springboot cloud alibaba-- LoadB

1.Spring Cloud LoadBalancer 的负载均衡器。

1.Sping cloud loadBanancer 是Spring cloud  官方自己提供的客户端负载均衡器， 用来代替Ribbon。

2. RestTemplate 整合LoadBalancer

2.1 引入依赖 主要的依赖

  <!-- LoadBalancer -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
            <version>2.2.5.RELEASE</version>
        </dependency>

        <!-- 提供了RestTemplate支持 -->
        <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- nacos服务注册与发现 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

2.2 application.yml 配置文件

server:
  port: 8010

spring:
  application:
    name: wudl-alibaba-loadbalance
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.1.180:8848
    # 不使用ribbon
    loadbalancer:
      ribbon:
        enabled: false

2.3 配置类注册bean

package com.wudl.loadbalance.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @ClassName : RestConfig
 * @Description :
 * @Author :wudl
 * @Date: 2021-08-22 15:52
 */

@Configuration
public class RestConfig {

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

2.4请求

package com.wudl.loadbalance.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @ClassName : UserController
 * @Description :
 * @Author :wudl
 * @Date: 2021-08-22 15:54
 */

@RestController
public class UserController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "/getProductInfoMapper/{productNo}")
    public Object  getByUserId(@PathVariable("productNo") Integer productNo)
    {
        String url = "http://product-center/getProductInfoMapper/"+productNo;
        String forObject = restTemplate.getForObject(url, String.class);
        return forObject;
    }

}

Spring cloud-alibaba.png