今日代码大赏 | Spring Cloud Gateway 全局过滤器实现

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在构建微服务架构时，Spring Cloud Gateway 作为服务网关，承担着路由转发、权限校验等职责。

全局过滤器（Global Filter）是 Spring Cloud Gateway 中用于处理跨服务的通用逻辑的组件，例如权限验证、日志记录等。

下面是Spring Cloud Gateway中实现全局过滤器的示例代码：

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;import java.nio.charset.StandardCharsets;@Component
public class GlobalAuthFilter implements GlobalFilter, Ordered {private AntPathMatcher antPathMatcher = new AntPathMatcher();@Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {ServerHttpRequest serverHttpRequest = exchange.getRequest();String path = serverHttpRequest.getURI().getPath();// 判断路径中是否包含 "inner"，只允许内部调用if (antPathMatcher.match("/**/inner/**", path)) {ServerHttpResponse response = exchange.getResponse();response.setStatusCode(HttpStatus.FORBIDDEN);DataBufferFactory dataBufferFactory = response.bufferFactory();DataBuffer dataBuffer = dataBufferFactory.wrap("无权限".getBytes(StandardCharsets.UTF_8));return response.writeWith(Mono.just(dataBuffer));}// 统一权限校验，此处应添加JWT等验证逻辑// todo 统一权限校验，通过 JWT 获取登录用户信息return chain.filter(exchange);}/*** 设置过滤器的优先级* 值越小，优先级越高* @return*/@Overridepublic int getOrder() {return 0;}
}