CreateAnAJAXBasedFileuploadProgressbarDialog

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How to Create an AJAX based file upload progress-bar dialog

Create a struts based Appfuse project

C:\projects\appfuse-1.9.3-src\appfuse>ant new
Buildfile: build.xml

clean:
     [echo] Cleaning build and distribution directories

init:

new:
     [echo]
     [echo] +-------------------------------------------------------------+
     [echo] |    -- Welcome to the AppFuse New Application Wizard! --     |
     [echo] |                                                             |
     [echo] | To create a new application, please answer the following    |
     [echo] | questions.                                                  |
     [echo] +-------------------------------------------------------------+

    [input] What would you like to name your application [myapp]?
progressbar
    [input] What would you like to name your database [mydb]?
progressbar
    [input] What package name would you like to use [org.appfuse]?

    [input] What web framework would you like to use [webwork,tapestry,spring,jsf,struts]?
struts
     [echo] Creating new application named 'progressbar'...
     [copy] Copying 356 files to C:\projects\appfuse-1.9.3-src\progressbar
     [copy] Copying 81 files to C:\projects\appfuse-1.9.3-src\progressbar\extras
     [copy] Copying 1 file to C:\projects\appfuse-1.9.3-src\progressbar
     [copy] Copying 1 file to C:\projects\appfuse-1.9.3-src\progressbar

init:

fixcrlf:
     [echo] Running fixcrlf....
     [echo]
     [echo] +-------------------------------------------------------------+
     [echo] |           -- Application created successfully! --           |
     [echo] |                                                             |
     [echo] | Now you should be able to cd to your application and run:   |
     [echo] | > ant setup test-all                                        |
     [echo] +-------------------------------------------------------------+

BUILD SUCCESSFUL
Total time: 38 seconds
C:\projects\appfuse-1.9.3-src\appfuse>

C:\projects\appfuse-1.9.3-src\appfuse>cd ..

C:\projects\appfuse-1.9.3-src>cd progressbar

C:\projects\appfuse-1.9.3-src\progressbar>

C:\projects\appfuse-1.9.3-src\progressbar>ant setup-tomcat (if not done before. Only needed once)

C:\projects\appfuse-1.9.3-src\progressbar>ant setup-db

C:\projects\appfuse-1.9.3-src\progressbar>ant deploy

Start tomcat and see if it works. Create a user that you can use to login and test the functionality we are going to add.

Install the serverside classes

Extract the attached fileupload.zip (see bottom of this page) to < Your project folder >\src\web\org\appfuse\webapp\action

Listing the action folder must be like:

helge@duke /cygdrive/c/projects/appfuse-1.9.3-src/progressbar/src/web/org/appfuse/webapp/action
$ find .
.
./ActionExceptionHandler.java
./BaseAction.java
./fileupload
./fileupload/ExtendedMultiPartRequestHandler.java
./fileupload/FileUploadAction.java
./fileupload/upload
./fileupload/upload/MonitoredDiskFileItem.java
./fileupload/upload/MonitoredDiskFileItemFactory.java
./fileupload/upload/MonitoredOutputStream.java
./fileupload/upload/OutputStreamListener.java
./fileupload/upload/UploadInfo.java
./fileupload/upload/UploadListener.java
./fileupload/upload/UploadMonitor.java
./fileupload/util
./fileupload/util/UploadUtil.java
./PasswordHintAction.java
./ReloadAction.java
./SignupAction.java
./UploadAction.java
./UserAction.java

helge@duke /cygdrive/c/projects/appfuse-1.9.3-src/progressbar/src/web/org/appfuse/webapp/action
$ 

Create the formbean

Edit web.compile.classpath

1. Open the file < Your project folder >\properties.xml and find the element <path id="web.compile.classpath">
2. Add <pathelement location="${commons-fileupload.jar}"/> and <pathelement location="${dwr.jar}"/>

The reult should be

    <!-- Web -->
    <path id="web.compile.classpath">
        <pathelement location="${dist.dir}/${webapp.name}-dao.jar"/>
        <pathelement location="${dist.dir}/${webapp.name}-service.jar"/>
        <pathelement location="${struts.jar}"/>
        <pathelement location="${strutsmenu.jar}"/>
        <pathelement location="${displaytag.jar}"/>
        <pathelement location="${jakarta-oro.jar}"/>
        <pathelement location="${commons-digester.jar}"/>
        <pathelement location="${commons-logging.jar}"/>
        <pathelement location="${commons-beanutils.jar}"/>
        <pathelement location="${commons-collections.jar}"/>
        <pathelement location="${commons-fileupload.jar}"/>
        <pathelement location="${commons-lang.jar}"/>
        <pathelement location="${commons-validator.jar}"/>
        <pathelement location="${servletapi.jar}"/>
        <pathelement location="${commons-fileupload.jar}"/>
        <pathelement location="${dwr.jar}"/>        
        <fileset dir="${javamail.dir}" includes="*.jar"/>
        <fileset dir="${spring.dir}" includes="*.jar"/>
        <fileset dir="${jstl.dir}/lib" includes="jstl.jar"/>
    </path>

Configure decorators

<decorators defaultdir="/decorators">
    <excludes>
        <pattern>/resources/*</pattern>
        <pattern>/dwr/*</pattern>
        <pattern>/scripts/engine.jsp*</pattern>
    </excludes> 
    <decorator name="default" page="default.jsp">
        <pattern>/*</pattern>
    </decorator>
</decorators>

Configure DWR

Edit the file < Your project folder >\web\WEB-INF\dwr.xml so the content becomes:

<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"
    "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
  <!-- enable/disable dwr debug in web.xml where the servlet is mapped as 'dwr-invoker' -->  
  <allow>
        <!--create creator="spring" javascript="UserManager">
            <param name="beanName" value="userManager"/>
            <include method="getUsers"/>
        </create>
        <convert converter="bean" match="org.appfuse.model.User"/-->
        <create creator="new" javascript="UploadMonitor">
            <param name="class" value="org.appfuse.webapp.action.fileupload.upload.UploadMonitor"/>
        </create>
        <convert converter="bean" match="org.appfuse.webapp.action.fileupload.upload.UploadInfo"/>
    </allow>
</dwr>

Redeploy the changes with the command:

C:\projects\appfuse-1.9.3-src\progressbar>ant deploy

Test DWR

You will need to login (the default admin username/pw is: mraible/tomcat). And gets to the DWR test page. Click the UploadMonitor link. That page click on the Execute button.

The test should look like this image:

Change the struts controller

<controller nocache="true" inputForward="true" maxFileSize="100M" multipartClass="org.appfuse.webapp.action.fileupload.ExtendedMultiPartRequestHandler"/>

Configure Acegi

    <bean id="filterInvocationInterceptor" class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">
        <property name="authenticationManager" ref="authenticationManager"/>
        <property name="accessDecisionManager" ref="accessDecisionManager"/>
        <property name="objectDefinitionSource">
            <value>
                PATTERN_TYPE_APACHE_ANT
                /clickstreams.jsp*=admin
                /flushCache.*=admin
                /passwordHint.html*=ROLE_ANONYMOUS,admin,user
                /reload.*=admin
                /signup.html*=ROLE_ANONYMOUS,admin,user
                /users.html*=admin
                /**/*.html*=admin,user
                /scripts/engine.jsp*=ROLE_ANONYMOUS,admin,user
            </value>
        </property>
    </bean>

Redeploy the changes with the command:

C:\projects\appfuse-1.9.3-src\progressbar>ant deploy

Check that you can access the engine.jsp in a browser by opening the url http://< your host >:8080/scripts/engine.jsp (8080 is the default tomcat port, you may have changed this to 80 or somthing else)

You should see the javascript content of the engine.jsp in the browser

Create the form jsp, javascript and css files

Extract the attached fileupload-js.zip (see bottom of this page) to < Your project folder >\web\. You should now have following files (and the exsisting ones) in your < Your project folder >\web\ folder:

$ find .
.
./images
./images/ajax
./images/ajax/activity.gif
./images/ajax/indicator.gif
./images/ajax/Thumbs.db
./images/Thumbs.db
./pages
./pages/fileupload
./pages/fileupload/fileUploadForm.jsp
./scripts
./scripts/dwrupload
./scripts/dwrupload/dwrUpload.js
./scripts/dwrupload/lightboxDwrUpload.js
./scripts/engine.jsp
./styles
./styles/dwrupload
./styles/dwrupload/dwrUpload.css
./styles/dwrupload/lightboxDwrUpload.css

Redeploy the changes with the command:

C:\projects\appfuse-1.9.3-src\progressbar>ant deploy-web

Final test

Now point your browser to http://< your host >:8080/editUploadFile.html login and test that it works. (you may have to reload the browser to ensure it loads the css and js files (Ctrl + r in FireFox and IE) ). Remember to pick a file of a certain size if you are uploading to localhost. You should now see this image:

Comments and tips

• Change log4j to see whats going on. In the file log4j.properties change the line log4j.rootCategory=DEBUG, mail to log4j.rootCategory=DEBUG, R to get the log log messages written into a log file.

• Central files in this solution
  • FileUploadAction.java - the struts Action responsible for reciving the uploaded files and save them to disk
  • lightboxDwrUpload.js - The modified Lightbox Gone Wild! script used to fade the contend outside the upload dialog. This script looks copies the .innerHtml() from the div tag with id lbContent to the dialog. See next bullet.
  • fileUploadForm.jsp and lbContent - the jsp page containing the struts form. It contains a lbContent div tag which represent the html code inserted in the upload dialog. It also contains an embedded javascript with the function function upload(form) This script only trigger the upload mechanism if one or more files has been selected.
  • dwrUpload.js - This script is the Ajax functions that updates the content of the upload dialog. You can tweak the dialog refresh rate here.
  • ExtendedMultiPartRequestHandler.java - a slightly changed Struts controller (change marked by "Changed this section of code, that is it."). There is one important line here UploadListener listener = new UploadListener(request, 1); The '1' here means delay to 1 millisecond. By increasing this value uploads will take longer time but will also be less CPU intensive.
  • engine.jsp - is actually engine.js extracted from dwr1.x and tweaked to ensure dwr also works with cookies disabled. For details see "Support for DWR without cookies" http://getahead.ltd.uk/dwr/fixes. This issue is solved in version 2 of dwr.
  • lightboxDwrUpload.css - Here the opacity can be specified.
  • dwrUpload.css - Here the progress bar can be styled.

• Additional thoughts - I hope that this tutorial can serve as basis for integration into later Appfuse versions. It may also serve as a basis for similar tutorials for the other web frameworks that Appfuse provides. Actually it could be implemented in a servlet (See the original AJAX Upload progress monitor for Commons-FileUpload Example) instead of using the struts action and that servlet could be included in all the Appfuse versions to provide this functionality across the frameworks.

• Productivity - This page was created using one of Matt's productivity tips "I've found that cracking open a beer at 11 when I start helps me focus and quit worrying about all the other computer-related tasks I need to do." - but I must say I needed to extended tip with a Whiskey.
  

This tutorial is created by merging existing code into a new Appfuse project so I expect that the stuff work. In case of problems you can write to me at helge.tesgaard(a)gmail.com. Also write if you find typos or anything that can be explained better.

Enjoy file transfers!

Regards Helge

productivity.jpg		18309 bytes
FileUploadForm.java		2933 bytes
fileupload-js.zip		40613 bytes
fileupload.zip		14762 bytes
dwrLightboxFileupload.jpg		112283 bytes
DWRTest.jpg		155595 bytes
AjaxFileTransfer.jpg		93101 bytes