Restful风格wcf调用3——Stream
写在前面
上篇文章介绍了restful接口的增删改查,本篇文章将介绍,如何通过数据流进行文件的上传及下载操作。
系列文章
一个例子
添加一个wcf服务,并在global.asax中注册路由,并修改svc文件的标记,添加Factory属性。
//注册路由 System.Web.Routing.RouteTable.Routes.Add(new System.ServiceModel.Activation.ServiceRoute( "imageService", new System.ServiceModel.Activation.WebServiceHostFactory(), typeof(ImageService)));
<%@ ServiceHost Language="C#" Debug="true" Service="Wolfy.WCFRestfuleDemo.ImageService" CodeBehind="ImageService.svc.cs" Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>
契约
namespace Wolfy.WCFRestfuleDemo { // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IImageService" in both code and config file together. [ServiceContract] public interface IImageService { /// <summary> /// 根据图片的相对路径获取文件流 /// </summary> /// <param name="imgUrl"></param> /// <returns></returns> [OperationContract] [WebGet(UriTemplate = "api/{imagUrl}")] Stream GetImageStream(string imgUrl); /// <summary> /// 上传图片 /// </summary> /// <param name="imgStream"></param> /// <param name="imageName"></param> [OperationContract] [WebInvoke(UriTemplate = "api/{imageName}", Method = "POST")] void UploadImage(Stream imgStream, string imageName); /// <summary> /// 获得所有图片的相对路径 /// </summary> /// <returns></returns> [OperationContract] [WebGet(UriTemplate = "api/list", ResponseFormat = WebMessageFormat.Xml)] string[] GetImages(); } }
实现
using System; using System.Collections.Generic; using System.Drawing; using System.IO; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.ServiceModel.Web; using System.Text; namespace Wolfy.WCFRestfuleDemo { // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "ImageService" in code, svc and config file together. // NOTE: In order to launch WCF Test Client for testing this service, please select ImageService.svc or ImageService.svc.cs at the Solution Explorer and start debugging. public class ImageService : IImageService { /// <summary> /// 根据图片的相对路径获取文件流 /// </summary> /// <param name="imgUrl"></param> /// <returns></returns> public System.IO.Stream GetImageStream(string imgUrl) { var contentType = Path.GetExtension(imgUrl).Trim('.'); WebOperationContext woc = WebOperationContext.Current; //根据请求的图片类型,动态设置contenttype woc.OutgoingResponse.ContentType = "image/" + contentType; string savePath = System.Web.HttpContext.Current.Server.MapPath("/Images"); string filePath = Path.Combine(savePath, imgUrl); return File.OpenRead(filePath); } /// <summary> /// 上传图片 /// </summary> /// <param name="imgStream"></param> /// <param name="imageName"></param> public void UploadImage(System.IO.Stream imgStream, string imageName) { var dir = System.Web.HttpContext.Current.Server.MapPath("~/Images"); var file = Path.Combine(dir, imageName); var bitmap = Bitmap.FromStream(imgStream); bitmap.Save(file); } /// <summary> /// 获得所有图片的相对路径 /// </summary> /// <returns></returns> public string[] GetImages() { List<string> lstImages = new List<string>(); var dir = System.Web.HttpContext.Current.Server.MapPath("~/Images"); string[] paths = Directory.GetFiles(dir); for (int i = 0; i < paths.Length; i++) { lstImages.Add(paths[i].Replace(dir, "")); } return lstImages.ToArray(); } } }
首先,进行上传文件1.jpg
try { var httpClient = new HttpClient(); var strPostUrl = "http://localhost:21074/imageService/api/{0}"; string fileName = Path.GetFileName("1.jpg"); FileStream fs = new FileStream("1.jpg", FileMode.Open, FileAccess.Read, FileShare.ReadWrite); HttpResponseMessage response = httpClient.Post(string.Format(strPostUrl, fileName), HttpContent.Create(fs)); fs.Dispose(); Console.WriteLine("上传成功"); } catch (Exception) { throw; }
客户端提示
查看Images目录,1.jpg已经上传成功。
通过restful服务在浏览器中查看:在浏览器中发送get请求,将会调用GetImageStream方法,将stream响应给浏览器,浏览器进行渲染。
还剩最后一个接口测试,返回所有的图片。因为wcf寄宿的也是一个web站点,所以也可以通过在浏览器中直接调用,将会返回所有的图片的相对路径的xml信息并在页面上进行展示。
总结
本文介绍了restful接口如何处理post过来的stream,以及如何返回stream给客户端的方式,这里也是一种上传下载文件的一种方式。
参考资料
http://blog.csdn.net/fangxing80/article/details/6261431
- 博客地址:http://www.cnblogs.com/wolf-sun/
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