Develop with Rest Template

Concept Description

　　Rest Template is a RESTful API provide by the Spring framework. ServiceComb provides the API for service calling

Scenario

　　You can call microservices using your customized URL and the RestTemplate instance provided by ServiceComb regardless of the specific address of the service.

Sample Code

　　Obtain RestTemplate by calling RestTemplateBuilder.create(). Then, use the instance and the customized URL to call microservices. The code is as follows:

import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

import org.apache.servicecomb.foundation.common.utils.BeanUtils;
import org.apache.servicecomb.foundation.common.utils.Log4jUtils;
import org.apache.servicecomb.provider.springmvc.reference.RestTemplateBuilder;
import org.apache.servicecomb.samples.common.schema.models.Person;

@Component
public class SpringmvcConsumerMain {
    private static RestTemplate restTemplate = RestTemplateBuilder.create();

    public static void main(String[] args) throws Exception {
        init();
        Person person = new Person();
        person.setName("ServiceComb/Java Chassis");
        String sayHiResult = restTemplate
                .postForObject("cse://springmvc/springmvchello/sayhi?name=Java Chassis", null, String.class);
        String sayHelloResult = restTemplate
                .postForObject("cse://springmvc/springmvchello/sayhello", person, String.class);
        System.out.println("RestTemplate consumer sayhi services: " + sayHiResult);
        System.out.println("RestTemplate consumer sayhello services: " + sayHelloResult);
    }

    public static void init() throws Exception {
        Log4jUtils.init();
        BeanUtils.init();
    }
}

NOTE:

• The URL must be in format of ServiceComb: cse://microserviceName/path?querystring. Use the provider defined in Develop Microservice with SpringMVC as an example. The microservice name is springmvc, and its base path is /springmvchello, so you should set microserviceName in the URL to springmvchello/sayhi when requesting sayhi. Therefore, the URL for requesting sayhi is cse://springmvc/springmvchello/sayhi?name=Java Chassis.
• During use of this URL format, the ServiceComb framework will perform internal microservice descovery, fallbreak, and fault tolerance and send the requests to the microservice providers.