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#Jxl api example java how to
#Jxl api example java android
#Jxl api example java code

You can use the other HTTP methods (like PUT or DELETE) to interact with the data as well. For example, you’d view Ada’s data by issuing a GET request to /people/Ada, and you’d modify Ada’s data by issuing a POST request to /people/Ada.

You use HTTP methods to access or change data.

For example, /users/Ada lets you access data about a person named Ada. It’s more a way of using the concepts we’ve already learned. REST doesn’t actually involve any new technical concepts. REST stands for representational state transfer, which is just a fancy name for a set of rules that you can follow to build a web app that provides access to data in a way that’s reusable by multiple applications, or many users of the same application. And instead of using HTML forms to create a POST request, it takes POST requests from other applications! (Of course, one of those applications could be another web app that gets user input using HTML forms!) REST The only difference is that instead of showing a website for a GET request, it provides data. To put it another way: a REST API is just a web app, very similar to all of the web apps we’ve already built. Then other applications would call your REST API, which lets you centralize all of your core logic in one place instead of rewriting it every time you wanted to create a new application. It would use SQL and JDBC to interact with the database, exactly like we’ve already learned about. This high-level diagram shows how you might organize your code: you’d have a database (or multiple databases), and your REST API would sit on top of that. Then other programs use your REST API to interact with your data.

#Jxl api example java code

Your REST API is server code whose job it is to provide access to your data and to enforce rules like who can see what. This tutorial introduces the idea of creating a REST API, which is a way of organizing our code so we can access our data from multiple applications.

#Jxl api example java android

But what if we want to support different kinds of programs instead of just a web app? What if we want to create a desktop application or an Android app? How do we provide access to our data for those programs without writing everything from scratch each time?

#Jxl api example java how to

We know how to get user input, how to access a database, and how to handle user logins. Now we know how to create a web app using servlet classes. As mentioned, these examples are heavily based on the Apache HttpClient samples, and I recommend looking at that code for more examples.Creating a REST API Creating a REST API tutorial java server rest ajax json I hope these examples of creating Java REST (RESTful) clients using the Apache HttpClient have been helpful. Java REST clients using the Apache HttpClient library Header headers = httpResponse.getAllHeaders() įor (int i = 0 i < headers.length i++) HttpEntity entity = httpResponse.getEntity() HttpResponse httpResponse = httpclient.execute(target, getRequest) HttpGet getRequest = new HttpGet("/forecastrss?p=80020&u=f") HttpHost target = new HttpHost("", 80, "http")

* Try this Twitter API URL for another example (it returns JSON results):ĭefaultHttpClient httpclient = new DefaultHttpClient() * This executes a call against the Yahoo Weather API service, which is * A simple Java REST GET example using the Apache HTTP library. Here's the source code for this first example class.

Hopefully you can try this against different URLs where you can examine the header information in more detail. I wish I could have provided this demo with the OpenSSO demos I wrote a few years ago (see my PHP OpenSSO REST API examples), because the OpenSSO REST API made extensive use of header information. It also shows how to get all of the headers from the web service you're calling. This REST client uses the following Apache HttpClient classes: That service actually returns information in an RSS format, but if you don't mind parsing that XML, it's an easy way to get weather updates. This first example shows a combination of these Apache HttpClient classes used to get information from the Yahoo Weather API. But hopefully these examples will make other POST or other RESTful examples easier to read. The REST client examples I share here are based on the examples on the HttpClient website I've mostly just tried to make them a little easier to read, and add some additional documentation to them.Īlso, I'm just focusing on HTTP GET requests in this article, because I'm writing real-world code to hit the Twitter REST API, and all I need right now are GET requests. In this article I share some source code for some simple Java REST clients that use the Apache HttpClient project. I started writing some Java REST (RESTful) clients lately, and in doing so, I've been looking at several different ways to do this, including using the Apache HttpClient project, the Jersey project, Apache CXF, and more.