- 创建项目
- 配置文件
- 启动类
- 服务
- pom文件
- 验证
一.创建项目
选取Eureka作为服务注册和发现组件
OpenFeign作为服务调用组件
Hystirx作为断路器组件
Hystrix Dashboard作为监控组件
Spring Cloud Sleuth(zipkin)作为链路追踪组件
创建maven项目flow-eureka-consumer02(openfeign, 8782)作为子模块
OpenFeign是一个声明式的Rest客户端(伪客户端), 采用基于接口的注解
默认集成了Ribbon, 实现负载均衡. 整合了Hystrix, 有熔断的能力
二.配置文件
application-eureka-consumer02-dev.yml, 内容如下:
# dev_config
spring:
application:
name: eureka-consumer-feign
zipkin:
base-url: http://localhost:9411
server:
port: 8782
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 3000
circuitBreaker:
requestVolumeThreshold: 5
errorThresholdPercentage: 10
sleepWindowInMilliseconds: 10000
eureka:
instance:
lease-renewal-interval-in-seconds: 5
lease-expiration-duration-in-seconds: 10
client:
service-url:
# 单个配置
# defaultZone: http://localhost:8761/eureka/
# 集群配置
defaultZone: http://127.0.0.1:8761/eureka/, http://127.0.0.1:8762/eureka/
feign:
hystrix:
enabled: true
management:
endpoints:
web:
exposure:
include: "*"
cors:
allowed-origins: "*"
allowed-methods: "*"
info:
company.name: org.flowframework
app.name: eureka-consumer-feign
app.desc: springcloud-eureka-client-consumer-feign
author: robin
三.启动类
Application.java
@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients
@EnableHystrix
@EnableHystrixDashboard
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
return builder.sources(Application.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
四.服务
1.ServiceError.java, 熔断处理
@Component
public class ServiceError implements HelloFeignService {
@Override
public String hello(String name) {
return error(name);
}
// 熔断方法
public String error(String name) {
return "service error";
}
}
2.HelloController.java, 调用consumer01服务
@RestController
@RequestMapping(value = "/hello", produces = "application/json")
public class HelloController {
@Autowired
HelloFeignService helloFeignService;
@Autowired
ConsumerFeignService consumerFeignService;
@RequestMapping(value = "/feign/{name}", method = RequestMethod.GET)
public String hello(@PathVariable("name") String name) {
return helloFeignService.hello(name) + ", response port: 8782";
}
// 调用consumer01服务
@RequestMapping(value = "/consumer/{name}", method = RequestMethod.GET)
public String consumer(@PathVariable("name") String name) {
return consumerFeignService.consumer(name) + ", response port: 8782";
}
}
3.HelloFeignService.java
@FeignClient(value = "eureka-provider", fallback = ServiceError.class)
public interface HelloFeignService {
@RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
String hello(@PathVariable("name") String name);
}
4.ConsumerFeignService.java
@FeignClient(value = "eureka-consumer-ribbon")
public interface ConsumerFeignService {
@RequestMapping(value = "/hello/{name}", method = RequestMethod.GET)
String consumer(@PathVariable("name") String name);
}
五.pom文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.flowframework</groupId>
<artifactId>flow-eureka-consumer02</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.flowframework</groupId>
<artifactId>springcloud</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- eureka-client -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!-- openfeign -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<!-- hystrix -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
</dependency>
<!-- zipkin -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>
</dependencies>
<build>
<finalName>flow-eureka-consumer02</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>
六.验证
1.服务调用
http://localhost:8782/hello/feign/robin
多次请求, 会发现轮流访问不同端口的服务提供者的服务(负载均衡)
Hello robin, service: provider01, response port: 8782
Hello robin, service: provider02, response port: 8782
2.http://localhost:8761/
3.Hystrix Dashboard
http://localhost:8782/hystrix
地址–http://localhost:8782/actuator/hystrix.stream
Delay–2000ms
Title–eureka-consumer-feign
Monitor Stream