GateWay部分接口理解之GatewayFilter、GlobalFilter

public interface GlobalFilter {
2     Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain);
3 }

全局过滤器

当网关模块，我们定义filter时，首先需要实现上述接口，并加入到spring容器中 ，filter按自己业务是否需要 @Order/接口形式来指定执行的顺序，数字越小，优先级越高。

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@Component public class IPCheckFilter implements GlobalFilter, Ordered {     @Override     public int getOrder() {         return 0;  }         @Override     public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {         // 获取请求头         HttpHeaders headers = exchange.getRequest().getHeaders();         // 根据ip来进行对比         if (getIp(headers).equals("黑名单ip")) {             ServerHttpResponse response = exchange.getResponse();             ResponseData data = new ResponseData();             data.setCode(401);             data.setMessage("非法请求，请联系管理员");             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);     } }

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1	public interface GatewayFilter extends ShortcutConfigurable {}

一般是结合AbstractGatewayFilterFactory来做部分模块自定义过滤的

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public class ValidateCodeFilter extends AbstractGatewayFilterFactory<Object> {     private final static String[] VALIDATE_URL = new String[] { "/auth/login", "/auth/register" };       @Autowired     private ValidateCodeService validateCodeService;       @Autowired     private CaptchaProperties captchaProperties;       private static final String CODE = "code";       private static final String UUID = "uuid";       @Override     public GatewayFilter apply(Object config)     {         return (exchange, chain) -> {             ServerHttpRequest request = exchange.getRequest();               // 非登录/注册请求或验证码关闭，不处理             if (!StringUtils.containsAnyIgnoreCase(request.getURI().getPath(), VALIDATE_URL) || !captchaProperties.getEnabled())             {                 return chain.filter(exchange);             }               try             {                 String rspStr = resolveBodyFromRequest(request);                 JSONObject obj = JSONObject.parseObject(rspStr);                 validateCodeService.checkCapcha(obj.getString(CODE), obj.getString(UUID));             }             catch (Exception e)             {                 return ServletUtils.webFluxResponseWriter(exchange.getResponse(), e.getMessage());             }             return chain.filter(exchange);         };     }       private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest)     {         // 获取请求体         Flux<DataBuffer> body = serverHttpRequest.getBody();         AtomicReference<String> bodyRef = new AtomicReference<>();         body.subscribe(buffer -> {             CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer());             DataBufferUtils.release(buffer);             bodyRef.set(charBuffer.toString());         });         return bodyRef.get();     } }

　　

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spring:   cloud:     gateway:       routes:         # 认证中心         - id: ruoyi-auth           uri: lb://ruoyi-auth           predicates:             - Path=/auth/**           filters:             # 验证码处理             - CacheRequestFilter             - ValidateCodeFilter             - StripPrefix=1

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