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asp.net多图片上传实现程序代码

2017年12月12日  | 移动技术网IT编程  | 我要评论

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前台代码如下：
复制代码 代码如下:

<% @ page language="c#" codefile="uploadimg.aspx.cs" inherits="netadmin_apicture_uploadimg" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
<script type="text/javascript">
var i=1
function addfile()
{
if (i<8)
{var str = '<br> <input type="file" name="file" runat="server" style="width: 300px"/>描述:<input name="text" type="text" style="width: 150px" maxlength="20" />'
document.getelementbyid('myfile').insertadjacenthtml("beforeend",str)
}
else
{
alert("您一次最多只能上传8张图片!")
}
i++
}
</script>
<link href="http://www.hzhuti.com/" rel="stylesheet" type="text/css" />
</head>
<body style="background-image: url(../images/bg.jpg); text-align: center">
<form id="form1" runat="server">
<div>
<table id="table1" align="center" border="0" cellpadding="1" cellspacing="1" class="table"
style="height: 58px" width="620">
<tr>
<td align="center" background="../images/topbg1.jpg">
<font color="#0000ff" face="宋体" size="3"><strong>上传图片</strong></font></td>
</tr>
<tr>
<td align="center">
</td>
</tr>
<tr>
<td align="center">
<asp:panel id="panel5" runat="server" width="608px">
<table width="100%">
<tr>
<td align="right" style="width: 100px">
</td>
<td align="left">
说明:点增加图片按钮可一次上传多张图片,可为每张图片写上一句不超过20个字的描述.单张图片大小不大于1024k</td>
</tr>
<tr>
<td align="right" style="width: 100px">
请选择图片:<br />
</td>
<td align="left"><p id="myfile"><input onclick="addfile()" type="button" value="增加图片(add)"><br />
<input type="file" name="file" runat="server" style="width: 300px"/>
描述:<input name="text" type="text" style="width: 150px" maxlength="20" />
</td>
</tr>
<tr>
<td align="right" style="width: 100px">
上传到的图库:</td>
<td align="left">
<asp:dropdownlist id="ddlalbum" runat="server" datasourceid="sqldatasource1"
datatextfield="albumname" datavaluefield="albumid">
</asp:dropdownlist><asp:sqldatasource id="sqldatasource1" runat="server" connectionstring="<%$ connectionstrings:webjakecs %>"
selectcommand="select [albumid], [albumname] from [wb_album] order by [albumid] desc">
</asp:sqldatasource>
</td>
</tr>
<tr>
<td align="right" style="width: 100px">
</td>
<td align="left">
<asp:button id="btnupload" runat="server" text="开始上传" onclick="btnupload_click" />
</td>
</tr>
<tr>
<td align="right" style="width: 100px">
</td>
<td align="left">
<asp:label id="lblmessage" runat="server" font-bold="true" forecolor="red"></asp:label></td>
</tr>
</table>
</asp:panel>
</td>
</tr>
<tr>
<td align="center">
<font face="宋体"></font><font face="宋体"> </font>
</td>
</tr>
<tr>
<td align="center">
<font face="宋体"></font>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

后台代码如下：
复制代码 代码如下:

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.io;
public partial class netadmin_apicture_uploadimg : system.web.ui.page
...{
protected void page_load(object sender, eventargs e)
...{
}
protected void btnupload_click(object sender, eventargs e)
...{
lblmessage.text = "";
lblmessage.visible = false;
system.web.httpfilecollection files = system.web.httpcontext.current.request.files;
system.text.stringbuilder strmsg = new system.text.stringbuilder("");
string[] rd = request.form[1].split(',');//获得图片描述的文本框字符串数组,为对应的图片的描述
string albumid=ddlalbum.selectedvalue.trim();
int ifile;
for (ifile = 0; ifile < files.count; ifile++)
...{
if (files[ifile].filename.length > 0)
...{
system.web.httppostedfile postedfile = files[ifile];
if (postedfile.contentlength / 1024 > 1024)//单个文件不能大于1024k
...{
strmsg.append(path.getfilename(postedfile.filename) + "---不能大于1024k<br>");
break;
}
string fex = path.getextension(postedfile.filename);
if (fex != ".jpg" && fex != ".jpg" && fex != ".gif" && fex != ".gif")
...{
strmsg.append(path.getfilename(postedfile.filename) + "---图片格式不对,只能是jpg或gif<br>");
break;
}
}
}
if (strmsg.length <= 0)//说明图片大小和格式都没问题
...{
//以下为创建图库目录
string dirname = "pic00" + ddlalbum.selectedvalue.trim();
string dirpath = server.mappath("http://www.iiwnet.com/php");
dirpath = dirpath + "" + dirname;
if (directory.exists(dirpath) == false)
...{
directory.createdirectory(dirpath);
}
random ro = new random();
int name = 1;
for (int i = 0; i < files.count; i++)
...{
system.web.httppostedfile myfile = files[i];
string filename = "";
string fileextention = "";
string picpath = "";
filename = system.io.path.getfilename(myfile.filename);
string stro=ro.next(100,100000000).tostring()+name.tostring();//产生一个随机数用于新命名的图片
string newname =datetime.now.minute.tostring() + datetime.now.second.tostring()+datetime.now.millisecond.tostring()+stro;
if (filename.length > 0)//有文件才执行上传操作再保存到数据库
...{
fileextention = system.io.path.getextension(myfile.filename);
string ppath = dirpath + "" + newname + fileextention;
myfile.saveas(ppath);
string fjname = filename;
picpath = "picbase" + "" + dirname + "" + newname + fileextention;
}
addpicture(picpath, rd[i], albumid);//将图片信息保存到数据库
if (name == 1)//如果为每次更新的第一张图片,则将它更新为象册的封面
...{
upfirstimg(albumid, picpath);
}
name = name + 1;//用来重命名规则的变量
}
}
else
...{
lblmessage.text = strmsg.tostring();
lblmessage.visible = true;
}
}
private void addpicture(string imgpath,string imgnote,string albumid)
...{
string sql = "insert wb_albumimges(imgpath,imgnote,albumid) values('"+imgpath+"','"+imgnote+"','"+albumid+"')";
db mydb = new db();
mydb.runproc(sql);
}
private void upfirstimg(string albumid,string firstimg)
...{
string sql = "update wb_album set firstimg='"+firstimg+"' where albumid="+albumid;
db mydb = new db();
mydb.runproc(sql);
}
}

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