springcloud-gateway实现

Route （路由）： 路由是构建网关的基本模块，它由 ID，目标 URI，一系列的断言和过滤器组成，如果断言为true则匹配该路由
Predicate（断言）：参考的是 java8 的 java.util.function.Predicate 开发人员可以匹配 HTTP 请求中的所有内容（例如请求头或请求参数），如果请求与断言相匹配则进行路由
Filter（过滤）：指的是 Spring 框架中 GatewayFilter 的实例，使用过滤器，可以在请求被路由前或者之后对请求进行修改

pom文件

    4.0.0
    
        spring-cloud-demo
        com.xx.job
        1.0-SNAPSHOT
    

    cloud-gateway-gateway9527

    
        1.8
    

    
        
            junit
            junit
            4.11
        
        
            mysql
            mysql-connector-java
        
        
            com.alibaba
            druid
        
        
            org.projectlombok
            lombok
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-hystrix
        
      
            org.springframework.cloud
            spring-cloud-starter-gateway
        
        
            io.projectreactor.netty
            reactor-netty
            0.9.14.RELEASE
        

    

yml文件

server:
  port: 9527

spring:
  application:
    name: cloud-gateway-gateway9527
  cloud:
    gateway:
      routes:
        - id: payment8001
          uri: lb://SPRING-CLOUD-PAYMENT
          predicates:
            - Path=/payment/selectById/**

eureka:
  instance:
    instance-id: cloud-gateway-gateway9527
  client:
    #表示是否将自己注册进EurekaServer，默认为true
    register-with-eureka: true
    # 是否从EurekaServer抓取已有的注册信息，默认为毛白前，单节点无所谓，集群必须设置为true,才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka

主启动类

package com.xx.job.cloudgatewaygateway9527;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
@EnableDiscoveryClient
public class CloudGatewayGateway9527Application {

    public static void main(String[] args) {
        SpringApplication.run(CloudGatewayGateway9527Application.class, args);
    }

}

 gateway的两种配置方式

方式一：上面的yml配置方式

方式二：java类配置

package com.xx.job.cloudgatewaygateway9527.config;

import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class GatewayConfig {


    @Bean
    public RouteLocator routeLocator(RouteLocatorBuilder routeLocatorBuilder){
        RouteLocatorBuilder.Builder routes = routeLocatorBuilder.routes();
        RouteLocator build = routes.route("payment8001", r -> r.path("/payment/selectById/**").uri("lb://SPRING-CLOUD-PAYMENT"))
               // .route("payment8002", r -> r.path("/payment/get/**").uri("http://127.0.0.1:8002"))
                .build();
        return build;
    }
}

git：spring-cloud-demo: spring-cloud-demo试例