SpringCloud 实战十九：常见的predicate

1、创建测试类获取中国当前时间

import java.time.ZonedDateTime;

public class T2 {
    public static void main(String[] args) {
        ZonedDateTime zbj = ZonedDateTime.now();
        System.out.println(zbj);
    }
}

得到上海时间：2020-09-19T21:50:08.857+08:00[Asia/Shanghai]

2、配置在特定时间之后路由才有效

server:
  port: 9527

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: payment_routh # payment_route  路由的ID,没有固定的规则但要求唯一
#          uri: http://localhost:8001        #匹配后提供服务的路径地址
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
            - Path=/payment/get/**          #断言，路径相匹配进行路由

        - id: payment_routh2 # payment_route
#          uri: http://localhost:8001
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
              - Path=/payment/lb/**
              - After=2020-09-19T21:55:08.857+08:00[Asia/Shanghai]
eureka:
  instance:
    hostname: cloud-gateway-service
  client:
    # 将自己注册进eureka中心
    register-with-eureka: true
    # 是否抓取注册信息，默认为true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka

3、访问：http://localhost:9527/payment/lb

返回了404，因为时间还没到就不会开放

过了时间，恢复正常访问

除了After，还有很多其他的如Before、Between等

携带特定cookie才可访问：

配置cookie的predicate

server:
  port: 9527

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: payment_routh # payment_route  路由的ID,没有固定的规则但要求唯一
#          uri: http://localhost:8001        #匹配后提供服务的路径地址
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
            - Path=/payment/get/**          #断言，路径相匹配进行路由

        - id: payment_routh2 # payment_route
#          uri: http://localhost:8001
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
              - Path=/payment/lb/**
              - After=2020-09-19T21:55:08.857+08:00[Asia/Shanghai]  # 这个时间之后才能访问
              - Cookie=username,zzyy  # 携带这个cookie才能访问
eureka:
  instance:
    hostname: cloud-gateway-service
  client:
    # 将自己注册进eureka中心
    register-with-eureka: true
    # 是否抓取注册信息，默认为true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka

携带特定请求头才可访问：

配置header的predicate

server:
  port: 9527

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: payment_routh # payment_route  路由的ID,没有固定的规则但要求唯一
#          uri: http://localhost:8001        #匹配后提供服务的路径地址
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
            - Path=/payment/get/**          #断言，路径相匹配进行路由

        - id: payment_routh2 # payment_route
#          uri: http://localhost:8001
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
              - Path=/payment/lb/**
              - After=2020-09-19T21:55:08.857+08:00[Asia/Shanghai]  # 这个时间之后才能访问
              - Hearder=X-Request-Id, \d+  # 请求头携带这个参数且正则匹配为整数才可访问
eureka:
  instance:
    hostname: cloud-gateway-service
  client:
    # 将自己注册进eureka中心
    register-with-eureka: true
    # 是否抓取注册信息，默认为true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka

GET请求方式才可访问：

配置method的predicate

server:
  port: 9527

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: payment_routh # payment_route  路由的ID,没有固定的规则但要求唯一
#          uri: http://localhost:8001        #匹配后提供服务的路径地址
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
            - Path=/payment/get/**          #断言，路径相匹配进行路由

        - id: payment_routh2 # payment_route
#          uri: http://localhost:8001
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
              - Path=/payment/lb/**
              - After=2020-09-19T21:55:08.857+08:00[Asia/Shanghai]  # 这个时间之后才能访问
              - Method=GET
eureka:
  instance:
    hostname: cloud-gateway-service
  client:
    # 将自己注册进eureka中心
    register-with-eureka: true
    # 是否抓取注册信息，默认为true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka

带参数的Get请求才能访问：

配置query的predicate

这里带上参数username且值为整数的GET请求才能访问

curl  get   http://localhost:9527/payment/lb?useranme=1

server:
  port: 9527

spring:
  application:
    name: cloud-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: payment_routh # payment_route  路由的ID,没有固定的规则但要求唯一
#          uri: http://localhost:8001        #匹配后提供服务的路径地址
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
            - Path=/payment/get/**          #断言，路径相匹配进行路由

        - id: payment_routh2 # payment_route
#          uri: http://localhost:8001
          uri: lb://cloud-payment-service    #匹配后提供服务的路由地址
          predicates:
              - Path=/payment/lb/**
             - Method=GET
              - Query=username,\d+
eureka:
  instance:
    hostname: cloud-gateway-service
  client:
    # 将自己注册进eureka中心
    register-with-eureka: true
    # 是否抓取注册信息，默认为true
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka