1 <form id=
"form1" runat=
"server">
2 <div>
3 文件名：<asp:TextBox ID=
"TextBox1" runat=
"server"></asp:TextBox>
4 <asp:Image ID=
"Image1" runat=
"server" />
5 <asp:FileUpload ID=
"FileUpload1" runat=
"server" />
6 <asp:Button ID=
"Button1" runat=
"server" Text=
"上传" OnClick=
"Button1_Click" />
7 </div>
8 </form>
9
10
11
12 protected void Button2_Click(
object sender, EventArgs e)
13 {
14 if (FileUpload1.HasFile)
15 {
16 HttpPostedFile hf =
FileUpload1.PostedFile;
17 string filename = hf.FileName;
//全路径：F:\asp\456.jpg
18 string fname = Path.GetFileName(filename);
//文件名：456
19 string ext = Path.GetExtension(fname).ToLower();
//获取拓展名:.jpg
20 Response.Write(fname +
"<br/>" +
ext);
21 string[] exts = {
".jpg",
".jpeg",
".png",
".bmp",
".gif" };
22 bool tag =
false;
23 foreach (
string item
in exts)
24 {
25 if (item ==
ext)
26 {
27 tag =
true;
28 break;
29 }
30 }
31 if (tag)
32 {
33 if (hf.ContentLength <
1024 *
1024)
34 {
35 string uppath =
"upload/";
36 string dir = DateTime.Now.Year +
"/" + DateTime.Now.Month +
"/" +
DateTime.Now.Day;
37 string dirpath = Server.MapPath(uppath +
dir);
38 if (!
Directory.Exists(dirpath))
39 {
40 Directory.CreateDirectory(dirpath);
41 }
42 if (TextBox1.Text !=
"")
43 {
44 fname = TextBox1.Text +
ext;
45 }
46 hf.SaveAs(dirpath +
fname);
47 Image1.ImageUrl = uppath + dir +
fname;
48 Image1.Width =
400;
49 Image1.Height =
300;
50 }
51 else
52 {
53 Response.Write(
"<script>alert('上传文件太大')</script>");
54 }
55 }
56 }
57 else
58 {
59 Response.Write(
"<script>alert('选择上传文件')</script>");
60 }
61 }
62
63
64
65
66 ----------------------------------------------------------------------------------------------------------------------------------
67 <form id=
"form1" runat=
"server">
68 <div>
Upload
69 <asp:Image ID=
"Image1" runat=
"server" /></br>
70 <span style=
"color:#4cff00" >图片预览</span></br>
71 <asp:TextBox ID=
"txtCover" runat=
"server" ReadOnly=
"true"></asp:TextBox></br>
72 <span style=
"color:#4cff00" >图片上传的路径</span></br>
73 <asp:FileUpload ID=
"imgupload" runat=
"server" /> &
nbsp;
74 <asp:Button ID=
"btnUpload" runat=
"server" Text=
"上传" OnClick=
"btnUpload_Click" />
75
76 </div>
77 </form>
78
79 protected void btnUpload_Click(
object sender, EventArgs e)
80 {
81 #region
82 //是否有文件加载
83 if (imgupload.PostedFile.FileName !=
"")
//不为空，证明有文件上传
84 {
85 //获取图片路径和文件名 imgPath=本地路径\\本地二级路径\\文件名.扩展名
86 string imgPath = imgupload.PostedFile.FileName;
//imgPath=D:\Image\Group$)91{Y9@Q(R@7@2M6APE_ZI.png
87 //截取图片扩展名 +1？？？“1”是什么含义
88 string extPath = imgPath.Substring(imgPath.LastIndexOf(
".") +
1);
//png jpg bmp
89 //判断文件类型 为什么要用装换大小写？ToLower
90 if (extPath.ToLower() !=
"bmp" && extPath.ToLower() !=
"jpg" && extPath.ToLower() !=
"png")
91 {
92 Page.ClientScript.RegisterClientScriptBlock(GetType(),
"",
"<script language=javascript>alert('选择文件类型JPG，bmp，PNG')</script>");
93
94 }
95 else
96 {
97 //思路：1.先定义好物理路径（文件 要保存到的文件夹）2.sPath+上传图片的xx+.jpg
98 // 得到服务器的上传路径
99 string sPath = Server.MapPath(
"/UploadFiles/upload");
// MapPath物理路径就是右斜/
100 //保存到服务器 sPath＝\UploadFiles\upload
101 imgupload.PostedFile.SaveAs(sPath +
@"\" + imgPath.Substring(imgPath.LastIndexOf(
@"\") +
1));
//存储虚拟路径+图片名字
102 sPath = sPath.Substring(sPath.LastIndexOf(
@"\") +
1);
//sPath = 截取文件夹里的upload;
103 //在这里Spath被重置为\upload
104 // 接下来就是要在TxtBox中显示路径
105 this.txtCover.Text = sPath +
"/" + imgPath.Substring(imgPath.LastIndexOf(
@"\") +
1);
//文件夹里的upload+xx.jpg;
106 // 这里txtCover的值为upload文件名.扩展名
107 Page.ClientScript.RegisterClientScriptBlock(GetType(),
"",
"<script language=javascript>alert('上传成功')</script>");
108 Image1.ImageUrl =
"/UploadFiles/" +
this.txtCover.Text;
//?upload/$@B0)U`]TDA@MKRDW15BJQR.jpg
109 }
110 }
111
112 else
113 {
114 Page.ClientScript.RegisterClientScriptBlock(GetType(),
"",
"<script language=javascript>alert('请选择图片')</script>");
115 }
116 #endregion
转载于:https://www.cnblogs.com/ZkbFighting/p/8138297.html
