I'm not sure how to start on this, but I currently have a simple application that has a home page url of
localhost:8080/projectName/homePage.jsp
However, I'd like it so that
localhost:8080/projectName/
OR
localhost:8080/projectName
sends me to the homePage.jsp.
I've read about an index.jsp that was created by eclipse in other projects, but it seems like that hasn't been done for me - do I need to create this? I'm not using a web.xml, and am instead relying on #WebServlet to do wiring.
2 ways to do this.
1. Add an entry in web.xml as follows
<welcome-file-list>
<welcome-file>homepage.jsp</welcome-file>
</welcome-file-list>
2. create an index.jsp file in your WebContent folder and forward the request to homePage.jsp
According to the following post there is no such way possible with annotation:
Servlet 3.0 annotations <welcome-file>
So I have files such as index.jsp and download.jsp in my web application widget.war and am using Tomcat 7. I would like these files to be accessible from the internet as html files i.e
http:/www.mycompany.com/widget/index.html
http:/www.mycompany.com/widget/download.html
Questions:
How do I do this, I know it can be done as I did it about 5 years ago but cannot remember how.
Is it a good idea, it seems like a good idea as users are familar with html but jsps, and returning as jsps shows an implementation detail, but does it matter ?
You can map *.html through your application's web.xml to the jsp servlet defined in tomcat_path/conf/web.xml.
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
However, extensions in general are an implementation detail, so it makes no big difference to your users if the URL ends with .html or .jsp. Most won't probably care anyway.
This may be a silly question but I've found no answer when googling this.
Currently, I map the requests from someFileName.html to a servlet which then forwards to someFileName.jsp using servlet mappings in web.xml. I would like to avoid that and just configure my application server so that html files are parsed and executed as if they were JSPs (so that custom tags and EL could be used from within the HTML). Bonus to answers that allow any extensions to be mapped to the JSP processor.
I use Tomcat but I'd like the solution to be portable to other containers such as Glassfish.
With 2 simple steps you can achieve this:
Add this servletmapping for the JSP servlet:
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
This tells the application container to use the the JSP servlet when serving html files.
Comment out the <mime-mapping> for text/html mime type (*.html) files so that the container won't handle HTML files as static content.
Hope this helps.
I am developing a java project.
I want to display an extention of any webpage as '.jsf' evenif it is 'jsp' or 'xhtml'.
What should I do?
Then just configure the FacesServlet accordingly?
<servlet-mapping>
<servlet-name>facesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
If you actually meant "I want to block direct access to *.jsp and *.xhtml so that the visitor is forced to invoke them by *.jsf", then add a security constraint to web.xml on the desired url-patterns and an empty auth-constraint:
<security-constraint>
<display-name>Restrict direct access to JSP and XHTML files</display-name>
<web-resource-collection>
<web-resource-name>JSP and XHTML files</web-resource-name>
<url-pattern>*.jsp</url-pattern>
<url-pattern>*.xhtml</url-pattern>
</web-resource-collection>
<auth-constraint />
</security-constraint>
Redirect all request to to the servlet that needs to handle the jsf requests
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>*</url-pattern>
</servlet-mapping>
STEPS (For new jsp project) :
In web.xml, change to *.jsf
Change to index.jsp
Create new welcome.jsp
In index.jsp page, include :
Run project and see extention in browser.
If this is for using JavaServer Faces, then the configuration of the JSF servlet enables the automatic mapping of .jsf to the underlying .xhtml or .jsp file.
I think you have it the wrong way round.
The user-agent will make requests to your servlet, with a given URI identifying the resource they wish to access. You decide what the correct URI for a given resource is, and how to respond to this request. So it's conceptually not a case of your webpage having an "address" that you want to display differently. Rather, it's a case of what URIs you want to use to map to which resources.
If you don't want to expose the extension, then you don't need URIs to have any extension at all, they're just strings. You will, however, need to think about how to resolve potential name clashes (as djna notes in the comment). I believe that this is configured for you at the Faces level, and actually BalusC's answer should have all the technical information necessary to do this.
I just wanted to point out the backwards nature of your thought processes, clearing this up will hopefully make it easier to grok the process in general. It's better that you understand it, than simply paste something into your web.xml that makes the problem go away (for now).
You should configure your server to process .jsf files as .jsp pages. How to actually do this depends on the server you are using - an information you haven't provided.
Disclaimer: I'm not familiar with either jsf or jsp, so I don't know what consequences this server modification will have on actual jsf pages.
I've mapped the Spring MVC dispatcher as a global front controller servlet on /*.
<servlet>
<servlet-name>home</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>home</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
However, this mapping stops the access to static files like CSS, JS, images etc which are all in the /res/ folder.
How can I access them anyway?
Map the controller servlet on a more specific url-pattern like /pages/*, put the static content in a specific folder like /static and create a Filter listening on /* which transparently continues the chain for any static content and dispatches requests to the controller servlet for other content.
In a nutshell:
<filter>
<filter-name>filter</filter-name>
<filter-class>com.example.Filter</filter-class>
</filter>
<filter-mapping>
<filter-name>filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>controller</servlet-name>
<servlet-class>com.example.Controller</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>controller</servlet-name>
<url-pattern>/pages/*</url-pattern>
</servlet-mapping>
with the following in filter's doFilter():
HttpServletRequest req = (HttpServletRequest) request;
String path = req.getRequestURI().substring(req.getContextPath().length());
if (path.startsWith("/static")) {
chain.doFilter(request, response); // Goes to default servlet.
} else {
request.getRequestDispatcher("/pages" + path).forward(request, response);
}
No, this does not end up with /pages in browser address bar. It's fully transparent. You can if necessary make "/static" and/or "/pages" an init-param of the filter.
With Spring 3.0.4.RELEASE and higher you can use
<mvc:resources mapping="/resources/**" location="/public-resources/"/>
As seen in Spring Reference.
What you do is add a welcome file in your web.xml
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
And then add this to your servlet mappings so that when someone goes to the root of your application, they get sent to index.html internally and then the mapping will internally send them to the servlet you map it to
<servlet-mapping>
<servlet-name>MainActions</servlet-name>
<url-pattern>/main</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>MainActions</servlet-name>
<url-pattern>/index.html</url-pattern>
</servlet-mapping>
End result: You visit /Application, but you are presented with /Application/MainActions servlet without disrupting any other root requests.
Get it? So your app still sits at a sub url, but automatically gets presented when the user goes to the root of your site. This allows you to have the /images/bob.img still go to the regular place, but '/' is your app.
If you use Tomcat, you can map resources to the default servlet:
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/static/*</url-pattern>
</servlet-mapping>
and access your resources with url http://{context path}/static/res/...
Also works with Jetty, not sure about other servlet containers.
Serving static content with appropriate suffix in multiple servlet-mapping definitions solved the security issue which is mentioned in one of the comments in one of the answers posted. Quoted below:
This was a security hole in Tomcat (WEB-INF and META-INF contents are accessible this way) and it has been fixed in 7.0.4 (and will be ported to 5.x and 6.x as well). – BalusC Nov 2 '10 at 22:44
which helped me a lot.
And here is how I solved it:
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
I've run into this also and never found a great solution. I ended up mapping my servlet one level higher in the URL hierarchy:
<servlet-mapping>
<servlet-name>home</servlet-name>
<url-pattern>/app/*</url-pattern>
</servlet-mapping>
And now everything at the base context (and in your /res directory) can be served up by your container.
As of 3.0.4 you should be able to use mvc:resources in combination with mvc:default-servlet-handler as described in the spring documentation to achieve this.
http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-static-resources
The reason for the collision seems to be because, by default, the context root, "/", is to be handled by org.apache.catalina.servlets.DefaultServlet. This servlet is intended to handle requests for static resources.
If you decide to bump it out of the way with your own servlet, with the intent of handling dynamic requests, that top-level servlet must also carry out any tasks accomplished by catalina's original "DefaultServlet" handler.
If you read through the tomcat docs, they make mention that True Apache (httpd) is better than Apache Tomcat for handling static content, since it is purpose built to do just that. My guess is because Tomcat by default uses org.apache.catalina.servlets.DefaultServlet to handle static requests. Since it's all wrapped up in a JVM, and Tomcat is intended to as a Servlet/JSP container, they probably didn't write that class as a super-optimized static content handler. It's there. It gets the job done. Good enough.
But that's the thing that handles static content and it lives at "/". So if you put anything else there, and that thing doesn't handle static requests, WHOOPS, there goes your static resources.
I've been searching high and low for the same answer and the answer I'm getting everywhere is "if you don't want it to do that, don't do that".
So long story short, your configuration is displacing the default static resource handler with something that isn't a static resource handler at all. You'll need to try a different configuration to get the results you're looking for (as will I).
'Static' files in App Engine aren't directly accessible by your app. You either need to upload them twice, or serve the static files yourself, rather than using a static handler.
The best way to handle this is using some kind of URL re-writing. In this way, you can have clean restful URLs, and NOT with any extensions i.e abc.com/welcom/register as opposed to abc.com/welcome/resister.html
I use Tuckey URL which is pretty cool.
It's got instructions on how to set up your web app.I have set it up with my Spring MVC web app. Of course, everything was fine until I wanted to use annotations for Spring 3 validations like #Email or #Null for domain objects.
When I add the Spring mvc directives:
< mvc:annotation-driven />
< mvc:default-servlet-handler />
.. it breaks the good ol Tuckey code. Apparently, < mvc:default-servlet-handler /> replaces Tuckey, which I'm still trying to solve.
I'd recommend trying to use a Filter instead of a default servlet whenever possible.
Other two possibilities:
Write a FileServlet yourself. You'll find plenty examples, it should just open the file by URL and write its contents into output stream. Then, use it to serve static file request.
Instantiate a FileServlet class used by Google App Engine and call service(request, response) on that FileServlet when you need to serve the static file at a given URL.
You can map /res/* to YourFileServlet or whatever to exclude it from DispatcherServlets' handling, or call it directly from DispatcherServlet.
And, I have to ask, what does Spring documentation say about this collision? I've never used it.
Add the folders which you don't want to trigger servlet processing to the <static-files> section of your appengine-web.xml file.
I just did this and looks like things are starting to work ok. Here's my structure:
/
/pages/<.jsp files>
/css
I added "/pages/**" and "/css/**" to the <static-files> section and I can now forward to a .jsp file from inside a servlet doGet without causing an infinite loop.
After trying the filter approach without success (it did for some reason not enter the doFilter() function) I changed my setup a bit and found a very simple solution for the root serving problem:
Instead of serving " / * "
in my main Servlet, I now only listen to dedicated language prefixes
"EN", "EN/ *", "DE", "DE/ *"
Static content gets served by the default Servlet and the empty root requests go to the index.jsp which calls up my main Servlet with the default language:
< jsp:include page="/EN/" />
(no other content on the index page.)
I found that using
<mvc:default-servlet-handler />
in the spring MVC servlet bean definition file works for me. It passes any request that isn't handled by a registered MVC controller on to the container's original default handler, which should serve it as static content. Just make sure you have no controller registered that handles everything, and it should work just fine. Not sure why #logixplayer suggests URL rewriting; you can achieve the effect he's looking for just adequately using Spring MVC alone.
I found a simpler solution with a dummy index file.
Create a Servlet (or use the one you wanted to respond to "/") which maps to "/index.html"
(Solutions mentioned here use the mapping via XML, I used the 3.0 version with annotation #WebServlet)
Then create a static (empty) file at the root of the static content named "index.html"
I was using Jetty, and what happened was that the server recognized the file instead of listing the directory but when asked for the resource, my Servlet took control instead. All other static content remained unaffected.
In Embedded Jetty I managed to achieve something similar by adding a mapping for the "css" directory in web.xml. Explicitly telling it to use DefaultServlet:
<servlet>
<servlet-name>DefaultServlet</servlet-name>
<servlet-class>org.eclipse.jetty.servlet.DefaultServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DefaultServlet</servlet-name>
<url-pattern>/css/*</url-pattern>
</servlet-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<mvc:default-servlet-handler/>
</beans>
and if you want to use annotation based configuration use below code
#Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
With regard to Tomcat, a lot depends on the particular version. There was a bug fix
https://bz.apache.org/bugzilla/show_bug.cgi?id=50026
which means the servlet-mapping (other than for '/') for the default servlet behaves differently in Tomcat 6.0.29 (and earlier) compared with later versions.
In section "12.2 Specification of Mappings" of the Servlet Specification, it says:
A string containing only the ’/’ character indicates the "default" servlet of the
application.
So in theory, you could make your Servlet mapped to /* do:
getServletContext().getNamedDispatcher("/").forward(req,res);
... if you didn't want to handle it yourself.
However, in practice, it doesn't work.
In both Tomcat and Jetty, the call to getServletContext().getNamedDispatcher('/') returns null if there is a servlet mapped to '/*'