watermark.aspx.vb

一个ASP.net给上传图片加水印的程序,网上有C#版的,本人习惯用VB.net所以就做了一个VB.net版的,您有什么疑问请发送邮件到[e-mail]

Imports System
Imports System.IO
Imports System.Drawing

Public Class WaterMark
    Inherits System.Web.UI.Page

#Region " Web 窗体设计器生成的代码 "

    '该调用是 Web 窗体设计器所必需的。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub
    Protected WithEvents Button1 As System.Web.UI.WebControls.Button
    Protected WithEvents Button2 As System.Web.UI.WebControls.Button
    Protected WithEvents RequiredFieldValidator1 As System.Web.UI.WebControls.RequiredFieldValidator
    Protected WithEvents Image1 As System.Web.UI.WebControls.Image
    Protected WithEvents Label1 As System.Web.UI.WebControls.Label
    Protected WithEvents File1 As System.Web.UI.HtmlControls.HtmlInputFile

    '注意: 以下占位符声明是 Web 窗体设计器所必需的。
    '不要删除或移动它。
    Private designerPlaceholderDeclaration As System.Object

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
        '不要使用代码编辑器修改它。
        InitializeComponent()
    End Sub

#End Region

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        '在此处放置初始化页的用户代码
        If Page.IsPostBack = False Then
            Image1.ImageUrl = "mikepp.gif"
        End If

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If File1.PostedFile.FileName.Trim() <> "" Then
            '上传文件
            Dim extension As String = System.IO.Path.GetExtension(File1.PostedFile.FileName).ToLower()
            Dim fileName As String = DateTime.Now.ToString("yyyyMMddhhmmss")
            Dim path As String = Server.MapPath(".") + "/Downloads/" + fileName + extension
            File1.PostedFile.SaveAs(Path)

            '加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
            Dim image As Image = System.Drawing.Image.FromFile(path)
            Dim g As Graphics = Graphics.FromImage(image)
            g.DrawImage(image, 10, 10, image.Width, image.Height)
            Dim f As Font = New Font("Verdana", 12)
            Dim b As Brush = New SolidBrush(Color.Red)
            Dim addText As String = "3One工作室(http://www.oneoneone.net)"
            g.DrawString(addText, f, b, 10, 10)
            g.Dispose()

            '保存加水印过后的图片,删除原始图片
            Dim newPath As String = Server.MapPath(".") + "/Downloads/" + fileName + "_new" + extension
            image.Save(newPath)
            image.Dispose()
            If File.Exists(path) Then
                File.Delete(path)
            End If

            Image1.ImageUrl = newPath
            'Response.Redirect(newPath)
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        '上传文件
        Dim extension As String = System.IO.Path.GetExtension(File1.PostedFile.FileName).ToUpper()
        Dim fileName As String = DateTime.Now.ToString("yyyyMMddhhmmss")
        Dim path As String = Server.MapPath(".") + "/Downloads/" + fileName + extension
        File1.PostedFile.SaveAs(Path)

        '加图片水印
        Dim Image As Image = System.Drawing.Image.FromFile(path)
        Dim copyImage As Image = System.Drawing.Image.FromFile(Server.MapPath(".") + "/Downloads/logo.png")
        Dim g As Graphics = Graphics.FromImage(Image)
        g.DrawImage(copyImage, New Rectangle(Image.Width - copyImage.Width, Image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel)
        g.Dispose()

        '保存加水印过后的图片,删除原始图片
        Dim newPath As String = Server.MapPath(".") + "/Downloads/" + fileName + "_new" + extension
        Image.Save(newPath)
        Image.Dispose()
        If File.Exists(path) Then
            File.Delete(path)
        End If
        Image1.ImageUrl = newPath

    End Sub
End Class