I have written a Java program, which reads numbers from different files. The numbers are added while being read from the files and the sum is displayed in a browser. The browser keeps on displaying the new sum getting created at every step.
I know how to display static values in a browser. I can use Javascripts. But I don't know what mechanism to use to display continuously a changing value.
Any help is appreciated!
You'll have to request the data to display from the server. You can use a data-binding library like Knockout to automatically update the page as the underlying model changes, or you can just use a library like jquery to modify the DOM on your own.
Alternatively, you could keep a pipe open to the server using the Comet model: http://en.wikipedia.org/wiki/Comet_%28programming%29. However, it can be expensive to eat up a thread for long periods of time on your web server.
Good luck.
Check out knockout.js http://www.knockoutjs.com/ it is a framework for updating UI automatically when data changes
Related
Im new to java and working on a simple application that monitor an url and notify me when a table is updated whit new items. Looking at the entire page will not work as there are commercials that change all the time and they would give false positives.
My thought was to fetch the url line by line looking for the elements. For each element I will check to see if the element is already in an arraylist. If not the element is added to the arraylist and a notification is send.
What I need support with is not the exact code but advice if this would be a good approach and if I should store the elements in an array list or if I should use a file instead as there are 2 lines of text in each element.
Also It would be good to get recomandation on what methods and libs there would be good to look at.
Thanks in advance
Sebastian
To check the site it'd probably be more stable to parse the HTML and work with an object representation of the DOM. I've never had to do this but in a question regarding how to do this another user suggested using JTidy, maybe you could have a look at that.
As for storing the information (what you currently do in your ArrayList): this really depends on what you use your application for. If you only want to be notified of changes that occur during the runtime of your program this is perfectly fine. If you want to have the information persist you should find a way to store the information in the file system or database.
If user refresh the page continuously using F5 functional key then the page loading is very slow and can be seen blank page for long time.
How to solve this problem?
I tried using cache on server side but I don't think that I am using it in proper way.
Can somebody help me with an example.
I think you need to use browser cache, which can be controlled by http headers, or meta tags.
http://www.mnot.net/cache_docs/
You need to set page cache to be around 5 seconds or some similar value so that no new request will be sent to server in that time interval.
A few things:
You could try to minimize processing time within your application, maybe by minimizing wasteful operations. Sounds like your application spends a lot of time recreating the output.
You could try to add some sort of caching on the server side, and and send the user the same page (ie no "new" processing) for some time. Depending on the mechanism, this may not be feasible though (https, security?). At least, afaik.
Of course you could change the way the site works. You could use Ajax to push information to the site the user is on, and so take the urge to refresh away from him.
And maybe your server just does not have enough power to serve a lot of users at the same time?
It is very difficult to stop user from pressing F5.
Try making your code more optimized.
Use meta tags for cache like:
cache-control
EXPIRES
PRAGMA NO-CACHE
Also check this for JSP caching.
response.setIntHeader("Refresh",5);
just use this jsp method for autorefreeshing of ur webpage...
http://www.tutorialspoint.com/jsp/jsp_auto_refresh.htm
I have some content displayed using computed fields inside a repeat in my xpage.
I now need to be able to send out a newsletter (by email) every week with the content of this repeat. The content can be both plain text and html
My site is also translated into different languages so I need the code to be able to specify the language and return the content in that language.
I am thinking about creating a scheduled lotusscript or java agent that somehow read the content of the repeat. is this possible? if so, some sample code to get me started would be great
edit: the content is only available to logged in users
thanks
Thomas
Use a java agent, and instead of going to the content natively, do a web page open and open the page as if in a browser, then process the result. (you could make a special version of the web page that hides all extraneous content as well if you wanted)
How is the data for the repeat evaluated? Can it be translated in to a lotusscript database.search?
If so then it would be best to forget about the actual xPage and concentrate on working out how to get the same data via LotusScript and then write your scheduled agent to loop through the document collection and generate the email that way.
Looking to the Xpage would generate a lot of extra work, you need to be authenticated as the user ( if the data in the repeat is different from one user to the next ) to get the exact same data that this particular user would see and then you have to parse the page to extract the data.
If you have a complicated enough newsletter that you want to do an Xpage and not build the html yourself in the agent, what you could do is build a single xpage that changes what's rendered based on a special query string, then in your agent get the html from a URLConnection and pass the html into the body of your email.
You could build the URL based on a view that shows documents with today's date.
I would solve this by giving the user a teaser on what to read and give them a link to the full content.
You should check out Weihang Chens (my colleague) article about rendering an xPage as Mime and sending it as a mail.
http://www.bleedyellow.com/blogs/weihang/entry/render_a_xpages_programmtically_and_send_it_as_a_mail?lang=en_us
We got this working in house and it is very convenient.
He describes 3 different approaches to the problem.
I am working on a project here that ingests internal resumes from people at my company, strips out the skills and relevant content from them and stores it in a database. This was all done using docx4j and Grails. This required the resumes to first be submitted via a template that formatted everything just right so that the ingest tool knew what to look for to strip the data.
The 2nd portion of this, is what if we want to get out a "reduced" resume from the database. In other words, I want to search the uploaded content I now have, and only print out new resumes for people who have Java programming experience lets say. So I can go into my database, find the people who originally had java as a skill, and output a new set of resumes that are also still in a nice templated format, and only have the relevant info in them, instead of ALL the content.
I have been writing some software to do this in Java that will basically use a docx template, overwriting the items in customXML which are bound to the content controls in the doc, so the new data shows up and can eb saved as a new docx with that custom data.
This seems really cumbersome to me, and has some limitations. For one, lets say my template has a place for 3 Skills, and the particular person has 8 skills. There seems to be no good way to add those 5 additional skills to the docx other than painstakingly inserting the data with all of the formatting XML tags and such. This is a real pain, because if the template changes, I dont want to have to go back into my software and edit source code to change that additional data input XML tag to bold instead of italic.
I was doing some reading up on using Infopath to create a form that I could use to get the input, connecting to some sharepoint data source or something to store the stripped out data. However, I can't seem to find out if it is possible using sharepoint to get the data back out, in a nice formatted way. What would the general steps for this be? It seems like I couldnt find very much about this topic with any quick googling.
Thanks
You could set up the skills:
<skills>
<skill>..</skill>
<skill>..</skill>
and use a "repeat" content control pointing to the container. This would handle any number of <skill> entries.
I have a small application in java which searches images using bing image search. The problem I am facing is that, its getting only first 20 images. May be because when we search on bing.com it populates first 20 images first and then its an infinite scrolling feature.
Is there any way to search more than 20 images using bing?
Cheers :)
I'm guessing this is because this site uses ajax to populate the "infinite" scrolling list as you call it.
You probably send an http request and get the initial page (btw on my browser I got 6 images accross x 4 down, i.e. 24 not 20; thinking about it maybe my client also got 20 only at first and got the last 4 w/ ajax...), and you'd need to do the paging trough by way of ajax requests.
At a glance, the xhtml and associated javascript of the page is very dense and somewhat obfuscated, It would take a while to get oriented... An alternative to analyzing this page is to instead use a packet sniffer (such as wireshark) and to capture the requests which take place when you scroll down.
Essentially this will likely expose some form of ajax request, which you can then easily emulate with java. Typically the ajax response is easy to parse whatever its nature (xml, jason, gzip...).
A possible snags to this well laid out plan is if the returned data in the ajax response is encrypted, for example where the extra images are bundled in some sort of envelope for which you'll then need to discover the format.
Depending on the actual task at hand, you may try alternatives such as automations within GreaseMonkey (on Firefox) or similar tools.
What of Bing API ?
Note that all the above approaches are akin to screen-scraping and hence quite sensitive to even minute changes in the Bing application, and, depending on effective usage and context, this could put the project in a legal grey area... A better approach may be to register and obtain a proper application ID with MS/Bing and to use the Bing API.
You are simulating a browser? Doesn't the Bing engine have an entry point for programs instead - a web service or so - which would make your task much easier.
EDIT: SDK appears to be here: http://msdn.microsoft.com/en-us/library/cc980922.aspx
Just wanted to post a direct answer to the question:
Bing uses Ajax (of course) for the infinite scroll. Each "tick" is based on a simple ajax get request, which accuires new images.
For instance, this url returns 30 results (121-151) in a "htmlraw" format based on the query "max payne".
http://www.bing.com/images/async?q=max+payne&format=htmlraw&first=121
Edit:
It works with the original url too, just add &first=NUMBER to the querystring. Example:
www.bing.com/images/search?q=payne&go=&form=QBLH&scope=images&filt=all&first=10
I am building my own bulk image collector (for a "learning project" for myself) and I found out that it is paginated like this.
FYI, Google and Bing are easy, Yahoo and Altavista (redundant, since their results are from Yahoo) are far more problematic - they don't post the directlink to the original image.
Have fun! :)
This can be done by using count parameter. For example, I tried GET "https://api.cognitive.microsoft.com/bing/v7.0/images/search?q=shoes&mkt=en-us&count=30" call and it returns 30 images.