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">
    <parent>
        <artifactId>springcloud-demo</artifactId>
        <groupId>demo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-sentinel</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--sentinel-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <!--健康监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!-- mybatis 和SpringBoot 整合-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <!-- MySQL 驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <!-- jdbc -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</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>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
    </dependencies>
</project>

配置

server:
  port: 8002
spring:
  application:
    name: demo-nacos
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.2.20:30569/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root
  cloud:
    nacos:
      server-addr: 192.168.2.20:30010
      username: nacos
      password: nacos
    sentinel:
      transport:
        dashboard: 192.168.2.20:31596    # 控制台的安装位置
        port: 8719    # 与sentinel单独连接的端口
        client-ip: 192.168.2.20    # 本机的ip，如果sentinel装在虚拟机，必须配这个
# 暴露应用信息
management:
  endpoints:
    web:
      exposure:
        include: '*'

接口示例

package com.test.sentinel.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.nacos.common.model.RestResult;
import com.test.sentinel.common.handler.CustomerBlockHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * @author jia
 * @since 2022-04-04 22:06
 */
@RestController
@RequestMapping("/sentinel")
public class TestController {
    @GetMapping("/test1")
    @SentinelResource(value = "customerBlockHandler", blockHandlerClass = CustomerBlockHandler.class,
                      blockHandler = "handlerException")
    public RestResult test1() {
        return new RestResult(200, "success");
    }
    @GetMapping("/test2")
    @SentinelResource(value = "customerBlockHandler", blockHandlerClass = CustomerBlockHandler.class,
                      blockHandler = "handlerException2")
    public RestResult test2() {
        return new RestResult(200, "success");
    }
}

流控处理类

package com.test.sentinel.common.handler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.nacos.common.model.RestResult;
/**
 * @author jia
 * @since 2022-04-04 22:03
 */
public class CustomerBlockHandler {
    public static RestResult handlerException(BlockException ex) {
        return new RestResult(40001, "自定义异常1");
    }
    public static RestResult handlerException2(BlockException ex) {
        return new RestResult(40002, "自定义异常2");
    }
}