【MVC】快速构建一个图片浏览网站

引言

     当抄完MusicStore时,你应该对MVC有一个比较清晰的认识了.接下来就需要做个网站来继续增加自己的知识了.那么,该做个什么网站呢.做个图片浏览网站吧,简单而实用.

简单设计

    1.首先,页面中间是个图片列表.将所有图片列出来是不太科学的,所以要做个分页浏览的功能.

    2.页面右边,有个图片排行榜,列出点击量前10名的图片名称.而且,同一时间段同一客户端的重复点击只能计算一次才合理的.

    3.有图片浏览就肯定有图片上传功能啦,还必须要是登录后才能上传.

数据层

    采用EF的Code First方式构建数据库,先定义一个ImageModle,放到DbContext数据上下文中,再定义一个DropCreateDatabaseIfModelChanges迁移类,在seed方法中初始化数据,如下

    public class ImageModle { [Display(Name="编号")] public int Id { get; set; } [Display(Name="图片名")] public string ImageName { get; set; } [Display(Name = "图片相对路径")] public string ImageUrl { get; set; } [Display(Name = "上传者")] public string Uploader { get; set; } [Display(Name = "点击数")] public int HitCount { get; set; } [Display(Name = "上传时间")] public DateTime UploadDateTime { get; set; } } public class ImageMangeEntities:DbContext { public ImageMangeEntities() : base("DefaultConnection") { } public DbSet<ImageModle> Images { get; set; } } public class ImageData : DropCreateDatabaseIfModelChanges<ImageMangeEntities> { protected override void Seed(ImageMangeEntities context) { context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片1", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片2", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片3", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片4", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片5", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片6", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片7", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片8", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片9", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698713w8Epfw.jpg", ImageName = "图片10", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698710MJjSR8.jpg", ImageName = "图片11", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片12", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/9662C9V1UU02.jpg", ImageName = "图片13", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698713w8Epfw.jpg", ImageName = "图片14", HitCount = 1, UploadDateTime = DateTime.Now }); context.Images.Add(new ImageModle() { ImageUrl = "~/Images/1343698713w8Epfw.jpg", ImageName = "图片15", HitCount = 1, UploadDateTime = DateTime.Now });  context.SaveChanges(); } }

主页

     主页的构成很简单,中间是个ul列表,右边是点击排行榜,分页主要是利用PagedListPager扩展方法,View和Control如下

ImageMangeEntities ImageDB = new ImageMangeEntities();



        public ActionResult Index(int? page)

        {

            List<ImageModle> model = new List<ImageModle>();

            model = ImageDB.Images.ToList();

            int pagenumber = page ?? 1;

            var retmodel = model.ToPagedList(pagenumber, 12);

            return View(retmodel);

        }

@model IPagedList<MusicStoreTest.Models.ImageModle>

@{

ViewBag.Title = "主页";

}

@using PagedList;

@using PagedList.Mvc;

<h2>图片浏览</h2>



<div style="float: left;">

    <ul id="album-list">

        @foreach (var item in Model)

        {

            <li><a href="@Url.Action("Details", "Image",

                             new {id = item.Id})">



                    <img style="width: 100px; height: 100px" alt="@item.ImageName" src="@Url.Content(@item.ImageUrl)"/>

                    <span >@item.ImageName</span> </a>

            </li>

        }

    </ul>   

</div>

<div style="float:left;">

         @{Html.RenderAction("ImageHitList");}

</div>

 <div  style="vertical-align: middle; clear: both;margin-left: 50px">       

        @Html.PagedListPager((IPagedList) Model, page => Url.Action("Index", new {page = page}))

</div>

点击量计算实现
    要实现同一时间段内不算点击量累计,可以用HttpContext.Session实现,就定30分钟期限吧,30分钟内无操作就可以继续计算点击量,如下

         <sessionState timeout="30"/>

        public ActionResult Details(int id)

        {

            List<ImageModle> model = new List<ImageModle>();

            var item = ImageDB.Images.Find(id);

            var session = HttpContext.Session[id.ToString()];

            if (session == null)

            {

                HttpContext.Session[id.ToString()] = "browseId";

                item.HitCount = item.HitCount + 1;

                ImageDB.Entry(item).State = EntityState.Modified;           

                ImageDB.SaveChanges();

            }



            ViewBag.ImageName = item.ImageName;

            ViewBag.ImageUrl = item.ImageUrl;return View();

        }

上传图片
     还有上传图片功能,要加上[Authorize]特性实现登录后才能上传图片,如下

        [HttpPost]

        [Authorize]

        public JsonResult UploadImage(HttpPostedFileBase image)

        {

            if (image != null)

            {

                string guid =  Guid.NewGuid().ToString();

                string fileName = Path.GetFileName(image.FileName);

                string filePath = Path.Combine(Server.MapPath("~/Files"), guid + "-" + fileName);

                string clientPath = "/Files/" + guid + "-" + fileName;

                image.SaveAs(filePath);

                ImageModle imageModle = new ImageModle();

                imageModle.ImageName =  fileName;

                imageModle.ImageUrl = clientPath;

                imageModle.HitCount = 0;

                imageModle.Uploader = User.Identity.Name;

                imageModle.UploadDateTime=DateTime.Now;

                ImageDB.Images.Add(imageModle);

                ImageDB.SaveChanges();

                return Json(new { success = true, result = clientPath });

            }

            else

            {

                return Json(new { success = false, msg = "上传失败！" });

            }

        }

 

@{

    ViewBag.Title = "UploadImage";

}

<h2 id="ssss">上传图片</h2>

@using (Html.BeginForm("UploadImage", "Image", FormMethod.Post, new { enctype = "multipart/form-data", id = "ImageForm" }))

{

    <img  alt="请上传图片" id="img" width="800" height="500"/>

    <input type="file" id="imageInput" name="image" accept="image/gif,image/jpeg,image/png,gif|jpg|png"/>

    <input type="button" id="btn" value="提交"/>

    <span class="img-msg"></span>

}

@section Scripts {

    <script>

         

        $('#imageInput').change(function () {

            if ($(this).val().length > 0) {

                var file = this.files[0]; 

                var reader = new FileReader();

                reader.onload=function (e)

                {

                    $("#img").attr("src", e.target.result);

                }

                reader.readAsDataURL(file);

            }

        });

    

        $('#btn').click(function () {

            if ($("#imageInput").val().length > 0) {

                alert($("#imageInput").val());

                $('#ImageForm').ajaxSubmit({

                    dataType: 'json',

                    success: function (data) {

                        $('.img-msg').text("");

                        if (data.success) {

                            $("#img").attr("src", data.result);

                        } else {

                            alert(data.msg);

                        }

                    },

                    error: function () {

                        alert("上传失败");

                    },

                    beforeSend: function () {

                        $('.img-msg').text("正在上传，请稍后...");

                    }

                });

            }

        });

    </script>

}

 

小结

     做这么一个网站很简单,熟练的人大概半个小时就可以完成了,但这是入门的必修课.另外,当完成第一个网站时,你就会发现MVC之路才是刚刚开始.