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How would you consume a RESTful API using Java with probably just the standard packages? For ex: Twitter API. I know there are great Java libraries to access it, but how would you start from scratch?
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Apache Http Client APIs are very commonly used for calling HTTP Rest services.
A REST Service in Java EE can be created using JAX-RS. The contents of such service can be consumed using ordinary HTTP requests to a URL. URLs are typically kept simple and have a logical pattern, so it's easy to type them manually in e.g. a browser.
In HTTP there are five methods that are commonly used in a REST-based Architecture i.e., POST, GET, PUT, PATCH, and DELETE. These correspond to create, read, update, and delete (or CRUD) operations respectively. There are other methods which are less frequently used like OPTIONS and HEAD.
Well, there are many ways you could access RESTful API using Java third party libraries, like using Apache Http Client or using Sun Jersey API.
You could also use the native java.net.HttpURLConnection to consume REST Services
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