微服务网关springcloud gateway整合sentinel自定义异常

异常包括限流异常和熔断降级异常。

1. 定义配置类方式

package com.ftsafe.config;

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import javax.annotation.PostConstruct;
import java.util.HashMap;

/**
 * 
 */
@Configuration
public class GatewayConfig {

    @PostConstruct
    public void init()
    {
        BlockRequestHandler blockRequestHandler = new BlockRequestHandler() {
            @Override
            public Mono handleRequest(ServerWebExchange exchange, Throwable t) {

                // 自定义异常处理
                HashMap map = new HashMap<>();
                map.put("code", "10099");
                map.put("message", "服务器忙，请稍后再试！");

                return ServerResponse.status(HttpStatus.OK)
                        .contentType(MediaType.APPLICATION_JSON)
                        .body(BodyInserters.fromValue(map));
            }
        };

        GatewayCallbackManager.setBlockHandler(blockRequestHandler);
    }
}

2. 配置方式

spring:
  cloud:
    sentinel:
      scg:
        fallback:
          mode: response
          response-body: "{'code':'10099', 'message': '服务器忙，请稍后再试！'}"

默认的流控降级异常提示不友好，通过自定义流控异常，可以提供更加友好的提示。