18.SpringCloud Gateway

简介

SpringCloud Gateway是spingcloud家族的产品，使用netty实现的高性能服务网关，用于替换netflix公司的zuul网关实现。

参考地址： https://spring.io/projects/spring-cloud

术语
工作原理
Route Predicate Factories

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GatewayFilter

示例

添加依赖配置

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

server:
  port: 9000

spring:
  application:
    name: svc-gateway
  cloud:
    nacos:
      discovery:
        server-addr: 175.178.191.230:8848
    gateway:
      routes:
        - id: svc-hotel-consume
          uri: lb://svc-hotel-consumer
          predicates:
            - Path=/hotel/**

自定义异常返回处理：

@Bean
@Order(Ordered.HIGHEST_PRECEDENCE)
public WebExceptionHandler exceptionHandler() {
    return new WebExceptionHandler() {
        @Override
        public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
            exchange.getResponse().getHeaders().set("Content-Type","application/json");
            Map map = new HashMap();
            map.put("status",400);
            map.put("msg",ex.getMessage());
            return exchange.getResponse().writeWith(Mono.just(exchange.getResponse().bufferFactory().wrap(JSON.toJSONString(map).getBytes())));
        }
    };
}

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