I am trying to get started with REST web development with java.
I've found a lot of tutorials where people write up sample RESTful web service and clients for them in Jersey. I do understand how they work and I am happy with my progress.
However, there are a couple of things that should be obvious (?) but are not so clear to me. All of the tutorials that I have gone through develop clients whose input and output is all done through the console. Is it possible to develop a client whose input and output is done through a web browser?
I've also had a quick look over JSP, which I understand is used to create dynamic web content. Is it feasible to create a Jersey client that uses JSP to get its input and print its output? I would be very grateful for any examples / sample code that demonstrate how this can be done, if this is something that can be done.
Thanks!
Related
I want to reach the data saved in a mysql server for an Android phone. I thought about to connect directly the phone to the mysql but it is a bad practice because someone can get the user/pass of the DB.
However the REST architecture maybe it's a solution for my problem. I found the toolkit GWT but I don't know if it's the best way to solve my problem and what I need to use the GWT.
And I got 2 questions basically:
The GWT is good for my purpose?
Need a Tomcat server for example to set the GWT code?
One annotation, the data is for an app Android, there is no HTML interface .
Nowadays I'm working at localhost. Thanks for the answers.
As far as I understand, you want to implement a RESTful service (Web API). GWT targets the Web UI to be able to build it using Java and compile it into JavaScript. I think that it's not what you expect.
Here is a link that provides you hints about concepts of REST: https://templth.wordpress.com/2014/12/15/designing-a-web-api/. It will describe you what is a RESTful service and how to design it.
There are several technologies to build RESTful services (server-side frameworks). I can list two of them:
Restlet (see this link http://restlet.com/technical-resources/restlet-framework/tutorials/2.3 and http://restlet.com/products/restlet-framework/)
JAX-RS and its implementations (Restlet, Jersey, EasyRest). See this link for example: https://templth.wordpress.com/2015/03/06/getting-started-with-resteasy/.
Hope it helps you,
Thierry
I am trying to create a RESTful web service that accepts JSON arguments and gives out a JSON response.
What I want is to accept HTTP requests made to my URL endpoint.
Something like,
POST /the/endpoint HTTP/1.1
Host: mywebsite.com
{"name":"yourname", "department":"your_department"}
Do a DB read at the backend and give relevant parameters like, say Manager name, salary etc as a JSON object, as the response.
What's the best way to go about it? I was thinking of using Java servlets for this? Is there a better way?
PS - I am just getting started so detailed answers or links to tutorials as to how to implement it would be much appreciated.
Thanks.
Yes you can easily do this with Servlets and some Json Libs for Marshalling /unmarshalling the Json Object to Java Object.
You can make use of Json libs like
Jackson ,
Gson etc
But you must know that REST application doesnt end with just handling the request and response , but it needs to take care of other non-functional requirements like
Authentication
Authorization
Security etc
Building this from a scratch from a Servlet is overkill and waste of time when there are ready made frameworks that these things for you
My favorite is Spring MVC 3.0
Check their project site for more details
Just to show you how easy to set up one in Spring MVC , check this below tutorial
Spring 3 REST Tutorial
Pls rate the post if it helps , Cheers.
If you want to go with Java, I suggest that you take a look at JAX-RS... And since REST is a complex topic, here is a url with tons of informations on it. http://code.google.com/p/implementing-rest/
As a complete beginner, I believe the best way to implement a (nearly) RESTful API without having to read a lot is simply to implement the API just using HTML pages and HTML forms with the back-end processing to handle them.
The rules are:
Use <a> tags to provide links to related resources. (navigation)
Use <form> tags to initiate any kind of processing operation on the server. (actions)
You can then make it properly RESTful by using progressive enhancement to add Javascript AJAX requests that perform PUT, PATCH, and DELETE instead of using POST for those three (of course, keeping POST for creating resources where the client doesn't know the resultant URI).
You can then click around and test the API in a web browser! Tools like Selenium can automate this.
If you need to provide JSON, this can be added after the API has been designed and tested, although libraries exist to process HTML or XHTML responses too, so JSON isn't necessarily required for machine readability.
if you are using php with symfony try:https://github.com/FriendsOfSymfony/FOSRestBundle this lets you create a real REST full servicer very quick.
Vogella made my day very easy when i started Web services with an super example here with eclipse screen shots ..Have a look here.
Using Google App Engine SDK:
webpage: http://hwsejk.appspot.com/
I'm trying to make a web server using java and jsp (it is a web server for an iPhone application). I don't know a lot about java so I'm having a lot of troubles trying to construct a server by myself. For now, I have tried implementing cookie, database, and some other methods. Now that I've given you basic information about my web server, I have a few questions to ask.
Is it the right approach to use java and jsp to make a web server like this? the java servlets get and send user inputs to different jsp pages, which contain some HTML and java code. But I've found some posts here that it's a bad practice to use jsp like this. I don't know how else I can make webpages. Could anyone please recommend the right approach to make a web server (like the one linked above)? I would love to know if there is some kind of a template that I can take a look at.
What you are making doesnt seem to be a "server" at all but rather a "web application" or "web site". The former implies you are creating a piece of sfotware to implement a specific protocol like HTTP, FTP, etc. while the latter is making a series of web pages or and application that runs on server.
You can create a web application in any number of languages, not just Java. From the screenshot you shared i would think that using Rails (Ruby), Django (Paython), or Symfony2 (PHP) would probably get you up and running pretty fast as it looks like you dont need much more than some basic model scaffolding with a pretty face.
If you are familiar with Java you might also want to try the Play! framework...
I have a web app, that also has an iPhone and Android app using the same API. It hasn't yet been made publicly available, so I wanted to look to convert from SOAP to REST.
I was only able to find a few tutorials that go into thorough explanations of how to code a REST web service, and of those I only found the MSDN one useful. The problem is I got really confused when they started using URI data types inside the object.
My question is, if you are converting SOAP to REST, do you have to recreate all the objects to add the URI? Am I not able to just have a REST entry point, then call one of the classes that retrieve the data?
Once the REST service is made it will only be used by my mobile apps, but not the website (since that can directly access the classes), which makes me not want to change the objects to add a URI. Is that a correct assumption to make, or should the web services also be called by the website?
Sorry if these are newbie questions, but I am struggling to get my head around REST, and I haven't had much experience creating the architecture of potentially high user base apps.
If anyone is able to point me to an actual code set, that would be helpful.
Edit: I am using VS2010, coding in C# and .Net 4.
Thanks a lot,
Andy
Im doing a very similar thing right now :). Rest via wcf isnt too hard, you do have to sometimes add your endpoints in the web config and give it the [webget]/[webinvoce] attributes in the refrence.cs of the web refrence when consuming though c# which is annoying.
Here is a code set i used when getting started. There are a few more on code project too.
i want to read and write data to a website (server on web) and don't have any information about webservices and other things that related to it
Does anybody have any idea about how to start it (mean offer complete books,papers,tutorials,websites,… or what should i learn at first mean is it necessary to learn xml,soap,... and other things)
Thank you
I've used Google App Engine with great success. You would format your data to output as JSON and use an iPhone library to read it. I've used this one (though Touch JSON seems to be more popular).
Read about REST, ROA and AtomPub. Thats got me started. I'm about to implement some webservices in WCF (WCF now acts like a RESTFul webservice, but you can also use plain old SOAP). Before I got to WCF, I experimented with RoR. RoR uses REST "out-of-the-box".