asp.net利用一般处理程序获取用户上传的图片，上传图片利用的layui
前台页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="CacheTest.WebForm2" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> //需要引入layui需要的css和js文件 <link href="layui/css/layui.css" rel="stylesheet" /> <script src="layui/layui.js"></script> <script> layui.use('upload', function () { var $ = layui.jquery, upload = layui.upload; //普通图片上传 var uploadInst = upload.render({ elem: '#test1', url: '一般处理程序', auto: false, BindAction: "#按钮", choose: function(ohj) {//点击上传前预览 //预读本地文件示例，不支持ie8 obj.preview(function (index, file, result) { $('#demo1').attr('src', result); //图片链接（base64） }); }， before: function (obj) { //预读本地文件示例，不支持ie8 obj.preview(function (index, file, result) { $('#demo1').attr('src', result); //图片链接（base64） }); }, done: function (res) {//完成事件 //如果上传失败 if (res.code > 0) { return layer.msg('上传失败'); } //上传成功 }, error: function () { //演示失败状态，并实现重传 var demoText = $('#demoText'); demoText.html( '<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-mini demo-reload">重试</a>'); demoText.find('.demo-reload').on('click', function () { uploadInst.upload(); }); } }); }) </script> </head> <body> <form id="form1"> <fieldset class="layui-elem-field layui-field-title" style="margin-top: 30px;"> <legend>常规使用：普通图片上传</legend> </fieldset> <div class="layui-upload"> <button type="button" class="layui-btn" id="test1">上传图片</button> <div class="layui-upload-list"> <img class="layui-upload-img" id="demo1" style="200px"> <p id="demoText"></p> </div> </div> </form> </body> </html>
一般处理程序
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Web; namespace WebApplication1 { /// <summary> /// Handler1 的摘要说明 /// </summary> public class Handler1 : IHttpHandler { string fileNameNo = ""; string DirectoryName = ""; string Extension = ""; string fileName = ""; string fullPath = ""; string uploadDown = ""; string savePath = ""; string netPath = ""; string parm = ""; StringBuilder msg = new StringBuilder(); public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string physicalPath = System.Web.HttpContext.Current.Server.MapPath("/Upload/"); //parm = context.Request.QueryString["id"].ToString(); HttpFileCollection hfc = context.Request.Files; if (hfc.Count > 0) { HttpPostedFile hpf = context.Request.Files[0]; if (hpf.ContentLength > 0) { //获取文件名和扩展名 fileNameNo = Path.GetFileName(hpf.FileName); //获取文件所在目录 DirectoryName = Path.GetDirectoryName(hpf.FileName); //获取扩展名 Extension = Path.GetExtension(hpf.FileName); if (AvailableFileType(Extension)) //文件格式符合 { if (hpf.ContentLength <= 1024 * 1024 * 4) //文件大小符合 { //获取文件名（不包括扩展名） fileName = Path.GetFileNameWithoutExtension(hpf.FileName); string newFileName = Guid.NewGuid().ToString().Replace("-", "") + Extension; uploadDown = physicalPath + newFileName; netPath = "../upload/" + newFileName; savePath = Path.Combine(physicalPath, newFileName); hpf.SaveAs(savePath); msg.Append( "{"isok":"true","username":"","createtime":"","message":"上传成功","sourcefilename":"" + context.Request.RawUrl + "","netfilename":"" + netPath + "","fileid":"" + newFileName + ""}"); context.Response.Write(msg.ToString()); //获取文件的绝对路径 //string fullPath = Path.GetFullPath(FileUploadImg.PostedFile.FileName); ////获取文件所在地分区 //string PathRoot = Path.GetPathRoot(FileUploadImg.PostedFile.FileName); } else { msg.Append( "{"isok":"false","username":"","createtime":"","message":"上传失败,上传文档不能大于4MB！","sourcefilename":"","netfilename":"","fileid":""}"); context.Response.Write(msg.ToString()); } } else //文件格式不符合 { msg.Append( "{"isok":"false","username":"","createtime":"","message":"文件格式不支持，支持bmp,jpg,gif,png,rar,zip,doc,xls,docx,xlsx格式的上传！","sourcefilename":"","netfilename":"","fileid":""}"); context.Response.Write(msg.ToString()); } } else { msg.Append( "{"isok":"false","username":"","createtime":"","message":"请选择上传的文件","sourcefilename":"","netfilename":""}"); context.Response.Write(msg.ToString()); } } else { msg.Append( "{"isok":"false","username":"","createtime":"","message":"请选择上传的文件","sourcefilename":"","netfilename":""}"); context.Response.Write(msg.ToString()); } } public bool AvailableFileType(string temp) { string[] TypeBag = { ".bmp", ".jpg", ".gif", ".png", ".rar", ".zip", ".doc", ".xls", ".docx", ".xlsx" }; if (Array.IndexOf(TypeBag, temp) == -1) return false; else return true; } public bool IsReusable { get { return false; } } } }