下载 Nacos 及 Sentinel

链接：https://pan.baidu.com/s/1W5SCjbHEkObh--NaH3jLWw
提取码：kzef

启动 Nacos 及 Sentinel

• 1. 启动 Nacos
     运行 bin/startup.cmd
• 2. 启动 Sentinel
     运行 sentinel.bat

第一个Spring cloud Alibaba 应用

• 1. 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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.suoron</groupId>
    <artifactId>MyFirstSpringCloud</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <!-- 继承父包 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
    </parent>

    <properties>
        <spring-cloud.version>Finchley.SR2</spring-cloud.version>
        <spring-cloud-alibaba.version>0.2.1.RELEASE</spring-cloud-alibaba.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
    </dependencies>

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

    <!--maven的插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>dockerfile-maven-plugin</artifactId>
                <version>1.4.0</version>
                <configuration>
                    <!--  镜像名, 也可以使用${project.artifactId} -->
                    <repository>testspringboot</repository>
                    <buildArgs>
                        <JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
                    </buildArgs>
                </configuration>
            </plugin>

        </plugins>

        <!-- 配置java版本 不配置的话默认父类配置的是1.6-->
        <pluginManagement>
            <plugins>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

</project>

• 2. bootstrap.properties

spring.application.name=server-rpc-test
#cc654f1e-cce5-4b38-935d-3e95bbb712a7 = DEV
spring.cloud.nacos.config.namespace=cc654f1e-cce5-4b38-935d-3e95bbb712a7
spring.cloud.nacos.config.server-addr=localhost:8848
spring.cloud.nacos.discovery.server-addr=localhost:8848
spring.cloud.sentinel.transport.dashboard=localhost:8858
management.endpoints.web.exposure.include=*

• 3. application.yml (可选)

server:
  port: 8080
  tomcat:
    uri-encoding: utf-8

• 4.Spring Boot 启动主类

@SpringBootApplication
@EnableDiscoveryClient
@ComponentScan(basePackages = "com.suoron.springboot.controller")
public class CloudPlatformApplication {
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(CloudPlatformApplication.class, args);
    }

}

5. 服务器提供者

@RestController
public class ProviderController {

    @SentinelResource("service.echo")
    @RequestMapping(value = "/service/echo/{string}", method = RequestMethod.GET)
    public String echo(@PathVariable String string) {
        return "Hello Nacos Discovery " + string;
    }
}

6. 服务消费者

@RestController
public class ConsumerController {

    private final RestTemplate restTemplate;

    @Autowired
    public ConsumerController(RestTemplate restTemplate) {this.restTemplate = restTemplate;}

    @RequestMapping(value = "/api/echo/{str}", method = RequestMethod.GET)
    public String echo(@PathVariable String str) {
        return restTemplate.getForObject("http://server-rpc-test/service/echo/" + str, String.class);
    }
}

测试： http://localhost:8080/api/echo/hello

限流测试

打开网页：http://localhost:8858/

添加限流规则

测试: 多次刷新 http://localhost:8080/api/echo/hello

失败页面