＜artifactId＞spring-cloud-starter-gateway＜/artifactId＞

1.  
   <dependency>
2.  
   <groupId>org.springframework.cloud</groupId>
3.  
   <artifactId>spring-cloud-starter-gateway</artifactId>
4.  
   <version>2.4.4</version>
5.  
   </dependency>

1.  
   spring:
2.  
   cloud:
3.  
   gateway:
4.  
   routes:
5.  
   - id: route-a
6.  
   uri: http://localhost:8081
7.  
   predicates:
8.  
   - Path=/service-a/**
9.  
   - id: route-b
10.  
    uri: http://localhost:8082
11.  
    predicates:
12.  
    - Path=/service-b/**

1.  
   import java.util.UUID;
2.  
    
3.  
   import org.springframework.cloud.gateway.filter.GatewayFilterChain;
4.  
   import org.springframework.cloud.gateway.filter.GlobalFilter;
5.  
   import org.springframework.core.Ordered;
6.  
   import org.springframework.http.server.reactive.ServerHttpRequest;
7.  
   import org.springframework.stereotype.Component;
8.  
   import org.springframework.web.server.ServerWebExchange;
9.  
    
10.  
    import reactor.core.publisher.Mono;
11.  
     
12.  
    @Component
13.  
    public class RequestIdFilter implements GlobalFilter, Ordered {
14.  
     
15.  
    @Override
16.  
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
17.  
    ServerHttpRequest request = exchange.getRequest();
18.  
    String requestId = request.getHeaders().getFirst("X-Request-Id");
19.  
    if (requestId == null) {
20.  
    requestId = UUID.randomUUID().toString();
21.  
    }
22.  
    ServerHttpRequest modifiedRequest = request.mutate().header("X-Request-Id", requestId).build();
23.  
    ServerWebExchange modifiedExchange = exchange.mutate().request(modifiedRequest).build();
24.  
    return chain.filter(modifiedExchange).then(Mono.fromRunnable(() -> {
25.  
    exchange.getResponse().getHeaders().add("X-Request-Id", requestId);
26.  
    }));
27.  
    }
28.  
     
29.  
    @Override
30.  
    public int getOrder() {
31.  
    return Ordered.HIGHEST_PRECEDENCE;
32.  
    }
33.  
     
34.  
    }

1.  
   spring:
2.  
   cloud:
3.  
   gateway:
4.  
   routes:
5.  
   - id: route-a
6.  
   uri: http://localhost:8081
7.  
   predicates:
8.  
   - Path=/service-a/**
9.  
   filters:
10.  
    - name: RequestIdFilter

1.  
   spring:
2.  
   cloud:
3.  
   gateway:
4.  
   globalcors:
5.  
   corsConfigurations:
6.  
   '[/**]':
7.  
   allowedOrigins: "*"
8.  
   allowedMethods: GET,POST,DELETE,PUT
9.  
   globalfilters:
10.  
    - name: RequestIdFilter

这篇好文章是转载于：学新通技术网