MVC学习之六_____上传单张图片
程序员文章站
2022-03-12 21:39:10
...
模板页代码：
后台代码：
参考：https://www.cnblogs.com/sharealex/articles/8086595.html
原博客中还有删除及查看的方法，可自己学习
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>上传图片</title>
</head>
<body>
<div>
<div class="leftImage">
<input type="file" id="picAjax" class="customButton" />
<span id="uploadInfo"></span>
<input type="button" id="submitPic" class="customButton" value="上传" />
</div>
<div class="rightImage">
<img id="selImg" src="" alt="" />
</div>
</div>
<script type="text/javascript" src="~/Scripts/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
//选择图片事件
var picString = "";
var id = 11;
$("#picAjax").change(function (e) {
var file = e.delegateTarget.files[0];
if (file.type == 'image/jpeg' || file.type == 'image/png') {
$("#uploadInfo").text("图片格式正确，请点击提交按钮");
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (ret)
{
picString = reader.result;
//预览图片
$("#selImg").attr({ "src": picString });
}
}
else {
$("#uploadInfo").text("请上传jpg或png格式的图片！");
}
});
//上传图片事件
$("#submitPic").click(function () {
if (picString != "") {
$.ajax("../BasicData/UploadPhoto", {
type: "post",
datatype: "json",
data: {
picString:picString,
id:id
},
error: function () { },
success: function (result) {
if (result.suc == true) {
$("#uploadInfo").text("图片上传成功！");
$("#ImageList").empty();
ReadPicture();
}
}
});
}
});
</script>
</body>
</html>
后台代码：
#region 模板页视图
public ActionResult UploadPhoto()
{
return View();
}
#endregion
#region 接收上传图片
[HttpPost]
public ActionResult UploadPhoto(string picString, string id)
{
var tmpArr = picString.Split(',');
byte[] bytes = Convert.FromBase64String(tmpArr[1]);
MemoryStream ms = new MemoryStream(bytes);
ms.Write(bytes, 0, bytes.Length);
var img = Image.FromStream(ms, true);
var path = System.AppDomain.CurrentDomain.BaseDirectory;
var imagesPath = System.IO.Path.Combine(path, @"Uploads\AgrCorporations\" + id + "\\");
if (!System.IO.Directory.Exists(imagesPath))
System.IO.Directory.CreateDirectory(imagesPath);
string fileName = DateTime.Now.ToString("yyyyMMddHHmmss_ffff", System.Globalization.DateTimeFormatInfo.InvariantInfo) + ".png";
var bitImage = GetThumbnailImage(img, 400, 300);
bitImage.Save(imagesPath + fileName);
bool isOk = true;
string msg = imagesPath + fileName;
return Json(new { suc = isOk, msg = msg });
}
#endregion
#region 图片压缩方法
/// <summary>
/// 图片压缩方法
/// </summary>
/// <param name="srcImage">Image图片</param>
/// <param name="width">要压缩的图片宽</param>
/// <param name="height">要压缩的图片高</param>
/// <returns></returns>
private static Image GetThumbnailImage(Image srcImage, int width, int height)
{
Image bitmap = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(srcImage, new Rectangle(0, 0, width, width),
new Rectangle(0, 0, srcImage.Width, srcImage.Height),
GraphicsUnit.Pixel);
return bitmap;
}
#endregion
参考：https://www.cnblogs.com/sharealex/articles/8086595.html
原博客中还有删除及查看的方法，可自己学习