普通文件的上传(表单上传和ajax文件异步上传)

一.表单上传:

html客户端部分:

<form action="upload.ashx" method="post" enctype="multipart/form-data"> 选择文件:<input type="file" name="file1" /><br /> <input type="submit" value="上传" /> </form>

一般处理程序服务器端:

public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; HttpPostedFile file1 = context.Request.Files["file1"]; helper.uploadFile(file1, "~/upload/");//这里就是对相应方法进行调用 context.Response.Write("ok");//提示执行成功 }

上传代码的封装:

/// <summary>
        /// 上传图片
        /// </summary>
        /// <param name="file">通过form表达提交的文件</param>
        /// <param name="virpath">文件要保存的虚拟路径</param> public static void uploadImg(HttpPostedFile file,string virpath) { if (file.ContentLength > 1024 * 1024 * 4) { throw new Exception("文件不能大于4M"); } string imgtype = Path.GetExtension(file.FileName); if(imgtype!=".jpg"&&imgtype!=".jpeg") //图片类型进行限制 { throw new Exception("请上传jpg或JPEG图片"); } using (Image img = Bitmap.FromStream(file.InputStream)) { string savepath = HttpContext.Current.Server.MapPath(virpath+file.FileName); img.Save(savepath); } } /// <summary> /// 上传文件 /// </summary> /// <param name="file">通过form表达提交的文件</param> /// <param name="virpath">文件要保存的虚拟路径</param> public static void uploadFile(HttpPostedFile file, string virpath) { if (file.ContentLength > 1024 * 1024 * 6) { throw new Exception("文件不能大于6M"); } string imgtype = Path.GetExtension(file.FileName); //imgtype对上传的文件进行限制 if (imgtype != ".zip" && imgtype != ".mp3") { throw new Exception("只允许上传zip、rar....文件"); } string dirFullPath= HttpContext.Current.Server.MapPath(virpath); if (!Directory.Exists(dirFullPath))//如果文件夹不存在,则先创建文件夹 { Directory.CreateDirectory(dirFullPath); } file.SaveAs(dirFullPath + file.FileName); }

二.Ajax文件异步上传:

注明:既然有了表单上传为什么又要ajax上传呢?因为表单上传过程中,整个页面就刷新了!ajax异步上传就可以达到只刷新局部位置,下面就简单看看ajax上传吧!

html客户端部分:

<head> 
<script src="jquery-2.1.4.js"></script> <script> $(function () { $("#upload").click(function () { $("#imgWait").show(); var formData = new FormData(); formData.append("myfile", document.getElementById("file1").files[0]); $.ajax({ url: "upload.ashx", type: "POST", data: formData, /** *必须false才会自动加上正确的Content-Type */ contentType: false, /** * 必须false才会避开jQuery对 formdata 的默认处理 * XMLHttpRequest会对 formdata 进行正确的处理 */ processData: false, success: function (data) { if (data.status == "true") { alert("上传成功!"); } if (data.status == "error") { alert(data.msg); } $("#imgWait").hide(); }, error: function () { alert("上传失败!"); $("#imgWait").hide(); } }); }); }); </script> </head> <body> 选择文件:<input type="file" id="file1" /><br /> <input type="button" id="upload" value="上传" /> <img src="wait.gif" style="display:none" id="imgWait" /> </body>

一般处理程序服务器端:

public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; if (context.Request.Files.Count > 0) { HttpPostedFile file1 = context.Request.Files["myfile"]; helper.uploadFile(file1, "~/upload/"); //这里引用的是上面封装的方法 WriteJson(context.Response, "true", ""); } else { WriteJson(context.Response, "error", "请选择要上传的文件"); } }

json代码封装:

public static void WriteJson(HttpResponse response, string status1, string msg1, object data1 = null) { response.ContentType = "application/json"; var obj = new { status = status1, msg = msg1, data = data1 }; string json = new JavaScriptSerializer().Serialize(obj); response.Write(json); }

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转载自www.cnblogs.com/samve/p/10023252.html