Kite的学习历程SpringCloud之Hystrix服务降级客户端通配服务降级
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2024-03-20 22:11:22
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Kite学习历程的第二十三天
目录
1. 客户端的通配服务降级
1.1 创建客户端cloud-consumer-feign-hystrix-order-81
1.1.1 修改pom.xml文件引入依赖
<?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">
<parent>
<artifactId>demo01cloud</artifactId>
<groupId>cn.kitey.spring</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-feign-hystrix-order-81</artifactId>
<dependencies>
<!--引入hystrix-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<!--openfeign依赖的引入-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!--引入自己创建的entities包-->
<dependency>
<groupId>cn.kitey.spring</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--监控-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId><!-- -->
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
1.1.2 创建application.yml配置文件
记住打开hytsrix支持
server:
port: 81
eureka:
client:
register-with-eureka: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka
#让其支持hytrix
feign:
hystrix:
enabled: true
1.1.3 创建主启动类
package cn.kitey.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients
@EnableHystrix
public class OrderHystrixMain81 {
public static void main(String[] args) {
SpringApplication.run(OrderHystrixMain81.class, args);
}
}
1.1.4 创建业务类 service, contrller
- 创建service中的PaymentHystrixService接口
注意添加标签:
@FeignClient(value = “CLOUD-PROVIDER-HYSTRIX-PAYMENT”, fallback = PaymentFallbackService.class)
后面的fallback 指明了降级通配的服务方法
package cn.kitey.springcloud.service;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
@Component
@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT", fallback = PaymentFallbackService.class)
public interface PaymentHystrixService {
@GetMapping("/payment/hystrix/ok/{id}")
String paymentInfo_OK(@PathVariable("id") Long id);
@GetMapping("/payment/hystrix/timeout/{id}")
String paymentInfo_TimeOut(@PathVariable("id") Long id);
}
- 创建通配服务类PaymentFallbackService 继承上面接口
package cn.kitey.springcloud.service;
import org.springframework.stereotype.Component;
@Component
public class PaymentFallbackService implements PaymentHystrixService {
@Override
public String paymentInfo_OK(Long id) {
return "PaymentFallbackService--paymentInfo_OK 服务降级";
}
@Override
public String paymentInfo_TimeOut(Long id) {
return "PaymentFallbackService--paymentInfo_TimeOut 服务降级";
}
}
- 创建controller包中的OrderHytrixController
package cn.kitey.springcloud.controller;
import cn.kitey.springcloud.service.PaymentHystrixService;
import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
@Slf4j
public class OrderHytrixController {
@Resource
private PaymentHystrixService paymentHystrixService;
@GetMapping("/consumer/payment/hystrix/ok/{id}")
public String paymentInfo_OK(@PathVariable("id") Long id){
String result = paymentHystrixService.paymentInfo_OK(id);
return result;
}
@GetMapping("/consumer/payment/hystrix/timeout/{id}")
public String paymentInfo_TimeOut(@PathVariable("id") Long id){
return paymentHystrixService.paymentInfo_TimeOut(id);
}
}
1.2 进行测试服务降级是否测试成功
- 首先打开8001, 7001 ,以及客户端81
这时访问:
http://localhost:81/consumer/payment/hystrix/ok/1
访问成功 - 关闭8001服务端口,模拟服务器宕机
3.
进行访问:
http://localhost:81/consumer/payment/hystrix/ok/1
这时没有出现异常,而是调用了服务降级的方法。表明配置成功!