统一网关Gateway

统一网关Gateway

为什么需要网关

搭建网关服务

    
        <dependency>
            <groupId>com.alibaba.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
        dependency>
    
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-gatewayartifactId>
        dependency>

server:
  port: 10010
spring:
  application:
    name: gateway
  cloud:
    nacos:
      server-addr: localhost:8848 # nacos地址
    gateway:
      routes:
        - id: user-service   # 路由表示，必须唯一
          uri: lb://userService # 路由的目标地址
          predicates:  # 路由断言，判断请求是否符合规则
            - Path=/user/** # 路径断言，判断路径是否是以/user开头，如果是则符合
        - id: order-service
          uri: lb://orderServcie
          predicates:
            - Path=/order/**

路由断言工厂

路由过滤器

server:
  port: 10010
spring:
  application:
    name: gateway
  cloud:
    nacos:
      server-addr: localhost:8848 # nacos地址
    gateway:
      routes:
        - id: user-service   # 路由表示，必须唯一
          uri: lb://userService # 路由的目标地址
          predicates:  # 路由断言，判断请求是否符合规则
            - Path=/user/** # 路径断言，判断路径是否是以/user开头，如果是则符合
#          filters:
#            - AddRequestHeader=Truth,HB is freaking awesome!
        - id: order-service
          uri: lb://orderServcie
          predicates:
            - Path=/order/**
            - Before=2037-01-13T15:14:47.433+08:00[Asia/Shanghai]
      default-filters: # 默认过滤器，会对所有的路由请求都有效
        - AddRequestHeader=Truth,HB is freaking awesome!

全局过滤器

package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//@Order(-1)
@Component
public class AuthorizeFilter implements GlobalFilter , Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1. 获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> params = request.getQueryParams();

        // 2. 获取参数中的authorization参数
        String auth = params.getFirst("authorization");

        // 3. 判断参数是否都等于admin
        if("admin".equals(auth)){
            // 4. 是放行
            return chain.filter(exchange);
        }

        // 5. 拦截,设置状态码
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        return exchange.getResponse().setComplete();
    }

    @Override
    public int getOrder() {
        return -1;
    }
}

过滤器执行顺序

跨域问题处理

spring:
  cloud:
    gateway:
      globalcors: # 全局的跨域处理
        add-to-simple-url-handler-mapping: true # 解决options请求被拦截问题
        corsConfigurations:
          '[/**]':
            allowedOrigins: # 允许哪些网站的跨域请求
              - "http://localhost:8090"
              - "http://www.leyou.com"
            allowedMethods: # 允许的跨域ajax的请求方式
              - "GET"
              - "POST"
              - "DELETE"
              - "PUT"
              - "OPTIONS"
            allowedHeaders: "*" # 允许在请求中携带的头信息
            allowCredentials: true # 是否允许携带cookie
            maxAge: 360000 # 这次跨域检测的有效期