下载文件 下载文件

using Console_Core.BLL;
using Console_Core.Model;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Web;

namespace Web_Cassini
{
    /// <summary>
    /// download1 的摘要说明
    /// </summary>
    public class download1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            MyORM_BLL myORM_BLL = new MyORM_BLL();

            #region 默认把当前输出的文件 以附加形式 动态下载 到指定文件中
            //默认把当前输出的文件 以附加形式 动态下载 到指定文件中   --AddHeader把表头输出到输出流
            context.Response.AddHeader("Content-Disposition", "attachment;filename=" + context.Server.UrlDecode("动态文件.txt") + "");
            List<object> list = myORM_BLL.SelectAllModel(typeof(TC_STUDENT));
            foreach (var obj in list)
            {
                TC_STUDENT tc = obj as TC_STUDENT;
                context.Response.Write(tc.USERNAME + "	" + tc.PASSWORD + "	" + tc.GENDER + "	" + tc.PROFESSION);
            } 
            #endregion

            #region 默认把当前Excel 动态的以附件形式 下载
            context.Response.AddHeader("Content-Disposition", "attachment;filename=" + context.Server.UrlEncode("学生信息.xls"));
            List<object> list = myORM_BLL.SelectAllModel(typeof(TC_STUDENT));
            //引用NPOI
            //创建一个workbook
            IWorkbook workbook = new HSSFWorkbook();
            //创建sheet
            ISheet sheet = workbook.CreateSheet("学生信息");
            //遍历List 每一个实例创建一个row
            for (int i = 0; i < list.Count; i++)
            {
                TC_STUDENT tc = list[i] as TC_STUDENT;
                IRow row = sheet.CreateRow(i);
                Type ty = tc.GetType();
                PropertyInfo[] props = ty.GetProperties();
                //遍历 实例中的列 灭一个列创建一个cell
                for (int j = 0; j < props.Length; j++)
                {
                    string propName = props[j].Name;
                    object propValue = props[j].GetValue(tc);
                    ICell cell = row.CreateCell(j);
                    cell.SetCellValue(propValue.ToString());
                }
            }
            //把workbook写入到输出流，并以附件形式下载
            workbook.Write(context.Response.OutputStream); 
            #endregion

            #region 动态的 附加形式 下载图片
            //动态的 附加形式 下载图片
            context.Response.AddHeader("Content-Disposition", "attachment;filename=" + context.Server.UrlEncode("泡妞证.jpg") + "");
            //获得name
            string name = context.Request["name"];
            //画出图片
            using (Bitmap map = new Bitmap(500, 500))
            using (Graphics g = Graphics.FromImage(map))
            using (Font font1 = new Font(System.Drawing.FontFamily.GenericSerif, 30))
            using (Font font2 = new Font(System.Drawing.FontFamily.GenericSerif, 15))
            {
                g.DrawString(name, font1, Brushes.Red, 110, 66);
                g.DrawString(name, font2, Brushes.Red, 302, 150);

                map.Save(context.Response.OutputStream, ImageFormat.Jpeg);
            } 
            #endregion

            #region 通过提取码 动态下载图片
            //获得提取码
            string code = context.Request["code"];
            //验证 提取码
            if (code != "1234")
            {
                context.Response.Write("提取码错误");
                return;
            }
            //获得图片路径 写入流 Copy到输出流
            string path = context.Server.MapPath("~/img/我爱你一万年158_038.jpg");
            using (Stream stream = File.OpenRead(path))
            {
                //html头标记：动态附加形式 下载图片
                context.Response.AddHeader("Content-Disposition", "attachment;filename=" + context.Server.UrlEncode("我爱你一万年158_038.jpg") + "");
                stream.CopyTo(context.Response.OutputStream);
            } 
            #endregion
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace Web_Cassini
{
    /// <summary>
    /// upload1 的摘要说明
    /// </summary>
    public class upload1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            #region 上传文件 保存到本地upload
            //获得上传的文件
            HttpPostedFile file1 = context.Request.Files["file1"];
            HttpPostedFile file2 = context.Request.Files["file2"];
            //验证 文件大小、类型
            if (file1.ContentLength > 1024 * 1024)
            {
                context.Response.Write("文件大小不能超过1M");
                return;
            }
            string fileExt = Path.GetExtension(file1.FileName);
            string fileName = Path.GetFileName(file1.FileName);
            if (fileExt != ".png" && fileExt != ".jpg" && fileExt != ".gif")
            {
                context.Response.Write("只能上传图片");
                return;
            }
            //把文件保存到本地
            string path = context.Server.MapPath("~/upload/") + fileName;
            file1.SaveAs(path); 
            #endregion

            #region 作业：上传图片 保存到upload/yyyy/mm/dd文件下
            //获得上传文件
            string title = context.Request["title"]; //自定义的图片标题
            HttpPostedFile file1 = context.Request.Files["file1"];
            context.Response.Write("<html><head></head><body>"); //起始标签
            //验证 大小和后缀
            if(file1==null || file1.ContentLength<=0)
            {
                context.Response.Write("请先选择文件");
                OutputHtmlEnd(context.Response); //输出结束标签
                return;
            }
            if (file1.ContentLength > 1024 * 1024)
            {
                context.Response.Write("文件不能超过1M");
                OutputHtmlEnd(context.Response); //输出结束标签
                return;
            }
            string fileExt = Path.GetExtension(file1.FileName);
            if (fileExt != ".jpg" && fileExt != ".jpeg" && fileExt != ".gif" && fileExt != ".png")
            {
                context.Response.Write("只能上传图片");
                OutputHtmlEnd(context.Response); //输出结束标签
                return;
            }
            string format = DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day;
            string dirFullPath = context.Server.MapPath("~/upload/" + format + "/"); //目录全路径
            string fileFullPath =Path.Combine(dirFullPath,file1.FileName); //文件全路径
            //画出图片 保存到upload （文件不落地，从流中获得图片）
            using (Image img = Bitmap.FromStream(file1.InputStream))
            {
                using (Graphics g = Graphics.FromImage(img))
                using (Font font = new Font(System.Drawing.FontFamily.GenericSerif, 20))
                {
                    g.DrawString(title, font, Brushes.Red, 0, 0);
                }
                if (!Directory.Exists(dirFullPath))
                {
                    Directory.CreateDirectory(dirFullPath);
                }
                img.Save(fileFullPath);
                context.Response.Write("ok");
                OutputHtmlEnd(context.Response);
            } 
            #endregion

            #region 作业：上传excel文件 web展示内容
            //上传excel文件 web展示内容
            //获得excel文件
            HttpPostedFile file1 = context.Request.Files["file1"];
            //验证 非空、大小和后缀
            context.Response.Write("<html><head></head><body>"); //起始标签
            if (file1 == null || file1.ContentLength <= 0)
            {
                context.Response.Write("还未选择文件");
                OutputHtmlEnd(context.Response); //html结束标签
                return;
            }
            if (file1.ContentLength > 1024 * 1024)
            {
                context.Response.Write("文件不能超过1M");
                OutputHtmlEnd(context.Response); //html结束标签
                return;
            }
            string fileExt = Path.GetExtension(file1.FileName);
            if (fileExt != ".xls" && fileExt != ".xlsx")
            {
                context.Response.Write("只能上传excel文件");
                OutputHtmlEnd(context.Response); //html结束标签
                return;
            }
            //创建一个workbook 拼接html
            StringBuilder sb = new StringBuilder();
            IWorkbook workbook = new HSSFWorkbook(file1.InputStream);
            //IWorkbook workbook = WorkbookFactory.Create(file1.InputStream); //只在2.0中支持
            for (int i = 0; i < workbook.NumberOfSheets; i++)
            {
                ISheet sheet = workbook.GetSheetAt(i);
                context.Response.Write("<h1>" + sheet.SheetName + "</h1>");
                sb.AppendLine("<table>");
                for (int j = 0; j < sheet.LastRowNum; j++)
                {
                    IRow row = sheet.GetRow(j);
                    sb.AppendLine("<tr>");
                    for (int k = 0; k < row.LastCellNum; k++)
                    {
                        ICell cell = row.GetCell(k);
                        string value = cell.StringCellValue;
                        sb.Append("<td>");
                        sb.Append(value);
                        sb.Append("</td>");
                    }
                    sb.AppendLine("</tr>");
                }
                sb.AppendLine("</table>");
            }
            context.Response.Write(sb.ToString());
            OutputHtmlEnd(context.Response);
            #endregion
        }

        /// <summary>
        /// 输出html结束标签
        /// </summary>
        /// <param name="httpResponse"></param>
        private void OutputHtmlEnd(HttpResponse httpResponse)
        {
            httpResponse.Write("</body></html>");
        }


        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}