方式一: loadBalancerClient+restTemplate拼接路径方式

/*spring cloud common提供的服务治理接口,负载均衡客户端*/
        @Autowired
        LoadBalancerClient loadBalancerClient;
/*原始方式:拼接路径*/
        @GetMapping("/test1")
        public String test() {
            RestTemplate restTemplate = new RestTemplate();
            /*choos函数:负载均衡的选出一个服务实例*/
            ServiceInstance serviceInstance = loadBalancerClient.choose("test-nacos-server");
            /*拼接方式一:*/
            System.out.println("http://" + serviceInstance.getHost() + ':' + serviceInstance.getPort() + "/test?msg=nacos");
            /*拼接方式二:*/
            String url = serviceInstance.getUri() + "/test?msg=nacos";
            String result = restTemplate.getForObject(url, String.class);
            String msg = url + "---- return : " + result;
            System.out.println(msg);
            return msg;
        }

方式二: restTemplate加入@LoadBalanced注解

@Autowired
        RestTemplate restTemplate;

        /*注解方式:填写请求路径*/
        @GetMapping("/test2")
        public String test2() {
            /*直接请求服务名*/
            String url = "http://test-nacos-server/test?msg=restTemplate";
            String res = restTemplate.getForObject(url, String.class);
            System.out.println(res);
            return res;
        }

        @Bean
        /*增加@LoadBalanced注解*/
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }

方式三: loadBalancerClient+ WebClient(spring 5引入)拼接路径方式

1.pom修改:将spring-boot-starter-web改为spring-boot-starter-webflux

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

2.WebClient相关信息以及实例可以看官网(有示例比较好)

https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html#webflux-client-builder-reactor

3.基本方法

4.代码:

/*spring cloud common提供的服务治理接口,负载均衡客户端*/
@Autowired
LoadBalancerClient loadBalancerClient;

/*spring 5 提供的webclient*/
@GetMapping("/test3")
public Mono<String> test3() {
    ServiceInstance instance = loadBalancerClient.choose("test-nacos-server");
    String url = instance.getUri() + "/test?msg=nacos";
    /*构建方式一(简单版):create*/
    Mono<String> mono = WebClient.create(url).get().retrieve().bodyToMono(String.class);
    /*构建方式二:builder*/
    Mono<String> toMono = WebClient.builder().baseUrl(url).build().get().retrieve().bodyToMono(String.class);
    System.out.println(url);
    return toMono;
}

*为了测试后面的方式是否负载,把服务提供方稍微改了一下:

方式四: webclient加入@LoadBalanced注解

@Bean
@LoadBalanced
/*构造webclient,加入@LoadBalanced注解*/
public WebClient.Builder webClientBuilder() {
    return WebClient.builder();
}
@Autowired
private WebClient.Builder webClientBuilder;

@GetMapping("/test4")
public Mono<String> test4() {
    String url = "http://test-nacos-server/test?msg=restTemplate";
    Mono<String> mono = webClientBuilder.build()
                    .get()
                    .uri(url)
                    .retrieve()
                    .bodyToMono(String.class);
     return mono;
}

方式五: feign

1.pom添加:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2.创建Feign客户端(接口)

@FeignClient("test-nacos-server")
public interface ClientForFeign {
    @GetMapping("/test")
    String test(@RequestParam(name = "msg") String msg);
}

3.加入@EnableFeignClients注解,开启扫描Spring Cloud Feign客户端的功能

4.在Controller中实现

@Autowired
private ClientForFeign clientForFeign;

@GetMapping("/test5")
public String test5() {
    String s = clientForFeign.test("nacos");
    return s;
}

完事