Spring Cloud Gateway：CORS配置

在Spring Cloud Gateway中配置CORS（跨源资源共享）可以通过定义一个全局的过滤器来实现。以下是一个配置全局CORS过滤器的示例代码：

import org.springframework.cloud.gateway.filter.Factory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
 
import java.nio.charset.StandardCharsets;
 
public class CorsGlobalFilter implements Factory<CorsGlobalFilter> {
    @Override
    public CorsGlobalFilter apply(ServerWebExchange exchange) {
        return new CorsGlobalFilter();
    }
 
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpResponse response = exchange.getResponse();
 
        HttpHeaders headers = response.getHeaders();
        headers.set("Access-Control-Allow-Origin", "*");
        headers.set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
        headers.set("Access-Control-Allow-Headers", "Content-Type");
        headers.set("Access-Control-Max-Age", "3600");
 
        if (exchange.getRequest().getMethod() == HttpMethod.OPTIONS) {
            response.setStatusCode(HttpStatus.OK);
            return Mono.empty();
        }
 
        return chain.filter(exchange);
    }
}

然后在配置类中注册这个全局过滤器：

import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
@Configuration
public class CorsConfiguration {
 
    @Bean
    public CorsGlobalFilter corsGlobalFilter() {
        return new CorsGlobalFilter();
    }
}

这样配置后，Spring Cloud Gateway将会对所有的请求添加CORS头部，允许跨域请求。在实际使用时，您可能需要根据实际需求设