springcloud gateway自定义断言规则详解,以后缀结尾进行路由

springcloud gateway自定义断言规则,后缀结尾进行路由
- 1.新建一个路由断言工厂ExtCheckRoutePredicateFactory
- 2.修改gateway配置
- 3.修改gateway源码，将自定义断言类加到系统 predicates里
Gateway自定义路由断言工厂类
- application.yml文件
- 路由断言工厂配置类

springcloud gateway自定义断言规则,后缀结尾进行路由

因工作需要，需要使用springcloud gateway ,以.html结尾的进行路由进行websocket转发。

gateway自带的8种路由规则都不能满足，故需要自定义断言规则。

1.新建一个路由断言工厂ExtCheckRoutePredicateFactory

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									@Component

									public class ExtCheckRoutePredicateFactory extends AbstractRoutePredicateFactory<ExtCheckRoutePredicateFactory.Config> {

									    public ExtCheckRoutePredicateFactory() {

									        super(Config.class);

									    }

									    @Override

									    public Predicate<ServerWebExchange> apply(Config config) {

									        return new Predicate<ServerWebExchange>() {

									            @Override

									            public boolean test(ServerWebExchange serverWebExchange) {

									                String url=serverWebExchange.getRequest().getURI().toString();

									                if(url.endsWith(".html")){

									                    return true;

									                }

									                return false;

									            }

									        };

									    }

									    public static class Config{

									        private String name;

									        public String getName(){

									            return name;

									        }

									        public void setName(String name){

									            this.name=name;

									        }

									    }

									}

如果以.html结尾，则匹配此路由

2.修改gateway配置

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									gateway:

									    routes:

									      - id: abc

									        uri: http://localhost:8080

									        predicates:

									          - name: ExtCheck

ExtCheck即是我们新建断言工厂的前缀名，自动识别的。

这时运行发现，系统根本找不到我们自定义的断言类。

需要第三步

3.修改gateway源码，将自定义断言类加到系统 predicates里

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									@Bean

									 public RouteLocator routeDefinitionRouteLocator(GatewayProperties properties,

									  List<GatewayFilterFactory> gatewayFilters,

									  List<RoutePredicateFactory> predicates,

									  RouteDefinitionLocator routeDefinitionLocator,

									  ConfigurationService configurationService) {

									  predicates.add(new ExtCheckRoutePredicateFactory());

									  return new RouteDefinitionRouteLocator(routeDefinitionLocator, predicates,

									    gatewayFilters, properties, configurationService);

									 }

再次运行，成功根据.html后缀转发，done!

Gateway自定义路由断言工厂类

application.yml文件

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									server:

									  port: 7000

									spring:

									  zipkin:

									    base-url: http://127.0.0.1:9411/  #zipkin server的请求地址

									    discoveryClientEnabled: false #让nacos把它当成一个URL，而不要当做服务名

									  sleuth:

									    sampler:

									      probability: 1.0  #采样的百分比

									  application:

									    name: api-gateway

									  cloud:

									    nacos:

									      discovery:

									        server-addr: localhost:8848 # 将gateway注册到nacos

									    gateway:

									      discovery:

									        locator:

									          enabled: true # 让gateway从nacos中获取服务信息

									      routes:

									        - id: product_route

									          uri: lb://service-product

									          order: 1

									          predicates:

									            - Path=/product-serv/**

									          filters:

									            - StripPrefix=1

									        - id: order_route

									          uri: lb://service-order

									          order: 1

									          predicates:

									            - Path=/order-serv/**

									            - Age=18,60

									          filters:

									            - StripPrefix=1

路由断言工厂配置类

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									import lombok.Data;

									import lombok.NoArgsConstructor;

									import org.apache.commons.lang3.StringUtils;

									import org.springframework.cloud.gateway.handler.predicate.AbstractRoutePredicateFactory;

									import org.springframework.stereotype.Component;

									import org.springframework.web.server.ServerWebExchange;

									import java.util.Arrays;

									import java.util.List;

									import java.util.function.Predicate;

									//这是一个自定义的路由断言工厂类,要求有两个

									//1 名字必须是 配置+RoutePredicateFactory

									//2 必须继承AbstractRoutePredicateFactory<配置类>

									@Component

									public class AgeRoutePredicateFactory extends AbstractRoutePredicateFactory<AgeRoutePredicateFactory.Config> {

									    //构造函数

									    public AgeRoutePredicateFactory() {

									        super(Config.class);

									    }

									    //读取配置文件的中参数值 给他赋值到配置类中的属性上

									    public List<String> shortcutFieldOrder() {

									        //这个位置的顺序必须跟配置文件中的值的顺序对应

									        return Arrays.asList("minAge", "maxAge");

									    }

									    //断言逻辑

									    public Predicate<ServerWebExchange> apply(Config config) {

									        return new Predicate<ServerWebExchange>() {

									            @Override

									            public boolean test(ServerWebExchange serverWebExchange) {

									                //1 接收前台传入的age参数

									                String ageStr = serverWebExchange.getRequest().getQueryParams().getFirst("age");

									                //2 先判断是否为空

									                if (StringUtils.isNotEmpty(ageStr)) {

									                    //3 如果不为空,再进行路由逻辑判断

									                    int age = Integer.parseInt(ageStr);

									                    if (age < config.getMaxAge() && age > config.getMinAge()) {

									                        return true;

									                    } else {

									                        return false;

									                    }

									                }

									                return false;

									            }

									        };

									    }

									    //配置类,用于接收配置文件中的对应参数

									    @Data

									    @NoArgsConstructor

									    public static class Config {

									        private int minAge;//18

									        private int maxAge;//60

									    }

									}