sentinel使用(结合OpenFeign)

前提

需要先安装sentinel。

父项目POM

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <modules>
        <module>provider</module>
        <module>consumer</module>
    </modules>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wzq.example</groupId>
    <artifactId>cloud_sentine_open_feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud_sentine_open_feign</name>
    <description>Demo project for Spring Boot</description>

    <packaging>pom</packaging>

    <properties>
        <java.version>1.8</java.version>
        <spring.cloud.version>Hoxton.SR8</spring.cloud.version>
        <spring.cloud.alibaba.version>2.2.5.RELEASE</spring.cloud.alibaba.version>
        <spring.boot.version>2.2.5.RELEASE</spring.boot.version>
    </properties>

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

    <dependencies>
        <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>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

主要关注:

spring-cloud-starter-alibaba-nacos-discovery

spring-cloud-starter-openfeign

spring-cloud-starter-alibaba-sentinel

服务提供者(子项目)

pom.xml

<?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>cloud_sentine_open_feign</artifactId>
        <groupId>com.wzq.example</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>provider</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.wzq.example</groupId>
            <artifactId>api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

application.yml

spring:
  application:
    name: cloud-sentine-open-feign-provider
  cloud:
    sentinel:
      transport:
        port: 8719
        dashboard: 192.168.60.129:8080
    nacos:
      discovery:
        server-addr: 192.168.60.129:8848
management:
  endpoints:
    web:
      exposure:
        include: "*"

ProviderApplication.java

package com.wzq.example.provider;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class ProviderApplication {

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

}

HelloService.java

package com.wzq.example.api;

public interface HelloService {

    void hello();

}

HelloServiceImpl.java

package com.wzq.example.provider.api.impl;

import com.wzq.example.api.HelloService;
import org.springframework.stereotype.Service;

@Service
public class HelloServiceImpl implements HelloService {

    int i = 0;

    @Override
    public void hello() {
        i++;
        // 异常比例为0.5
        if (i % 2 == 0) {
            throw new RuntimeException("异常!");
        }
        System.out.println("hi!");
    }
}

HelloController.java

package com.wzq.example.provider.controller;

import com.wzq.example.api.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Autowired
    private HelloService helloService;

    @RequestMapping("hello")
    public void hello(){
        this.helloService.hello();
    }

}

服务消费者(子项目)

pom.xml

<?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>cloud_sentine_open_feign</artifactId>
        <groupId>com.wzq.example</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>consumer</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.wzq.example</groupId>
            <artifactId>api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

application.yml

server:
  port: 8081
spring:
  application:
    name: cloud-sentine-open-feign-consumer
  cloud:
    sentinel:
      transport:
        port: 8719
        dashboard: 192.168.60.129:8080
    nacos:
      discovery:
        server-addr: 192.168.60.129:8848
management:
  endpoints:
    web:
      exposure:
        include: "*"
feign:
  sentinel:
    enabled: true # Enable the Sentinel support for feign in the properties file (开启Sentinel支持属性)

ConsumerApplication.java

package com.wzq.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableDiscoveryClient
@EnableFeignClients //开启feign支持
@SpringBootApplication
public class ConsumerApplication {

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

}

HelloService.java

package com.wzq.example.service;

import com.wzq.example.service.fallback.HelloServiceFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

@FeignClient(value = "cloud-sentine-open-feign-provider", fallback = HelloServiceFallback.class)
public interface HelloService {

    @RequestMapping("hello")
    void hello();

}

@FeignClient 远程调用服务提供者的接口,fallback 属性，控流和异常处理

HelloServiceFallback.java

package com.wzq.example.service.fallback;

import com.wzq.example.service.HelloService;
import org.springframework.stereotype.Component;

@Component
public class HelloServiceFallback implements HelloService {
    @Override
    public void hello() {
        System.out.println("hello Service FallBack!");
    }
}

hello与接口中的方法对应，控流和异常处理

TestController.java

package com.wzq.example.controller;

import com.wzq.example.service.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @Autowired
    private HelloService helloService;

    @RequestMapping("test")
    public void test(){
        this.helloService.hello();
    }

}

sentinel控制台

进入sentinel控制台设置服务提供者，控流和降级规则就能看到效果