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简介

同zuul一样，为网关组件，zuul已停更，建议使用gateway代替之；

参考文章： SpringCloud极简入门＞网关#zuul

实战

1、创建《gateway》模块

1.1、pom依赖

<dependencies>
	<!--gateaway依赖-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
</dependencies>

1.2、yml配置

server:
  port: 8063

eureka:
  client:
    service-url:
      defaultZone: http://localhost:7000/eureka/

#配好后访问http://localhost:8063/account就能获取server-account服务的数据
spring:
  application:
    name: gateway
  cloud:
    gateway:
      #网关路由
      routes:
        #服务
        - id: server-account
          #提供服务的路由地址=>静态|动态
          #uri: http://localhost:7101
          #动态从eureka服务中心获取服务
          uri: lb://SERVER-ACCOUNT

          #断言条件
          predicates:
            #路径匹配
            - Path=/**
            #请求方法
            - Method=GET

          filters:
            #添加请求头h1=h2
            - AddRequestHeader=h1,h2
            #添加请求参数p1=p2
            - AddRequestParameter=p1,p2

1.3、application声明eureka client注解

1.4、测试访问http://localhost:8063/account

1.5、可以配置全局过滤器GlobalFilter，参考示例

@Component
public class CustomGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        System.out.println("进入" + CustomGlobalFilter.class.getSimpleName());
        String p1 = exchange.getRequest().getQueryParams().getFirst("p1");
        String p2 = exchange.getRequest().getQueryParams().getFirst("p2");
        System.out.println("p1:" + p1 + ", p2:" + p2);
        if (p1 == null) {
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;//过滤器的顺序，数值越小越先执行
    }
}