springboot整合sentinel完成限流

1、直入正题，下载sentinel的jar包

1.1 直接到Sentinel官网里的releases下即可下载最新版本，Sentinel官方下载地址，直接下载jar包即可。不过慢，可能下载不下来

1.2 可以去gitee去下载jar包

1.3 下载完成后，进行打包，
1.4 执行命令

打开命令行窗口，进入到项目里面，执行：

mvn clean package -DskipTests

2、打包完成后，直接启动

java -jar sentinel-dashboard.jar

3、启动成功

4、web页面

浏览器输入localhost:8084
账号密码：sentinel

5、编写项目，导入pom依赖

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>sentinel</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.7.RELEASE</version>
        <relativePath/>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2.2.5.RELEASE</version>
        </dependency>
    </dependencies>
</project>

6、新建application.yml文件

server:
  port: 8001
spring:
  application:
    name: sentinel-service
  cloud:
    sentinel:
      transport:
        dashboard: localhost:8084
      eager: true
management:
  endpoint:
    web:
      exposure:
        include: '*'

7、新建启动类

package com.xxx;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class SentinelServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(SentinelServiceApplication.class,args);
    }
}

8、新建controller

package com.xxx.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "test")
public class TestController {

    @GetMapping(value = "/a")
    public String test1() {
        return "Hello,Sentinel --> 1";
    }

    @GetMapping(value = "/b")
    public String test2() {
        return "Hello,Sentinel --> 2";
    }
}

9、启动项目，调用接口

http://localhost:8001/test/a
http://localhost:8001/test/b
有的时候在Sentinel控制台的簇点链路只显示/error和/**，无法显示相应的资源
解决方式：将这个依赖版本升级为2.2.5 即可
   <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2.2.5.RELEASE</version>
        </dependency>

10、现在给/test/a限流

点击流控按钮，新增流控规则即可

11、页面展示

连续点击三次，就会出现限流操作，至此 搭建完成。。。