利用WebService发布图片文件

浏览数：41 / 时间：2015年06月09日

服务器端：

1.新建一个Asp.net空网站RGImageServer

2.新建一个WebService项目ImageService，项目新增文件ImageService.asmx，添加方法GetTile()。

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.Services;
 6 using System.IO;
 7 using System.Configuration;
 8 
 9 namespace RGImageServer
10 {
11     /// <summary>
12     /// ImageServices 的摘要说明
13     /// </summary>
14     [WebService(Namespace = "http://tempuri.org/")]
15     [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
16     [System.ComponentModel.ToolboxItem(false)]
17     // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
18     // [System.Web.Script.Services.ScriptService]
19     public class ImageServices : System.Web.Services.WebService
20     {
21 
22         [WebMethod]
23         public string HelloWorld()
24         {
25             return "Hello World";
26         }
27         private byte[] Stream2Bytes(Stream theStream)
28         {
29             int num;
30             MemoryStream stream = new MemoryStream();
31             while ((num = theStream.ReadByte()) != -1)
32             {
33                 stream.WriteByte((byte)num);
34             }
35             theStream.Close();
36             return stream.ToArray();
37         }
38         [WebMethod]
39         public void GetTile(string imageName)
40         {
41             string filename = ConfigurationManager.AppSettings["ImagePath"] + @"\" + imageName;
42             HttpContext context = this.Context;
43             if (File.Exists(filename))
44             {
45                 try
46                 {
47                     FileStream theStream = File.OpenRead(filename);
48                     context.Response.ContentType = "image/png";
49                     byte[] buffer = Stream2Bytes(theStream);
50                     context.Response.OutputStream.Write(buffer, 0, buffer.Length);
51                 }
52                 catch (Exception)
53                 {
54                     context.Response.StatusCode = 500;
55                 }
56             }
57         }
58     }
59 }

View Code

3.配置WebConfig文件，发布服务

 1 <?xml version="1.0" encoding="utf-8"?>
 2 
 3 <!--
 4   有关如何配置 ASP.NET 应用程序的详细消息，请访问
 5   http://go.microsoft.com/fwlink/?LinkId=169433
 6   -->
 7 
 8 <configuration>
 9   <system.web>
10     <compilation debug="true" targetFramework="4.0" />
11     <webServices>
12       <protocols>
13         <add name="HttpGet" />
14         <add name="HttpPost" />
15         <add name="HttpSoap" />
16       </protocols>
17     </webServices>
18   </system.web>
19   <appSettings>
20     <add key="ImagePath" value="E:\"/>
21   </appSettings>
22 </configuration>

View Code

客户端：

1.调用下载图片代码如下：

 1 public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7         Stream ContentStream;
 8         HttpWebResponse response = null;
 9         string ContentType;
10         string ContentEncoding;
11         int ContentLength = 0;
12         int BytesProcessed;
13         private void button1_Click(object sender, EventArgs e)
14         {
15             ImageServices server = new ImageServices();
16             string Url = "http://localhost:6235/ImageServices.asmx/GetTile?imageName=aa.png";
17             string SavedFilePath = "D:\\bb.png";
18             // Download to file
19             string targetDirectory = Path.GetDirectoryName(SavedFilePath);
20             if (targetDirectory.Length > 0)
21                 Directory.CreateDirectory(targetDirectory);
22             ContentStream = new FileStream(SavedFilePath, FileMode.Create);
23             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
24             request.ContentType = "text/xml";
25             using (response = request.GetResponse() as HttpWebResponse)
26             {
27                 // only if server responds 200 OK
28                 if (response.StatusCode == HttpStatusCode.OK)
29                 {
30                     ContentType = response.ContentType;
31                     ContentEncoding = response.ContentEncoding;
32 
33                     // Find the data size from the headers.
34                     string strContentLength = response.Headers["Content-Length"];
35                     if (strContentLength != null)
36                     {
37                         ContentLength = int.Parse(strContentLength);
38                     }
39                     //缓存字节数组，大小1500byte
40                     byte[] readBuffer = new byte[1500];
41                     using (Stream responseStream = response.GetResponseStream())
42                     {
43                         while (true)
44                         {
45                             //  Pass do.readBuffer to BeginRead.
46                             int bytesRead = responseStream.Read(readBuffer, 0, readBuffer.Length);
47                             if (bytesRead <= 0)
48                                 break;
49                             ContentStream.Write(readBuffer, 0, bytesRead);
50                             BytesProcessed += bytesRead;
51                         }
52                     }
53                     ContentStream.Close();
54                     ContentStream.Dispose();
55                     ContentStream = null;
56                 }
57             }
58 
59 
60         }
61     }