jstl provides use of the EL.
JSP 2.0 includes EL (Expression language) : "Personally I use the EL
extensively in all my JSP projects and I’ll never go back to custom tags or
scriptlets for showing the value of a request-scoped variable."
http://weblogs.java.net/blog/jfalkner/archive/2003/10/blarg_3_about_t.html
November 28, 2006
Posted by davidbloom |
Web Design |
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I downloaded Struts2 (2.0.1) for first time after experimenting with webworks.
My experience at this point with struts2/webworks is limited.
I figured I would start from scratch rather than migrating some old code.
C:\java\struts2\struts-2.0.1\apps
The sample apps they have are
struts2-blank-2.0.1.war
struts2-mailreader-2.0.1.war
struts2-portlet-2.0.1.war
struts2-showcase-2.0.1.war
User List
Contents of struts2-blank-2.0.1 war (folders in bold):
src
- example
– ExampleSupport.java: ExampleSupport extends com.opensymphony.xwork2.ActionSupport
– HelloWorld.java: HelloWorld extends ExampleSupport
- struts.properties: struts.devMode = true
struts.enable.DynamicMethodInvocation = false
- struts.xml: <!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
… <include file="example.xml"/>
- example.xml: <!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
… <package name="example" namespace="/example" extends="struts-default">
<action name="HelloWorld" class="example.HelloWorld">
<result>/example/HelloWorld.jsp</result>
</action>
<action name="Login!*" method="{1}" class="example.Login">
<result name="input">/example/Login.jsp</result>
<result type="redirect-action">Menu</result>
</action>
<action name="*" class="example.ExampleSupport">
<result>/example/{1}.jsp</result>
</action>
WebContent
- WEB-INF
--lib
— commons-collections-3.1
— freemarker-2.3.4
— spring-aop-1.2.8
— spring-context-1.2.8
— spring-web-1.2.8
— struts2-core-2.0.1
— commons-logging-1.0.4
— ognl-2.6.7
— spring-beans-1.2.8
— spring-core-1.2.8
— struts2-api-2.0.1
— xwork-2.0-beta-1
- example
The Struts 2 home page states the Struts 2 requires Java 5. However, an alternate set of jars for Java 1.4.x are available. The challenge here is for people using Java 1.4.X is that the sample apps come with the Java 5 jars.The java 4 jars can be found here. I extracted them to here:
C:\java\struts2\struts-2.0.1\j4\
But, the only file I needed from here was struts2-extras-j4-2.0.0.jar .
copy C:\java\struts2\struts-2.0.1\j4\struts2-extras-j4-2.0.0.jar
C:\java\eclipse\workspace\struts2-blank-2.0.1\WebContent\WEB-INF\lib
as I got the backport files from the nightlies:
http://people.apache.org/builds/jakarta-struts/nightlies/2.0.x/java-1.4/backport/
which i copied to
C:\java\eclipse\workspace\struts2-blank-2.0.1\WebContent\WEB-INF\lib
Then i modified the translate.bat as follows:
java -jar retrotranslator-transformer-1.0.8.jar -srcjar struts2-core-2.0.1.jar -destjar struts2-core-j4-2.0.1.jar
java -jar retrotranslator-transformer-1.0.8.jar -srcjar struts2-api-2.0.1.jar -destjar struts2-api-j4-2.0.1.jar
java -jar retrotranslator-transformer-1.0.8.jar -srcjar xwork-2.0-beta-1 -destjar xwork-2.0-j4.jar
The key thing is after the translate takes place to remove the following files:
- struts2-core-2.0.1.jar
- struts2-api-2.0.1.jar
- xwork-2.0-beta-1
Again, a Java 5 version of struts2-extras-j4-2.0.0.jar was not in the struts2-blank-2.0.1 war.
In Summary, my lib folder contains the following jars for 1.4.x:
— commons-collections-3.1
—commons-beanutils-1.6
— commons-digester-1.6
— commons-logging-1.0.4
— freemarker-2.3.4
— spring-aop-1.2.8
— spring-context-1.2.8
— spring-web-1.2.8
— retrotranslator-runtime-1.0.8
— retrotranslator-transformer-1.0.8
— ognl-2.6.7
— spring-beans-1.2.8
— spring-core-1.2.8
— struts2-core-j4-2.0.1
— struts2-api-j4-2.0.1
— xwork-2.0-j4
—struts2-extras-j4-2.0.0
— backport-util-concurrent
— translate.bat
Refer to this issue here
November 24, 2006
Posted by davidbloom |
Struts |
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I just downloaded the Apache Server on Windows which I have done a while ago alongside IBM’s websphere where they call it Http Server.
I ran the download program that pretty much self installs it. The executable for the Server can be found here
C:\Program Files\Apache Software Foundation\Apache2.2\bin
It appears a bunch of the configuration for server can be found here
C:\Program Files\Apache Software Foundation\Apache2.2\conf
httpd.txt: This is the main Apache HTTP server configuration file. It contains the
configuration directives that give the server its instructions.
Documentation gives details on the meaning of the information in the config file.
November 21, 2006
Posted by davidbloom |
SW Tools, Web Design |
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I have been reading up about Struts 2.
I figured checking out the webworks framework first might be a good idea.
API – http://www.opensymphony.com/webwork/api/allclasses-frame.html
Config Files – http://wiki.opensymphony.com/display/WW/Configuration+Files
C:\java\webworks\webwork-2.2.2\webapps>ant build -Dwebapp=shopping-cart
Buildfile: build.xml
build:
[delete] Deleting directory C:\java\webworks\webwork-2.2.2\webapps\tmp
[mkdir] Created dir: C:\java\webworks\webwork-2.2.2\webapps\tmp
[copy] Copying 58 files to C:\java\webworks\webwork-2.2.2\webapps\tmp
[javac] Compiling 13 source files to C:\java\webworks\webwork-2.2.2\webapps\
tmp\WEB-INF\classes
[copy] Copying 1 file to C:\java\webworks\webwork-2.2.2\webapps\tmp\WEB-INF
\classes
[war] Building war: C:\java\webworks\webwork-2.2.2\webapps\dist\shopping-c
art.war
[war] Warning: selected war files include a WEB-INF/web.xml which will be
ignored (please use webxml attribute to war task)
BUILD SUCCESSFUL
copy C:\java\webworks\webwork-2.2.2\webapps\dis
t\shopping-cart.war c:\java\apache-tomcat-5.5.17\webapps\
http://localhost:8080/shopping-cart/
learntechnology.net has a basic Webworks example (WAR).
Snippet from xworks.xml:
<default-interceptor-ref name="paramsPrepareParamsStack"/>
<action name="index" class="net.vaultnet.learn.action.EmployeeAction" method="list">
<result name="success">/jsp/employees.jsp</result>
<!– we don’t need the full stack here –>
<interceptor-ref name="basicStack"/>
</action>
<action name="crud" class="net.vaultnet.learn.action.EmployeeAction" method="input">
<result name="success" type="redirect-action">index</result>
<result name="input">/jsp/employeeForm.jsp</result>
<result name="error">/jsp/error.jsp</result>
</action>
- ActionMapper - mapping between HTTP requests and action invocation requests and
vice-versa; may return null if no action invocation request maps,
or it may return an ActionMapping.
- Filter Dispatcher (com.opensymphony.webwork.dispatcher.FilterDispatcher) – filter and its mapping are located in web.xml and defines what requests will be intercepted. Before executing an Action, it loooks through stack of interceptors.
Webworks Interceptors (defined in webwork-default.xml)can be invoked before and after your action is executed. paramsPrepareParamsStack- This is useful for when you wish to apply parameters directly to an object that you wish to load externally.
- <%@ taglib prefix="ww" uri="/webwork" %> : access to the tag library.
November 18, 2006
Posted by davidbloom |
Struts |
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After being a fan of Flickr for quite a while, and learning of the background of this product, i finally signed up for my own account . Thus, I am ready for the intro , should i be worried?
Another tool of note I enjoy is ITunes, not to be confused with M$FT ‘s Zune . I have not had this experinece with it. Here is one tip that I probably wont try, as I am more interested in setting up my playlists, as I have plenty of Podcasts on my player I listen to these but have not had a use for any .Podcast Tools or lessons on how to podcast . Listening to podcasts via a phone.
Update: Why Microsoft’s Zune music player has little or no chance of denting Apple’s iPod juggernaut [more]
November 14, 2006
Posted by davidbloom |
Web/Tech |
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OPEN JDK:"Santa Clara-based Sun said it is making nearly all of Java’s source
code — excluding small pockets of code that aren’t owned by Sun —
available under the GNU General Public License. The same type of
license also covers the distribution of the core, or kernel, of the
popular open-source operating system Linux" [q&a]
Why its good : "Java under the GPL means that they can now much more readily cross-leverage each other"
Sutor: "The most widely used license is the GNU General Public License (GPL).
While it is hard to quantify, it appears likely that approximately 70%
of all open source projects use the GPL. Code that uses the GPL is
referred to as “free software.”By its nature, the GPL makes new code that incorporates older GPLed
code also use the GPL. That is, the GPL is somewhat self-propagating as
code that uses it is picked up and re-used elsewhere. This is exactly
as the authors intended.The GNU/Linux operating systems use the GPL. You cannot charge
others for a license to use GPLed software and you must make your
source code available.
Another commonly used license is from the Apache Software
Foundation. This is an open source license that does allow direct use
of the source code within commercial products. Unlike the GPL, the Apache License
allows “defensive termination”: if you sue someone because you claim
that the software infringes on one of your patents, then you lose the
right to freely use the patents of others that are implemented in the
software.
In other words, you stop having the right to use the software if you
are trying to stop others from using it. Much of the open source
software that implements the standards of the World Wide Web is covered
under the Apache license."
freeopen-vs-closed-software
Details of what is available:
The first pieces of source code are available today:
* Java HotSpot technology (JVM)
* Java programming language compiler (javac)
* JavaHelp software
* Sun’s feature phone Java ME implementation
* Java ME testing and compatibility kit framework
Later in 2006, Sun will release these pieces:
* An advanced operating system phone implementation
* The framework for the Java Device Test Suite
Finally, in the first quarter of 2007 the move to free software will be completed as Sun provides these pieces under the GPL:
* A buildable Java SE Development Kit (JDK)
* Project GlassFish (in addition to CDDL)
Duke Open Sourced.
IBM’s take is one of dissapointment but one opinion: "What IBM holds back for its clients only gives it an advantage over
everyone else, especially among the large accounts that can afford its
overhead.The Apache license accepts this reality. The GPL does not. Behind
IBM’s mild complaint is a scream of pain, an acknowledgement that Sun
has cleverly kicked it in the shins."
November 13, 2006
Posted by davidbloom |
J2EE |
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about this time last year I started exploring the buzz word web 2.0
the Web 2.0 Summit was just held this past week [pod].
Now there is talk of the Web 3.0 : "Back to Web 3.0. There will be one, and it has been associated at this point with concepts of the semantic Web".
Nova Spivack defined the semantic Web :
The Semantic Web is a set of technologies which are
designed to enable a particular vision for the future of the Web – a
future in which all knowledge exists on the Web in a format that
software applications can understand and reason about. By making
knowledge more accessible to software, software will essentially become
able to understand knowledge, think about knowledge, and create new
knowledge. In other words, software will be able to be more intelligent
– not as intelligent as humans perhaps, but more intelligent than say,
your word processor is today.
The blog readwriteweb.com had a nice web2.0 roundup :
web 2.0 vs 1.0
Here is a link to many of the web 2.0 tools .
I personally like netvibes.com a whole lot.
November 13, 2006
Posted by davidbloom |
Web/Tech |
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in google i put: pserver:guest@cvs.dev.java.net: /cvs dwr
which gave me this url
November 11, 2006
Posted by davidbloom |
Open Source |
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AJAX: It enhances user interaction by targeting updates from the server
to specific areas of the web page, known as "In-page replacement" . DWR is easy AJAX for Java
Introduction where I learned of Jesse James Garrett from web site Adaptivepath.com is the person who is behind the technology.
AJAX w Java
Google Maps mania
AJAXIAN
Relevance has
Demo from Ajax presentation at Java in Action .
Sun Tip on AJAX
AJAX Talk notes
Eclipse AJAX Toolkit Framework project
Paul Graham : "Basically, what "Ajax" means is "Javascript now works." And that in turn means
that web-based applications can now be made to work much more like desktop ones.
Similarly, RMH tunes in about AJAX
Google Maps
Stu Halloway : "predicts Ajax will be part of nearly all web applications within the next year."
Google Web Toolkit (GWT) this API &samples Designer Tool
Software Development in the Real World: The Complete List of Ajax Tools
(tags: ajax)
November 11, 2006
Posted by davidbloom |
AJAX |
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I downloaded webtest to c:/java/webtest and started the install . Note that manual for webtest. I believe it makes use of clover the coverage tool.
webtest -buildfile installTest.xml
installTest.xml:
..
<target name="checkWebTest">
<echo message="webtest.home is ${webtest.home}"/>
<testSpec name="check calling and parsing a local file">
<config
host=""
port="0"
basepath="/"
summary="false"
saveresponse="false"
haltonfailure="true"
protocol="file"/>
<steps>
<invoke
description="get local file"
url="${basedir}/testfile.html"/>
<verifyTitle
description="check the title is parsed correctly"
text="Test File Title"/>
</steps>
</testSpec>
</target>
testfile.html:
<html><head>
<title>Test File Title</title>
</head>
<body>
empty
</body>
</html>
November 10, 2006
Posted by davidbloom |
SW Tools |
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Servlet Filters [ link ] — are not Servlets and they are not responsible for
creating a response.
They are preprocessors of requests before they
reach a Servlet and postprocessors of responses after leaving a
Servlet.
Servlet filters can:
-
Intercept a Servlet’s invocation before the Servlet is called
-
Examine a request before the destination Servlet is invoked
-
Modify request headers and request/response data by subclassing the HttpServletRequest object and wrapping the original request
-
Intercept a Servlet’s invocation after the servlet is called
The designers of Servlet Filters identified the following examples for their use:
Authentication Filters, Logging and Auditing Filters,Image conversion Filters, Data compression Filters, Encryption Filters, Tokenizing Filters, Filters that trigger resource access events, XSL/T filters, Mime-type chain Filter
web.xml:
<filter>
<filter-name>My Filter</filter-name>
<filter-class>com.myproject.MyFilter</filter-class>
<init-param>
<param-name>enable</param-name>
<param-value>yes</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>My Filter</filter-name>
<servlet-name>action</servlet-name>
</filter-mapping>
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
public class MyFilter implements Filter
{
boolean _enable = false;
public void init(FilterConfig fc) throws ServletException
{
String enable=fc.getInitParameter("enable");
if ("yes".equals(enable))
_enable=true
}
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
if (! _enable)
{ // proceed with request
chain.doFilter(request, response);
return;
}
doIt();
chain.doFilter(request, response);
//After
FilterChain.doFilter() returns, the filter can do more processing if it
chooses;
doINextt();
}
public void destroy()
{
}
}
November 5, 2006
Posted by davidbloom |
Web Design |
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"Basic approach is that pages push themselves onto a trail-stack, and
a normalized version is maintained for showing on a page. ie)
In addition to the normalized user version, a full trail is also
maintained, which could be emailed or stored instead of access logs on
session expiry.
Normalization occurs whenever an element is repeated in a trail, its
http-referer is repeated in a trail [ie sneaky users used the back button]
or possibly when the trail:pop tag is used, though I’ve not had a need to
use that yet."
November 4, 2006
Posted by davidbloom |
Web Design |
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Stu Halloway : "predicts Ajax will be part of nearly all web applications within the next year."
Tapestry: "component based framework"
Instantiations
November 4, 2006
Posted by davidbloom |
Web Design |
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After the release of WebWork 2.2.2, the WebWork and Struts communities began a merge that will eventually produce Struts 2. This merger combines these two "action based" frameworks as it is told .
Compared to SpringMVC,
you sacrifice some cleanliness but there is a lot more work done in
certain areas, for example client-side validation, a strong Interceptor
framework and a nice graphical flow
designer – this latter is also a strong area, with WebWork being one of
the pioneer adopters of the freshly unbundled RIFE Continuations package.
Read more »
November 2, 2006
Posted by davidbloom |
Struts |
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