nacos集成Sentinel、gateway

（一）maven依赖

（1）父项目依赖

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

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

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>0.9.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

（2）子项目service-privoder依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
            <version>1.6.0</version>
        </dependency>

（3）网关依赖

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

（二）注册服务service-privoder到nacos并整合sentinel进行限流

（1）配置文件

1.bootstrap.yml配置

spring:
  application:
    name: privoder-service
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848
      discovery:
        server-addr: 127.0.0.1:8848
    sentinel:
      eager: true
      transport:
        dashboard: localhost:8080
      datasource:
        ds1:
          nacos:
            server-addr: 127.0.0.1:8848
            dataId: ${spring.application.name}-flow-rules
            data-type: json
            rule-type: flow

2.application.yml配置

spring:
  profiles:
    active: dev
server:
  port: 8082
sleep: 1000

（2）添加发现微服务注解

@EnableDiscoveryClient
@SpringBootApplication
public class PrivoderApp {
    public static void main(String[] args) {
        SpringApplication.run(PrivoderApp.class, args);
    }
}

（3）数据实体类

public class Balance {
    private int id;
    private int diamond;
    private int ticket;
    private String message;

    public Balance() {
    }

    public int getId() {
        return id;
    }

    public Balance(int id, int diamond, int ticket) {
        this(id, diamond, ticket, "OK");
    }

    public Balance(int id, int diamond, int ticket, String message) {
        this.id = id;
        this.diamond = diamond;
        this.ticket = ticket;
        this.message = message;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getDiamond() {
        return diamond;
    }

    public void setDiamond(int diamond) {
        this.diamond = diamond;
    }

    public int getTicket() {
        return ticket;
    }

    public void setTicket(int ticket) {
        this.ticket = ticket;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

（4）控制层

@RestController
@RefreshScope
public class BalanceController {

    @Value("${sleep:0}")
    private int sleep;

    final static Map<Integer, Balance> balanceMap = new HashMap() {
        {
            put(1, new Balance(1, 10, 1000));
            put(2, new Balance(2, 0, 10000));
            put(3, new Balance(3, 100, 0));
        }
    };

    @RequestMapping("/service")
    @SentinelResource(value = "protected-resource", blockHandler = "handleBlock")
    public Balance getBalance(Integer id) {
        System.out.println("request: /service?id=" + id + ", sleep: " + sleep);
        if (sleep > 0) {
            try {
                Thread.sleep(sleep);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        if (id != null && balanceMap.containsKey(id)) {
            return balanceMap.get(id);
        }
        return new Balance(0, 0, 0, "不存在");
    }

    public Balance handleBlock(Integer id, BlockException e) {
        return new Balance(0, 0, 0, "限流");
    }
}

（5）nacos添加配置文件

Data ID:privoder-service-flow-rules
格式： json

[
  {
    "resource": "protected-resource",
    "controlBehavior": 2,
    "count": 1,
    "grade": 1,
    "limitApp": "default",
    "strategy": 0
  }
]

（6）访问服务

访问localhost:8012/service?id=1
不断的刷新访问会出现限流提示

（三）网关

（1）application.yml配置

server:
  port: 8010

spring:
  application:
    name: gateway-server
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
    gateway:
      enabled: true
      discovery:
        locator:
          lower-case-service-id: true
      routes:
        # Add your routes here.
        - id: college_route
          uri: lb://provider-service
          predicates:
            - Path=/provider/**

    sentinel:
      transport:
        dashboard: localhost:8011
      datasource.ds1.file:
        file: "classpath: gateway.json"
        ruleType: gw-flow

（2）添加发现微服务注解

@EnableDiscoveryClient
@SpringBootApplication
public class GatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }
}

（3）resource添加gateway.json

[
  {
    "resource": "college_route",
    "count": 2
  }
]