net core Ocelot 网关初使用（1）

忘是亡心i 2022-10-02 04:46 153阅读 0赞

## 新建 net core webapi 项目 ##

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![项目文件][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppZWdlbWVuYQ_size_16_color_FFFFFF_t_70]

## 安装 nuget 包 ##

--------------------

```
    
    Install-Package Ocelot
    
    ```

## 配置 ##

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*  添加一个Ocelot.json的文件用来添加Ocelot的配置
 *  转发 [http://localhost:53743/jsmer][http_localhost_53743_jsmer] => [http://localhost:8088][http_localhost_8088]
    
        {
        "GlobalConfiguration": {
            "BaseUrl": "http://localhost:53743"
        },
        "ReRoutes": [
            {
            "DownstreamPathTemplate": "/{postId}",
            "DownstreamScheme": "http",
            "DownstreamHostAndPorts": [
                {
                "Host": "localhost",
                "Port": 8088
                }
            ],
            "UpstreamPathTemplate": "/jsmer/{postId}",
            "UpstreamHttpMethod": [ "Get" ]
            }
        ]
        }
 *  说明
    
    > Downstream是下游服务配置  
    > UpStream是上游服务配置  
    > Aggregates 服务聚合配置  
    > ServiceName, LoadBalancer, UseServiceDiscovery 配置服务发现  
    > AuthenticationOptions 配置服务认证  
    > RouteClaimsRequirement 配置Claims鉴权  
    > RateLimitOptions为限流配置  
    > FileCacheOptions 缓存配置  
    > QosOptions 服务质量与熔断  
    > DownstreamHeaderTransform头信息转发

## 添加中间件 ##

--------------------

#### Startup.cs ####

1.  代码如下

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore.Builder;
    using Microsoft.AspNetCore.Hosting;
    using Microsoft.AspNetCore.Mvc;
    using Microsoft.Extensions.Configuration;
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Logging;
    using Microsoft.Extensions.Options;
    // 添加
    using Ocelot.DependencyInjection;
    // 添加
    using Ocelot.Middleware;
    
    namespace JSClound.Gateway
    {
        public class Startup
        {
            public Startup(IConfiguration configuration)
            {
                Configuration = configuration;
            }
    
            public IConfiguration Configuration { get; }
    
            // This method gets called by the runtime. Use this method to add services to the container.
            public void ConfigureServices(IServiceCollection services)
            {
           		 // 添加
                services.AddOcelot();
                
                services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
            }
    
            // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
            public void Configure(IApplicationBuilder app, IHostingEnvironment env)
            {
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                }
    
                app.UseMvc();
    			// 添加
                app.UseOcelot().Wait();
            }
        }
    }
     }

#### Program.cs ####

using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore;
    using Microsoft.AspNetCore.Hosting;
    using Microsoft.Extensions.Configuration;
    using Microsoft.Extensions.Logging;
    
    namespace JSClound.Gateway
    {
        public class Program
        {
            public static void Main(string[] args)
            {
                BuildWebHost(args).Run();
            }
    
            //public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            //    WebHost.CreateDefaultBuilder(args)
            //        .UseStartup<Startup>();
            public static IWebHost BuildWebHost(string[] args) => WebHost.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((hostingContext, builder) =>
                 {
                    builder
                    .SetBasePath(hostingContext.HostingEnvironment.ContentRootPath)
                    .AddJsonFile("Ocelot.json");
                 })
                 .UseStartup<Startup>()
                 .Build();
        }
    }

## 效果 ##

--------------------

*  [http://localhost:8088][http_localhost_8088]

> ![在这里插入图片描述][20190617091627481.png]

*  [http://localhost:53743/jsmer][http_localhost_53743_jsmer]

> ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppZWdlbWVuYQ_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppZWdlbWVuYQ_size_16_color_FFFFFF_t_70]: /images/20220113/8eca57d7df004a5d8ff53c57334d1f8e.png
[http_localhost_53743_jsmer]: http://localhost:53743/jsmer
[http_localhost_8088]: http://localhost:8088
[20190617091627481.png]: /images/20220113/ece53fa68f234234a125ec44e40b9b8d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppZWdlbWVuYQ_size_16_color_FFFFFF_t_70 1]: /images/20220113/d4264ad707f94950b1f81d7f8dcc0309.png