simple-rest-client

A simple fluent API to write calls to a REST API service without relying on additional libraries. It doesn't need or use Jax-RS client as it's using Java's built-in HttpUrlConnection.

It's intended purpose is to write simple one-line requests for testing, i.e. for preparing a service via Rest API for a test or reading the state after a test.

Examples:

Making a GET request

String resultJson = SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                                    .acceptJson() //accept header
                                    .get()
                                    .asString();

Making a POST request

The following snipped uses javax.json JsonWriter to serialize a JSON object onto the OutputStream.

 String result = SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                                      .acceptJson() //accept header
                                      .sendJson() //conent type header
                                      .post(os -> {
                                         try (JsonWriter w = Json.createWriter(os)) {
                                            w.writeObject(jsonObject);
                                         }
                                      })
                                      .asString();

Sending or Accepting other content types

 SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                 .accept("text/html")

 SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                 .contentType("text/html")

Custom Headers

 SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                 .addHeader("ContentLength", "20")

Authentication

Authentication in general (if you have your auth token)

String resultJson = SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                                    .auth("Basic QWxhZGRpbjpPcGVuU2VzYW1l")
                                    .acceptJson()
                                    .get()
                                    .asString();

Basic Authentication

String resultJson = SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                                    .basicAuth("username","password")
                                    .acceptJson()
                                    .get()
                                    .asString();

JsonObjects or JsonArrays

(using javax.json)

Add the following dependency to your pom

<dependency>
    <groupId>javax.json</groupId>
    <artifactId>javax.json-api</artifactId>
    <version>1.0</version>
</dependency>

Now read the inputstream from the response

JsonObject json = Json.createReader(SimpleRestClient.requestTo("http://my.domain.com/rest/api/resource")
                                                  .acceptJson()
                                                  .get()
                                                  .asInputStream())
                                                  .readObject();