ASP.NET中利用WebClient上传图片到远程服务的方法-6ren

ASP.NET中利用WebClient上传图片到远程服务的方法

转载作者：qq735679552 更新时间：2022-09-29 22:32:09

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1、客户端。

1.页面。

 
    ? 
   
         <form id= 
         "Form1" 
         method= 
         "post" 
         runat= 
         "server" 
         enctype= 
         "multipart/form-data" 
         > 
        
         　　　　<input id= 
         "MyFile" 
         type= 
         "file" 
         runat= 
         "server" 
         /> 
        
         　　　　<br /> 
        
         　　　　<br /> 
        
         　　　　<asp:Button ID= 
         "Button1" 
         runat= 
         "server" 
         Text= 
         "上载文件" 
         OnClick= 
         "Button1_Click" 
         ></asp:Button> 
        
         　　</form>

2.后台。

 
    ? 
   
         System.Web.HttpFileCollection oFiles = System.Web.HttpContext.Current.Request.Files; 
        
         string 
         FilePath = oFiles[0].FileName; 
        
         string 
         FileName = FilePath.Substring(FilePath.LastIndexOf( 
         "\\" 
         ) + 1); 
        
         byte 
         [] b =  
         new 
         byte 
         [oFiles[0].ContentLength]; 
        
         System.IO.Stream fs = (System.IO.Stream)oFiles[0].InputStream; 
        
         fs.Read(b, 0, oFiles[0].ContentLength); 
        
         string 
         postData =  
         "data=" 
         + HttpUtility.UrlEncode(Convert.ToBase64String(b)); 
        
         var webclient =  
         new 
         WebClient(); 
        
         webclient.Headers.Add( 
         "Content-Type" 
         ,  
         "application/x-www-form-urlencoded" 
         ); 
        
         byte 
         [] byteArray = Encoding.UTF8.GetBytes(postData); 
        
         //byte[] buffer = webclient.UploadData("http://localhost/datapush/DataPush.ashx", "POST", byteArray);//ashx 
        
         byte 
         [] buffer = webclient.UploadData( 
         "http://localhost/datapush/WebServiceDataPush.asmx/DataPush" 
         ,  
         "POST" 
         , byteArray);//asmx 
        
         var msg = Encoding.UTF8.GetString(buffer); 
        
         Response.Write(msg);

2、服务端。

 
    ? 
   
         string 
         msg =  
         "" 
         ; 
        
         byte 
         [] filedata = Convert.FromBase64String(context.Request[ 
         "data" 
         ]); 
        
         if 
         (filedata.Length == 0) 
        
         { 
        
         msg=  
         "{\"code\":\"上传的是空文件\"}" 
         ; 
        
         } 
        
         if 
         (filedata.Length > 1048576) 
        
         { 
        
         msg =  
         "{\"code\":\"图片大小不能超过1M\"}" 
         ; 
        
         } 
        
         string 
         fileextension = filedata[0].ToString() + filedata[1].ToString(); 
        
         if 
         (fileextension ==  
         "7173" 
         ) 
        
         { 
        
         fileextension =  
         "gif" 
         ; 
        
         } 
        
         else 
         if 
         (fileextension ==  
         "255216" 
         ) 
        
         { 
        
         fileextension =  
         "jpg" 
         ; 
        
         } 
        
         else 
         if 
         (fileextension ==  
         "13780" 
         ) 
        
         { 
        
         fileextension =  
         "png" 
         ; 
        
         } 
        
         else 
         if 
         (fileextension ==  
         "6677" 
         ) 
        
         { 
        
         fileextension =  
         "bmp" 
         ; 
        
         } 
        
         else 
         if 
         (fileextension ==  
         "7373" 
         ) 
        
         { 
        
         fileextension =  
         "tif" 
         ; 
        
         } 
        
         else 
        
         { 
        
         msg =  
         "{\"code\":\"上传的文件不是图片\"}" 
         ; 
        
         } 
        
         try 
        
         { 
        
         //保存图片 
        
         string 
         filename = Guid.NewGuid().ToString( 
         "D" 
         ) +  
         "." 
         + fileextension; 
        
         System.IO.MemoryStream ms =  
         new 
         System.IO.MemoryStream(filedata); 
        
         System.IO.FileStream fs =  
         new 
         System.IO.FileStream(context.Server.MapPath( 
         "~/" 
         ) +  
         "/采集图片/" 
         + filename, System.IO.FileMode.Create); 
        
         ms.WriteTo(fs); 
        
         ms.Close(); 
        
         fs.Close(); 
        
         fs =  
         null 
         ; 
        
         ms =  
         null 
         ; 
        
         msg =  
         "{\"code\":\"上传图片成功\"}" 
         ; 
        
         } 
        
         catch 
         (Exception exe) 
        
         { 
        
         msg =  
         "{\"code\":\"" 
         + exe.Message +  
         "\"}" 
         ; 
        
         }