Ajax【原创-算法-实现】异步HTTP请求操作

一、说明

  1) 这个类 是自个儿 在真项目蒙,优化解决真正问题
时,不参照第三正值代码,完全是因为友好查阅MSDN官方文档 ,
完成的一个忠实生产环境被利用的意义相近

  2) 读者以采取此类时,请珍惜原创,在代码中长原创注释://  Author —
Meng.NET (cnblogs.com)  ,同时欢迎 二差改善、二次创作 以共同进步

  3)
此代码以【面向对象】、【C#闭包】、【异步回调】、【超时】、【等待】、【自动重试】方式贯彻与完成,且可以配备扩展

二、代码

  废话不多说,上干货,代码如下:

Ajax 1Ajax 2

  1     /// <summary>
  2     /// 异步 Http
  3     /// </summary>
  4     public class Remoter
  5     {
  6         /*
  7          * LM,2016/08/18
  8          * C#闭包化,异步化,Web操作
  9          * 以便支持POS多接口多操作同时使用
 10          */
 11 
 12         /// <summary>
 13         /// 请求地址
 14         /// </summary>
 15         public string URL { get; set; }
 16 
 17         /// <summary>
 18         /// 请求方式
 19         /// </summary>
 20         public string RequestMethod { get; set; }
 21 
 22         /// <summary>
 23         /// 请求数据
 24         /// </summary>
 25         public string JsonContent { get; set; }
 26 
 27         //
 28         private byte[] Buffer { get; set; }        
 29         private Stream RequestStream { get; set; }        
 30         private HttpWebRequest Request { get; set; }        
 31         private bool ResponseFlag { get; set; }        
 32         private string Result { get; set; }        
 33         private bool TimeoutFlag  { get; set; }        
 34         private int TimeoutTime { get; set; }        
 35         private bool RetryFlag { get; set; }        
 36         private int RetryCount  { get; set; }        
 37         private int WaitSleep { get; set; }        
 38         private int TrySleep { get; set; }
 39 
 40         // 初始化
 41         public Remoter()
 42         {
 43             //
 44             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Ssl3;
 45             ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback((object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) => true);
 46 
 47             // 
 48             this.URL = string.Empty;
 49             this.Request = default(HttpWebRequest);
 50             this.JsonContent = string.Empty;
 51             this.Buffer = default(byte[]);
 52             this.RequestStream = default(Stream);
 53             this.ResponseFlag = false;
 54             this.Result = string.Empty;
 55             this.TimeoutFlag = false;
 56             this.TimeoutTime = 10 * 1000;
 57             this.RetryFlag = false;
 58             this.RetryCount = 3;
 59             this.WaitSleep = 10;
 60             this.RequestMethod = "POST";
 61             this.TrySleep = 2000;
 62         }
 63         
 64         /// <summary>
 65         /// 获取响应数据
 66         /// </summary>
 67         public string GetRemoteData()
 68         {
 69             //
 70             if(string.IsNullOrWhiteSpace(this.URL))
 71             {
 72                 throw new Exception("HttpAsync.URL,未赋值!");
 73             }
 74 
 75             // 
 76             RemoteNew(SetResult); 
 77 
 78             //
 79             var timeNum = 0;
 80             while (true)
 81             {
 82                 if (ResponseFlag)
 83                 {
 84                     break;
 85                 }
 86                 if (TimeoutFlag)
 87                 {
 88                     throw new Exception(string.Format("请求超时!超时时间:{0}S", TimeoutTime / 1000));
 89                 }
 90                 timeNum += WaitSleep;
 91                 if (timeNum >= TimeoutTime)
 92                 {
 93                     TimeoutFlag = true;
 94                 }
 95                 Thread.Sleep(WaitSleep);
 96             }
 97 
 98             //
 99             return Result;
100         }
101 
102         // 
103         private void RemoteNew(Action<Remoter, string> action) 
104         {
105             //
106             var reNum = 0;
107             for (var i = 0; i < this.RetryCount; i++)
108             {
109                 try
110                 {
111                     //
112                     var uri = URL;
113 
114                     //
115                     this.Request = WebRequest.Create(uri) as HttpWebRequest;
116                     this.Request.KeepAlive = false;
117                     this.Request.Method = this.RequestMethod;
118                     this.Request.Credentials = CredentialCache.DefaultCredentials;
119                     if (this.RequestMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
120                     {
121                         this.Buffer = Encoding.UTF8.GetBytes(this.JsonContent);
122                         this.Request.ContentLength = this.Buffer.Length;
123                         this.Request.ContentType = "application/json";
124                         this.RequestStream = this.Request.GetRequestStream();
125                         this.RequestStream.Write(this.Buffer, 0, this.Buffer.Length);
126                         this.RequestStream.Close();
127                     }
128 
129                     //
130                     this.Request.BeginGetResponse((arr) =>
131                     {
132                         //
133                         var state = arr.AsyncState as Remoter;
134                         //
135                         var response = state.Request.EndGetResponse(arr) as HttpWebResponse;
136                         var respStream = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("UTF-8"));
137                         action(state, respStream.ReadToEnd());
138                         respStream.Close();
139                         response.Close();
140                     }, this);
141                     //
142                     break;
143                 }
144                 catch (Exception ex)
145                 {
146                     Thread.Sleep(this.TrySleep);
147                     reNum++;
148                     if (reNum == this.RetryCount)
149                     {
150                         throw new Exception(string.Format("重试失败!重试次数:{0}次,失败原因:{1}", this.RetryCount, ex.Message));
151                     }
152                     continue;
153                 }
154             }
155         }        
156         private void SetResult(Remoter state, string jsonData)
157         {
158             if (!string.IsNullOrWhiteSpace(jsonData))
159             {
160                 state.Result = jsonData;
161                 state.ResponseFlag = true;
162             }
163         }
164     }

Remoter.cs

  使用办法:

  GET: 

Ajax 3Ajax 4

1 var remoter = new Remoter();
2 remoter.RequestMethod = "GET";
3 remoter.URL = "这里是你要请求的URL";
4 var response = remoter.GetRemoteData();

View Code

  POST:

Ajax 5Ajax 6

1 var remoter = new Remoter();
2 remoter.RequestMethod = "POST";
3 remoter.URL = "你要请求的URL";
4 remoter.JsonContent = "你要想URL发送的JSON数据";
5 var response = remoter.GetRemoteData();

View Code

老三、代码解析

    public Remoter()
初始化本类,可安排到 App.config/Web.config 中

Ajax 7Ajax 8

 1             // 
 2             this.URL = string.Empty;
 3             this.Request = default(HttpWebRequest);
 4             this.JsonContent = string.Empty;
 5             this.Buffer = default(byte[]);
 6             this.RequestStream = default(Stream);
 7             this.ResponseFlag = false;
 8             this.Result = string.Empty;
 9             this.TimeoutFlag = false;
10             this.TimeoutTime = 10 * 1000;
11             this.RetryFlag = false;
12             this.RetryCount = 3;
13             this.WaitSleep = 10;
14             this.RequestMethod = "POST";
15             this.TrySleep = 2000;

而从部署文件读取部分

  public string URL
要告的地方

  public string
RequestMethod HTTP 动词

  public string
JsonContent POST 请求时,发送的json数据

  private byte[]
Buffer 设置请求流的byte数组

  private Stream
RequestStream 请求流

  private HttpWebRequest
Request HTTP请求对象

  private bool
ResponseFlag 与请求对应的应是否成功标识

  private string
Result 回调状态保持对象,保存应结果用

  private bool
TimeoutFlag 总超时时间是否过期标识

  private int
TimeoutTime 总超时时间(包含几糟糕重试),默认10s

  private int
RetryCount 总URL调用(失败)自动重试次数,默认3不成

  private int
WaitSleep 主线程,仿Ajax回调等待时,默认10ms

  private int TrySleep
每次要地址失败后,重试时间距离,默认2s

  public string
GetRemoteData()  解析:

Ajax 9Ajax 10

 1             //
 2             var timeNum = 0;
 3             while (true)
 4             {
 5                 if (ResponseFlag)
 6                 {
 7                     break;
 8                 }
 9                 if (TimeoutFlag)
10                 {
11                     throw new Exception(string.Format("请求超时!超时时间:{0}S", TimeoutTime / 1000));
12                 }
13                 timeNum += WaitSleep;
14                 if (timeNum >= TimeoutTime)
15                 {
16                     TimeoutFlag = true;
17                 }
18                 Thread.Sleep(WaitSleep);
19             }

主线程,仿Ajax回调等待

  private void
RemoteNew(Action<Remoter, string> action) 解析:

Ajax 11Ajax 12

 1         private void RemoteNew(Action<Remoter, string> action) 
 2         {
 3             //
 4             var reNum = 0;
 5             for (var i = 0; i < this.RetryCount; i++)
 6             {
 7                 try
 8                 {
 9                     // 此处省略
10                     //... ...
11 
12                     //
13                     break;
14                 }
15                 catch (Exception ex)
16                 {
17                     Thread.Sleep(this.TrySleep);
18                     reNum++;
19                     if (reNum == this.RetryCount)
20                     {
21                         throw new Exception(string.Format("重试失败!重试次数:{0}次,失败原因:{1}", this.RetryCount, ex.Message));
22                     }
23                     continue;
24                 }
25             }
26         }                        

调用URL失败,自动重试机制

Ajax 13Ajax 14

 1                     //
 2                     this.Request.BeginGetResponse((arr) =>
 3                     {
 4                         //
 5                         var state = arr.AsyncState as Remoter;
 6                         //
 7                         var response = state.Request.EndGetResponse(arr) as HttpWebResponse;
 8                         var respStream = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("UTF-8"));
 9                         action(state, respStream.ReadToEnd());
10                         respStream.Close();
11                         response.Close();
12                     }, this);

异步响应回调,闭包与于状态保持

   private void
SetResult(Remoter state, string jsonData) 解析:

Ajax 15Ajax 16

1                 state.Result = jsonData;
2                 state.ResponseFlag = true;

异步响应成功后,在状态保持中赋值结果

季、计划中之开源项目…

  
 计划继续会拿生育遭遇化解问题之重重地方汇集成一个类型【Meng.Net.dll】并开源至GitHub上,欢迎交流,共同提高~~

  至于本文所说的类会在哪个命名空间中,还从来不想吓,项目的整结构和主打方向,敬请期待……

 

                                         蒙

                                    2016-09-24
 22:37  周六

 

 

 

       

                    

 

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