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kindeditor是一个非常好用的富文本编辑器，它的简单使用我就不再介绍了。 而kindeditor却对图片的处理不够理想。
本篇博文需要解决的问题有两个：
kindeditor扩展粘贴图片功能kindeditor修改图片上传路径并通过webapi上传图片到图片服务器(支持分布式图片)
结果演示
1.扩展粘贴图片功能演示
2.修改图片上传路径演示：
我们的网站演示地址是：http://localhost:9393/
我们的图片服务器地址是：http://localhost:9394/
我们可以看到图片被直接上传到了图片服务器。同时我们可以配置图片是上传到本地还是图片服务器。
扩展方案
1.粘贴图片功能扩展
具体请参考：/cztisthebest/p/5913353.html
2.修改图片上传路径并通过webapi上传图片到图片服务器功能扩展
第一步：引用LitJSON.dll
因为我使用的开发语言是C#& MVC。所以首先需要在项目中引用LitJSON.dll，如下图：
第二步：修改上传文件：upload_json.ashx
<%@ WebHandler Language="C#" Class="Upload" %>/*** KindEditor ** 本程序是演示程序，建议不要直接在实际项目中使用。* 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。**/using System;using System.Collections;using System.Web;using System.IO;using System.Globalization;using LitJson;public class Upload : IHttpHandler{private HttpContext context;public void ProcessRequest(HttpContext context){//定义允许上传的文件扩展名Hashtable extTable = new Hashtable();extTable.Add("image", "gif,jpg,jpeg,png,bmp");extTable.Add("flash", "swf,flv");extTable.Add("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");extTable.Add("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");//最大文件大小int maxSize = 1000000;this.context = context;HttpPostedFile imgFile = context.Request.Files["imgFile"];if (imgFile == null){showError("请选择文件。");}//文件类型String dirName = context.Request.QueryString["dir"];if (String.IsNullOrEmpty(dirName)){dirName = "image";}if (!extTable.ContainsKey(dirName)){showError("目录名不正确。");}String fileName = imgFile.FileName;String fileExt = Path.GetExtension(fileName).ToLower();if (imgFile.InputStream == null || imgFile.InputStream.Length > maxSize){showError("上传文件大小超过限制。");}if (String.IsNullOrEmpty(fileExt) || Array.IndexOf(((String)extTable[dirName]).Split(','), fileExt.Substring(1).ToLower()) == -1){showError("上传文件扩展名是不允许的扩展名。\n只允许" + ((String)extTable[dirName]) + "格式。");}var saveDir = context.Request["saveDir"];string saveDirStr = null;if (saveDir == null){saveDirStr = "tmp";}else{saveDirStr = saveDir.ToString();}//是否分布式上传bool isDFS = false;var dfs = context.Request["dfs"];if (dfs != null && dfs.ToString() == "1"){isDFS = true;}Hashtable hash = new Hashtable();if (isDFS){var imageUrl = Cloud.Utility.ConfigHelper.Images_SITE_URL;var client = new RestSharp.RestClient(imageUrl);//TODO api基路径var request = new RestSharp.RestRequest("file/upload", RestSharp.Method.POST);request.AlwaysMultipartFormData = true;request.AddHeader("dir", dirName + "/" + saveDirStr);request.AddHeader("imageUrl", imageUrl);request.AddFile("file", Cloud.Utility.StreamHelper.ConvertToBytes(imgFile.InputStream), context.Server.HtmlEncode(imgFile.FileName));var posttask = client.ExecutePostTaskAsync(request);if (posttask.Result.StatusCode == .HttpStatusCode.OK){var url = posttask.Result.Content.Trim(new char[] { '[', ']', '"' });hash["url"] = url;}else{showError("分布式上传失败");}}else{//文件保存目录string savePath = "/upload/kindeditor/" + dirName + "/" + saveDirStr;String dirPath = context.Server.MapPath(savePath);if (!Directory.Exists(dirPath)){Directory.CreateDirectory(dirPath);}String newFileName = DateTime.Now.ToString("_yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + fileExt;String filePath = dirPath + "/" + newFileName;imgFile.SaveAs(filePath);hash["url"] = savePath + "/" + newFileName;}hash["error"] = 0;context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");context.Response.Write(JsonMapper.ToJson(hash));context.Response.End();}private void showError(string message){Hashtable hash = new Hashtable();hash["error"] = 1;hash["message"] = message;context.Response.AddHeader("Content-Type", "text/html; charset=UTF-8");context.Response.Write(JsonMapper.ToJson(hash));context.Response.End();}public bool IsReusable{get{return true;}}}
客户端传过来一个文件保存目录的参数：saveDir
客户端传过来一个是否上传文件到图片服务器的参数：dfs，如果dfs=1代表上传到图片服务器，否则上传到本地
上传文件的核心代码：其中使用到了一个开源的上传组件RestSharp
第三步：webapi图片服务器端代码：
[Route("file/upload")][HttpPost]public async Task<HttpResponseMessage> PostFormData(){// Check if the request contains multipart/form-data.if (!Request.Content.IsMimeMultipartContent()){throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);}var dir = Request.Headers.GetValues("dir").First();var imageUrl = Request.Headers.GetValues("imageUrl").First();string root = System.Web.HttpContext.Current.Server.MapPath(bine("~/images/", dir));if (System.IO.Directory.Exists(root) == false){System.IO.Directory.CreateDirectory(root);}var provider = new MultipartFormDataStreamProvider(root);provider = new RenamingMultipartFormDataStreamProvider(root);//重命名写法await Request.Content.ReadAsMultipartAsync(provider);var urlList = new List<string>();var url = "";foreach (MultipartFileData file in provider.FileData){string path = file.LocalFileName;var start = path.IndexOf("\\images");path = path.Substring(start);var mainURL = imageUrl;// ConfigurationManager.AppSettings["MainImageURL"];url = mainURL + path.Replace("\\", "/");urlList.Add(url);//return Request.CreateResponse(HttpStatusCode.OK, url);}return Request.CreateResponse(HttpStatusCode.OK, urlList);}
其中文件重命名方法为：
/// <summary>/// 文件上传并重命名/// </summary>public class RenamingMultipartFormDataStreamProvider : MultipartFormDataStreamProvider{public string Root { get; set; }public RenamingMultipartFormDataStreamProvider(string root): base(root){Root = root;}public override string GetLocalFileName(HttpContentHeaders headers){string filePath = headers.ContentDisposition.FileName;// Multipart requests with the file name seem to always include quotes.if (filePath.StartsWith(@"""") && filePath.EndsWith(@""""))filePath = filePath.Substring(1, filePath.Length - 2);return Path.GetFileNameWithoutExtension(filePath)+ DateTime.Now.ToString("_yyyyMMddHHmmss_ffff", DateTimeFormatInfo.InvariantInfo) + Path.GetExtension(filePath).ToLower();return filePath;}}
第四步：kindeditor配置：
主要配置的是UploadJson参数：saveDir代表保存的目录，dfs代表是否上传到图片服务器，如果dfs=1代表上传到图片服务器否则上传到本地。
