...
...
| Code Block | ||
|---|---|---|
| ||
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
class Main
{
public static void main(String[] args) {
Client client = Client.create();
WebResource webResource = client
.resource("http://localhost:8080/RESTfulExample/rest/json/metallica/get");
ClientResponse response = webResource.accept("application/json")
.get(ClientResponse.class);
}
} |
Client side load balancing
Usage of org.springframework.cloud.client.loadbalancer.LoadBalancerClient allows to choose a service to call so impacts the URL called.
| Code Block | ||
|---|---|---|
| ||
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.client.RestTemplate;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.client.ServiceInstance;
import java.net.URI;
class Main
{
@Autowired
private LoadBalancerClient loadBalancerClient;
void f()
{
RestTemplate client ;
ServiceInstance serviceInstance = loadBalancerClient.choose("user-auth");
String path = serviceInstance.getUri().toString() + "/oauth/token";
client.put(path, client);
}
} |
Feign
Feign is a declarative web service client which makes writing web service clients easier. Native sample: "RequestLine" annotation indicates the presence of feign web service:
...
| Code Block |
|---|
class MyHttpCall
{
void execute(String url, String method)
{
Client client = ClientBuilder.newClient();
WebTarget myResource = client.target(url);
if (method == "GET")
{
String response = myResource.request(MediaType.TEXT_PLAIN).get(String.class);
}
else if (method == "PUT")
{
myResource.request(MediaType.TEXT_PLAIN).put(null);
}
}
}
|
- @Value on constructor or method parameters are not handled
- For feign and retrofit2.http web services we do not evaluate strings inside annotations
- Manual creation of feign clients is not supported