.net core+Spring Cloud学习之路二

程序员文章站 2022-04-08 21:34:39

前言：原本计划这次写一下搭建eureka群集。但是发现上次写的只是服务的注册，忘了写服务的发现，所以这次先把服务发现补上去。需要using Pivotal.Discovery.Client; 这个时候发现名为order的有两个服务。然后再次启动这三个.net core项目，并访问http:// ......

　　前言：

　　原本计划这次写一下搭建eureka群集。但是发现上次写的只是服务的注册，忘了写服务的发现，所以这次先把服务发现补上去。

　　我们基于上篇文章，再新建两个.net core web api项目，分别起名为order_one,order_two, 作为两个订单服务。我们以order_one为例。

同理先使用nuget添加pivotal.discovery.clientcore库。

startup.cs 中添加

1 public void configureservices(iservicecollection services)
2         {
3             // services.adddiscoveryclient(configuration);
4             services.adddiscoveryclient(configuration);
5             services.addmvc().setcompatibilityversion(compatibilityversion.version_2_1);
6         }

 1 public void configure(iapplicationbuilder app, ihostingenvironment env,iloggerfactory loggerfactory)
 2         {
 3             loggerfactory.addconsole(configuration.getsection("logging"));
 4             loggerfactory.adddebug();
 5             if (env.isdevelopment())
 6             {
 7                 app.usedeveloperexceptionpage();
 8             }
 9             else
10             {
11                 app.usehsts();
12             }
13             app.usediscoveryclient();
14             app.usehttpsredirection();
15             app.usemvc();
16         }

需要using pivotal.discovery.client;

appsettings.json 添加eureka服务配置

{
  "logging": {
    "includescopes": false,
    "debug": {
      "loglevel": {
        "default": "warning"
      }
    },
    "console": {
      "loglevel": {
        "default": "warning"
      }
    }
  },
  "spring": {
    "application": {
      "name": "order"
    }
  },
  "eureka": {
    "client": {
      "serviceurl": "http://localhost:8888/eureka/",
      "shouldfetchregistry": true
    },
    "instance": {
      "port": 5001,
      "hostname": "localhost"
    }
  }
}

修改launchsettings.json 端口改为5001

{
  "iissettings": {
    "windowsauthentication": false,
    "anonymousauthentication": true,
    "iisexpress": {
      "applicationurl": "http://localhost:5001/",
      "sslport": 0
    }
  },
  "profiles": {
    "iis express": {
      "commandname": "iisexpress",
      "launchbrowser": true,
      "launchurl": "api/values",
      "environmentvariables": {
        "aspnetcore_environment": "development"
      }
    },
    "order_one": {
      "commandname": "project",
      "launchbrowser": true,
      "launchurl": "api/order",
      "environmentvariables": {
        "aspnetcore_environment": "development"
      },
      "applicationurl": "http://localhost:5001/"
    }
  }
}

添加一个控制器，返回order one

[route("api")]
    public class valuescontroller : controller
    {


        // get api/values
        [httpget("value")]
        public string get()
        {
            return "order one";
        }
    }

再建一个同样的项目，order_two

上述项目创建完成后，我们先启动spring cloud项目。然后同时启动三个.net core项目。这个时候我们刷新一下spring cloud页面。
这个时候发现名为order的有两个服务。

修改一下orderserver的控制器代码

[route("api")]
    public class valuescontroller : controller
    {

        discoveryhttpclienthandler _handler;

       

        private const string get_services_url = "http://order/api/value";
        private ilogger<valuescontroller> _logger;


        public valuescontroller(idiscoveryclient client, iloggerfactory logfactory = null)
        {
            _handler = new discoveryhttpclienthandler(client);
            _logger = logfactory?.createlogger<valuescontroller>();
        }

        [httpget("order")]
        public async task<string> getservices()
        {
            _logger?.loginformation("getservices");
            var client = getclient();
            return await client.getstringasync(get_services_url);

        }

        private httpclient getclient()
        {
            var client = new httpclient(_handler, false);
            return client;
        }

    }

然后再次启动这三个.net core项目，并访问http://localhost:5000/api/order，如图，他成功返回了order two，多刷新几次会发现返回的order one 和 order two是来回变的。 .net core+Spring Cloud学习之路二