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在C#中,使用AJAX技術(shù)和HTTP/2服務(wù)器推送可以實(shí)現(xiàn)實(shí)時(shí)通信和更高效的數(shù)據(jù)傳輸。以下是一個(gè)簡(jiǎn)單的示例,展示了如何在ASP.NET Core應(yīng)用程序中實(shí)現(xiàn)HTTP/2服務(wù)器推送。
首先,確保已安裝.NET Core SDK 3.0或更高版本。
創(chuàng)建一個(gè)新的ASP.NET Core Web應(yīng)用程序:
dotnet new webapp -o Http2ServerPushDemo
cd Http2ServerPushDemo
Startup.cs
文件,啟用HTTP/2和服務(wù)器推送:using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http2;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace Http2ServerPushDemo
{
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddHttp2();
services.AddControllersWithViews();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
});
app.UseHttp2ServerPush(options =>
{
options.PushResources = (context, request, response) =>
{
if (response.StatusCode == StatusCodes.Status200OK && context.Request.Path.Value.Contains("home"))
{
context.Response.Headers["Link"] = "</css/site.css>; rel=preload; as=style";
}
};
});
}
}
}
Views/Home/Index.cshtml
文件中添加一個(gè)AJAX請(qǐng)求,以便在不刷新頁(yè)面的情況下從服務(wù)器獲取數(shù)據(jù):@{
ViewData["Title"] = "Home Page";
}
<div id="message"></div><script src="https://code.jquery.com/jquery-3.6.0.min.js"></script><script>
$(document).ready(function () {
setInterval(function () {
$.ajax({
url: '/api/data',
type: 'GET',
dataType: 'json',
success: function (data) {
$('#message').text(data.message);
},
error: function (error) {
console.log(error);
}
});
}, 1000);
});
</script>
dotnet new controller -n ApiController
ApiController.cs
文件,添加一個(gè)返回JSON數(shù)據(jù)的API端點(diǎn):using System;
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("api/[controller]")]
public class ApiController : ControllerBase
{
[HttpGet("data")]
public IActionResult GetData()
{
return Ok(new { message = $"Current time: {DateTime.Now}" });
}
}
dotnet run
現(xiàn)在,當(dāng)你訪問(wèn)應(yīng)用程序的主頁(yè)時(shí),瀏覽器將每秒發(fā)送一個(gè)AJAX請(qǐng)求,從服務(wù)器獲取當(dāng)前時(shí)間并顯示在頁(yè)面上。同時(shí),HTTP/2服務(wù)器推送會(huì)預(yù)加載CSS文件,提高頁(yè)面加載速度。
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