SpringCloudGateway的两种使用方式，结合StripPrefixFilterFilterFactory和PrefixPathGatewayFilterFactory核心代码

Spring Cloud Gateway 组件的核心是通过一系列的过滤器，通过这些过滤器可以将客户端发送的请求转发（路由）到对应的微服务。

• route：由id、uri、predicate、filters组成
• predicate：即断言，匹配路由的部件，支持正则表达式
• filters：过滤器，在断言匹配后执行，对路由信息进行操作，也可以操作header、参数等

注意：由于gateway默认依赖webflux，所以不需要加入springboot-web的依赖，否则会报错；
同时，本次实验使用的是Zookeeper作为注册中心，所以不需要加入eureka-client的依赖，否则启动报错

	org.springframework.cloud
	spring-cloud-starter-gateway



	org.springframework.cloud
	spring-cloud-starter-zookeeper-discovery
	
	
		
			org.apache.zookeeper
			zookeeper
		
	


	org.springframework.cloud
	spring-cloud-starter-zookeeper-config

server:
  port: 9527

spring:
  profiles:
	active:
  application:
	name: springcloud-gateway
  cloud:
	gateway:
	  routes:
		- id: devilvan-route-strip
		  uri: lb://devilvan-caches/caches
		  predicates:
			# 匹配满足条件的路由
			- Path=/caches/cachesController
						PathRoutePredicateFactory pathRoutePredicateFactory = new PathRoutePredicateFactory();
						PathRoutePredicateFactory.Config pathRouteConfig = pathRoutePredicateFactory.newConfig();
						List pattern4StripPrefix = new ArrayList<>();
						pattern4StripPrefix.add("/caches/cachesController
						StripPrefixGatewayFilterFactory stripPrefixGatewayFilterFactory = new StripPrefixGatewayFilterFactory();
						StripPrefixGatewayFilterFactory.Config stripConfig = stripPrefixGatewayFilterFactory.newConfig();
						stripConfig.setParts(1);
						stripPrefixGatewayFilterFactory.apply(stripConfig);
						
						predicateSpec.predicate(pathRoutePredicateFactory.apply(pathRouteConfig))
								.filters(new Function() {
									@Override
									public UriSpec apply(GatewayFilterSpec gatewayFilterSpec) {
										return gatewayFilterSpec.filter(stripPrefixGatewayFilterFactory.apply(stripConfig));
									}
								});
						return predicateSpec.uri("lb://devilvan-caches/caches");
					}
				})
				.route("devilvan-route-prefix", new Function() {
					@Override
					public Route.AsyncBuilder apply(PredicateSpec predicateSpec) {
						PathRoutePredicateFactory pathRoutePredicateFactory = new PathRoutePredicateFactory();
						PathRoutePredicateFactory.Config pathRouteConfig = pathRoutePredicateFactory.newConfig();
						List pattern4PrefixPath = new ArrayList<>();
						pattern4PrefixPath.add("/**");
						pathRouteConfig.setPatterns(pattern4PrefixPath);
						// filters
						PrefixPathGatewayFilterFactory prefixPathGatewayFilterFactory = new PrefixPathGatewayFilterFactory();
						PrefixPathGatewayFilterFactory.Config prefixPathConfig = prefixPathGatewayFilterFactory.newConfig();
						prefixPathConfig.setPrefix("/cachesController");
						// 组装predicate和filter
						predicateSpec.predicate(pathRoutePredicateFactory.apply(pathRouteConfig))
								.filters(new Function() {
									@Override
									public UriSpec apply(GatewayFilterSpec gatewayFilterSpec) {
										return gatewayFilterSpec.filter(prefixPathGatewayFilterFactory.apply(prefixPathConfig));
									}
								});
						return predicateSpec.uri("lb://devilvan-caches/caches");
					}
				})
				.build();
	}
}