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
@RestController
public 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 finished
2022-03-27 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 ms
INFO: Sentinel log output type is: file
INFO: Sentinel log charset is: utf-8
INFO: Sentinel log base directory is: /Users/huli/logs/csp/
INFO: Sentinel log name use pid is: false
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.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 finished
2022-03-28 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 ms
INFO: Sentinel log output type is: file
INFO: Sentinel log charset is: utf-8
INFO: Sentinel log base directory is: /Users/huli/logs/csp/
INFO: Sentinel log name use pid is: false
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
com.alibaba.csp.sentinel.slots.block.flow.FlowException
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