Develop Reference

Routing with open street maps

i have to develop a routing system with open street maps for my second year project (part of the project). I cannot use any external API's for routing. I understand .osm files and I was able to convert them to postgresql format using osm2po and create a database out of it but after this I am clueless. I have researched alot but cannot find any proper help on this topic. Any advice will be awesome.

If you are just focussing on developping an new algorithm, you might have a look at the Trafficmining framework that does all the parsing etc. for you and you just need to code the nessesary java components for your custom behaviour.

You didn't really tell us where you are stuck. But I suggest starting to read the OSM wiki about routing and tags for routing. Looking at one of the many online routers and offline routers for OSM will get you some ideas, too.

what are the steps to make a word search for a website?

I want to write a word search,which connects to a specific website(huge one),takes the word from user,searches the site and returns the strings which contain the word;this should be written in java and as an applet.I have read some tutorials and questions on this,and understood what have to be done is:
1.connect to a website and get the content of a website and save it to a string.(this should be done with a webcrawler which will be made from my own code for connecting to website and save the content to a string + jsoup library to parse the html code).
2.save the datas to a database(in my case nosql database).
3.index the datas in database.
4.query the database to show the results.
5.make a UI for showing the search results(I use swing.japplet).
now my qustions are:
1.have I understood correctly the steps which I have to go?(please explain me in details if a step is unnecessary or necessary)
2.Is it necessary to have a database?
notice:I want to implement it myself,without using ready things such as lucene,nutch,solr,...
edit:3 people told me applet is not suitable for such a thing,so what should be the replacement?
many many thanks for your help.

You should look at using Lucene, as it does most of what you want here.
You should not use applets.

For small data set, database should be sufficient. Databases like mysql comes with full text search functions.
For bigger data set, you might want to consider Lucene or Solr.

That is one way way to implement this. Another (simpler) way would be to use an existing text search / indexing engine like Lucene / Solr. Going to the effort of reimplementing the "text search / indexing" wheel using database technology strikes me as a waste of effort, unless you have a sound technical reason for doing so.
You do need to has some kind of database, because indexing a website on the fly would simply not work. Lucene will handle that.
I think your choice of Java applets to build the UI is a bad idea. There are other technologies that give results that are as good or better ... without the security risk of a Java browser plugin.
Finally, another way to make your website searchable is to get Google to do it for you. Make your website content indexable, and then use Google's search APIs.

Android app, how to log into website and display information?

I'm trying to build an android app that will log into a website, scrape the website for data specific to the user, then format that data nicely on a mobile screen.
I've noticed that there are several similar questions to my own, and after reading some of the documentation, I am still very confused as to how I should go about this.
Here's what I know
The site that I want to log into utilizes asp.net and the login.aspx uses POST for the login form.
There is no API for this website
There is also no single sign on
I'm very new to Android and a novice JAVA programmer at best. Will someone please help me carve the path of research that I need to do in order to write this app? I feel that I mostly need help with connecting to the website and getting the data, I'll be able to figure out the layouts and formatting myself.
I am more than willing to research and read whatever is necessary, but I would like to minimize any irrelevant information that would ultimately lead to more confusion.
Thank you in advance for the help

For the purpose of accessing the website all you need to know about is HTTP. It doesn't matter whether your target website is built with PHP or ASP etc. As you're only concern is how to communicate with the website through HTTP which is independent of technology used by the website. You can try wikipedia for descriptions of these methods.
It might be worthwhile reading the Java URL tutorials for how to use Java classes. As regards extracting the data itself you might want to read up on Parsers. This link might give you some first ideas.

I'd use the Jsoup
API. I've posted many many threads on that issue. This'll probably help you login. I don't know how android manages SSL certificates. So that you'll have to research on your own. But this right here is a good start.
Jsoup Cookies for HTTPS scraping

Connect Android application to remote data

Sheesh talk about limited information! I'm trying to get my Android application to connect to an online database to access information. There's quite a bit of info including geotags and these are going to be mapped on my app. The developer site has the very informative piece of information:
You can use the network (when it's available) to store and retrieve data on your own web-based services. To do network operations, use classes in the following packages:
java.net.*
android.net.*
Like I said in my previous question, I'm still very much an android newbie, and trying to remember my java oop from college is slow. Does anyone have an example of how this might work, or how I could implement it? I wouldn't mind even connecting to a local xml file, if I could find a good example of how to do that!? Am I just looking in all the wrong places?!
Help. Please!
T

How do you plan to connect to the database?
Android allows you do to plain socket communication which you can refresh your knowledge of here:
http://java.sun.com/developer/onlineTraining/Programming/BasicJava2/socket.html
Another method would be to put up a REST type service and respond with XML. SAX is commonly used for XML parsing in Android:
http://www.saxproject.org/

You can use SAXParser to parse XML from the net. Here's a tutorial on how to use the same.

Generating and visualising a decision tree

I wonder if anyone is able to help or advise with the following; I have to be able to take data from a data source and to be able to visualise that data as a decision trees on a web page all. This will be a single process which is seamless to an end user.
This will be done using JSPs and Java servlets but what concerns me are the underlying products. I'm thinking of passing the data to a Weka classifier and then doing something with the .dot file it creates, i.e. maybe feeding it to GraphViz or trying to use the Google Visualization API to present an interactive display.
But, can anyone tell me if this is a viable approach or suggest alternatives?
Thanks
Martin O'Shea.

I've had a lot of success creating data flow graphs with graphviz (I uploaded them with a script to a MoinMoin wiki and used the graphviz plugin). That plugin even allowed to have links in the graphs, so we could keep the individual graphs small.

For the UI we have added the JS stuff from http://www.mxgraph.com/ to display larger graphs to the user.
Your approach is viable however. GraphViz is a good tool.