• SpringCloud无介绍快使用,sentinel服务熔断功能(二十四)


    SpringCloud无介绍快使用,sentinel服务熔断功能(二十四)

    问题背景

    从零开始学springcloud微服务项目
    注意事项:

    • 约定 > 配置 > 编码
    • IDEA版本2021.1
    • 这个项目,我分了很多篇章,每篇文章一个操作步骤,目的是显得更简单明了
    • controller调service,service调dao
    • 默认安装nginx
    • 项目源码以及sentinel安装包

    sentinel整合ribbon+openFeign+fallback

    1 新建两个payment微服务module

    2 选择jdk1.8

    3 输入服务名:cloudalibaba-provider-payment9003 和 cloudalibaba-provider-payment9004

    4 引入pom依赖,cloudalibaba-provider-payment9003 和 cloudalibaba-provider-payment9004两个服务名不同

    <?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>springcloud2022</artifactId>
            <groupId>com.yg</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloudalibaba-provider-payment9003</artifactId>
    
        <dependencies>
            <!--SpringCloud ailibaba nacos -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <dependency><!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
                <groupId>com.yg</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            <!-- SpringBoot整合Web组件 -->
            <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>
            <!--日常通用jar包配置-->
            <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>
    
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    5 添加application.yml文件,cloudalibaba-provider-payment9003 和 cloudalibaba-provider-payment9004端口不同

    server:
      port: 9003
    
    spring:
      application:
        name: nacos-payment-provider
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848 #配置Nacos地址
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'
    
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    6 添加启动类,cloudalibaba-provider-payment9003 和 cloudalibaba-provider-payment9004类名不同

    package com.yg.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:33
     * @Version 2.0
     */
    @SpringBootApplication
    @EnableDiscoveryClient
    public class PaymentMain9003 {
    
        public static void main(String[] args) {
            SpringApplication.run(PaymentMain9003.class, args);
        }
    
    }
    
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    7 添加controller

    package com.yg.springcloud.controller;
    
    import com.yg.springcloud.entities.CommonResult;
    import com.yg.springcloud.entities.Payment;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.HashMap;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:35
     * @Version 2.0
     */
    @RestController
    public class PaymentController {
    
        @Value("${server.port}")
        private String serverPort;
    
        public static HashMap<Long, Payment> hashMap = new HashMap<>();
    
        static {
            hashMap.put(1L, new Payment(1L, "28a8c1e3bc2742d8848569891fb42181"));
            hashMap.put(2L, new Payment(2L, "bba8c1e3bc2742d8848569891ac32182"));
            hashMap.put(3L, new Payment(3L, "6ua8c1e3bc2742d8848569891xt92183"));
        }
    
        @GetMapping(value = "/paymentSQL/{id}")
        public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id) {
            Payment payment = hashMap.get(id);
            CommonResult<Payment> result = new CommonResult(200, "from mysql,serverPort:  " + serverPort, payment);
            return result;
        }
    }
    
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    8 创建cloudalibaba-consumer-nacos-order84微服务,pom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>springcloud2022</artifactId>
            <groupId>com.yg</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloudalibaba-consumer-nacos-order84</artifactId>
    
        <dependencies>
            <!--SpringCloud openfeign -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
    
            <!--SpringCloud ailibaba nacos -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <!--SpringCloud ailibaba sentinel -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            </dependency>
            <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
            <dependency>
                <groupId>com.yg</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            <!-- SpringBoot整合Web组件 -->
            <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>
            <!--日常通用jar包配置-->
            <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>
    
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    9 添加application.yml文件

    server:
      port: 84
    
    
    spring:
      application:
        name: nacos-order-consumer
      cloud:
        nacos:
          discovery:
            server-addr: localhost:8848
        sentinel:
          transport:
            #配置Sentinel dashboard地址
            dashboard: localhost:8080
            #默认8719端口,假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
            port: 8719
    
    
    #消费者将要去访问的微服务名称(注册成功进nacos的微服务提供者)
    service-url:
      nacos-user-service: http://nacos-payment-provider
    
    
    # 激活Sentinel对Feign的支持
    feign:
      sentinel:
        enabled: true
    
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    10 添加启动类

    package com.yg.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:38
     * @Version 2.0
     */
    @SpringBootApplication
    @EnableDiscoveryClient
    @EnableFeignClients
    public class OrderNacosMain84 {
    
        public static void main(String[] args) {
            SpringApplication.run(OrderNacosMain84.class, args);
        }
    
    }
    
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    11 添加payment接口和实现类

    package com.yg.springcloud.service;
    
    import com.yg.springcloud.entities.CommonResult;
    import com.yg.springcloud.entities.Payment;
    import com.yg.springcloud.service.impl.PaymentFallbackService;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:45
     * @Version 2.0
     */
    @FeignClient(value = "nacos-payment-provider", fallback = PaymentFallbackService.class)//调用中关闭9003服务提供者
    public interface PaymentService {
    
        @GetMapping(value = "/paymentSQL/{id}")
        public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id);
    
    }
    
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    package com.yg.springcloud.service.impl;
    
    import com.yg.springcloud.entities.CommonResult;
    import com.yg.springcloud.entities.Payment;
    import com.yg.springcloud.service.PaymentService;
    import org.springframework.stereotype.Component;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:45
     * @Version 2.0
     */
    @Component
    public class PaymentFallbackService implements PaymentService {
    
        @Override
        public CommonResult<Payment> paymentSQL(Long id)
        {
            return new CommonResult<>(444,"服务降级返回,没有该流水信息",new Payment(id, "errorSerial......"));
        }
    
    }
    
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    12 添加配置类

    package com.yg.springcloud.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;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:39
     * @Version 2.0
     */
    
    @Configuration
    public class ApplicationContextConfig {
    
        @Bean
        @LoadBalanced
        public RestTemplate getRestTemplate()
        {
            return new RestTemplate();
        }
    
    
    }
    
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    13 添加controller

    package com.yg.springcloud.controller;
    
    import com.alibaba.csp.sentinel.annotation.SentinelResource;
    import com.yg.springcloud.entities.CommonResult;
    import com.yg.springcloud.entities.Payment;
    import com.yg.springcloud.service.PaymentService;
    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;
    
    import javax.annotation.Resource;
    
    /**
     * @Author suolong
     * @Date 2022/6/22 11:40
     * @Version 2.0
     */
    @RestController
    public class CircleBreakerController {
    
        public static final String SERVICE_URL = "http://nacos-payment-provider";
    
        @Resource
        private RestTemplate restTemplate;
    
        @RequestMapping("/consumer/fallback/{id}")
        @SentinelResource(value = "fallback", fallback = "handlerFallback") //fallback负责业务异常
        public CommonResult<Payment> fallback(@PathVariable Long id) {
            CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id, CommonResult.class, id);
    
            if (id == 4) {
                throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
            } else if (result.getData() == null) {
                throw new NullPointerException("NullPointerException,该ID没有对应记录,空指针异常");
            }
    
            return result;
        }
    
    
        public CommonResult handlerFallback(@PathVariable Long id, Throwable e) {
            Payment payment = new Payment(id, "null");
            return new CommonResult<>(444, "兜底异常handlerFallback,exception内容  " + e.getMessage(), payment);
        }
    
        //==================OpenFeign
        @Resource
        private PaymentService paymentService;
    
        @GetMapping(value = "/consumer/openfeign/{id}")
        public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id) {
            if (id == 4) {
                throw new RuntimeException("没有该id");
            }
            return paymentService.paymentSQL(id);
        }
    
    }
    
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    14 只有fallback配置说明




    15 只配置blockHandler说明


    16 fallback和blockHandler都配置



    若 blockHandler 和 fallback 都进行了配置,则被限流降级而抛出 BlockException 时只会进入 blockHandler 处理逻辑

    17 忽略属性

    18 熔断框架对比

    持久化

    1 更改cloudalibaba-sentinel-service8401的pom

    <?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>springcloud2022</artifactId>
            <groupId>com.yg</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloudalibaba-sentinel-service8401</artifactId>
    
        <dependencies>
            <!--SpringCloud ailibaba sentinel-datasource-nacos -->
            <dependency>
                <groupId>com.alibaba.csp</groupId>
                <artifactId>sentinel-datasource-nacos</artifactId>
            </dependency>
            <dependency><!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
                <groupId>com.yg</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            <!--SpringCloud ailibaba nacos -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            <!--SpringCloud ailibaba sentinel-datasource-nacos 后续做持久化用到-->
            <dependency>
                <groupId>com.alibaba.csp</groupId>
                <artifactId>sentinel-datasource-nacos</artifactId>
            </dependency>
            <!--SpringCloud ailibaba sentinel -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            </dependency>
            <!--openfeign-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            <!-- SpringBoot整合Web组件+actuator -->
            <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>
            <!--日常通用jar包配置-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>4.6.3</version>
            </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>
    
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    2 更改application

    server:
      port: 8401
    
    spring:
      application:
        name: cloudalibaba-sentinel-service
      cloud:
        nacos:
          discovery:
            #Nacos服务注册中心地址
            server-addr: ${REGISTER_HOST:10.10.196.247}:${REGISTER_PORT:8848} #配置Nacos地址
        sentinel:
          transport:
            #配置Sentinel dashboard地址
            dashboard: localhost:8080
            #默认8719端口,假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
            port: 8719
          datasource:
            ds1:
              nacos:
                server-addr: ${REGISTER_HOST:10.10.196.247}:${REGISTER_PORT:8848}
                dataId: cloudalibaba-sentinel-service
                groupId: DEFAULT_GROUP
                data-type: json
                rule-type: flow
    
    management:
      endpoints:
        web:
          exposure:
            include: '*'
    
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    3 在nacos上添加配置文件

    [
        {
            "resource": "/rateLimit/byUrl",
            "limitApp": "default",
            "grade": 1,
            "count": 1,
            "strategy": 0,
            "controlBehavior": 0,
            "clusterMode": false
        }
    ]
    
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    resource:资源名称;
    limitApp:来源应用;
    grade:阈值类型,0表示线程数,1表示QPS;
    count:单机阈值;
    strategy:流控模式,0表示直接,1表示关联,2表示链路;
    controlBehavior:流控效果,0表示快速失败,1表示Warm Up,2表示排队等待;
    clusterMode:是否集群

    4 启动8401后刷新sentinel发现业务规则有了

    SpringCloud无介绍快使用,Seata处理分布式事务(二十五)
    SpringCloud无介绍快使用,sentinel服务熔断功能(二十四)
    SpringCloud无介绍快使用,sentinel注解@SentinelResource的基本使用(二十三)
    SpringCloud无介绍快使用,sentinel热点key限流与系统规则的基本使用(二十二)
    SpringCloud无介绍快使用,sentinel熔断降级和限流的基本使用(二十一)
    SpringCloud无介绍快使用,Nacos集群和Nginx代理(二十)
    SpringCloud无介绍快使用,nacos配置中心的基本使用(十九)
    SpringCloud无介绍快使用,nacos注册中心的基本使用(十八)
    SpringCloud无介绍快使用,gateway通过微服务名实现动态路由(十七)
    SpringCloud无介绍快使用,gateway的基本使用(十六)
    SpringCloud无介绍快使用,Ribbon负载均衡工具与OpenFeign的使用(十五)
    SpringCloud无介绍快使用,使用Zookeeper替换Eureka服务注册与发现(十四)
    SpringCloud无介绍快使用,服务发现Discovery和Eureka自我保护(十三)
    SpringCloud无介绍快使用,集群cloud-provider-payment8002搭建(十二)
    SpringCloud无介绍快使用,集群Eureka服务注册中心cloud-eureka-server7002搭建(十一)
    SpringCloud无介绍快使用,单机Eureka服务注册中心cloud-eureka-server7001搭建(十)
    SpringCloud无介绍快使用,新建cloud-api-commons公共模块module(九)
    SpringCloud无介绍快使用,新建子module消费者订单模块(八)
    SpringCloud无介绍快使用,热部署devtools配置(七)
    SpringCloud无介绍快使用,子module提供者支付微服务业务开发(六)
    SpringCloud无介绍快使用,新建子module提供者支付微服务yml整合和新建启动类(五)
    SpringCloud无介绍快使用,新建子module提供者支付微服务pom整合(四)
    SpringCloud无介绍快使用,springcloud父工程pom文件整理(三)
    SpringCloud无介绍快使用,IDEA新建springcloud父工程(二)
    SpringCloud无介绍快使用,与Spingboot之间的兼容版本选择(一)




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  • 原文地址:https://blog.csdn.net/cucgyfjklx/article/details/125435061