如何利用”七牛云”在UEditor实现图片的上传和浏览

在学习之前，我参考了朋友些的一篇关于这个功能实现的文章，非常不错。大家可以参考：http://www.cnblogs.com/John-Marnoon/p/5818528.html#3501846

里面都写了具体的实现，我也是参照朋友的文章来操作的。现在我重新整理一下实现的步骤：

1 . 注册一个七牛云用户

2.  在七牛云网站中创建一个空间来存储图片，存储区域选择 华东或是 华北，请先记得上传到华东1区的域名为up.qiniu.com、up-z0.qiniu.com和upload.qiniu.com；上传到华北1区的域名为up-z1.qiniu.com和upload-z1.qiniu.com ，后面写代码需要用到。

3. 查看七牛云的密钥管理

4. 查看空间的域名

5. 修改UEditor中的 UploadHandler类的代码。实现代码如下

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using Qiniu.Auth;
using Qiniu.IO;
using Qiniu.IO.Resumable;
using Qiniu.RS;

/// <summary>
/// UploadHandler 的摘要说明
/// </summary>
public class UploadHandler : Handler
{

    public UploadConfig UploadConfig { get; private set; }
    public UploadResult Result { get; private set; }

    public UploadHandler(HttpContext context, UploadConfig config)
        : base(context)
    {
        this.UploadConfig = config;
        this.Result = new UploadResult() { State = UploadState.Unknown };
    }

    public override void Process()
    {
        byte[] uploadFileBytes = null;
        string uploadFileName = null;

        if (UploadConfig.Base64)
        {
            uploadFileName = UploadConfig.Base64Filename;
            uploadFileBytes = Convert.FromBase64String(Request[UploadConfig.UploadFieldName]);
        }
        else
        {
            var file = Request.Files[UploadConfig.UploadFieldName];
            uploadFileName = file.FileName;

            if (!CheckFileType(uploadFileName))
            {
                Result.State = UploadState.TypeNotAllow;
                WriteResult();
                return;
            }
            if (!CheckFileSize(file.ContentLength))
            {
                Result.State = UploadState.SizeLimitExceed;
                WriteResult();
                return;
            }

            uploadFileBytes = new byte[file.ContentLength];
            try
            {
                file.InputStream.Read(uploadFileBytes, 0, file.ContentLength);
            }
            catch (Exception)
            {
                Result.State = UploadState.NetworkError;
                WriteResult();
            }
        }

        Result.OriginFileName = uploadFileName;
        DateTime today = DateTime.Today;
        string qiNiuFileName =   "upload/" + today.Year + "/" + today.Month + "/" + today.Day + "/" + RuPengCommons.CommonHelper.CalcMD5(uploadFileBytes) + Path.GetExtension(uploadFileName);

    //    var savePath = PathFormatter.Format(uploadFileName, UploadConfig.PathFormat);
     //   var localPath = Server.MapPath(savePath);
        try
        {
        //    if (!Directory.Exists(Path.GetDirectoryName(localPath)))
        //    {
        //        Directory.CreateDirectory(Path.GetDirectoryName(localPath));
        //    }
        //    File.WriteAllBytes(localPath, uploadFileBytes);
        //    Result.Url = savePath;
        //    Result.State = UploadState.Success;
            Qiniu.Conf.Config.ACCESS_KEY = "MUahZ72rD1AMFaLqKBk0I382FSVVWib8ArK-7oKP";
            Qiniu.Conf.Config.SECRET_KEY = "mi3P4qzsfXiHJ7Rr9wwCBH7smRHQabpRnEFeDIuw";
             //上传域名为：上传到华东1区的域名为up.qiniu.com、up-z0.qiniu.com和upload.qiniu.com；上传到华北1区的域名为up-z1.qiniu.com和upload-z1.qiniu.com
            Qiniu.Conf.Config.UP_HOST = "http://up-z1.qiniu.com";
            IOClient target = new IOClient();
            PutExtra extra = new PutExtra();
            //设置上传的空间
            String bucket = "tupian";
            //设置上传的文件的key值
            String key = qiNiuFileName;

            //普通上传,只需要设置上传的空间名就可以了,第二个参数可以设定token过期时间
            PutPolicy put = new PutPolicy(bucket, 3600);

            //调用Token()方法生成上传的Token
            string upToken = put.Token();
            //上传文件的路径
            MemoryStream ms = new MemoryStream(uploadFileBytes);

            //调用PutFile()方法上传
            // PutRet ret = target.PutFile(upToken, key, filePath, extra);
            PutRet ret = target.Put(upToken, key,ms, extra);

            Result.Url = "http://od6b842wn.bkt.clouddn.com/" + qiNiuFileName;

            Result.State = UploadState.Success;
        }
        catch (Exception e)
        {
            Result.State = UploadState.FileAccessError;
            Result.ErrorMessage = e.Message;
        }
        finally
        {
            WriteResult();
        }
    }

    private void WriteResult()
    {
        this.WriteJson(new
        {
            state = GetStateMessage(Result.State),
            url = Result.Url,
            title = Result.OriginFileName,
            original = Result.OriginFileName,
            error = Result.ErrorMessage
        });
    }

    private string GetStateMessage(UploadState state)
    {
        switch (state)
        {
            case UploadState.Success:
                return "SUCCESS";
            case UploadState.FileAccessError:
                return "文件访问出错，请检查写入权限";
            case UploadState.SizeLimitExceed:
                return "文件大小超出服务器限制";
            case UploadState.TypeNotAllow:
                return "不允许的文件格式";
            case UploadState.NetworkError:
                return "网络错误";
        }
        return "未知错误";
    }

    private bool CheckFileType(string filename)
    {
        var fileExtension = Path.GetExtension(filename).ToLower();
        return UploadConfig.AllowExtensions.Select(x => x.ToLower()).Contains(fileExtension);
    }

    private bool CheckFileSize(int size)
    {
        return size < UploadConfig.SizeLimit;
    }
}

public class UploadConfig
{
    /// <summary>
    /// 文件命名规则
    /// </summary>
    public string PathFormat { get; set; }

    /// <summary>
    /// 上传表单域名称
    /// </summary>
    public string UploadFieldName { get; set; }

    /// <summary>
    /// 上传大小限制
    /// </summary>
    public int SizeLimit { get; set; }

    /// <summary>
    /// 上传允许的文件格式
    /// </summary>
    public string[] AllowExtensions { get; set; }

    /// <summary>
    /// 文件是否以 Base64 的形式上传
    /// </summary>
    public bool Base64 { get; set; }

    /// <summary>
    /// Base64 字符串所表示的文件名
    /// </summary>
    public string Base64Filename { get; set; }
}

public class UploadResult
{
    public UploadState State { get; set; }
    public string Url { get; set; }
    public string OriginFileName { get; set; }

    public string ErrorMessage { get; set; }
}

public enum UploadState
{
    Success = 0,
    SizeLimitExceed = -1,
    TypeNotAllow = -2,
    FileAccessError = -3,
    NetworkError = -4,
    Unknown = 1,
}

6. 在后台的UEditor上传图片

7. 在后台保存成功后，在前台预览

8.七牛云的C# SDK 使用指南和下载地址

http://developer.qiniu.com/code/v6/sdk/csharp.html