spring cloud gateway + Sentinel 流量限流、熔断自定义响应内容
在Spring Cloud Gateway中使用Sentinel进行流量控制和熔断时,可以通过定制BlockExceptionHandler
来响应限流和熔断时的情况。以下是一个简单的例子:
- 添加依赖(确保你的项目已经引入了Spring Cloud Gateway和Spring Cloud Alibaba Sentinel的相关依赖)
<!-- Spring Cloud Alibaba Sentinel -->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>
- 创建一个
BlockExceptionHandler
类:
import com.alibaba.csp.sentinel.adapter.gateway.sc.exception.SentinelGatewayBlockExceptionHandler;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
public class CustomBlockExceptionHandler implements SentinelGatewayBlockExceptionHandler, Ordered {
@Override
public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
// 定制响应的状态码和内容
exchange.getResponse().setStatusCode(HttpStatus.TOO_MANY_REQUESTS);
exchange.getResponse().getHeaders().setContentType(MediaType.APPLICATION_JSON);
String body = "{\"code\": \"429\", \"message\": \"Too Many Requests\"}";
DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(body.getBytes());
return exchange.getResponse().writeWith(Mono.just(buffer));
}
@Override
public int getOrder() {
// 定义处理器的顺序,数字越小优先级越高
return 0;
}
}
在上述代码中,我们定义了一个CustomBlockExceptionHandler
类,实现了SentinelGatewayBlockExceptionHandler
接口,并设置了响应的状态码和自定义的JSON内容。当Sentinel触发限流或熔断时,Gateway会调用这个处理器返回定制的响应。
- 确保在Spring Cloud Gateway的配置中启用了Sentinel:
spring:
cloud:
gateway:
sentinel:
enabled: true
通过以上步骤,你可以为Spring Cloud Gateway与Sentinel结合使用时的限流和熔断设置自定义响应内容。
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