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pom添加依赖

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-transport-simple-http</artifactId><version>1.8.6</version>
</dependency>
<dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-spring-cloud-gateway-adapter</artifactId><version>1.8.6</version>
</dependency>
<dependency><groupId>javax.annotation</groupId><artifactId>javax.annotation-api</artifactId><version>1.3.2</version><scope>compile</scope>
</dependency>

添加java代码

@Configuration
public class GatewayConfiguration {private final List<ViewResolver> viewResolvers;private final ServerCodecConfigurer serverCodecConfigurer;public GatewayConfiguration(ObjectProvider<List<ViewResolver>> viewResolversProvider, ServerCodecConfigurer serverCodecConfigurer){this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);this.serverCodecConfigurer = serverCodecConfigurer;}@Bean@Order(Ordered.HIGHEST_PRECEDENCE)public SentinelGatewayBlockExceptionHandler sentinelGatewayBlockExceptionHandler() {// Register the block exception handler for Spring Cloud Gateway.return new SentinelGatewayBlockExceptionHandler(viewResolvers, serverCodecConfigurer);}@Bean@Order(-1)public GlobalFilter sentinelGatewayFilter() {return new SentinelGatewayFilter();}@PostConstruct //javax.annotation.PostConstructpublic void doInit() {initBlockHandler();}//处理/自定义返回的例外信息private void initBlockHandler() {Set<GatewayFlowRule> rules = new HashSet<>();rules.add(new GatewayFlowRule("pay_routh1").setCount(2).setIntervalSec(1));GatewayRuleManager.loadRules(rules);BlockRequestHandler handler = new BlockRequestHandler() {@Overridepublic Mono<ServerResponse> handleRequest(ServerWebExchange exchange, Throwable t) {Map<String,String> map = new HashMap<>();map.put("errorCode", HttpStatus.TOO_MANY_REQUESTS.getReasonPhrase());map.put("errorMessage", "请求太过频繁，系统忙不过来，触发限流(sentinel+gataway整合Case)");return ServerResponse.status(HttpStatus.TOO_MANY_REQUESTS).contentType(MediaType.APPLICATION_JSON).body(BodyInserters.fromValue(map));}};GatewayCallbackManager.setBlockHandler(handler);}}