SpringCloud Ribbon负载均衡代码实例

SpringCloud Ribbon负载均衡代码实例

1.添加依赖

　　org.springframework.boot

　　spring-boot-starter-web

　　org.springframework.cloud

　　spring-cloud-starter-netflix-eureka-client

　　org.springframework.cloud

　　spring-cloud-starter-netflix-ribbon

org.projectlombok

lombok

true

2.修改启动类

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;

import org.springframework.context.annotation.Bean;

import org.springframework.web.client.RestTemplate;

@SpringBootApplication

@MapperScan("cn.ytheng.order_service")

public class OrderServiceApplication {

/**

* @Loadbalanced负载均衡策略

*/

@Bean

@LoadBalanced

public Rhttp://estTemplate restTemplate() {

return new RestTemplate();

}

public static void main(String[] args) {

SpringApplication.run(OrderServiceApplication.class, args);

}

}

3.添加Controller

import cn.theng.order_service.utils.RibbonUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.cloud.client.ServiceInstance;

import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;

import org.springframework.util.LinkedMultiValueMap;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;

import java.util.HashMap;

import java.util.Map;

@RestController

@RequestMapping("/api/v1/order")

public class ProductOrderController {

@RequestMapping("/test")

public Object test(@RequestParam("product_id") int productId) {

//方法一

// ServiceInstance instance = loadBalancerClient.choose("product-service");

// String url = String.format("http://%s:%s/api/v1/product/find?id=" + productId, instance.getHost(), instance.getPort());

// RestTemplate template = new RestTemplate();

// Map map2 = template.getForObject(url, Map.class);

//负载均衡

//商品列表启用两个节点时

//由客户端来自动选择节点，可能是8771端口，也有可能是8772端口

//参数id名称需要保持一致

//方法二(推荐)

String uri = "http://product-service/api/v1/product/find?id={id}";

Map request = new HashMap<>();

request.put("id", productId);

Map map3 = RibbonUtils.get(uri, Map.class, request);

return "success";

}

@PostMapping("/test2")

public Object test2(@RequestParam("product_id") int productId) {

Product product = new Product();

product.setId(productId);

String uri = "http://product-service/api/v1/product/find2";

LinkedMultiValueMap headers = new LinkedMultiValueMap<>();

headers.add("token", "theng");

Object result = RibbonUtils.post(uri, Object.class, product, headers);

return "success";

}

}

4.添加Ribbon调用公共类

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.http.*;

import org.springframework.stereotype.Component;

import org.springframework.util.LinkedMultiValueMap;

import org.springframework.web.client.RestTemplate;

import javax.annotation.PostConstruct;

import java.util.Arrays;

import java.util.Collections;

import java.util.Map;

@Component

public class RibbonUtils {

@Autowired

private RestTemplate restTemplate;

private static RestTemplate template;

//@PostConstruct修饰的方法会在服务器加载Servlet的时候运行，并且只会被服务器调用一次

@PostConstruct

public void init() {

template = restTemplate;

}

/**

*

* @param uri 接口地址

* @param responseType 返回类型

*

* */

public static T get(String uri, Class responseType) {

return template.getForObject(uri, responseType);

}

/**

*

* @param uri 接口地址

* @param responseType 返回类型

* @param request 传递参数

*

* */

public static T get(String uri, Class responseType, Map request) {

return template.getForObject(uri, responseType, request);

}

/**

*

* @param uri 接口地址

* @param responhttp://seType 返回类型

* @param request 传递参数

* @param headerMap 报头信息

*

* */

public static T get(String uri, Class responseType, Map request, Map headerMap) {

//添加报头

HttpHeaders headers = new HttpHeaders();

headers.setAccept(ArrneKmHKCWMays.asList(MediaType.APPLICATION_jsON));

for(Map.Entry entry : headerMap.entrySet()){

String mapKey = entry.getKey();

String mapValue = entry.getValue();

headers.add(mapKey, mapValue);

}

//body的类型定为String,这里使用get没有用到body,post会使用到

HttpEntity entity = new HttpEntity(null, headers);

ResponseEntity result = template.exchange(uri, HttpMethod.GET, entity, responseType, request);

return result.getBody();

}

/**

*

* @param uri 接口地址

* @param responseType 返回类型

* @param body 传递实体

* @param headers 报头信息

*

* */

public static T post(String uri, Class responseType, Object body, LinkedMultiValueMap headers) {

if (!headers.containsKey("Content-Type")) {

headers.put("Content-Type", Collections.singletonList("application/json;charset=UTF-8"));

}

HttpEntity request = new HttpEntity(body, headers);

Object obj = template.postForObject(uri, request, responseType);

return (T) obj;

}

}

5.在PostMan上测试两个接口即可

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