August 14, 2022

RESTful Java client with java.net.URL

In this tutorial, we show you how to create a RESTful Java client with Java build-in HTTP client library. It’s simple to use and good enough to perform basic operations for REST service. The RESTful services from last “Jackson + JAX-RS” article will be reused, and we will use “java.net.URL” and “java.net.HttpURLConnection” to create a simple Java client to send “GET” and “POST” request.

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Jersey and HK2 dependency injection (auto scanning)

This article shows how to use HK2 dependency injection framework in Jersey and enable auto-scanning auto-discovery of the declared @Contract and @Service components. Jersey, by default, uses HK2 (Hundred-Kilobyte Kernel) for dependency injection. And the HK2 is an implementation of JSR-330(Dependency Injection for Java). For Jersey and HK2 development, we only need to declare jersey-hk2.

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JSON example with RESTEasy + Jackson

Many like Jackson JSON processor, and it supported in RESTEasy. In this tutorial, we show you how to convert an object to JSON format and return it back to the client. To integrate Jackson with RESTEasy, you just need to include “resteasy-jackson-provider.jar“. When RESTEasy returned a json output, it will use Jackson provider to convert it automatically. You do not need to code a single line to integrate both.

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