Voila! You could assign the expected type of response and work with it right away. ( httpResponse.getHeaders().get("Content-Type")) Let’s look at the same example with Unirest: HttpResponse httpResponse = Unirest.get(“/?param1=value1¶m2=value2”) Looks pretty difficult, right? Especially InputStream as a type of returned value (it should be further processed). InputStream is = connection.getInputStream() Here you can look at the example of code that makes a request by standard modules: URLConnection connection = new URL(“/?param1=value1¶m2=value2”).openConnection() ĬtRequestProperty("header1", header1) ĬtRequestProperty("header2", header2) Other than that, we will only need the Unirest library for making requests with no problems and in a few lines. Now that we have all the information about Java RESTful APIs, Let’s try it out! Prerequisitesįirst, you’ll need to have Java installed on your machine.Īlso, you should have a Maven package builder for easy installing and using site-packages. Uniform interface – each endpoint has to be with a unique address.It is useful because layers don’t know anything about each other and server could easily be scaled with new layers (e.g., security). Layered system – the server should include layers for different parts of the process.It increases productivity, as far as the number of requests will be smaller. Cacheability – instead of the server, the client could (and even should) save some data on the local storage (cache).The server doesn’t save any information from the client and requires it in each request. For example, if you would send the question “What Charlie’s surname?”, and then follow up with “How old is he?”, the server wouldn’t be able to answer the latter. Statelessness – independence of each singular request from all previous and future requests.The main reason for this constraint – one side doesn’t care about anything except the correct format of the interaction (it’s not your problem how the server performs your request and vice versa). The client sends requests and waits for the answer the server then takes the opposite role. Client-server architecture – clear separation on two sides.So when we say REST API, we mean – APIs that not only returns requested data but also prepares it for further work.īut how can we create a RESTful API? All that is required – a bunch of the architectural constraints: This is the style of software communication that helps a client to get the required data in the well-state for representation ( REST – representational state transfer). Okay, we have got the meaning of the first and the last word in “Java REST API”.
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