图片水印

 

namespace 文字水印高级.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult show()
        {
            return View();
        }
        public ActionResult tupian()
        {
            var file = Request.Files[0];//var s=s.Substring(0)
            var filename = Server.MapPath("~/upload/");
            if (!System.IO.Directory.Exists(filename))
            {
                System.IO.Directory.CreateDirectory(filename);
            }
            var fileaddress = filename + file.FileName;
            file.SaveAs(fileaddress);
            Session["tupian"] = "/upload/" + file.FileName;
            Session["tupian2"]= filename+ file.FileName;
            return Content("<script>alert('上传成功！');location.href='/Home/show'</script>");
        }
        public ActionResult shuiyin(string text)
        {
            string fileaddress = Session["tupian2"].ToString();
            var filename = Server.MapPath("~/upload/");
            Image img = Image.FromFile(fileaddress);
            Graphics g = Graphics.FromImage(img);
            Font font = new Font("宋体", 26);
            SizeF sf = new SizeF();
            SolidBrush solid = new SolidBrush(Color.Red);
            string name = text;
            g.DrawString(text, font, solid, new PointF(img.Width / 5, img.Height / 2));
            img.Save(filename + "666.jpg", ImageFormat.Jpeg);
            Session["tupian"] = "/upload/" + "666.jpg";
            Session["tupian2"]= filename+ "666.jpg";
            return Content("<script>alert('添加水印成功！');location.href='/Home/show'</script>");
        }
        public ActionResult daochu()
        {
            string fileaddress = Session["tupian2"].ToString();
            FileStream fs = new FileStream(fileaddress, FileMode.Open);
            byte[] bytes = new byte[(int)fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(fileaddress));
            Response.BinaryWrite(bytes);
            Response.Flush();
            Response.End();
            return Content("<script>alert('导出成功！');location.href='/Home/show'</script>");
        }
    }
}