微服务通信

1.使用restTemplate 常用语

HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return new RestTemplate().postForObject(
                requestUrl,
                new HttpEntity<>(JSON.toJSONString(xxx), headers),
                xxxx.class
        );

2. 通过注册中心拿到服务的信息(是所有的实例), 再去发起调用

ServiceInstance serviceInstance = loadBalancerClient.choose(
                CommonConstant.AUTHORITY_CENTER_SERVICE_ID
        );
        log.info("Nacos Client Info: [{}], [{}], [{}]",
                serviceInstance.getServiceId(), serviceInstance.getInstanceId(),
                JSON.toJSONString(serviceInstance.getMetadata()));

        String requestUrl = String.format(
                "http://%s:%s/ecommerce-authority-center/authority/token",
                serviceInstance.getHost(),
                serviceInstance.getPort()
        );
        log.info("login request url and body: [{}], [{}]", requestUrl,
                JSON.toJSONString(usernameAndPassword));

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return new RestTemplate().postForObject(
                requestUrl,
                new HttpEntity<>(JSON.toJSONString(usernameAndPassword), headers),
                JwtToken.class
        );