I personally do not have much experience working in jsp and struts2 tomcat server but I have a small task that I have to deal with a server in production. I looked at info on the internet for two nights but seems like i can't get the answer.
What I want to do is to open some static simple html pages pop-up from the jsp pages that already exist. Those jsp pages are currently located at /webapps/WEB-INF/tld/mainPage/indexMainPage.jsp
what I did was:
make some javascript functions so that when they click a button, i open a pop-up
function btn_openPopUp()
{
window.open("../popUp/test.html");
}
and put the test.html page at /webapps/WEB-INF/tld/popUp/test.html
The pop-up part works fine as it is just simplye javascript, but test.html is not displayed.
Struts Problem Report
Struts has detected an unhandled exception:
Messages:
There is no Action mapped for namespace / and action name test.
I have been looking at info online, and everything about struts is action based. Is there anyway I can open a page like on a regular server?
Pages under WEB-INF are not directly accessible to clients; put such pages under the root somewhere.
They can still be in sub-directories if it makes sense, just not under WEB-INF. If they must be under WEB-INF for some reason (which makes no sense for non-JSP pages) they can be streamed through an action like any other file--bit that'd be weird for HTML pages.
Related
Am developing a application in which html content of the pages are able to change dynamically. From my application itself user can able to change their html pages using drag and drop form(which is used to design pages).
Once the page is edited and saved successfully, I need to restart the server to reflect the changes in browser which is hurting lot.
I want to build this solution without restart the server.
What I found:
Number 1: I try to have my html pages in DB or file and in run time, i will read from that and render in browser.
Problems:
1: performance
2: HTML code is working fine in out.print() But JSP code are showing as code itself in browser.
Is there any other solution available for to fix this or any existing framework available?
I am attempting to learn Java EE. After struggling through trying to understand the Java stack, it appears that that a basic dynamic web application can be accomplished by focusing on JSP and Servlets so I want to start there.
In Net Beans I have a basic project set up with a tomcat server and when I hit run I can get the web page to generate and display the default index.jsp page. I have added a css file to the project and this jsp page looks like any standard html page now. I then create a new servlet. I was also able to create a link in the index.jsp page so when I click on it, it calls the servlet.
What I don't understand is why when I create the servlet in Net Beans, the processRequest method comes pre-populated with several html print statements. I could easily make this page look like the jsp page I started with, making me wonder why I even need a JSP page. It appears the entire application could be comprised of servlets.
Could someone please explain the proper interaction between the two? It appears the index page can contain links that call various servlets, perhaps to access a database of comments, then do I create the response table in the servlet, or would I pass that information to another JSP page?
Understanding these basic workflows would really help. Thanks
JSP also a kind of a servlet . Right after you run the jsp , go to your netbeans project directory and right click the jsp and select view Servlet then you get the servlet representation of your jsp file. Actually jsp file is there to perform front end design easily. Without jsp It is really difficult task to perform front-end developing stuff inside servlet.
And you should keep in mind there is no such a thing called proccessRequest in javaEE . It is automatically generated by Netbeans once you create a new servlet. So just stick to basics. Erase all the auto-generated stuff from the class which has extended HttpServlet. And then you can override the required HTTP method/methods. (doGet , doPost etc..) You should take a look at this for more infromation ...
And this page will also improve your knowledge on javaEE
I am a beginner in java and web app development. Suppose to analyze & optimize JSP pages, those are taking some while to get data from server.
My question is, can we load the supporting file while the jsp is Waiting for server response?
I think you misunderstand how HTML, JS and CSS work.
In short: the browser sends a request for a certain JSP page. This page return from the server and holds within it a number of link tags referring to the CSS and JS for the file. The browser parses this page and sees that it needs extra resources in order to properly use the page. So it sends another request to the server for the CSS and JS.
Because of this, it is impossible for the browser to know in advance what CSS and JS the JSP page would need, because these are determined by the contents of the page itself.
However, that does not mean that you are out of luck. the first page will always need to load it afterwards, but it is possible to load the CSS and JS for the other pages in advance through the explanations on Pre-loading external files (CSS, JavaScript) for other pages. I have not tried these methods myself, but they seem valid.
Well, if I understand you correctly, why don't you just load the CSS/JS files and fire your other function when that's done? I'm not quite sure why you'd want that, though.
Q1: Does Spring or any opensource java UI framework support partial views like that in asp.net mvc?
For example in my main index.html (or _layout.cshtm per asp.net mvc3 spec)
I would have the folllowing code:
<span id="logindisplay">#Html.Partial("_LogOnPartial")</span>
where #Html is a helper to display a partial view for _LogonPartial.cshtml which just injected it's html view contents into the page?
Q2: If this is supposed If I want to display a bunch of partial views it would be helpful to display them concurrently in parallel to improve performance. Very similar to what linkedin is doing using dust and fizzy? http://engineering.linkedin.com/profile/engineering-new-linkedin-profile
Q3: Is fizzy available as open source like that of dust?
If you want to include content of a page into another page, by adding some code on the page itself, you should compare asp with jsp, not ASP.NET MVC* with JEE - Spring MVC
So, an equivalent to <span id="logindisplay">#Html.Partial("_LogOnPartial")</span> on a jsp would be one / all of the following
On your jsp, include content from another jsp using <%# include file="../includes/inner-content.jsp" %>. This is what is called a static include. The source of the included jsp is included and made part of the parent jsp, before the jsp is compiled. If you use an IDE, it will check to ensure the included jsp does infact exist at the path specified, relative to the location of the jsp in which you are adding the include. Technically this is a JSP Directive. The jsp being included could just be a fragment, and not addressable from the outside world (could be hidden inside WEB-INF)
You can also use what's called a Dynamic include <jsp:include page="someJSP.jsp" />. In this case, the included JSP should be addressable from the browser and should be capable of being rendered independently. When the server is executing the servlet to render the parent JSP, it stops when this tag is seen, and starts executing the servlet for the included jsp, the output obtained from the inner jsp execution is then merged to the output of the parent jsp, and processing of the parent jsp is resumed.
A third option would be to use Core JSTL taglib's <c:import url=""/>. This works just like option 2 above, except it also allows you to import a page / content from a url that lives outside your application. Basically you can mention a path to a jsp, or relative URI to a servlet mapping in your application, or a URL to an external page.
Now, I suspect this is not really what you want to do, if you are comparing with what Linkedin is doing. You want to mashup content from sources in your own application, and compose your page. You also want to do this in an asynch manner so as to keep load times in check. In this case, you HAVE to use JavaScript and Ajax. All the mechanisms described above are for server rendered pages (All HTML is created before the page is rendered in the browser). Just like #HTML. You need to create a simple framework / use an existing one, where once a page loads, it fires asynch ajax calls to the server to get content for specific areas on the page and renders the returned HTML in those specific areas.
Hope this helps.
Do let me know if I've misunderstood your question.
I have a question about Java servlets convention. In looking at any tutorial for servlets, whether it be Eclipse, NetBeans, etc., they always have you create an index.jsp page. Once the page is created, they have you create a form with a "submit" button that jumps you to the servlet for processing. My question is, in a servlets project, do you have to use the main index.jsp page, or can your project go immediately to the servlet?
I am working on my own little project to learn servlets, a project that connects to my local MySQL database, displays the list of schemas you can choose from, then displays the table data for each schema on the next page. In order to dynamically grab a list of schemas on the main page, I will need a servlet, not an index.jsp page. I know this can be done with JSP or JSF, but I would like to use servlets only.
This is where my original question comes in. Can my project go to an initial main servlet instead of an index.jsp page, or does convention, or technical matters, prohibit this?
Thank you for taking the time to read. Have a good day.
Not exactly needed.you can direclty call a servlet.There is no harm in that.
like
<welcome-file-list>
<welcome-file>/index</welcome-file>
</welcome-file-list>