![]() With this training, you also learn how to secure web services using both Java-specific and language-independent security technologies, and how the Java APIs - JAX-WS and JAX-RS - deliver a set of powerful tools for developing a Service-Oriented Architecture (SOA). This SOAP and REST Web Services training course provides experienced Java programmers with the skills to write new SOAP and REST web services, and access existing services. */ public class DataStore else if ( "set". * Pretend this class accesses a database. * Example DataStore class that provides access to user data. First off, let’s say we have a class that provides access to our data: ![]() Let’s use all of these ideas to create a REST API. So when we say we’re creating a REST API, we just mean that we’re using REST ideas to create something that programmers can use to interact with our data. The point is that an API is a collection of things we can do when writing code. Similarly, the Java API is the list of classes and functions we use to write Java code. For example, Processing’s reference is an API: it’s the classes and functions we used to write Processing code. Do what makes sense to you and what works for your context.ĪPI stands for application programmer interface, which is a fancy name for whatever a programmer uses to interact with a language or library. You should treat REST as a tool, not as a strict set of rules that you must follow at all costs. The REST police aren’t going to come kick your door down if your code “violates” one of these rules. In other words, you should not store session information on the server! Everything needed to fulfill a request must be included in the request itself!Īll of these “rules” exist for a reason, but it’s important to keep in mind that in the end, everything is up to you. Or it could take a binary string, or XML, or a list of properties. The POST request might then take a JSON string. For example that GET request might return a JSON string that represents the user data. You can represent data however you want.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. 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. 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? 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. Creating a REST API Creating a REST API tutorial java server rest ajax json ![]()
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