springcloud -sentinel 用户自定义限流错误处理（仅限限流异常，其他异常请使用fallback属性）

pom依赖

<!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--SpringCloud ailibaba sentinel-datasource-nacos 后续做持久化用到-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        <!--SpringCloud ailibaba sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

yml配置

server:
  port: 8401

spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        #Nacos服务注册中心地址
        server-addr: localhost:8848
    sentinel:
      transport:
        #配置Sentinel dashboard地址
        dashboard: localhost:8080
        #默认8719端口，假如被占用会自动从8719开始依次+1扫描,直至找到未被占用的端口
        port: 8719

#暴露端点
management:
  endpoints:
    web:
      exposure:
        include: '*'

MainApp8401

@EnableDiscoveryClient
@SpringBootApplication
public class MainApp8401
{
    public static void main(String[] args) {
        SpringApplication.run(MainApp8401.class, args);
    }
}

myhandlerclass

public class BlockExceptionHandler {
    public static String exceptionHandler(BlockException blockException){
        return "{className: BlockExceptionHandler, methodName: selfDefineExceptionHandler,exception: "+blockException.getMessage()+"} ";
    }
}

测试controller内附关键注解

@RestController
public class DeSelfController {
    @GetMapping(value = "/selfcon")
    @SentinelResource(value = "selfcon",
            blockHandlerClass = BlockExceptionHandler.class,
            blockHandler = "exceptionHandler"
    )
    public String selfDefineExceptionHandler(){
        return "{className: DeSelfController, methodName: selfDefineExceptionHandler}";
    }
}

添加限流规则