五陵年少金市东，银鞍白马渡春风。这篇文章主要讲述#yyds干货盘点# springcloud整合feign实现服务负载均衡,断路器相关的知识，希望能为你提供帮助。
springcloud整合feign实现服务负载均衡,断路器
1.项目目录：

创建项目feign作为父类
2.代码实现：
父类依赖

< parent>
< groupId> org.springframework.boot< /groupId>
< artifactId> spring-boot-starter-parent< /artifactId>
< version> 2.6.2< /version>
< relativePath/> < !-- lookup parent from repository -->
< /parent>
< groupId> com.cxh< /groupId>
< artifactId> feign< /artifactId>
< version> 0.0.1-SNAPSHOT< /version>
< name> feign< /name>
< description> Demo project for Spring Boot< /description>
< packaging> pom< /packaging>
< properties>
< java.version> 8< /java.version>
< spring-cloud-alibaba-dependencies.version> 2021.1< /spring-cloud-alibaba-dependencies.version>
< spring-cloud-dependencies.version> 2021.0.0< /spring-cloud-dependencies.version>
< /properties>

< dependencyManagement>
< dependencies>
< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-dependencies< /artifactId>
< version> $spring-cloud-dependencies.version< /version>
< type> pom< /type>
< scope> import< /scope>
< /dependency>
< dependency>
< groupId> com.alibaba.cloud< /groupId>
< artifactId> spring-cloud-alibaba-dependencies< /artifactId>
< version> $spring-cloud-alibaba-dependencies.version< /version>
< type> pom< /type>
< scope> import< /scope>
< /dependency>
< /dependencies>
< /dependencyManagement>

创建module项目feign-client
添加依赖

< parent>
< groupId> com.cxh< /groupId>
< artifactId> feign< /artifactId>
< version> 0.0.1-SNAPSHOT< /version>
< relativePath/> < !-- lookup parent from repository -->
< /parent>
< groupId> com.cxh< /groupId>
< artifactId> feign-client< /artifactId>
< version> 0.0.1-SNAPSHOT< /version>
< name> feign-client< /name>
< description> Demo project for Spring Boot< /description>
< properties>
< java.version> 1.8< /java.version>
< /properties>
< dependencies>
< dependency>
< groupId> org.springframework.boot< /groupId>
< artifactId> spring-boot-starter< /artifactId>
< /dependency>

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

< !--服务注册-->
< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-starter-alibaba-nacos-discovery< /artifactId>
< version> 0.2.1.RELEASE< /version>
< /dependency>

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

< dependency>
< groupId> org.projectlombok< /groupId>
< artifactId> lombok< /artifactId>
< version> 1.18.20< /version>
< scope> provided< /scope>
< /dependency>
< /dependencies>

yml配置

server:
port: 8001

spring:
application:
name: feign-client #服务名
profiles:
active: dev #环境设置
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848 #nacos服务注册

控制器

@Slf4j
@RestController
public class ClientController

@Value("$server.port")
private String port;

@GetMapping("/add")
public String add(Integer a, Integer b)
Integer c = a + b;
log.info("端口计算：" + port + ":" + c);
return "端口计算：" + port + ":" + c;

启动器添加注解

@SpringBootApplication
@EnableDiscoveryClient
public class FeignClientApplication

public static void main(String[] args)
SpringApplication.run(FeignClientApplication.class, args);

创建module项目feign-client2，这个跟feign-client是一样的，只是yml配置改了个端口，其他代码一样，用于测试负载均衡

server:
port: 8002

spring:
application:
name: feign-client #服务名
profiles:
active: dev #环境设置
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848 #nacos服务注册

创建module项目feign-consumer
添加依赖

< parent>
< groupId> com.cxh< /groupId>
< artifactId> feign< /artifactId>
< version> 0.0.1-SNAPSHOT< /version>
< relativePath/> < !-- lookup parent from repository -->
< /parent>
< groupId> com.cxh< /groupId>
< artifactId> feign-consumer< /artifactId>
< version> 0.0.1-SNAPSHOT< /version>
< name> feign-consumer< /name>
< description> Demo project for Spring Boot< /description>
< properties>
< java.version> 1.8< /java.version>
< /properties>
< dependencies>
< dependency>
< groupId> org.springframework.boot< /groupId>
< artifactId> spring-boot-starter< /artifactId>
< /dependency>

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

< !--服务注册-->
< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-starter-alibaba-nacos-discovery< /artifactId>
< version> 0.2.1.RELEASE< /version>
< exclusions>
< exclusion>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-starter-netflix-ribbon< /artifactId>
< /exclusion>
< /exclusions>
< /dependency>

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

< dependency>
< groupId> org.projectlombok< /groupId>
< artifactId> lombok< /artifactId>
< version> 1.18.20< /version>
< scope> provided< /scope>
< /dependency>

< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-starter-feign< /artifactId>
< version> 1.4.3.RELEASE< /version>
< /dependency>
< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-loadbalancer< /artifactId>
< /dependency>
< dependency>
< groupId> org.springframework.cloud< /groupId>
< artifactId> spring-cloud-starter-netflix-hystrix< /artifactId>
< version> 2.2.10.RELEASE< /version>
< /dependency>

< /dependencies>

yml配置

server:
port: 8003

spring:
application:
name: feign-consumer #服务名
profiles:
active: dev #环境设置
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848 #nacos服务注册

main:
allow-bean-definition-overriding: true

#开启熔断器
feign:
circuitbreaker:
enabled: true

控制器

@Slf4j
@RestController
public class ConsumerController

@Autowired
private ClientService clientService;

@GetMapping("/add")
public String add()
return clientService.add(10, 20);

@FeignClient(value = "https://www.songbingjia.com/android/feign-client", fallback = ClientServiceHystrix.class)
public interface ClientService

@GetMapping("/add")
String add(@RequestParam(vhttps://www.songbingjia.com/android/alue = "a") Integer a, @RequestParam(value = "https://www.songbingjia.com/android/b") Integer b);

@Component
public class ClientServiceHystrix implements ClientService
@Override
public String add(Integer a, Integer b)
return "调用失败";

启动器添加注解

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignConsumerApplication

public static void main(String[] args)
SpringApplication.run(FeignConsumerApplication.class, args);

3.实现效果：
启动nacos后，再启动feign-client, feign-client2, feign-consumer项目，打开浏览器??http://localhost:8003/add??
第一次请求：

端口计算：8001:30

第二次请求：

端口计算：8002:30

关闭feign-client, feign-client2项目后第三请求: 

调用失败

【#yyds干货盘点# springcloud整合feign实现服务负载均衡,断路器】

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