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add sentinel-service
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‎README.md‎

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- [Spring Cloud Consul：服务治理与配置中心](https://juejin.im/post/5db05582f265da4d4c20180f)
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- [Spring Cloud Gateway：新一代API网关服务](https://juejin.im/post/5db6eed6518825644076d0b6)
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- [Spring Boot Admin：微服务应用监控](https://juejin.im/post/5db98a2d518825649c730f81)
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- [Spring Cloud Security：Oauth2使用入门](https://juejin.im/post/5dc013bae51d456e817cec30)
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- [Spring Cloud Security：Oauth2结合JWT使用](https://juejin.im/post/5dc2bec6f265da4d4f65bebe)
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- [Spring Cloud Security：Oauth2实现单点登录](https://juejin.im/post/5dc95a675188256e040db43f)
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- [Spring Cloud Alibaba：Nacos 作为注册中心和配置中心使用](https://juejin.im/post/5dcbf7bc5188250d1f5a78ea)
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## 项目结构
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├── api-gateway -- gateway作为网关的测试服务
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├── admin-server -- admin监控中心服务
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├── admin-client -- admin监控中心监控的应用服务
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└── admin-security-server -- 带登录认证的admin监控中心服务
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├── admin-security-server -- 带登录认证的admin监控中心服务
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├── oauth2-server -- oauth2认证测试服务
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├── oauth2-jwt-server -- 使用jwt的oauth2认证测试服务
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├── oauth2-client -- 单点登录的oauth2客户端服务
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├── nacos-config-client -- 用于演示nacos作为配置中心的nacos客户端
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├── nacos-user-service -- 注册到nacos的提供User对象CRUD接口的服务
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└── nacos-ribbon-service -- 注册到nacos的ribbon服务调用测试服务
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```
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## 公众号

‎sentinel-service/.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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### VS Code ###
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.vscode/

‎sentinel-service/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.7.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.macro.cloud</groupId>
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<artifactId>sentinel-service</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>sentinel-service</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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<spring-cloud.version>Greenwich.SR2</spring-cloud.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.alibaba.cloud</groupId>
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<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
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</dependency>
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<dependency>
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<groupId>com.alibaba.cloud</groupId>
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<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-openfeign</artifactId>
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</dependency>
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<dependency>
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<groupId>com.alibaba.csp</groupId>
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<artifactId>sentinel-datasource-nacos</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>cn.hutool</groupId>
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<artifactId>hutool-all</artifactId>
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<version>4.6.3</version>
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</dependency>
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</dependencies>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-dependencies</artifactId>
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<version>${spring-cloud.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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<dependency>
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<groupId>com.alibaba.cloud</groupId>
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<artifactId>spring-cloud-alibaba-dependencies</artifactId>
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<version>2.1.0.RELEASE</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎sentinel-service/src/main/java/com/macro/cloud/SentinelServiceApplication.java‎

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package com.macro.cloud;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
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import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
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import org.springframework.cloud.openfeign.EnableFeignClients;
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@EnableFeignClients
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@EnableDiscoveryClient
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@SpringBootApplication
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public class SentinelServiceApplication {
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public static void main(String[] args) {
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SpringApplication.run(SentinelServiceApplication.class, args);
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}
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}

‎sentinel-service/src/main/java/com/macro/cloud/config/RibbonConfig.java‎

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package com.macro.cloud.config;
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import com.alibaba.cloud.sentinel.annotation.SentinelRestTemplate;
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import org.springframework.cloud.client.loadbalancer.LoadBalanced;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.client.RestTemplate;
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/**
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* Created by macro on 2019/8/29.
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*/
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@Configuration
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public class RibbonConfig {
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@Bean
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@SentinelRestTemplate
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public RestTemplate restTemplate(){
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return new RestTemplate();
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}
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}

‎sentinel-service/src/main/java/com/macro/cloud/controller/CircleBreakerController.java‎

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package com.macro.cloud.controller;
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import com.alibaba.csp.sentinel.annotation.SentinelResource;
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import com.macro.cloud.domain.CommonResult;
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import com.macro.cloud.domain.User;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.client.RestTemplate;
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/**
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* 熔断功能
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* Created by macro on 2019/11/7.
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*/
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@RestController
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@RequestMapping("/breaker")
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public class CircleBreakerController {
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private Logger LOGGER = LoggerFactory.getLogger(CircleBreakerController.class);
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@Autowired
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private RestTemplate restTemplate;
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@Value("${service-url.user-service}")
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private String userServiceUrl;
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@RequestMapping("/fallback/{id}")
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@SentinelResource(value = "fallback",fallback = "handleFallback")
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public CommonResult fallback(@PathVariable Long id) {
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return restTemplate.getForObject(userServiceUrl + "/user/{1}", CommonResult.class, id);
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}
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@RequestMapping("/fallbackException/{id}")
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@SentinelResource(value = "fallbackException",fallback = "handleFallback2", exceptionsToIgnore = {NullPointerException.class})
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public CommonResult fallbackException(@PathVariable Long id) {
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if (id == 1) {
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throw new IndexOutOfBoundsException();
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} else if (id == 2) {
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throw new NullPointerException();
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}
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return restTemplate.getForObject(userServiceUrl + "/user/{1}", CommonResult.class, id);
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}
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public CommonResult handleFallback(Long id) {
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User defaultUser = new User(-1L, "defaultUser", "123456");
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return new CommonResult<>(defaultUser,"服务降级返回",200);
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}
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public CommonResult handleFallback2(@PathVariable Long id, Throwable e) {
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LOGGER.error("handleFallback2 id:{},throwable class:{}", id, e.getClass());
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User defaultUser = new User(-2L, "defaultUser2", "123456");
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return new CommonResult<>(defaultUser,"服务降级返回",200);
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}
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}

‎sentinel-service/src/main/java/com/macro/cloud/controller/RateLimitController.java‎

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package com.macro.cloud.controller;
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import com.alibaba.csp.sentinel.annotation.SentinelResource;
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import com.alibaba.csp.sentinel.slots.block.BlockException;
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import com.macro.cloud.domain.CommonResult;
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import com.macro.cloud.handler.CustomBlockHandler;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* 限流功能
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* Created by macro on 2019/11/7.
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*/
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@RestController
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@RequestMapping("/rateLimit")
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public class RateLimitController {
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/**
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* 按资源名称限流，需要指定限流处理逻辑
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*/
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@GetMapping("/byResource")
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@SentinelResource(value = "byResource",blockHandler = "handleException")
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public CommonResult byResource() {
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return new CommonResult("按资源名称限流", 200);
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}
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/**
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* 按URL限流，有默认的限流处理逻辑
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*/
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@GetMapping("/byUrl")
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@SentinelResource(value = "byUrl",blockHandler = "handleException")
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public CommonResult byUrl() {
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return new CommonResult("按url限流", 200);
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}
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/**
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* 自定义通用的限流处理逻辑
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*/
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@GetMapping("/customBlockHandler")
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@SentinelResource(value = "customBlockHandler", blockHandler = "handleException",blockHandlerClass = CustomBlockHandler.class)
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public CommonResult blockHandler() {
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return new CommonResult("限流成功", 200);
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}
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public CommonResult handleException(BlockException exception){
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return new CommonResult(exception.getClass().getCanonicalName(),200);
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}
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}

‎sentinel-service/src/main/java/com/macro/cloud/controller/UserFeignController.java‎

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package com.macro.cloud.controller;
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import com.macro.cloud.domain.CommonResult;
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import com.macro.cloud.domain.User;
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import com.macro.cloud.service.UserService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.*;
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/**
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* Created by macro on 2019/8/29.
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*/
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@RestController
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@RequestMapping("/user")
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public class UserFeignController {
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@Autowired
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private UserService userService;
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@GetMapping("/{id}")
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public CommonResult getUser(@PathVariable Long id) {
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return userService.getUser(id);
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}
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@GetMapping("/getByUsername")
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public CommonResult getByUsername(@RequestParam String username) {
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return userService.getByUsername(username);
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}
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@PostMapping("/create")
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public CommonResult create(@RequestBody User user) {
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return userService.create(user);
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}
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@PostMapping("/update")
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public CommonResult update(@RequestBody User user) {
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return userService.update(user);
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}
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@PostMapping("/delete/{id}")
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public CommonResult delete(@PathVariable Long id) {
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return userService.delete(id);
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}
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}

‎sentinel-service/src/main/java/com/macro/cloud/domain/CommonResult.java‎

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package com.macro.cloud.domain;
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/**
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* Created by macro on 2019/8/29.
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*/
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public class CommonResult<T> {
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private T data;
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private String message;
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private Integer code;
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public CommonResult() {
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}
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public CommonResult(T data, String message, Integer code) {
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this.data = data;
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this.message = message;
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this.code = code;
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}
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public CommonResult(String message, Integer code) {
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this(null, message, code);
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}
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public CommonResult(T data) {
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this(data, "操作成功", 200);
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}
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public T getData() {
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return data;
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}
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public void setData(T data) {
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this.data = data;
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}
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public String getMessage() {
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return message;
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}
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public void setMessage(String message) {
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this.message = message;
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}
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public Integer getCode() {
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return code;
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}
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public void setCode(Integer code) {
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this.code = code;
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}
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}

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