硬编码方式配置限流规则

1. pom引入依赖

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

2. 添加配置

   spring.cloud.sentinel.transport.dashboard=localhost:8858
   spring.cloud.sentinel.transport.port=8749
   spring.cloud.sentinel.filter.enabled=false
   

3. 编写启动类

   @EnableDiscoveryClient
   @SpringBootApplication
   public class SentinelGatewayApplication {public static void main(String[] args) {System.setProperty(SentinelConfig.APP_TYPE_PROP_KEY, "1");System.setProperty("csp.sentinel.dashboard.server","localhost:8858");System.setProperty(SentinelConfig.PROJECT_NAME_PROP_KEY,"hello-sentinel-gateway");// 以上参数需要配置SpringApplication.run(SentinelGatewayApplication.class, args) ;}
   }
   

4. 编写限流规则

   @Configuration
   public class FlowRuleConfig {@PostConstructpublic void init(){// 加载限流分组规则this.initCustomizeRule();// 加载限流分组Api// 这个加载会报错this.initCustomizedApis();}/*** 加载限流规则*/private void initCustomizeRule(){log.info("------加载限流分组规则----------");Set<GatewayFlowRule> list = new HashSet<>() ;//1. 按照微服务routeId限流（针对整个微服务）GatewayFlowRule rule = new GatewayFlowRule("hello_nacos_client") ;rule.setResourceMode(SentinelGatewayConstants.RESOURCE_MODE_ROUTE_ID) ;rule.setGrade(RuleConstant.FLOW_GRADE_QPS) ;rule.setIntervalSec(60) ;rule.setCount(4) ;list.add(rule) ;//2. 按照api分组限流(针对api)GatewayFlowRule rule1 = new GatewayFlowRule("hello_nacos_client_1") ;// setResourceMode、setGrade 可以不设置rule1.setResourceMode(SentinelGatewayConstants.RESOURCE_MODE_CUSTOM_API_NAME) ;rule1.setGrade(RuleConstant.FLOW_GRADE_QPS) ;rule1.setIntervalSec(2) ;rule1.setCount(1) ;list.add(rule1) ;//GatewayFlowRule rule2 = new GatewayFlowRule("hello_nacos_client_2") ;// setResourceMode、setGrade 可以不设置rule2.setResourceMode(SentinelGatewayConstants.RESOURCE_MODE_CUSTOM_API_NAME) ;rule2.setGrade(RuleConstant.FLOW_GRADE_QPS) ;rule2.setIntervalSec(10) ;rule2.setCount(2) ;list.add(rule2) ;//GatewayRuleManager.loadRules(list) ;}private void initCustomizedApis() {Set<ApiDefinition> definitions = new HashSet<>();ApiDefinition api1 = new ApiDefinition("hello_nacos_client_1").setPredicateItems(new HashSet<>() {{add(new ApiPathPredicateItem().setPattern("/hello-nacos/hello/index"));}});ApiDefinition api2 = new ApiDefinition("hello_nacos_client_2").setPredicateItems(new HashSet<>() {{add(new ApiPathPredicateItem().setPattern("/hello-nacos/user/add"));add(new ApiPathPredicateItem().setPattern("/hello-nacos/user/**").setMatchStrategy(SentinelGatewayConstants.PARAM_MATCH_STRATEGY_PREFIX));}});definitions.add(api1);definitions.add(api2);GatewayApiDefinitionManager.loadApiDefinitions(definitions);}
   }
   

5. 配置网关路由规则

   spring.cloud.gateway.enabled=true
   spring.cloud.gateway.discovery.locator.lower-case-service-id=true
   spring.cloud.gateway.routes[0].id=hello-nacos-client
   spring.cloud.gateway.routes[0].uri=lb://hello-nacos-client
   spring.cloud.gateway.routes[0].predicates[0]=Path=/hello-nacos/**
   spring.cloud.gateway.routes[0].filters[0]=StripPrefix=1
   

6. 浏览器访问：http://localhost:8080/hello-nacos/hello/index

JSON文件配置限流规则

1. 在【硬编码方式配置限流规则】的基础上去除FlowRuleConfig配置
2. application.properties中添加配置

   # 配置限流规则    
   spring.cloud.sentinel.datasource.ds1.file.file=classpath:sentinel/gateway-flow-rule-sentinel.json
   spring.cloud.sentinel.datasource.ds1.file.dataType=json  
   spring.cloud.sentinel.datasource.ds1.file.rule-type=gw-flow
   # 配置API分组
   spring.cloud.sentinel.datasource.ds2.file.file=classpath:sentinel/gateway-flow-api-group-sentinel.json
   spring.cloud.sentinel.datasource.ds2.file.dataType=json  
   spring.cloud.sentinel.datasource.ds2.file.rule-type=gw-api-group
   

3. 在resources目录下新建目录sentinel
4. 在resource/sentinel目录中新建gateway-flow-rule-sentinel.json

   [{"resource": "hello_nacos_client_1","grade": 1,"resourceMode": 1,"intervalSec": 2,"count": 1},{"resource": "hello_nacos_client_2","grade": 1,"resourceMode": 1,"intervalSec": 10,"count": 2}
   ]
   

5. 在resource/sentinel目录中新建gateway-flow-api-group-sentinel.json

   [{"apiName": "hello_nacos_client_1","predicateItems":[{"pattern": "/hello-nacos/hello/index"}]},{"apiName": "hello_nacos_client_2","predicateItems":[{"pattern": "/hello-nacos/user/add"},{"pattern": "/hello-nacos/user/*","matchStrategy": 1}]}
   ]
   

Nacos文件配置限流规则

1. 在【硬编码方式配置限流规则】的基础上去除FlowRuleConfig配置
2. pom添加依赖

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

3. application.properties中添加配置

   # 配置限流规则    
   spring.cloud.sentinel.datasource.ds1.nacos.dataId=gateway-flow-rule-sentinel.json
   spring.cloud.sentinel.datasource.ds1.nacos.groupId=DEFAULT_GROUP
   spring.cloud.sentinel.datasource.ds1.nacos.dataType=json
   spring.cloud.sentinel.datasource.ds1.nacos.rule-type=gw-flow
   # 配置API分组
   spring.cloud.sentinel.datasource.ds2.nacos.dataId=gateway-flow-api-group-sentinel.json
   spring.cloud.sentinel.datasource.ds2.nacos.groupId=DEFAULT_GROUP
   spring.cloud.sentinel.datasource.ds2.nacos.dataType=json
   spring.cloud.sentinel.datasource.ds2.nacos.rule-type=gw-api-group
   

4. 在nacos控制台上新建gateway-flow-rule-sentinel.json与gateway-flow-api-group-sentinel.json文件并填充JSON内容

Dashboard 启动

1. 执行启动命令

   java -Dcsp.sentinel.app.type=1 -Dcsp.sentinel.dashboard.server=localhost:8858 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard-1.8.6.jar
   

启动dashboard上查看不到网关服务 (使用spring-cloud-alibaba-sentinel-gateway启动则csp.sentinel.app.type=1非必须)

1. 方式一：添加vm启动参数

   -Dcsp.sentinel.app.type=1 
   -Dcsp.sentinel.dashboard.server=localhost:8858
   -Dproject.name=hello-sentinel-gateway
   

2. 方式二：启动类中添加参数

   System.setProperty(SentinelConfig.APP_TYPE_PROP_KEY, "1");
   System.setProperty("csp.sentinel.dashboard.server","localhost:8858");
   System.setProperty(SentinelConfig.PROJECT_NAME_PROP_KEY,"hello-sentinel-gateway");