MS - Call rest service to service call Step1; Call with Simple RestTemplate

 1. Create Service - greet-service with simple message returning service call.

2. Make another service - rest-client and call greet-service

Steps: 

2.1 Create Controller 

2.2 Make ResTemplate object

2.3 using restTemplate object call rest-service eg:greet-service withfindObject

Dependencies

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Appication Properties

spring.application.name=greet-service
server.port=8090

Below are the code blocks

Greet class

public class Greet {

    public Greet(String message) {
        this.message = message;
    }

    private String message;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

@RestController
public class GreetController {

    private String message = "Demo with RestTemplate";

    @RequestMapping("/greet")
    public Greet greet() {
        
        return new Greet(message);
    }
}

2. Make another service - rest-client and call greet-service

Below are code blocks

spring.application.name=rest-client
server.port=8095

package com.example.rest_client.controller;

import com.example.rest_client.model.Greet;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class GreetClientController {

    private RestTemplate restTemplate = new RestTemplate();
//    @Autowired
//    private RestTemplate restTemplate;

    @RequestMapping("/greet-call")
    Greet greet() {
        //Phase 1 - without Discovery/Eureka client
        Greet greet = restTemplate.getForObject("http://localhost:8090/greet", Greet.class);
//With Discovery client - Now we can use service name - and with other option available via eureka server
        // you need to configure DiscoveryClient - else cannot find hte hostname "greet-service" which is registered inEureka server
//        Greet greet = restTemplate.getForObject("http://greet-service/greet", Greet.class);
        return greet;
    }
}