Introduction to three usages of RestTemplate (code)

This article brings you an introduction to the three ways to use RestTemplate (code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Preparation

I am using a common API on the server side

@RestController
public class ServerController {

    @GetMapping("/msg")
    public String msg(){
        return "this is product' msg";
    }

}

The first way

Use restTemplate directly and write the url

@Slf4j
@RestController
public class ClientController {

    @GetMapping("/getProductMsg")
    public String getProductMsg(){
        // 1、第一种方式（直接使用restTemplate，url写死）
        RestTemplate restTemplate = new RestTemplate();
        String response = restTemplate.getForObject("http://localhost:9082/msg",String.class);
        log.info("response={}",response);
        return response;
    }

}

The second way

The second way (use loadBalancerClient to get the url through the application name, and then use restTemplate)

@Slf4j
@RestController
public class ClientController {

    @Autowired
    private LoadBalancerClient loadBalancerClient;

    @GetMapping("/getProductMsg")
    public String getProductMsg(){

        //2、第二种方式（利用loadBalancerClient通过应用名获取url，然后再使用restTemplate）
        ServiceInstance serviceInstance = loadBalancerClient.choose("PRODUCT");
        String url = String.format("http://%s:%s",serviceInstance.getHost(),serviceInstance.getPort()) + "/msg";
        RestTemplate restTemplate = new RestTemplate();
        String response = restTemplate.getForObject(url,String.class);

        log.info("response={}",response);
        return response;
    }

}

The third way

The third method (using @LoadBalanced, you can use the application name in restTemplate)

@Component
public class RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }

}

@Slf4j
@RestController
public class ClientController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/getProductMsg")
    public String getProductMsg(){

        //3、第三种方式(利用@LoadBalanced，可再restTemplate里使用应用名字)
        String response = restTemplate.getForObject("http://PRODUCT/msg",String.class);

        log.info("response={}",response);
        return response;
    }

}

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