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zuul 简单使用功能之请求转发和负载均衡

  • spring-cloud-eureka-server Eureka 服务端，server.port=8100
  • spring-cloud-eureka-client-provider-demo Eureka 服务提供者1，server.port=8200
  • spring-cloud-eureka-client-provider2-demo Eureka 服务提供者2，server.port=8201
  • spring-cloud-zuul-simple zuul 通过 url 映射方式来实现转发功能，server.port=8555
  • spring-cloud-zuul-simple-eureka 将 zuul 注册到 Eureka 上实现转发功能，server.port=8555

测试重定向功能

  1. 启动 spring-cloud-zuul-simple
  2. 访问 http://localhost:8555/zq

测试请求转发功能

  1. 启动 spring-cloud-zuul-simple、spring-cloud-eureka-server、 spring-cloud-eureka-client-provider-demo
  2. 访问 http://localhost:8555/hello/hello?name=zuul

测试Zuul 注册到 eureka 来进行接口转发并做了负载均衡

  1. 启动
spring-cloud-eureka-server；server.port=8100
spring-cloud-eureka-client-provider-demo；server.port=8200
spring-cloud-eureka-client-provider2-demo；server.port=8201
spring-cloud-zuul-simple-eureka；server.port=8555

2.访问 http://localhost:8555/service-provider1/hello?name=zull

Zuul的路由规则如下：http://ZUUL_HOST:ZUUL_PORT/微服务在Eureka上的serviceId/** 会被转发到serviceId对应的微服务。

zuul 高级使用功能之Filter、路由熔断、路由重试

  • spring-cloud-zuul-advanced，server.port=8555
  • spring-cloud-eureka-server Eureka 服务端，server.port=8100
  • spring-cloud-eureka-client-provider-demo Eureka 服务提供者1，server.port=8200
  • spring-cloud-eureka-client-provider2-demo Eureka 服务提供者2，server.port=8201

测试 Filter 功能

  1. 启动
spring-cloud-eureka-server，server.port=8100
spring-cloud-eureka-client-provider-demo，server.port=8200
spring-cloud-zuul-advanced，server.port=8555

2.访问 http://localhost:8555/service-provider1/hello?name=zull 请求被拦截返回

3.访问 http://localhost:8555/service-provider1/hello?name=zull&token=xx 请求正常响应

测试路由熔断功能

  1. 启动
spring-cloud-eureka-server；server.port=8100
spring-cloud-eureka-client-provider-demo；server.port=8200
spring-cloud-eureka-client-provider2-demo；server.port=8201 
spring-cloud-zuul-advanced；server.port=8555

2.多次访问 http://localhost:8555/service-provider1/hello?name=zull&token=xx
3.停止 spring-cloud-eureka-client-provider2-demo 服务，多次再访问 http://localhost:8555/service-provider1/hello?name=zull&token=xx 可以看到 spring-cloud-eureka-client-provider2-demo 已经启用了熔断

注意：实例down掉后，是被Eureka抛弃了，所以Zuul不会再去找他

测试路由重试功能

文件 spring-cloud-study/spring-cloud-eureka-client-provider2-demo/src/main/java/com/zq/controller/HelloController.java 打开注释

@RequestMapping("/hello")
public String index(@RequestParam String name) {
    logger.info("request two message is " + name);
    try {
        Thread.sleep(1000000);
    } catch (Exception e) {
        logger.error("hello two error", e);
    }
    return "hello " + name + "，this is producer2 first message";
}
  1. 启动
spring-cloud-eureka-server、
spring-cloud-eureka-client-provider-demo、
spring-cloud-eureka-client-provider2-demo、
spring-cloud-zuul-advanced

2.多次访问 http://localhost:8555/service-provider1/hello?name=zull&token=xx 当出现 The service is unavailable. 时观察后台日志

2021-11-01 19:12:35.026  INFO 47131 --- [nio-8200-exec-4] c.f.jackson.core.filter.TokenFilter      : request two message is zull
2021-11-01 19:12:36.030  INFO 47131 --- [nio-8200-exec-5] c.f.jackson.core.filter.TokenFilter      : request two message is zull
2021-11-01 19:12:37.035  INFO 47131 --- [nio-8200-exec-6] c.f.jackson.core.filter.TokenFilter      : request two message is zull

说明进行了三次的请求，也就是进行了两次的重试请求