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ASP.NET MVC在服务端把异步上传的图片裁剪成不同尺寸分别保存,并设置上传目录的尺寸限制

时间:2015-08-04 12:53:11      阅读:147      评论:0      收藏:0      [点我收藏+]

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我曾经试过使用JSAjaxFileUploader插件来把文件、照片以异步的方式上传,就像"MVC文件图片ajax上传轻量级解决方案,使用客户端JSAjaxFileUploader插件01-单文件上传"中说的,这种方法足够轻、足够好。但今天,要在前面的基础上再增加2个需求:

 

1、异步判断上传的图片是否超过最大限制
2、把上传的图片裁剪成大中小3张图片,分别保存,删除的时候一块被删除

 

上传图片如果超出最大尺寸限制,终止上传,并报错误信息。
技术分享

 

前台上传图片,显示缩略图。
技术分享

 

在项目根目录下的指定文件夹AjaxUpload中同时有了大中小3张图片。
技术分享

 

点击图片行的删除按钮或重新上传新的图片,原先的大中小3张图片一块被删除。重新上传新图片:
技术分享

 

在项目根目录下的指定文件夹AjaxUpload中同时有了新的大中小3张图片。
技术分享


前端还是使用JSAjaxFileUploader插件,后端使用ImageResizer组件实现对图片的裁剪和保存。

 

当前端拿到异步请求的返回结果后,需要显示图片、记录下图片的名称、错误信息等,可以把这些信息封装到UploadFileResult类中,让服务端以json格式返回。

http://www.cnblogs.com/namespace MvcApplication1.Models
{
    http://www.cnblogs.com/public http://www.cnblogs.com/class UploadFileResult
    {
        http://www.cnblogs.com/public http://www.cnblogs.com/string LargeFileName { http://www.cnblogs.com/get; http://www.cnblogs.com/set; } http://www.cnblogs.com///带后缀名的图片名称,比如:20141112_large.jpg
        http://www.cnblogs.com/public http://www.cnblogs.com/string MediumFileName { http://www.cnblogs.com/get; http://www.cnblogs.com/set; }
        http://www.cnblogs.com/public http://www.cnblogs.com/string SmallFileName { http://www.cnblogs.com/get; http://www.cnblogs.com/set; } 
        http://www.cnblogs.com/public http://www.cnblogs.com/int Length { http://www.cnblogs.com/get; http://www.cnblogs.com/set; } http://www.cnblogs.com///图片的字节数
        http://www.cnblogs.com/public http://www.cnblogs.com/string Type { http://www.cnblogs.com/get; http://www.cnblogs.com/set; } http://www.cnblogs.com///图片的类型:image/jpeg
        http://www.cnblogs.com/public http://www.cnblogs.com/bool IsValid { http://www.cnblogs.com/get; http://www.cnblogs.com/set; } http://www.cnblogs.com///用来判断是否超过尺寸最大限制
        http://www.cnblogs.com/public http://www.cnblogs.com/string Message { http://www.cnblogs.com/get; http://www.cnblogs.com/set; }
        http://www.cnblogs.com/public http://www.cnblogs.com/string LargeFilePath { http://www.cnblogs.com/get; http://www.cnblogs.com/set; }  http://www.cnblogs.com///图片的保存路径:~/AjaxUpload/20141112_large.jpg
        http://www.cnblogs.com/public http://www.cnblogs.com/string MediumFilePath { http://www.cnblogs.com/get; http://www.cnblogs.com/set; }
        http://www.cnblogs.com/public http://www.cnblogs.com/string SmallFilePath { http://www.cnblogs.com/get; http://www.cnblogs.com/set; }  
    }
}

以上,
○ 
LargeFileName用来保存裁剪大图的名称,类似"20141112_large.jpg",当前台需要删除图片的时候,还需要把这个图片名称传递给服务端,再到指定文件夹删除图片。
○ 
LargeFilePath用来保存图片的路径,类似"~/AjaxUpload/20141112_large.jpg",前台显示图片的时候需要这个。
○ 
IsValid为true表示可以裁剪保存图片,为false表示超过最大的尺寸限制,取消上传

 

通过NuGet安装ImageResizer。安装完后,在"引用"下面多了一个ImageResizer组件。
技术分享

 

创建HomeController,主要完成以下工作:
1、接收前台上传图片,裁剪成大中小图片并分别保存
2、接收前台需要删除的图片名称,在指定文件夹中同时删除大中小图片
3、提供递归统计指定文件夹大小的方法
......

http://www.cnblogs.com/using System;
http://www.cnblogs.com/using System.Collections.Generic;
http://www.cnblogs.com/using System.IO;
http://www.cnblogs.com/using System.Web;
http://www.cnblogs.com/using System.Web.Mvc;
http://www.cnblogs.com/using ImageResizer;
http://www.cnblogs.com/using MvcApplication1.Models;

http://www.cnblogs.com/namespace MvcApplication1.Controllers
{
    http://www.cnblogs.com/public http://www.cnblogs.com/class HomeController : Controller
    {

        http://www.cnblogs.com/public ActionResult Index()
        {
            http://www.cnblogs.com/return View();
        }

        [HttpPost]
        http://www.cnblogs.com/public ActionResult UploadFile()
        {
            http://www.cnblogs.com///需要返回给前台的结果
            List<UploadFileResult> results = http://www.cnblogs.com/new List<UploadFileResult>();

            http://www.cnblogs.com///遍历从前台传递而来的文件
            http://www.cnblogs.com/foreach (http://www.cnblogs.com/string file http://www.cnblogs.com/in Request.Files)
            {
                http://www.cnblogs.com///把每一个上传文件封装成HttpPostedFileBase
                HttpPostedFileBase hpf = Request.Files[file] http://www.cnblogs.com/as HttpPostedFileBase;

                http://www.cnblogs.com///如果前台传来的文件集合中有null,继续遍历其他文件
                http://www.cnblogs.com/if (hpf.ContentLength == 0 || hpf == http://www.cnblogs.com/null)
                {
                    http://www.cnblogs.com/continue;
                }

                http://www.cnblogs.com///给上传文件改名
                http://www.cnblogs.com/string date = DateTime.Now.ToString("http://www.cnblogs.com/yyyyMMddhhmmss");

                http://www.cnblogs.com///目标文件夹的相对路径 ImageSize需要的格式
                http://www.cnblogs.com/string pathForSaving = Server.MapPath("http://www.cnblogs.com/~/AjaxUpload/");

                http://www.cnblogs.com///目标文件夹的相对路径 统计文件夹大小需要的格式
                http://www.cnblogs.com/string pathForSaving1 = Server.MapPath("http://www.cnblogs.com/~/AjaxUpload");

                http://www.cnblogs.com///保存文件并返回结果
                http://www.cnblogs.com/if (http://www.cnblogs.com/this.CreateFolderIfNeeded(pathForSaving))
                {
                    http://www.cnblogs.com/long currentSize = GetDirectoryLength(pathForSaving1);

                    http://www.cnblogs.com///如果大于最大限制,直接返回json信息
                    http://www.cnblogs.com///1M=1024*1024个字节
                    http://www.cnblogs.com/if (currentSize + hpf.ContentLength > 50 * 1024 * 1024)http://www.cnblogs.com///最大允许50兆
                    {
                        results.Add(http://www.cnblogs.com/new UploadFileResult()
                        {
                            LargeFileName = "http://www.cnblogs.com/",
                            LargeFilePath = "http://www.cnblogs.com/",
                            MediumFileName = "http://www.cnblogs.com/",
                            MediumFilePath = "http://www.cnblogs.com/",
                            SmallFileName = "http://www.cnblogs.com/",
                            SmallFilePath = "http://www.cnblogs.com/",
                            IsValid = http://www.cnblogs.com/false,
                            Length = hpf.ContentLength,
                            Message = "http://www.cnblogs.com/超过最大限制无法上传",
                            Type = hpf.ContentType
                        });
                    }
                    http://www.cnblogs.com/else http://www.cnblogs.com///如果小于最大限制,才保存大中小图片
                    {
                        http://www.cnblogs.com///保存图片的各种版本:小图,中图,大图
                        var versions = http://www.cnblogs.com/new Dictionary<http://www.cnblogs.com/string, http://www.cnblogs.com/string>();
                        versions.Add("http://www.cnblogs.com/_small", "http://www.cnblogs.com/maxwidth=50&maxheight=50&format=jpg");
                        versions.Add("http://www.cnblogs.com/_medium", "http://www.cnblogs.com/maxwidth=200&maxheight=200&format=jpg");
                        versions.Add("http://www.cnblogs.com/_large", "http://www.cnblogs.com/maxwidth=600&maxheight=600&format=jpg");

                        http://www.cnblogs.com///保存各个版本的缩略图
                        http://www.cnblogs.com/foreach (var key http://www.cnblogs.com/in versions.Keys)
                        {
                            hpf.InputStream.Seek(0, SeekOrigin.Begin);
                            ImageBuilder.Current.Build(http://www.cnblogs.com/new ImageJob(
                                hpf.InputStream,
                                pathForSaving + date + key, http://www.cnblogs.com///不带后缀名的图片名称
                                http://www.cnblogs.com/new Instructions(versions[key]),
                                http://www.cnblogs.com/false,http://www.cnblogs.com///是否保留原图
                                http://www.cnblogs.com/true));http://www.cnblogs.com///是否增加后缀
                        }


                        results.Add(http://www.cnblogs.com/new UploadFileResult()
                        {
                            LargeFileName = date + "http://www.cnblogs.com/_large" + "http://www.cnblogs.com/.jpg",
                            LargeFilePath = Url.Content(String.Format("http://www.cnblogs.com/~/AjaxUpload/{0}", date + "http://www.cnblogs.com/_large" + "http://www.cnblogs.com/.jpg")),
                            MediumFileName = date + "http://www.cnblogs.com/_medium" + "http://www.cnblogs.com/.jpg",
                            MediumFilePath = Url.Content(String.Format("http://www.cnblogs.com/~/AjaxUpload/{0}", date + "http://www.cnblogs.com/_mediume" + "http://www.cnblogs.com/.jpg")),
                            SmallFileName = date + "http://www.cnblogs.com/_small" + "http://www.cnblogs.com/.jpg",
                            SmallFilePath = Url.Content(String.Format("http://www.cnblogs.com/~/AjaxUpload/{0}", date + "http://www.cnblogs.com/_small" + "http://www.cnblogs.com/.jpg")),
                            IsValid = http://www.cnblogs.com/true,
                            Length = hpf.ContentLength,
                            Message = "http://www.cnblogs.com/上传成功",
                            Type = hpf.ContentType
                        });
                    }
                    
                }
            }

            http://www.cnblogs.com///单文件上传,实际上results中只有一个元素
            http://www.cnblogs.com/return Json(http://www.cnblogs.com/new
            {
                largename = results[0].LargeFileName,
                largepath = results[0].LargeFilePath,
                mediumname = results[0].MediumFileName,
                mediumpath = results[0].MediumFilePath,
                smallname = results[0].SmallFileName,
                smallpath = results[0].SmallFilePath,
                type = results[0].Type,
                size = http://www.cnblogs.com/string.Format("http://www.cnblogs.com/{0} bytes", results[0].Length),                
                msg = results[0].Message,
                isvalid = results[0].IsValid
            });
        }


        http://www.cnblogs.com///根据文件名称删除文件
        [HttpPost]
        http://www.cnblogs.com/public ActionResult DeleteFileByNames(http://www.cnblogs.com/string largename, http://www.cnblogs.com/string mediumname, http://www.cnblogs.com/string smallname) 
        {
            http://www.cnblogs.com/string pathForSaving = Server.MapPath("http://www.cnblogs.com/~/AjaxUpload");
            System.IO.File.Delete(Path.Combine(pathForSaving, largename));
            System.IO.File.Delete(Path.Combine(pathForSaving, mediumname));
            System.IO.File.Delete(Path.Combine(pathForSaving, smallname));
            http://www.cnblogs.com/return Json(http://www.cnblogs.com/new
            {
                msg = http://www.cnblogs.com/true
            });
        }

        http://www.cnblogs.com//// <summary>
        http://www.cnblogs.com//// 根据目标文件夹的相对路径创建文件夹
        http://www.cnblogs.com//// 如果目标文件夹不存在,就创建;存在就不创建
        http://www.cnblogs.com//// 只有在创建目标文件夹发生异常的时候才返回false
        http://www.cnblogs.com//// </summary>
        http://www.cnblogs.com//// <param name="path">目标文件夹的相对路径</param>
        http://www.cnblogs.com//// <returns></returns>
        http://www.cnblogs.com/private http://www.cnblogs.com/bool CreateFolderIfNeeded(http://www.cnblogs.com/string path)
        {
            http://www.cnblogs.com/bool result = http://www.cnblogs.com/true;
            http://www.cnblogs.com/if (!Directory.Exists(path))
            {
                http://www.cnblogs.com/try
                {
                    Directory.CreateDirectory(path);
                }
                http://www.cnblogs.com/catch (Exception)
                {
                    result = http://www.cnblogs.com/false;
                }
            }
            http://www.cnblogs.com/return result;
        }

        http://www.cnblogs.com//// <summary>
        http://www.cnblogs.com//// 根据目标文件夹的相对路径递归计算该文件夹的大小
        http://www.cnblogs.com//// </summary>
        http://www.cnblogs.com//// <param name="path">用相对路径表示的目标文件夹</param>
        http://www.cnblogs.com//// <returns></returns>
        http://www.cnblogs.com/private http://www.cnblogs.com/static http://www.cnblogs.com/long GetDirectoryLength(http://www.cnblogs.com/string path)
        {
            http://www.cnblogs.com///如果目标文件夹不存在就返回0
            http://www.cnblogs.com/if (!Directory.Exists(path))
            {
                http://www.cnblogs.com/return 0;
            }

            http://www.cnblogs.com/long size = 0;

            http://www.cnblogs.com///获取目标文件夹的信息
            DirectoryInfo di = http://www.cnblogs.com/new DirectoryInfo(path);

            http://www.cnblogs.com///遍历目标文件夹下的所有文件遍历累计每个文件的大小
            http://www.cnblogs.com/foreach (FileInfo fi http://www.cnblogs.com/in di.GetFiles())
            {
                size += fi.Length;
            }

            http://www.cnblogs.com///获取目标文件夹下的所有子文件夹
            DirectoryInfo[] dis = di.GetDirectories();

            http://www.cnblogs.com///如果确实有子文件夹
            http://www.cnblogs.com/if (dis.Length > 0)
            {
                http://www.cnblogs.com///遍历这些子文件夹
                http://www.cnblogs.com/for (http://www.cnblogs.com/int i = 0; i < dis.Length; i++)
                {
                    http://www.cnblogs.com///递归统计累计大小
                    size += GetDirectoryLength(dis[i].FullName);
                }
            }

            http://www.cnblogs.com/return size;
        }
    }
}

以上,
○ 
UploadFile方法中,通过Request.Files拿到所有的上传图片,然后遍历这些图片,通过Request.Files[key]获取某个图片,把该图片转换成HttpPostedFileBase类型。在裁剪保存图片之前,使用GetDirectoryLength方法获取当前文件夹的尺寸,如果没有超过尺寸的最大限制,就使用ImageResizer把图片裁剪成大中小3张图片,并分别保存。

○ DeleteFileByNames方法中,从前台接收大中小图片的名称,再到根目录下的指定文件夹AjaxUpload中删除大中小3张图片。

 

_Layout.cshtml中引入相关css、js文件。JQuery.JSAjaxFileUploaderSingle.js文件已经做了汉化,详细参考这里

<head>
    <meta charset="http://www.cnblogs.com/utf-8" />
    <meta name="http://www.cnblogs.com/viewport" content="http://www.cnblogs.com/width=device-width" />
    <title>@ViewBag.Title</title>
    @Styles.Render("http://www.cnblogs.com/~/Content/css")
    <link href="http://www.cnblogs.com/~/Content/JSAjaxFileUploader/JQuery.JSAjaxFileUploader.css" rel="http://www.cnblogs.com/stylesheet" />
    @Scripts.Render("http://www.cnblogs.com/~/bundles/modernizr")
    @Scripts.Render("http://www.cnblogs.com/~/bundles/jquery")
    <script src="http://www.cnblogs.com/~/JSAjaxFileUploader/JQuery.JSAjaxFileUploaderSingle.js"></script>
</head>
<body>
    @RenderBody()    
    @RenderSection("http://www.cnblogs.com/scripts", required: http://www.cnblogs.com/false)
</body>

 

创建Home/Index.cshtml视图,主要工作包括:
1、处理图片上传,每次上传前需要把原先的3张图片删除,如果上传成功显示小图的缩略图,如果上传失败,给出错误提示。
2、提供一个动态创建图片行表格的方法
3、提供一个删除大中小图片的方法,向服务端发送3张图片的名称
......

 

@{
    ViewBag.Title = "http://www.cnblogs.com/Index";
    Layout = "http://www.cnblogs.com/~/Views/Shared/_Layout.cshtml";
}

<style type="http://www.cnblogs.com/text/css">
    #tb table {
        border-collapse: collapse;
        width: 600px;
    }

    #tb td {
        text-align: center;
        padding-top: 5px;
        width: 25%;
    }

    #tb tr {
        background-color: #E3E3E3;
        line-height: 35px;
    }

    .limit {
        color: red;
    }
</style>

<div id="http://www.cnblogs.com/testId"></div>

<div id="http://www.cnblogs.com/tb">
    <table id="http://www.cnblogs.com/tbl">
        <tbody>
        </tbody>
    </table>
</div>

<div>
    <span http://www.cnblogs.com/class="http://www.cnblogs.com/limit"></span>
</div>

@section scripts
{
    <script type="http://www.cnblogs.com/text/javascript">
        $(function() {
            http://www.cnblogs.com///隐藏显示图片的表格
            $(‘#tbl‘).hide();

            http://www.cnblogs.com///图片上传
            $(‘#testId‘).JSAjaxFileUploader({
                uploadUrl: ‘@Url.Action("http://www.cnblogs.com/UploadFile","http://www.cnblogs.com/Home")‘,
                inputText: ‘选择上传文件‘,
                http://www.cnblogs.com///fileName: ‘photo‘,
                maxFileSize: 512000,    http://www.cnblogs.com///Max 500 KB file 1kb=1024字节
                allowExt: ‘gif|jpg|jpeg|png‘,
                zoomPreview: http://www.cnblogs.com/false,
                zoomWidth: 360,
                zoomHeight: 360,
                beforesend: function (file) {http://www.cnblogs.com///每次点击都要删除原先的
                    http://www.cnblogs.com/if ($(‘.largeImgName‘).text() != "http://www.cnblogs.com/" && $(‘.mediumImgName‘).text() != "http://www.cnblogs.com/" && $(‘.smallImgName‘).text() != "http://www.cnblogs.com/") {
                        deleteImg();
                        $(‘#tbl‘).hide();
                    }
                },
                success: function (data) {
                    http://www.cnblogs.com/if (!data.isvalid) { http://www.cnblogs.com///如果尺寸超过最大限制
                        $(‘.limit‘).css("http://www.cnblogs.com/display", "http://www.cnblogs.com/block");
                        $(‘.limit‘).text(data.msg);
                        http://www.cnblogs.com/return;
                    } http://www.cnblogs.com/else {
                        $(‘.limit‘).css("http://www.cnblogs.com/display", "http://www.cnblogs.com/none");
                        createTableTr();
                        $(‘#tbl‘).show();
                        $(‘.showImg‘).attr("http://www.cnblogs.com/src", data.smallpath);http://www.cnblogs.com///显示小图片
                        $(‘.largeImgName‘).text(data.largename); http://www.cnblogs.com///显示大图的名称
                        $(‘.mediumImgName‘).text(data.mediumname); http://www.cnblogs.com///显示中图的名称
                        $(‘.smallImgName‘).text(data.smallname); http://www.cnblogs.com///显示小图的名称
                    }                   
                },
                error: function (data) {
                    alert(data.msg);
                }
            });

            http://www.cnblogs.com///点击删除链接删除刚上传图片
            $(‘#tbl‘).on("http://www.cnblogs.com/click", "http://www.cnblogs.com/.delImg", function () {
                deleteImg();
                http://www.cnblogs.com///window.location.reload();
            });
        });

        http://www.cnblogs.com///创建表格
        function createTableTr() {
            var table = $(‘#tbl‘);
            table.append("http://www.cnblogs.com/<tr><td><img class=‘showImg‘/></td><td colspan=‘2‘><span class=‘largeImgName‘></span><br/><span class=‘mediumImgName‘></span><br/><span class=‘smallImgName‘></span></td><td><a class=‘delImg‘ href=‘javascript:void(0)‘>删除</a></td></tr>");
        }

        http://www.cnblogs.com///删除图片方法:点击删除链接或上传新图片删除原先图片用到
        function deleteImg() {
            $.ajax({
                cache: http://www.cnblogs.com/false,
                url: ‘@Url.Action("http://www.cnblogs.com/DeleteFileByNames", "http://www.cnblogs.com/Home")‘,
                type: "http://www.cnblogs.com/POST",
                data: { largename: $(‘.largeImgName‘).text(), mediumname: $(‘.mediumImgName‘).text(), smallname: $(‘.smallImgName‘).text() },
                success: function (data) {
                    http://www.cnblogs.com/if (data.msg) {
                        http://www.cnblogs.com///alert("图片删除成功");
                        $(‘.delImg‘).parent().parent().remove();
                    }
                },
                error: function (jqXhr, textStatus, errorThrown) {
                    alert("http://www.cnblogs.com/出错了 ‘" + jqXhr.status + "http://www.cnblogs.com/‘ (状态: ‘" + textStatus + "http://www.cnblogs.com/‘, 错误为: ‘" + errorThrown + "http://www.cnblogs.com/‘)");
                }
            });
        }
    </script>
}

ASP.NET MVC在服务端把异步上传的图片裁剪成不同尺寸分别保存,并设置上传目录的尺寸限制

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原文地址:http://www.cnblogs.com/mili3/p/4701438.html

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