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Steps to create Jersey Client for Rest API
1. Dependencies to use Jersey JAX-RS Client support2. Creating and configuring a Client instance
3. Targeting a web resource
4. Identifying resource on WebTarget
5. Invoking an HTTP request
6. Complete Example
7. Conclusion
1. Dependencies to use Jersey JAX-RS Client support
<!-- Required only when you are using JAX-RS Client -->
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>2.27</version>
</dependency>
2. Creating and configuring a Client instance
Client client = ClientBuilder.newClient();
ClientConfig clientConfig = new ClientConfig();
clientConfig.register(MyClientResponseFilter.class);
clientConfig.register(new AnotherClientFilter());
Client client = ClientBuilder.newClient(clientConfig);
3. Targeting a web resource
WebTarget webTarget = client.target("http://example.com/rest");
WebTarget webTarget = client.target("http://example.com/rest");
webTarget.register(FilterForExampleCom.class);
4. Identifying resource on WebTarget
@Path("/users")
public class UserResource {
}
WebTarget resourceWebTarget = webTarget.path("users");
WebTarget helloworldWebTarget = resourceWebTarget.path("helloworld");
WebTarget helloworldWebTargetWithQueryParam =
helloworldWebTarget.queryParam("greeting", "Hi World!");
5. Invoking an HTTP request
Invocation.Builder invocationBuilder =
helloworldWebTargetWithQueryParam.request(MediaType.TEXT_PLAIN_TYPE);
invocationBuilder.header("some-header", "true");
Response response = invocationBuilder.get();
System.out.println(response.getStatus());
System.out.println(response.readEntity(String.class));
Response postResponse =
helloworldWebTarget.request(MediaType.TEXT_PLAIN_TYPE)
.post(Entity.entity("A string entity to be POSTed", MediaType.TEXT_PLAIN));
6. Example summary
ClientConfig clientConfig = new ClientConfig();
clientConfig.register(MyClientResponseFilter.class);
clientConfig.register(new AnotherClientFilter());
Client client = ClientBuilder.newClient(clientConfig);
client.register(ThirdClientFilter.class);
WebTarget webTarget = client.target("http://example.com/rest");
webTarget.register(FilterForExampleCom.class);
WebTarget resourceWebTarget = webTarget.path("resource");
WebTarget helloworldWebTarget = resourceWebTarget.path("helloworld");
WebTarget helloworldWebTargetWithQueryParam =
helloworldWebTarget.queryParam("greeting", "Hi World!");
Invocation.Builder invocationBuilder =
helloworldWebTargetWithQueryParam.request(MediaType.TEXT_PLAIN_TYPE);
invocationBuilder.header("some-header", "true");
Response response = invocationBuilder.get();
System.out.println(response.getStatus());
System.out.println(response.readEntity(String.class));
Client client = ClientBuilder.newClient(new ClientConfig()
.register(MyClientResponseFilter.class)
.register(new AnotherClientFilter()));
String entity = client.target("http://example.com/rest")
.register(FilterForExampleCom.class)
.path("resource/helloworld")
.queryParam("greeting", "Hi World!")
.request(MediaType.TEXT_PLAIN_TYPE)
.header("some-header", "true")
.get(String.class);
String responseEntity = ClientBuilder.newClient()
.target("http://example.com").path("resource/rest")
.request().get(String.class);
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