sentinel的使用，流量控制

Author: “Rain-with-me”

spring-cloud-alibaba-sentinel-dashboard-8081/pom.xml

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+<?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">
+    <parent>
+        <artifactId>1-spring-cloud-alibaba-register</artifactId>
+        <groupId>org.example</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-cloud-alibaba-sentinel-dashboard-8081</artifactId>
+
+
+    <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.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>runtime</scope>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.alibaba.cloud</groupId>
+            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-cloud-alibaba-sentinel-dashboard-8081/src/main/java/com/lu/sentinel/SentinelApplication.java

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+package com.lu.sentinel;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @Author: 雨同我
+ * @Description:
+ * @DateTime: 2022/9/30 17:34
+ **/
+@SpringBootApplication
+public class SentinelApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(SentinelApplication.class,args);
+    }
+}

spring-cloud-alibaba-sentinel-dashboard-8081/src/main/java/com/lu/sentinel/controller/TestController.java

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+package com.lu.sentinel.controller;
+
+import com.lu.sentinel.service.TestService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+
+@RestController
+public class TestController {
+
+
+    @Autowired
+    private TestService testService;
+
+    /**
+     * @Description: 测试限流QBS
+     * QPS（Queries-per-second，每秒钟的请求数量）：当调用该api的QPS达到阈值的时候，进行限流；
+     * @Author: 雨同我
+     * @DateTime: 2022/9/30 17:51
+    */
+    @GetMapping("test-qps")
+    public String test() throws InterruptedException {
+//        TimeUnit.SECONDS.sleep(1);
+        return "test";
+    }
+    
+    /** 
+     * @Description: 测试关联
+     * @Author: 雨同我
+     * @DateTime: 2022/10/2 16:02
+    */
+    @GetMapping("link-1")
+    public String link_1()  {
+        return "link-1"+testService.chainPath();
+    }
+    @GetMapping("link-2")
+    public String link_2()  {
+        return "link-2"+testService.chainPath();
+    }
+}

spring-cloud-alibaba-sentinel-dashboard-8081/src/main/java/com/lu/sentinel/service/TestService.java

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+package com.lu.sentinel.service;
+
+import com.alibaba.csp.sentinel.annotation.SentinelResource;
+import org.springframework.stereotype.Service;
+
+/**
+ * @Author: 雨同我
+ * @Description:
+ * @DateTime: 2022/10/2 16:31
+ **/
+@Service
+public class TestService {
+    @SentinelResource("/chain-path")
+    public String chainPath(){
+        return "chain-path";
+    }
+}

spring-cloud-alibaba-sentinel-dashboard-8081/src/main/resources/application.yml

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+server:
+  port: 8081
+spring:
+  application:
+    name: sentinel-server
+  cloud:
+    sentinel:
+      transport:
+        dashboard: localhost:8080
+        # sentinel客户端和控制台通信的端口，默认为8719，如果这个端口已经被占用
+        #，那么sentinel会自动从8719开始依次+1扫描，直到找到未被占用的端口。
+        port: 8790

spring-cloud-alibaba-sentinel-dashboard-8081/target/classes/application.yml

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+server:
+  port: 8081
+spring:
+  application:
+    name: sentinel-server
+  cloud:
+    sentinel:
+      transport:
+        dashboard: localhost:8080
+        # sentinel客户端和控制台通信的端口，默认为8719，如果这个端口已经被占用
+        #，那么sentinel会自动从8719开始依次+1扫描，直到找到未被占用的端口。
+        port: 8790