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Springcloud之Gateway网关

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Springcloud-Gateway网关

[SpringCloud]  gateway 通过微服务名实现动态路由

官网:https://docs.spring.io/spring-cloud-gateway/docs/current/reference/html

image-20220120141122797

一.gateway项目搭建

  1. 导入依赖

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

    gateway不能导入spring-boot-starter-web依赖,否则会报如下错误org.springframework.http.codec.ServerCodecConfigurer‘ that could not be found,因为spring cloud gateway是基于webflux的,如果非要web支持的话需要导入spring-boot-starter-webflux而不是spring-boot-start-web。

    image-20220120112134011

  2. 添加配置

    image-20220120135821358

    eureka:
      client:
        register-with-eureka: true
        fetch-registry: true
        service-url:
          defaultZone: http://localhost:7001/eureka #需要将网关注入到注册中心
    spring:
      cloud:
        gateway:
          enabled: true
          routes:
            - id: payment_routh
              uri: CLOUD-PAYMENT-SERVICE
              predicates:
                - Path=/payment/**            
    
  3. 验证

    payment服务提供者自测: http://localhost:8001/payment/1

    image-20220120142019550

    通过gateway网关访问payment服务 http://localhost:7529/payment/1

    image-20220120142109951

二. 网关动态路由

之前我们做负载均衡的时候,是通过Ribbon进行,但是现在我们对8001和8002做了网关,那么就需要通过geteway的动态路由实现调用服务

修改application.yml配置文件

spring:
  cloud:
    gateway:
      enabled: true
      discovery:
        locator:
          enabled: true #开启从注册中心动态创建路由的功能,利用微服务名进行路由
      routes:
        - id: payment_routh
          uri: lb://CLOUD-PAYMENT-SERVICE #uri的协议为lb,表示启用gateway网关的负载均衡功能
          predicates:
            - Path=/payment/**

注意:uri 需要使用lb://不然不会开启负载均衡的功能

三.Gateway常用的predicates

从官方文档可以看到predicate有11种,具体的见官方文档

image-20220120152343095

四.Gateway的Filter过滤器

路由过滤器允许以某种方式修改传入的 HTTP 请求或传出的 HTTP 响应。路由过滤器的范围是特定的路由。Spring Cloud Gateway 包含31种内置的 GatewayFilter ,具体的详见官方文档:https://docs.spring.io/spring-cloud-gateway/docs/current/reference/html/#gatewayfilter-factories

image-20220120170217939

最重要的是使用自定义全局GlobalFilter

创建一个全局的gatewayFilter类并实现接口GlobalFilter和Ordered

@Component
@Slf4j
public class MyLogGatewayFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        log.info("*************come in MyLogGatewayFilter ");

        String userName = exchange.getRequest().getQueryParams().getFirst("userName");
        if(userName == null)
        {
            log.info("用户名为null,非法用户");
            exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

测试:

image-20220120172104013

有userName的参数进行测试

image-20220120172218177

标签:网关,Springcloud,payment,Gateway,路由,spring,gateway,cloud
来源: https://www.cnblogs.com/seanRay/p/15828964.html