Ocelot 新手上路

新手上路，老司机请多多包含！Ocelot 在博园里文章特别多，但是按照其中一篇文章教程，如果经验很少或者小白，是没法将程序跑向博主的结果.

因此总结下参考多篇文章，终于达到预期效果。

Ocelot 目标是使用.NET运行微服务/面向服务架构，我们需要一个统一的入口进入我们的服务，提供监控、鉴权、负载均衡等机制，也可以通过编写中间件的形式，来扩展Ocelot的功能。 Ocelot是一堆特定顺序的中间件。

Ocelot开源地址：https://github.com/TomPallister/Ocelot

分别创建三个API

1.ApiGateway

2.WebApiA

3.WebApiB

以 APIGateway 项目 Nuget控制台，执行Ocelot安装。

PM>Install-Package Ocelot 按回车等待安装

如果看到这种情况恭喜你环境基本就绪咱们开始走上编码

1、APIGateway修改Startup

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)
{

services.AddMvc();
services.AddOcelot(new ConfigurationBuilder()
.AddJsonFile("configuration.json")
.Build());

}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public async void Configure(IApplicationBuilder app, IHostingEnvironment env)
{

if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}

await app.UseOcelot();

app.UseMvc();

}

添加命名空间

using Ocelot.DependencyInjection;
using Ocelot.Middleware;

3.ocelot.json 添加json

配置如下：

{
"ReRoutes": [
{
"DownstreamPathTemplate": "/api/values",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": "localhost",
"Port": 5001
}
],
"UpstreamPathTemplate": "/webapia/values",
"UpstreamHttpMethod": [ "Get" ]
},
{
"DownstreamPathTemplate": "/api/values",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": "localhost",
"Port": 5002
}
],
"UpstreamPathTemplate": "/webapib/values",
"UpstreamHttpMethod": [ "Get" ]
}
]
}