spring oauth2 rest template with client credentials grant sample

UserRestControllerTest.java

import org.junit.Test;
import org.junit.runner.RunWith;
import org.master.Application;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.IntegrationTest;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.security.oauth2.client.DefaultOAuth2ClientContext;
import org.springframework.security.oauth2.client.OAuth2RestTemplate;
import org.springframework.security.oauth2.client.token.grant.client.ClientCredentialsResourceDetails;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;

import java.util.List;
import java.util.Map;

import static java.lang.String.format;
import static java.util.Arrays.asList;

/**
 * Created by XY on 2017/4/10.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
@WebAppConfiguration
@IntegrationTest("server.port:0")
public class UserRestControllerTest {
    @Value("${local.server.port}")
    protected int port;

    @Test
    public void testGetAllUsers() {
        ClientCredentialsResourceDetails resourceDetails = new ClientCredentialsResourceDetails();
        resourceDetails.setAccessTokenUri(format("http://localhost:%d/oauth/token", port));
        resourceDetails.setClientId("client");
        resourceDetails.setClientSecret("secret");
        resourceDetails.setGrantType("client_credentials");
        resourceDetails.setScope(asList("read", "write"));

        DefaultOAuth2ClientContext clientContext = new DefaultOAuth2ClientContext();

        OAuth2RestTemplate restTemplate = new OAuth2RestTemplate(resourceDetails, clientContext);
        restTemplate.setMessageConverters(asList(new MappingJackson2HttpMessageConverter()));
        System.out.println("access token: " + restTemplate.getAccessToken());

        final List<Map> users = restTemplate.getForObject(format("http://localhost:%d/api/users", port), List.class);
        for (Map user : users) {
            System.out.println("username: " + user.get("username"));
        }
    }
}