmentSEIBinding" name="ProvidesAttachmentSEIPort">
      <soap:address location="http://ordinateur:8080/WebAppProvidesAttachment/ProvidesAttachment"/>
    </port>
  </service>
</definitions>

Any help greatly appreciated.

Thanks in advance,

Julien.

[Ulf Dittmer]

This SAAJ introduction has a section specifically about transferring images.

[Julien Martin]

Hello Ulf,
I knew of the documentation you indicated and unfortunately it only deals with standalone clients... Here as you may have noticed my WS client is a servlet and it does not have access to the soap message. Only a handler would have access to the soap message and I could easily retrieve the attachment with a handler but then how do I make the attachment available to the servlet??
Any other idea?
Julien.

[Ulf Dittmer]

Whether a client is a standalone application or a web application makes no difference for the SOAP connection.

All WS implementations let you access the SOAP message in some way or other, at what point the SAAJ API can be used. If the objects you're working with don't provide that access, then it shouldn't be too hard to add that.
[ May 31, 2006: Message edited by: Ulf Dittmer ]