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From conflue...@apache.org
Subject [CONF] Apache ServiceMix: 7.05. Intermediate - Writing the marshaler class (page edited)
Date Tue, 29 Jan 2008 18:46:00 GMT
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/******* Edit Page Styles *******/
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/SM">SM</a> :
            <a href="http://cwiki.apache.org/confluence/display/SM/7.05.+Intermediate+-+Writing+the+marshaler+class">7.05. Intermediate - Writing the marshaler class</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/SM/7.05.+Intermediate+-+Writing+the+marshaler+class">7.05. Intermediate - Writing the marshaler class</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~bsnyder">Bruce Snyder</a>
            <span class="smallfont">(Jan 29, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=71691&originalVersion=13&revisedVersion=14">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="7.05.Intermediate-Writingthemarshalerclass-Writingthemarshalerclass"></a>Writing the marshaler class</h1>

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/*]]>*/</style><div class="Scrollbar"><table class='ScrollbarTable'><tr><td class='ScrollbarPrevIcon'><a href="/confluence/display/SM/7.04.+Intermediate+-+Configuring+the+http+consumer+SU"><img border='0' align='middle' src='/confluence/images/icons/back_16.gif' width='16' height='16'></a></td><td width='33%' class='ScrollbarPrevName'><a href="/confluence/display/SM/7.04.+Intermediate+-+Configuring+the+http+consumer+SU">7.04. Intermediate - Configuring the http consumer SU</a>&nbsp;</td><td width='33%' class='ScrollbarParent'><sup><a href="/confluence/display/SM/7.+Intermediate+-+Writing+a+http+upload+application"><img border='0' align='middle' src='/confluence/images/icons/up_16.gif' width='8' height='8'></a></sup><a href="/confluence/display/SM/7.+Intermediate+-+Writing+a+http+upload+application">7. Intermediate - Writing a http upload application</a></td><td width='33%' class='ScrollbarNextName'>&nbsp;<a href="/confluence/display/SM/7.06.+Intermediate+-+Creating+the+http+handler+SU">7.06. Intermediate - Creating the http handler SU</a></td><td class='ScrollbarNextIcon'><a href="/confluence/display/SM/7.06.+Intermediate+-+Creating+the+http+handler+SU"><img border='0' align='middle' src='/confluence/images/icons/forwd_16.gif' width='16' height='16'></a></td></tr></table></div>
<p>We now have to write the marshaler class to handle incoming and outgoing data.</p>

<h3><a name="7.05.Intermediate-Writingthemarshalerclass-Creatingthemarshalerclass"></a>Creating the marshaler class</h3>
<h4><a name="7.05.Intermediate-Writingthemarshalerclass-PreparinganEclipseproject"></a>Preparing an Eclipse project</h4>
<p>In order to ease the development we will now make use of Mavens ability to create Eclipse projects. From the http-consumer-su main folder run the following comand:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">mvn eclipse:clean eclipse:eclipse</pre>
</div></div>
<p>This will cleanup any existing Eclipse config (<b>eclipse:clean</b>) and create a new eclipse project (<b>eclipse:eclipse</b>).<br/>
When done it should post something like:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5 seconds
[INFO] Finished at: Wed Nov 28 12:21:12 CET 2007
[INFO] Final Memory: 14M/78M
[INFO] ------------------------------------------------------------------------</pre>
</div></div>

<h4><a name="7.05.Intermediate-Writingthemarshalerclass-ImportingtheprojectintoEclipse"></a>Importing the project into Eclipse</h4>
<p>Now it's time to start up Eclipse workbench. Choose <b>File &gt; Import &gt; Existing Projects into Workspace</b>.<br/>
Then select the projects root directory and press OK. A project named <b>http-consumer-su</b> should now be visible inside the Import window's projects list. Make sure it's checkbox is selected and press finish.<br/>
The project should now appear in your Package Explorer view.</p>

<p>Be sure you have specified the <b>M2_REPO classpath variable</b> to point on your local Maven repository which is located in your home folder.<br/>
For example: /home/lhe/.m2/repository<br/>
If you don't know how to specify this variable refer to the Eclipse documentation or Google it.</p>

<h4><a name="7.05.Intermediate-Writingthemarshalerclass-Createthemarshalerclassfile"></a>Create the marshaler class file</h4>
<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Important note</b><br />
<p>Until now we have just used our service unit to configure the behaviour of the JBI http-bc. Now we are going to extend the functionlity of this http binding component. To do this we will implement our own marshaler, which will handle incoming and outgoing messages.</p></td></tr></table>
<p>For this select the src/main folder in your project. Now create a new folder under main called java. Add this new folder to your source folders.  <br/>
If you did it correctly the new folder should show up as src/main/java right below the src/main/resources folder.</p>

<p>Now select the new folder and select <b>File &gt; New &gt; Class</b>. In the dialog enter the following:</p>

<p><b><div class="code"><div class="codeContent">
<pre class="code-java">Package:    org.apache.servicemix.jbi
Name:       HTTPMarshaler
Superclass: org.apache.servicemix.http.endpoints.DefaultHttpConsumerMarshaler</pre>
</div></div></b><br/>
Then hit <b>Finish</b> to create the class.</p>

<h4><a name="7.05.Intermediate-Writingthemarshalerclass-AbouttheDefaultHttpConsumerMarshaler"></a>About the DefaultHttpConsumerMarshaler</h4>
<p>The class DefaultHttpConsumerMarshaler implements the interface HttpConsumerMarshaler and is used as default marshaler on http:consumer endpoints <br/>
if nothing else is defined. <br/>
The interface HttpConsumerMarshaler contains the following method declarations:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> <span class="code-keyword">interface</span> HttpConsumerMarshaler {

    MessageExchange createExchange(HttpServletRequest request, ComponentContext context) <span class="code-keyword">throws</span> Exception;

    void sendOut(MessageExchange exchange, NormalizedMessage outMsg, HttpServletRequest request,
        HttpServletResponse response) <span class="code-keyword">throws</span> Exception;

    void sendFault(MessageExchange exchange, Fault fault, HttpServletRequest request, HttpServletResponse response)
        <span class="code-keyword">throws</span> Exception;

    void sendError(MessageExchange exchange, Exception error, HttpServletRequest request, HttpServletResponse response)
        <span class="code-keyword">throws</span> Exception;

    void sendAccepted(MessageExchange exchange, HttpServletRequest request, HttpServletResponse response)
        <span class="code-keyword">throws</span> Exception;

}</pre>
</div></div>

<p>The createExchange method is invoked on incoming data that is accepted. So this will be one method to override in our marshaler.<br/>
Another method which is interesting for us is the sendOut method. This method is used to send an answer back to the client and will be overridden as well. <br/>
All other methods are out of scope of this tutorial and will be untouched.</p>

<h3><a name="7.05.Intermediate-Writingthemarshalerclass-HTTPMarshaler"></a>HTTPMarshaler</h3>
<p>As said above we just subclass the DefaultHttpConsumerMarshaler to have only to code as less as possible.<br/>
We just override now the methods createExchange and sendOut to fit our needs.</p>

<h4><a name="7.05.Intermediate-Writingthemarshalerclass-createExchange%28%29"></a>createExchange()</h4>
<p>We will use the commons-fileupload lib to have a multipart-formdata parser out-of-box.<br/>
The below code shows how it is checked if the request is a multipart-formdata request and the data is extracted. <br/>
Finally we create a message exchange and fill it with a dummy content and the uploaded file in the attachment.</p>

<div class="code"><div class="codeHeader"><b>createExchange method with additional comments</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> MessageExchange createExchange(HttpServletRequest request, ComponentContext context) <span class="code-keyword">throws</span> Exception
        {
        <span class="code-comment">// create a message exchange with the set <span class="code-keyword">default</span> MEP
</span>        MessageExchange me = context.getDeliveryChannel().createExchangeFactory().createExchange(getDefaultMep());

        <span class="code-comment">// Check <span class="code-keyword">if</span> we have got a file upload request (multipart content)
</span>        <span class="code-object">boolean</span> isMultipart = ServletFileUpload.isMultipartContent(request);

        <span class="code-keyword">if</span> (isMultipart)
            {
            <span class="code-comment">// create the <span class="code-quote">"in"</span> message
</span>            NormalizedMessage in = me.createMessage();
            <span class="code-comment">// set a dummy content, otherwise the NMR will <span class="code-keyword">throw</span> errors - <span class="code-keyword">null</span> content not allowed
</span>            in.setContent(<span class="code-keyword">new</span> StringSource(<span class="code-quote">"&lt;payload/&gt;"</span>));

            <span class="code-comment">// Parse the request with the FileUploadServlet
</span>            List items = upload.parseRequest(request);

            <span class="code-comment">// <span class="code-object">Process</span> the uploaded items 
</span>            Iterator iter = items.iterator();
            <span class="code-keyword">while</span> (iter.hasNext())
                {
                FileItem item = (FileItem)iter.next();

                <span class="code-keyword">if</span> (item.isFormField())
                    {
                    <span class="code-comment">// <span class="code-keyword">this</span> item is a formular field
</span>                    processFormField(item, in);
                    }
                <span class="code-keyword">else</span>
                    {
                    <span class="code-comment">// <span class="code-keyword">this</span> item is a file content item
</span>                    processUploadedFile(item, in);
                    }
                }

            <span class="code-comment">// set <span class="code-keyword">this</span> in message as the <span class="code-quote">"in"</span> message of the message exchange
</span>            me.setMessage(in, <span class="code-quote">"in"</span>);
            }
        <span class="code-keyword">else</span>
            {
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> Exception(<span class="code-quote">"Request is not a valid multipart message"</span>);
            }

        <span class="code-comment">// <span class="code-keyword">finally</span> <span class="code-keyword">return</span> the ready exchange to be sent
</span>        <span class="code-keyword">return</span> me;
        }</pre>
</div></div>

<h4><a name="7.05.Intermediate-Writingthemarshalerclass-sendOut%28%29"></a>sendOut()</h4>
<p>In this method we just take the first attachment in the message exchange and write it to a temporary file. <br/>
Afterwards the response header is set and the file is posted as stream into the response's output stream. <br/>
Notice that we make use of the sendError method of our super class to handle exceptions.</p>

<div class="code"><div class="codeHeader"><b>sendOut method with additional comments</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> void sendOut(MessageExchange exchange, NormalizedMessage outMsg, HttpServletRequest request,
            HttpServletResponse response) <span class="code-keyword">throws</span> Exception
        {
        <span class="code-comment">// define a DataHandler (see Java Activation Framework)
</span>        DataHandler dh = <span class="code-keyword">null</span>;

        <span class="code-comment">// <span class="code-keyword">if</span> the out message received has no attachments, then we send an error to the client
</span>        <span class="code-keyword">if</span> (outMsg.getAttachmentNames().isEmpty())
            {
            <span class="code-comment">// use the <span class="code-keyword">super</span> class method sendError to send an error to the client
</span>            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-comment">// and <span class="code-keyword">return</span>
</span>            <span class="code-keyword">return</span>;
            }

        <span class="code-comment">// get all attachment names from the out message
</span>        Set set = outMsg.getAttachmentNames();
        Iterator iterator = set.iterator();
        <span class="code-object">String</span> key = <span class="code-keyword">null</span>;
        <span class="code-keyword">if</span> (iterator.hasNext())
            {
            <span class="code-comment">// we are now only interested in the first attachment
</span>            key = iterator.next().toString();  <span class="code-comment">// <span class="code-keyword">this</span> resolves the key which is also the filename
</span>            dh = outMsg.getAttachment(key); <span class="code-comment">// <span class="code-keyword">this</span> will resolve the data handler (file content)
</span>            }
        <span class="code-keyword">else</span>
            {
            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-keyword">return</span>;
            }

        <span class="code-keyword">if</span> (dh == <span class="code-keyword">null</span>)
            {
            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-keyword">return</span>;
            }

        <span class="code-comment">// create a temporary file
</span>        File f = File.createTempFile(<span class="code-quote">"tmp_"</span>, key);
        <span class="code-comment">// open an output stream to <span class="code-keyword">this</span> file
</span>        FileOutputStream fos = <span class="code-keyword">new</span> FileOutputStream(f);

        <span class="code-comment">// now we use the FileUtil's copyInputStream method to copy the content of the data 
</span>        <span class="code-comment">// handlers data source into the output stream
</span>        FileUtil.copyInputStream(dh.getDataSource().getInputStream(), fos);
        <span class="code-comment">// and close the output stream afterwards
</span>        fos.close();

        <span class="code-comment">// now create a file data source with the temporary file
</span>        FileDataSource fds = <span class="code-keyword">new</span> FileDataSource(f);
        <span class="code-comment">// create a stream datasource with the input stream of the file data source, the 
</span>        <span class="code-comment">// content type is provided by a method of the FileDataSource 
</span>        StreamDataSource sds = <span class="code-keyword">new</span> StreamDataSource(fds.getInputStream(), fds.getContentType()); 
        <span class="code-comment">// then a <span class="code-keyword">new</span> datahandler is created with the stream datasource
</span>        DataHandler dhsds = <span class="code-keyword">new</span> DataHandler(sds);

        <span class="code-comment">// tells the response object to open a popup in the clients browser with the given 
</span>        <span class="code-comment">// filename (stored in key)
</span>        response.setHeader(<span class="code-quote">"content-disposition"</span>, <span class="code-quote">"attachment; filename=\"</span><span class="code-quote">" + key + "</span>\"");
        <span class="code-comment">// set the content type to what the FileDataSource determined automatically
</span>        response.setContentType(fds.getContentType());
        <span class="code-comment">// also set the length of the content
</span>        response.setContentLength((<span class="code-object">int</span>)f.length());

        <span class="code-keyword">try</span>
            {
            <span class="code-comment">// now get the output stream of the servlet to send data to the clients browser
</span>            ServletOutputStream sos = response.getOutputStream();
            <span class="code-comment">// use the writeTo method of the data handler to easy to output of the data 
</span>            <span class="code-comment">// into the servlets output stream
</span>            dhsds.writeTo(sos);
            <span class="code-comment">// <span class="code-keyword">finally</span> set the status of the response to OK
</span>            response.setStatus(HttpServletResponse.SC_OK);
            }
        <span class="code-keyword">catch</span> (Exception e)
            {
            logger.log(Level.WARNING, <span class="code-quote">"Exception occurred"</span> + e.getMessage(), e);
            }
        <span class="code-comment">// afterwards clean up the temporary file
</span>        f.deleteOnExit();
        }</pre>
</div></div>



<h4><a name="7.05.Intermediate-Writingthemarshalerclass-Thefinishedclass"></a>The finished class</h4>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>HTTPMarshaler.java</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> org.apache.servicemix.jbi;

<span class="code-keyword">import</span> java.io.File;
<span class="code-keyword">import</span> java.io.FileOutputStream;
<span class="code-keyword">import</span> java.io.IOException;
<span class="code-keyword">import</span> java.util.Iterator;
<span class="code-keyword">import</span> java.util.List;
<span class="code-keyword">import</span> java.util.Set;
<span class="code-keyword">import</span> java.util.logging.Level;
<span class="code-keyword">import</span> java.util.logging.Logger;

<span class="code-keyword">import</span> javax.activation.DataHandler;
<span class="code-keyword">import</span> javax.activation.DataSource;
<span class="code-keyword">import</span> javax.activation.FileDataSource;
<span class="code-keyword">import</span> javax.jbi.component.ComponentContext;
<span class="code-keyword">import</span> javax.jbi.messaging.MessageExchange;
<span class="code-keyword">import</span> javax.jbi.messaging.MessagingException;
<span class="code-keyword">import</span> javax.jbi.messaging.NormalizedMessage;
<span class="code-keyword">import</span> javax.servlet.ServletOutputStream;
<span class="code-keyword">import</span> javax.servlet.http.HttpServletRequest;
<span class="code-keyword">import</span> javax.servlet.http.HttpServletResponse;

<span class="code-keyword">import</span> org.apache.commons.fileupload.FileItem;
<span class="code-keyword">import</span> org.apache.commons.fileupload.disk.DiskFileItemFactory;
<span class="code-keyword">import</span> org.apache.commons.fileupload.servlet.ServletFileUpload;
<span class="code-keyword">import</span> org.apache.servicemix.http.endpoints.DefaultHttpConsumerMarshaler;
<span class="code-keyword">import</span> org.apache.servicemix.jbi.jaxp.StringSource;
<span class="code-keyword">import</span> org.apache.servicemix.jbi.messaging.MessageExchangeSupport;
<span class="code-keyword">import</span> org.apache.servicemix.jbi.util.ByteArrayDataSource;
<span class="code-keyword">import</span> org.apache.servicemix.jbi.util.FileUtil;
<span class="code-keyword">import</span> org.apache.servicemix.jbi.util.StreamDataSource;

<span class="code-keyword">public</span> class HTTPMarshaler <span class="code-keyword">extends</span> DefaultHttpConsumerMarshaler
{
    <span class="code-keyword">private</span> <span class="code-keyword">static</span> <span class="code-keyword">final</span> Logger logger = Logger.getLogger(HTTPMarshaler.class.getName());
    <span class="code-keyword">private</span> <span class="code-keyword">static</span> <span class="code-keyword">final</span> <span class="code-object">int</span> MAX_MEM_SIZE = 10 * 1024 * 1024;
    <span class="code-keyword">private</span> <span class="code-keyword">static</span> <span class="code-keyword">final</span> File TEMP_FOLDER = <span class="code-keyword">new</span> File(<span class="code-object">System</span>.getProperty(<span class="code-quote">"java.io.tmpdir"</span>));
    <span class="code-keyword">private</span> <span class="code-keyword">static</span> <span class="code-keyword">final</span> <span class="code-object">long</span> MAX_UPLOAD_SIZE = 1024 * 1024 * 100;

    <span class="code-keyword">private</span> DiskFileItemFactory factory;
    <span class="code-keyword">private</span> ServletFileUpload upload;

    /** 
     * constructor 
     */
    <span class="code-keyword">public</span> HTTPMarshaler()
        {
        <span class="code-keyword">super</span>(MessageExchangeSupport.IN_OUT);

        <span class="code-comment">// Create a factory <span class="code-keyword">for</span> disk-based file items 
</span>        factory = <span class="code-keyword">new</span> DiskFileItemFactory();

        <span class="code-comment">// Set factory constraints 
</span>        factory.setSizeThreshold(MAX_MEM_SIZE);
        factory.setRepository(TEMP_FOLDER);

        <span class="code-comment">// Create a <span class="code-keyword">new</span> file upload handler 
</span>        upload = <span class="code-keyword">new</span> ServletFileUpload(factory);

        <span class="code-comment">// Set overall request size constraint 
</span>        upload.setSizeMax(MAX_UPLOAD_SIZE);
        }

    <span class="code-keyword">public</span> MessageExchange createExchange(HttpServletRequest request, ComponentContext context) <span class="code-keyword">throws</span> Exception
        {
        MessageExchange me = context.getDeliveryChannel().createExchangeFactory().createExchange(getDefaultMep());

        <span class="code-comment">// Check that we have a file upload request 
</span>        <span class="code-object">boolean</span> isMultipart = ServletFileUpload.isMultipartContent(request);

        <span class="code-keyword">if</span> (isMultipart)
            {
            NormalizedMessage in = me.createMessage();
            in.setContent(<span class="code-keyword">new</span> StringSource(<span class="code-quote">"&lt;payload/&gt;"</span>));

            <span class="code-comment">// Parse the request 
</span>            List items = upload.parseRequest(request);

            <span class="code-comment">// <span class="code-object">Process</span> the uploaded items 
</span>            Iterator iter = items.iterator();
            <span class="code-keyword">while</span> (iter.hasNext())
                {
                FileItem item = (FileItem)iter.next();

                <span class="code-keyword">if</span> (item.isFormField())
                    {
                    processFormField(item, in);
                    }
                <span class="code-keyword">else</span>
                    {
                    processUploadedFile(item, in);
                    }
                }

            me.setMessage(in, <span class="code-quote">"in"</span>);
            }
        <span class="code-keyword">else</span>
            {
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> Exception(<span class="code-quote">"Request is not a valid multipart message"</span>);
            }

        <span class="code-keyword">return</span> me;
        }

    /** 
     * processes form fields 
     * 
     * @param item  the field 
     * @param msg   the in message 
     */
    <span class="code-keyword">private</span> void processFormField(FileItem item, NormalizedMessage msg)
        {
        <span class="code-object">String</span> name = item.getFieldName();
        <span class="code-object">String</span> value = item.getString();
        msg.setProperty(name, value);
        }

    /** 
     * processes file items 
     * 
     * @param item  the item 
     * @param msg   the in message 
     */
    <span class="code-keyword">private</span> void processUploadedFile(FileItem item, NormalizedMessage msg)
        {
        <span class="code-object">String</span> fieldName = item.getFieldName();
        <span class="code-object">String</span> fileName = item.getName();
        <span class="code-object">String</span> contentType = item.getContentType();
        <span class="code-object">boolean</span> isInMemory = item.isInMemory();
        <span class="code-object">long</span> sizeInBytes = item.getSize();

        DataHandler dh = <span class="code-keyword">null</span>;

        <span class="code-keyword">if</span> (isInMemory)
            {
            dh = <span class="code-keyword">new</span> DataHandler(<span class="code-keyword">new</span> ByteArrayDataSource(item.get(), item.getContentType()));
            }
        <span class="code-keyword">else</span>
            {
            <span class="code-keyword">try</span>
                {
                dh = <span class="code-keyword">new</span> DataHandler(<span class="code-keyword">new</span> StreamDataSource(item.getInputStream(), item.getContentType()));
                }
            <span class="code-keyword">catch</span> (IOException ioex)
                {
                dh = <span class="code-keyword">new</span> DataHandler(<span class="code-keyword">new</span> ByteArrayDataSource(item.get(), item.getContentType()));
                }
            }

        <span class="code-keyword">try</span>
            {
            msg.addAttachment(fileName, dh);
            }
        <span class="code-keyword">catch</span> (MessagingException e)
            {
            e.printStackTrace();
            }
        }

    <span class="code-keyword">public</span> void sendOut(MessageExchange exchange, NormalizedMessage outMsg, HttpServletRequest request,
            HttpServletResponse response) <span class="code-keyword">throws</span> Exception
        {
        DataHandler dh = <span class="code-keyword">null</span>;

        <span class="code-keyword">if</span> (outMsg.getAttachmentNames().isEmpty())
            {
            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-keyword">return</span>;
            }

        Set set = outMsg.getAttachmentNames();
        Iterator iterator = set.iterator();
        <span class="code-object">String</span> key = <span class="code-keyword">null</span>;
        <span class="code-keyword">if</span> (iterator.hasNext())
            {
            key = iterator.next().toString();
            dh = outMsg.getAttachment(key);
            }
        <span class="code-keyword">else</span>
            {
            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-keyword">return</span>;
            }

        <span class="code-keyword">if</span> (dh == <span class="code-keyword">null</span>)
            {
            sendError(exchange, <span class="code-keyword">new</span> Exception(<span class="code-quote">"Invalid answer from handler."</span>), request, response);
            <span class="code-keyword">return</span>;
            }

        File f = File.createTempFile(<span class="code-quote">"tmp_"</span>, key);
        FileOutputStream fos = <span class="code-keyword">new</span> FileOutputStream(f);

        FileUtil.copyInputStream(dh.getDataSource().getInputStream(), fos);
        fos.close();

        FileDataSource fds = <span class="code-keyword">new</span> FileDataSource(f);
        StreamDataSource sds = <span class="code-keyword">new</span> StreamDataSource(fds.getInputStream(), fds.getContentType());
        DataHandler dhsds = <span class="code-keyword">new</span> DataHandler(sds);

        response.setHeader(<span class="code-quote">"content-disposition"</span>, <span class="code-quote">"attachment; filename=\"</span><span class="code-quote">" + key + "</span>\"");
        response.setContentType(fds.getContentType());
        response.setContentLength((<span class="code-object">int</span>)f.length());
        <span class="code-keyword">try</span>
            {
            ServletOutputStream sos = response.getOutputStream();
            dhsds.writeTo(sos);
            response.setStatus(HttpServletResponse.SC_OK);
            }
        <span class="code-keyword">catch</span> (Exception e)
            {
            logger.log(Level.WARNING, <span class="code-quote">"Exception occurred"</span> + e.getMessage(), e);
            }
        f.deleteOnExit();
        }
}</pre>
</div></div>

<p>Feel free to play around with this class after you ran it once sucessfully. There is enough room for improvements.</p>

<p>Now the consumer SU is ready for work. Let's move on to the http-handler SU which handles the JBI messages from our consumer.</p>

<h3><a name="7.05.Intermediate-Writingthemarshalerclass-Proceedtothenextstep7.06.IntermediateCreatingthehttphandlerSU"></a><a href="/confluence/display/SM/7.06.+Intermediate+-+Creating+the+http+handler+SU" title="7.06. Intermediate - Creating the http handler SU">Proceed to the next step </a></h3>
<p><br clear="all" />
<br clear="all" /></p>
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/*]]>*/</style><div class="Scrollbar"><table class='ScrollbarTable'><tr><td class='ScrollbarPrevIcon'><a href="/confluence/display/SM/7.04.+Intermediate+-+Configuring+the+http+consumer+SU"><img border='0' align='middle' src='/confluence/images/icons/back_16.gif' width='16' height='16'></a></td><td width='33%' class='ScrollbarPrevName'><a href="/confluence/display/SM/7.04.+Intermediate+-+Configuring+the+http+consumer+SU">7.04. Intermediate - Configuring the http consumer SU</a>&nbsp;</td><td width='33%' class='ScrollbarParent'><sup><a href="/confluence/display/SM/7.+Intermediate+-+Writing+a+http+upload+application"><img border='0' align='middle' src='/confluence/images/icons/up_16.gif' width='8' height='8'></a></sup><a href="/confluence/display/SM/7.+Intermediate+-+Writing+a+http+upload+application">7. Intermediate - Writing a http upload application</a></td><td width='33%' class='ScrollbarNextName'>&nbsp;<a href="/confluence/display/SM/7.06.+Intermediate+-+Creating+the+http+handler+SU">7.06. Intermediate - Creating the http handler SU</a></td><td class='ScrollbarNextIcon'><a href="/confluence/display/SM/7.06.+Intermediate+-+Creating+the+http+handler+SU"><img border='0' align='middle' src='/confluence/images/icons/forwd_16.gif' width='16' height='16'></a></td></tr></table></div>
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