.NetCore简单封装基于IHttpClientFactory的HttpClient请求
IHttpClientFactory是什么？为什么出现了IHttpClientFactory
一、IHttpClientFactory是什么？
IHttpClientFactory是.netcore2.1才开始引入的，是HttpClient的工厂接口，它为我们提供了获取HttpClient的接口，它帮助我们维护HttpClient的生命周期。当我们需要HttpClient访问网络时，它会自动帮我们获取或者是创建HttpClient（存在空闲的HttpClient时，直接提供；当不存在可用的HttpClient时自动创建）。它相当于HttpClient池。
二、为什么出现IHttpClientFactory？
传统的HttpClient创建后，其占用了Socket资源并且其不会是及时的回收。我们每次new一个HttpClient时是一个全新的对象，所以在高并发下又是会导致socket资源耗尽（Unable to connect to the remote serverSystem.Net.Sockets.SocketException: Only one usage of each socket address (protocol/network address/port) is normally permitted.）。而如果采用单例或者静态的HttpClient，却达不到高效的使用网络请求，而且当访问不同的url时，单例或者静态的HttpClient往往会导致访问混乱而出现错误。
.NetCore简单封装基于IHttpClientFactory的HttpClient请求
1 public class HttpWebClient
2 {
3
4 private IHttpClientFactory _httpClientFactory;
5 private readonly ILogger<HttpWebClient> _logger;
6 public HttpWebClient(IHttpClientFactory httpClientFactory, ILogger<HttpWebClient> logger)
7 {
8 this._httpClientFactory = httpClientFactory;
9 this._logger = logger;
10 }
11
12 /// <summary>
13 /// Get
14 /// </summary>
15 /// <param name="url"></param>
16 /// <param name="dicHeaders"></param>
17 /// <param name="timeoutSecond"></param>
18 /// <returns></returns>
19 public async Task<T> GetAsync<T>(string url, Dictionary<string, string> dicHeaders, int timeoutSecond = 180)
20 {
21 try
22 {
23 var client = BuildHttpClient(dicHeaders, timeoutSecond);
24 var response = await client.GetAsync(url);
25 var responseContent = await response.Content.ReadAsStringAsync();
26 if (response.IsSuccessStatusCode)
27 {
28 return JsonUtil.Deserialize<T>(responseContent);
29 }
30 else
31 {
32 throw new CustomerHttpException(response.StatusCode.ToString(), responseContent);
33 }
34 }
35 catch (Exception ex)
36 {
37 _logger.LogError($"HttpGet:{url} Error:{ex.ToString()}");
38 throw new Exception($"HttpGet:{url} Error", ex);
39 }
40 }
41 /// <summary>
42 /// Post
43 /// </summary>
44 /// <param name="url"></param>
45 /// <param name="requestBody"></param>
46 /// <param name="dicHeaders"></param>
47 /// <param name="timeoutSecond"></param>
48 /// <returns></returns>
49 public async Task<T> PostAsync<T>(string url, string requestBody, Dictionary<string, string> dicHeaders, int timeoutSecond = 180)
50 {
51 try
52 {
53 var client = BuildHttpClient(null, timeoutSecond);
54 var requestContent = GenerateStringContent(requestBody, dicHeaders);
55 var response = await client.PostAsync(url, requestContent);
56 var responseContent = await response.Content.ReadAsStringAsync();
57 if (response.IsSuccessStatusCode)
58 {
59 var result = JsonUtil.Deserialize<T>(responseContent);
60 return result;
61 }
62 else
63 {
64 throw new CustomerHttpException(response.StatusCode.ToString(), responseContent);
65 }
66 }
67 catch (Exception ex)
68 {
69 _logger.LogError($"HttpPost:{url},body:{requestBody} Error:{ex.ToString()}");
70 throw new Exception($"HttpPost:{url} Error", ex);
71 }
72 }
73 /// <summary>
74 /// Put
75 /// </summary>
76 /// <param name="url"></param>
77 /// <param name="requestBody"></param>
78 /// <param name="dicHeaders"></param>
79 /// <param name="timeoutSecond"></param>
80 /// <returns></returns>