Spring Cloud Gateway 自定义断言(Predicate)

1、类必须是Spring组件 Bean

2、类必须加上RoutePredicateFactory作为结尾

3、类必须继承AbstractRoutePredicateFactory

4、类必须声明静态内部类，声明属性来接收配置文件中对应的断言的信息

5、需要结合shortcutFieldOrder进行绑定

6、通过apply进行逻辑判断，true：配置成功，false：配置失败

package com.wsm.predicates;

import org.springframework.cloud.gateway.handler.AsyncPredicate;
import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;
import org.springframework.cloud.gateway.handler.predicate.GatewayPredicate;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.server.ServerWebExchange;

import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Predicate;

@Component
public class CheckAuthRoutePredicateFactory extends AbstractRoutePredicateFactory<CheckAuthRoutePredicateFactory.Config> {


    public CheckAuthRoutePredicateFactory() {
        super(CheckAuthRoutePredicateFactory.Config.class);
    }

    @Override
    public List<String> shortcutFieldOrder() {
        return Arrays.asList("name");
    }


    @Override
    public Predicate<ServerWebExchange> apply(CheckAuthRoutePredicateFactory.Config config) {
        return new GatewayPredicate() {
            @Override
            public boolean test(ServerWebExchange serverWebExchange) {
                if(config.getName().equals("zhangsan")){
                    return true;
                }
                return false;
            }
        };
    }

    //用于接收配置文件中断言的信息
    @Validated
    public static class Config {
        private String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }

}

- CheckAuth=zhangsan

server:
  port: 8060
spring:
  application:
    name: api-gateway
  cloud:
    # gateway的配置
    gateway:
      # 路由规则
      routes:
        - id: order_route # 路由的唯一标识， 路由到 order
          #          uri: http://localhost:8020 # 需要转发的地址
          uri: lb://order-nacos-service # 需要转发的地址  lb：使用nacos中的本地负载均衡策略
          # 断言规则 用于路由规则的匹配
          predicates:
            - Path=/order-serv/**
              # http://localhost:8060/order-serv/order/add 路由转到
            # http://localhost:8020/order-serv/order/add
#            - After=2017-01-20T17:42:47.789-07:00[Asia/Shanghai]
#            - Header=X-Request-Id,\d+
#            - Method=GET
#            - Query=name,zhangsan|lisi
            - CheckAuth=zhangsan
          filters:
            - StripPrefix=1  # 转发之前去掉第一层路径
              # http://localhost:8020/order-serv/order/add 过虑成
            # http://localhost:8020/order/add
    # 配置 Nacos
    nacos:
      server-addr: 127.0.0.1:8848
      discovery:
        #        server-addr: 127.0.0.1:8848
        username: nacos
        password: nacos
        namespace: public

- CheckAuth=lisi