Spring Cloud Gateway 글로벌 필터 소개

public interface GlobalFilter { Mono filter(ServerWebExchange exchange, GatewayFilterChain chain); }

@Configuration public class ExampleConfiguration { private Logger log = LoggerFactory.getLogger(ExampleConfiguration.class); @Bean @Order(-1) public GlobalFilter a() { return (exchange, chain) -> { log.info("first pre filter"); return chain.filter(exchange).then(Mono.fromRunnable(() -> { log.info("third post filter"); })); }; } @Bean @Order(0) public GlobalFilter b() { return (exchange, chain) -> { log.info("second pre filter"); return chain.filter(exchange).then(Mono.fromRunnable(() -> { log.info("second post filter"); })); }; } @Bean @Order(1) public GlobalFilter c() { return (exchange, chain) -> { log.info("third pre filter"); return chain.filter(exchange).then(Mono.fromRunnable(() -> { log.info("first post filter"); })); }; } }

2018-10-14 12:08:52.406 INFO 55062 --- [ioEventLoop-4-1] c.c.gateway.config.ExampleConfiguration : first pre filter 2018-10-14 12:08:52.406 INFO 55062 --- [ioEventLoop-4-1] c.c.gateway.config.ExampleConfiguration : second pre filter 2018-10-14 12:08:52.407 INFO 55062 --- [ioEventLoop-4-1] c.c.gateway.config.ExampleConfiguration : third pre filter 2018-10-14 12:08:52.437 INFO 55062 --- [ctor-http-nio-7] c.c.gateway.config.ExampleConfiguration : first post filter 2018-10-14 12:08:52.438 INFO 55062 --- [ctor-http-nio-7] c.c.gateway.config.ExampleConfiguration : second post filter 2018-10-14 12:08:52.438 INFO 55062 --- [ctor-http-nio-7] c.c.gateway.config.ExampleConfiguration : third post filter

@Component public class IPCheckFilter implements GlobalFilter, Ordered { @Override public int getOrder() { return 0; } @Override public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) { HttpHeaders headers = exchange.getRequest().getHeaders(); // 此处写死了，演示用，实际中需要采取配置的方式 if (getIp(headers).equals("127.0.0.1")) { ServerHttpResponse response = exchange.getResponse(); ResponseData data = new ResponseData(); data.setCode(401); data.setMessage("非法请求"); byte[] datas = JsonUtils.toJson(data).getBytes(StandardCharsets.UTF_8); DataBuffer buffer = response.bufferFactory().wrap(datas); response.setStatusCode(HttpStatus.UNAUTHORIZED); response.getHeaders().add("Content-Type", "application/json;charset=UTF-8"); return response.writeWith(Mono.just(buffer)); } return chain.filter(exchange); } // 这边从请求头中获取用户的实际IP,根据Nginx转发的请求头获取 private String getIp(HttpHeaders headers) { return "127.0.0.1"; } }

exchange.getAttributes().put(GATEWAY_REQUEST_URL_ATTR, requestUrl);

URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);

@Component public class DebugFilter implements GlobalFilter, Ordered { @Override public int getOrder() { return 10101; } @Override public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) { try { exchange.getAttributes().put(GATEWAY_REQUEST_URL_ATTR, new URI("http://192.168.31.245:8081/house/hello2")); } catch (URISyntaxException e) { e.printStackTrace(); } return chain.filter(exchange); } }