MVC快速构建一个图片浏览网站
Posted 超越梦想
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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.
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