zoukankan
html css js c++ java
asp.net上传图片并同时生成缩略图
using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; public partial class slt_Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void bt_upload_Click(object sender, EventArgs e) { //检查上传文件的格式是否有效 if (this.UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < 0) { Response.Write("上传图片格式无效!"); return; } //生成原图 Byte[] oFileByte = new byte[this.UploadFile.PostedFile.ContentLength]; System.IO.Stream oStream = this.UploadFile.PostedFile.InputStream; System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream); int oWidth = oImage.Width; //原图宽度 int oHeight = oImage.Height; //原图高度 int tWidth = 100; //设置缩略图初始宽度 int tHeight = 100; //设置缩略图初始高度 //按比例计算出缩略图的宽度和高度 if (oWidth >= oHeight) { tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth))); } else { tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight))); } //生成缩略原图 Bitmap tImage = new Bitmap(tWidth, tHeight); Graphics g = Graphics.FromImage(tImage); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度 g.Clear(Color.Transparent); //清空画布并以透明背景色填充 g.DrawImage(oImage, new Rectangle(0, 0, tWidth, tHeight), new Rectangle(0, 0, oWidth, oHeight), GraphicsUnit.Pixel); string oFullName = Server.MapPath(".") + "/image/" + "o" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存原图的物理路径 string tFullName = Server.MapPath(".") + "/image/" + "t" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存缩略图的物理路径 try { //以JPG格式保存图片 oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg); tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (Exception ex) { throw ex; } finally { //释放资源 oImage.Dispose(); g.Dispose(); tImage.Dispose(); } } }
查看全文
相关阅读:
快速排序
Java LinkedList
Java ArrayList
Java ReentrantLock
Java Timer
Java 管道PipedInputStream PipedOutStream PipedReader PipedWriter
6. Samba服务和防火墙配置笔记
5. 网络配置与FTP服务笔记
3.vi 和软件安装
2 . Linux常见命令
原文地址:https://www.cnblogs.com/javawebsoa/p/2458099.html
最新文章
[bzoj1061][Noi2008]志愿者招募【网络流】【线性规划】
[bzoj1051][HAOI2006]受欢迎的牛【tarjan】
[bzoj1030][JSOI2007]文本生成器【AC自动机】
[bzoj1029][JSOI2007]建筑抢修【贪心】【堆】
Spark各运行模式详解
Shuffle 相关参数配置
Spark Shuffle详解
Spark调度模块
Spark架构
重点:RDD的缓存
热门文章
Shuffle 相关参数配置
面试梳理
Kafka配置
Dom事件探秘
dnspod域名解析设置
使用catsup快速建立个人博客
Java Scanner
求一个10进制正整数转为2进制整数中0和1的个数
Java String和StringBuffer和StringBuilder
Java 16进制转10进制
Copyright © 2011-2022 走看看