一、Predicate - 断⾔

 1、简单用法

spring:cloud:gateway:routes:- id: after_routeuri: https://example.orgpredicates:- After=2017-01-20T17:42:47.789-07:00[America/Denver]

 2、自定义断言

新建类VipRoutePredicateFactory，注意VipRoutePredicateFactory名字的前缀和yml文件的配置必须一致，即yml文件必须配置为前缀Vip

import jakarta.validation.constraints.NotEmpty;
import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.cloud.gateway.handler.predicate.GatewayPredicate;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.server.ServerWebExchange;import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;@Component
public class VipRoutePredicateFactory extends AbstractRoutePredicateFactory<VipRoutePredicateFactory.Config> {public VipRoutePredicateFactory() {super(Config.class);}@Overridepublic Predicate<ServerWebExchange> apply(Config config) {return new GatewayPredicate() {@Overridepublic boolean test(ServerWebExchange serverWebExchange) {// localhost/search?q=haha&user=leifengyangServerHttpRequest request = serverWebExchange.getRequest();String first = request.getQueryParams().getFirst(config.param);return StringUtils.hasText(first) && first.equals(config.value);}};}@Overridepublic List<String> shortcutFieldOrder() {return Arrays.asList("param", "value");}/*** 可以配置的参数*/@Validatedpublic static class Config {@NotEmptyprivate String param;@NotEmptyprivate String value;public @NotEmpty String getParam() {return param;}public void setParam(@NotEmpty String param) {this.param = param;}public @NotEmpty String getValue() {return value;}public void setValue(@NotEmpty String value) {this.value = value;}}
}

yml文件配置：

spring:cloud:gateway:routes:- id: after_routeuri: https://example.orgpredicates:- After=2017-01-20T17:42:47.789-07:00[America/Denver]- Vip=user,wangcj  #表示传了参数user为wangcj的才满足要求