这篇文章将为大家详细讲解有关sentinel如何整合spring cloud限流，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
spring cloud基于http进行服务调用，大致过程如下：
服务提供端：提供http接口，并向服务中心注册服务信息
服务消费端：将服务端的http接口作为本地服务，从注册中心读取服务提供端信息，使用feign发起远程调用
相关依赖
<!-- 服务注册与发现 --> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> <!-- sentinel限流 --> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId> </dependency>示例
为简化处理，直接对url接口进行限流，不做服务调用
application.yml
spring: application: name: hello-sentinel cloud: nacos: discovery: server-addr: localhost:8848 sentinel: transport: dashboard: localhost:8081限流可使用本地配置、或者sentinel dashboard配置
HelloController
@RestControllerpublic class HelloController { @SentinelResource(value = "hello", blockHandler = "blockHandle") @RequestMapping("/hello") public String hello(){ return "hello"; } public String blockHandle(BlockException e){ e.printStackTrace(); return "被限流了";}************
本地限流配置
CustomFlowRule
public class CustomFlowRule implements InitFunc { @Override public void init() throws Exception { List<FlowRule> flowRules = new ArrayList<>(); FlowRule flowRule = new FlowRule(); flowRule.setResource("hello"); flowRule.setCount(1); flowRule.setControlBehavior(RuleConstant.CONTROL_BEHAVIOR_DEFAULT); flowRules.add(flowRule); FlowRuleManager.loadRules(flowRules); }}META-INF/services/com.alibaba.csp.sentinel.init.InitFunc
com.example.demo.rule.CustomFlowRulejmeter 测试
2022-03-27 22:30:50.534 INFO 1791 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''2022-03-27 22:30:50.547 INFO 1791 --- [ main] c.a.c.n.registry.NacosServiceRegistry : nacos registry, DEFAULT_GROUP hello-sentinel 192.168.5.11:8080 register finished2022-03-27 22:30:50.557 INFO 1791 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 2.227 seconds (JVM running for 2.824)2022-03-27 22:31:04.044 INFO 1791 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'2022-03-27 22:31:04.044 INFO 1791 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'2022-03-27 22:31:04.049 INFO 1791 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 5 msINFO: Sentinel log output type is: fileINFO: Sentinel log charset is: utf-8INFO: Sentinel log base directory is: /Users/huli/logs/csp/INFO: Sentinel log name use pid is: falsecom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowException************
sentinel dashboard配置限流
启动sentinel dashboard
java -Dserver.port=8081 -Dcsp.sentinel.dashboard.server=localhost:8081 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard.jar 参数说明：-Dserver.port=8081：指定控制台启动端口-Dcsp.sentinel.dashboard.server：指定控制台地址和端口-Dproject.name=sentinel-dashboard：指定控制台项目名称localhost:8081，控制台配置流控策略
说明：若需使用本地降级方法，需在下方的hello配置流控规则
jmeter 测试
2022-03-28 08:50:29.165 INFO 853 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''2022-03-28 08:50:29.198 INFO 853 --- [ main] c.a.c.n.registry.NacosServiceRegistry : nacos registry, DEFAULT_GROUP hello-sentinel 192.168.5.11:8080 register finished2022-03-28 08:50:29.210 INFO 853 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 3.315 seconds (JVM running for 4.03)2022-03-28 08:52:05.792 INFO 853 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'2022-03-28 08:52:05.793 INFO 853 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'2022-03-28 08:52:05.802 INFO 853 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 9 msINFO: Sentinel log output type is: fileINFO: Sentinel log charset is: utf-8INFO: Sentinel log base directory is: /Users/huli/logs/csp/INFO: Sentinel log name use pid is: falsecom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowExceptioncom.alibaba.csp.sentinel.slots.block.flow.FlowException关于“sentinel如何整合spring cloud限流”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，使各位可以学到更多知识，如果觉得文章不错，请把它分享出去让更多的人看到。
