ASP.NET中常用功能代码总结（5）——文件操作篇
posted @ 2005-12-02 11:19 Chandler.C 阅读(222) 评论(1) 编辑
2005年12月2日 #
ASP.NET中常用功能代码总结（2）——生成验证图片
ASP.NET中常用功能代码总结（2）——生成验证图片
整理：Terrylee
生成随机的验证图片
使用方法：
1
/**////调用函数将验证码生成图片
2
this.CreateCheckCodeImage(GenerateCheckCode());
/**////调用函数将验证码生成图片2
this.CreateCheckCodeImage(GenerateCheckCode()); 1/**//// <summary>
2
/// 产生五位的随机字符串
3 /// </summary>
4
/// <returns></returns>
5 private string GenerateCheckCode()
6 
{
7 int number;
8 char code;
9 string checkCode = String.Empty;
10
11 System.Random random = new Random();
12
13 for (int i = 0; i < 5; i++)
14
{
15 number = random.Next();
16
17 if (number % 2 == 0)
18 code = (char)('0' + (char)(number % 10));
19 else
20 code = (char)('A' + (char)(number % 26));
21
22 checkCode += code.ToString();
23
}
24
25 /**////用于客户端校验码比较
26 Session["CheckCode"] = checkCode;
27
28 return checkCode;
29 }
30
31 /**//// <summary>
32 /// 将验证码生成图片显示
33 /// </summary>
34 /// <param name="checkCode"></param>
35 private void CreateCheckCodeImage(string checkCode)
36 {
37 if (checkCode == null || checkCode.Trim() == String.Empty)
38 return;
39
40 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
41 Graphics g = Graphics.FromImage(image);
42
43 try
44 {
45 /**////生成随机生成器
46 Random random = new Random();
47
48 /**////清空图片背景色
49 g.Clear(Color.White);
50
51 /**////画图片的背景噪音线
52 for (int i = 0; i < 25; i++)
53 {
54 int x1 = random.Next(image.Width);
55 int x2 = random.Next(image.Width);
56 int y1 = random.Next(image.Height);
57 int y2 = random.Next(image.Height);
58
59 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
60 }
61
62 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
63 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
64 g.DrawString(checkCode, font, brush, 2, 2);
65
66 /**////画图片的前景噪音点
67 for (int i = 0; i < 100; i++)
68 {
69 int x = random.Next(image.Width);
70 int y = random.Next(image.Height);
71
72 image.SetPixel(x, y, Color.FromArgb(random.Next()));
73 }
74
75 /**////画图片的边框线
76 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
77
78 System.IO.MemoryStream ms = new System.IO.MemoryStream();
79 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
80 Response.ClearContent();
81 Response.ContentType = "image/Gif";
82 Response.BinaryWrite(ms.ToArray());
83 }
84 finally
85 {
86 g.Dispose();
87 image.Dispose();
88 }
89 }
/**//// <summary>2
/// 产生五位的随机字符串3
/// </summary>4
/// <returns></returns>5
private string GenerateCheckCode()6
{ 7
int number;8
char code;9
string checkCode = String.Empty;10
11
System.Random random = new Random();12
13
for (int i = 0; i < 5; i++)14
{15
number = random.Next();16
17
if (number % 2 == 0)18
code = (char)('0' + (char)(number % 10));19
else20
code = (char)('A' + (char)(number % 26));21
22
checkCode += code.ToString();23
}24
25
/**////用于客户端校验码比较26
Session["CheckCode"] = checkCode;27
28
return checkCode;29
}30
31
/**//// <summary>32
/// 将验证码生成图片显示33
/// </summary>34
/// <param name="checkCode"></param>35
private void CreateCheckCodeImage(string checkCode)36
{ 37
if (checkCode == null || checkCode.Trim() == String.Empty)38
return;39
40
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);41
Graphics g = Graphics.FromImage(image);42
43
try44
{45
/**////生成随机生成器 46
Random random = new Random();47
48
/**////清空图片背景色 49
g.Clear(Color.White);50
51
/**////画图片的背景噪音线 52
for (int i = 0; i < 25; i++)53
{54
int x1 = random.Next(image.Width);55
int x2 = random.Next(image.Width);56
int y1 = random.Next(image.Height);57
int y2 = random.Next(image.Height);58
59
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);60
}61
62
Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));63
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);64
g.DrawString(checkCode, font, brush, 2, 2);65
66
/**////画图片的前景噪音点 67
for (int i = 0; i < 100; i++)68
{69
int x = random.Next(image.Width);70
int y = random.Next(image.Height);71
72
image.SetPixel(x, y, Color.FromArgb(random.Next()));73
}74
75
/**////画图片的边框线 76
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);77
78
System.IO.MemoryStream ms = new System.IO.MemoryStream();79
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);80
Response.ClearContent();81
Response.ContentType = "image/Gif";82
Response.BinaryWrite(ms.ToArray());83
}84
finally85
{86
g.Dispose();87
image.Dispose();88
}89
}posted @ 2005-12-02 11:18 Chandler.C 阅读(331) 评论(1) 编辑
ASP.NET中常用功能代码总结（3）——上传图片到数据库
ASP.NET中常用功能代码总结（3）——上传图片到数据库
整理：Terrylee
一．上传图片到数据库
1/**//// <summary>
2/// 上传图片
3/// </summary>
4private void UploadFile()
5{
6 /**////得到用户要上传的文件名
7 string strFilePathName = loFile.PostedFile.FileName;
8 string strFileName = Path.GetFileName(strFilePathName);
9 int FileLength = loFile.PostedFile.ContentLength;
10
11 if(FileLength<=0)
12 return;
13
14 /**////上传文件
15 try
16 {
17
18 /**////图象文件临时储存Byte数组
19 Byte[] FileByteArray = new Byte[FileLength];
20
21 /**////建立数据流对像
22 Stream StreamObject = loFile.PostedFile.InputStream;
23
24 /**////读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度
25 StreamObject.Read(FileByteArray,0,FileLength);
26
27 /**////建立SQL Server链接
28 string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
29 SqlConnection Con = new SqlConnection(strCon);
30 String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)";
31 SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
32 CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).Value = FileByteArray;
33 CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).Value = loFile.PostedFile.ContentType; //记录文件类型
34
35 /**////把其它单表数据记录上传
36 CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).Value = tbDescription.Text;
37
38 /**////记录文件长度，读取时使用
39 CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).Value = FileLength;
40 Con.Open();
41 CmdObj.ExecuteNonQuery();
42 Con.Close();
43
44 /**////跳转页面
45 Response.Redirect("ShowAll.aspx");
46 }
47 catch(Exception ex)
48 {
49 throw ex;
50 }
51}
/**//// <summary>2
/// 上传图片3
/// </summary>4
private void UploadFile()5
{6
/**////得到用户要上传的文件名7
string strFilePathName = loFile.PostedFile.FileName;8
string strFileName = Path.GetFileName(strFilePathName);9
int FileLength = loFile.PostedFile.ContentLength;10
11
if(FileLength<=0)12
return;13
14
/**////上传文件15
try16
{17
18
/**////图象文件临时储存Byte数组19
Byte[] FileByteArray = new Byte[FileLength];20
21
/**////建立数据流对像22
Stream StreamObject = loFile.PostedFile.InputStream; 23
24
/**////读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度25
StreamObject.Read(FileByteArray,0,FileLength); 26
27
/**////建立SQL Server链接28
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];29
SqlConnection Con = new SqlConnection(strCon);30
String SqlCmd = "INSERT INTO ImageStore (ImageData, ImageContentType, ImageDescription, ImageSize) VALUES (@Image, @ContentType, @ImageDescription, @ImageSize)";31
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);32
CmdObj.Parameters.Add("@Image",SqlDbType.Binary, FileLength).Value = FileByteArray;33
CmdObj.Parameters.Add("@ContentType", SqlDbType.VarChar,50).Value = loFile.PostedFile.ContentType; //记录文件类型34
35
/**////把其它单表数据记录上传36
CmdObj.Parameters.Add("@ImageDescription", SqlDbType.VarChar,200).Value = tbDescription.Text;37
38
/**////记录文件长度，读取时使用39
CmdObj.Parameters.Add("@ImageSize", SqlDbType.BigInt,8).Value = FileLength;40
Con.Open();41
CmdObj.ExecuteNonQuery(); 42
Con.Close();43
44
/**////跳转页面45
Response.Redirect("ShowAll.aspx");46
}47
catch(Exception ex)48
{49
throw ex;50
}51
}二．从数据库中读取图片
1/**//// <summary>
2/// 显示图片
3/// </summary>
4private void ShowImages()
5{
6 /**////ID为图片ID
7 int ImgID = Convert.ToInt32(Request.QueryString["ID"]);
8
9 /**////建立数据库连接
10 string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
11 SqlConnection Con = new SqlConnection(strCon);
12 String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID";
13 SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);
14 CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID;
15
16 Con.Open();
17 SqlDataReader SqlReader = CmdObj.ExecuteReader();
18 SqlReader.Read();
19
20 /**////设定输出文件类型
21 Response.ContentType = (string)SqlReader["ImageContentType"];
22
23 /**////输出图象文件二进制数制
24 Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]);
25 Response.End();
26
27 Con.Close();
28}
/**//// <summary>2
/// 显示图片3
/// </summary>4
private void ShowImages()5
{6
/**////ID为图片ID7
int ImgID = Convert.ToInt32(Request.QueryString["ID"]); 8
9
/**////建立数据库连接10
string strCon = System.Configuration.ConfigurationSettings.AppSettings["DSN"];11
SqlConnection Con = new SqlConnection(strCon);12
String SqlCmd = "SELECT * FROM ImageStore WHERE ImageID = @ImageID";13
SqlCommand CmdObj = new SqlCommand(SqlCmd, Con);14
CmdObj.Parameters.Add("@ImageID", SqlDbType.Int).Value = ImgID;15
16
Con.Open();17
SqlDataReader SqlReader = CmdObj.ExecuteReader();18
SqlReader.Read(); 19
20
/**////设定输出文件类型21
Response.ContentType = (string)SqlReader["ImageContentType"];22
23
/**////输出图象文件二进制数制24
Response.OutputStream.Write((byte[])SqlReader["ImageData"], 0, (int)SqlReader["ImageSize"]); 25
Response.End();26
27
Con.Close(); 28
}posted @ 2005-12-02 11:16 Chandler.C 阅读(553) 评论(3) 编辑
ASP.NET中常用功能代码总结（4）——保存图片到XML文件
ASP.NET中常用功能代码总结（4）——保存图片到XML文件
整理：Terrylee
一．保存图片到XML文件
1/**//// <summary>
2/// 保存图片到XML文件
3/// </summary>
4private void UploadImageToXml()
5{
6 /**////得到用户要上传的文件名
7 string strFilePathName = loFile.PostedFile.FileName;
8 string strFileName = Path.GetFileName(strFilePathName);
9 int FileLength = loFile.PostedFile.ContentLength;
10 if(FileLength<=0)
11 return;
12 try
13 {
14 /**////图象文件临时储存Byte数组
15 Byte[] FileByteArray = new Byte[FileLength];
16
17 /**////建立数据流对像
18 Stream StreamObject = loFile.PostedFile.InputStream;
19
20 /**////读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度
21 StreamObject.Read(FileByteArray,0,FileLength);
22
23 /**////要打开的文件
24 string fileName = Server.MapPath(".\\WriteXml.xml");
25
26 XmlDocument xmlDoc = new XmlDocument();
27 xmlDoc.Load(fileName);
28
29 /**////查找<dbGuest>
30 XmlNode root=xmlDoc.SelectSingleNode("dbImage");
31 XmlNodeList xnl=xmlDoc.SelectSingleNode("dbImage").ChildNodes;
32 int nIndex = xnl.Count;
33
34 /**////以下添加新结点
35 XmlElement xe1=xmlDoc.CreateElement("Image");//创建一个<User>节点
36
37 XmlElement xesub1=xmlDoc.CreateElement("ImageID");
38
39 /**////设置文本节点
40 xesub1.InnerText=nIndex.ToString();
41
42 /**////添加到<User>节点中
43 xe1.AppendChild(xesub1);
44 XmlElement xesub2=xmlDoc.CreateElement("ImageContentType");
45 xesub2.InnerText=loFile.PostedFile.ContentType;
46 xe1.AppendChild(xesub2);
47 XmlElement xesub3=xmlDoc.CreateElement("ImageSize");
48 xesub3.InnerText=FileLength.ToString();
49 xe1.AppendChild(xesub3);
50 XmlElement xesub4=xmlDoc.CreateElement("ImageDescription");
51 xesub4.InnerText=tbDescription.Text;
52 xe1.AppendChild(xesub4);
53 XmlElement xesub5=xmlDoc.CreateElement("ImageData");
54 xesub5.InnerText= Convert.ToBase64String(FileByteArray);
55 xe1.AppendChild(xesub5);
56
57 /**////添加到<dbGuest>节点中
58 root.AppendChild(xe1);
59 xmlDoc.Save(fileName);
60
61 Response.Redirect("ShowAllImg.aspx");
62 }
63 catch(Exception ex)
64 {
65 throw ex;
66 }
67}
/**//// <summary>2
/// 保存图片到XML文件3
/// </summary>4
private void UploadImageToXml()5
{6
/**////得到用户要上传的文件名7
string strFilePathName = loFile.PostedFile.FileName;8
string strFileName = Path.GetFileName(strFilePathName);9
int FileLength = loFile.PostedFile.ContentLength;10
if(FileLength<=0)11
return;12
try13
{ 14
/**////图象文件临时储存Byte数组15
Byte[] FileByteArray = new Byte[FileLength]; 16
17
/**////建立数据流对像18
Stream StreamObject = loFile.PostedFile.InputStream; 19
20
/**////读取图象文件数据，FileByteArray为数据储存体，0为数据指针位置、FileLnegth为数据长度21
StreamObject.Read(FileByteArray,0,FileLength); 22
23
/**////要打开的文件24
string fileName = Server.MapPath(".\\WriteXml.xml"); 25
26
XmlDocument xmlDoc = new XmlDocument();27
xmlDoc.Load(fileName);28
29
/**////查找<dbGuest>30
XmlNode root=xmlDoc.SelectSingleNode("dbImage");31
XmlNodeList xnl=xmlDoc.SelectSingleNode("dbImage").ChildNodes;32
int nIndex = xnl.Count;33
34
/**////以下添加新结点35
XmlElement xe1=xmlDoc.CreateElement("Image");//创建一个<User>节点36
37
XmlElement xesub1=xmlDoc.CreateElement("ImageID");38
39
/**////设置文本节点40
xesub1.InnerText=nIndex.ToString();41
42
/**////添加到<User>节点中43
xe1.AppendChild(xesub1);44
XmlElement xesub2=xmlDoc.CreateElement("ImageContentType");45
xesub2.InnerText=loFile.PostedFile.ContentType;46
xe1.AppendChild(xesub2);47
XmlElement xesub3=xmlDoc.CreateElement("ImageSize");48
xesub3.InnerText=FileLength.ToString();49
xe1.AppendChild(xesub3);50
XmlElement xesub4=xmlDoc.CreateElement("ImageDescription");51
xesub4.InnerText=tbDescription.Text;52
xe1.AppendChild(xesub4);53
XmlElement xesub5=xmlDoc.CreateElement("ImageData");54
xesub5.InnerText= Convert.ToBase64String(FileByteArray);55
xe1.AppendChild(xesub5);56
57
/**////添加到<dbGuest>节点中58
root.AppendChild(xe1);59
xmlDoc.Save(fileName);60
61
Response.Redirect("ShowAllImg.aspx");62
}63
catch(Exception ex)64
{65
throw ex;66
}67
}二．从XML中读取图片数据
1/**//// <summary>
2/// 从XML中读取图片
3/// </summary>
4/// <param name="ImageID">图片ID</param>
5private void ReadImageFromXml(string ImageID)
6{
7 /**////ID为图片ID
8 int ImgID = Convert.ToInt32(ImageID);
9
10 /**////要打开的文件
11 string fileName = Server.MapPath(".\\WriteXml.xml");
12
13 XmlDocument xmlDoc = new XmlDocument();
14 xmlDoc.Load(fileName);
15 XmlNodeList node = xmlDoc.SelectSingleNode("//Image[ImageID='"+ImgID.ToString()+"']").ChildNodes;
16 if(node!=null)
17 {
18 string strType = node.Item(1).InnerText;
19 string strData =node.Item(4).InnerText;
20 int nSize = int.Parse(node.Item(2).InnerText);
21
22 /**////设定输出文件类型
23 Response.ContentType = strType;
24
25 /**////输出图象文件二进制数制
26 Response.OutputStream.Write(Convert.FromBase64String(strData), 0, nSize);
27 Response.End();
28
29 //也可以保存为图像
30 //FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);
31 //fs.Write((Convert.FromBase64String(strData), 0,nSize);
32 //fs.Close();
33 }
34}
/**//// <summary>2
/// 从XML中读取图片3
/// </summary>4
/// <param name="ImageID">图片ID</param>5
private void ReadImageFromXml(string ImageID)6
{ 7
/**////ID为图片ID8
int ImgID = Convert.ToInt32(ImageID); 9
10
/**////要打开的文件11
string fileName = Server.MapPath(".\\WriteXml.xml"); 12
13
XmlDocument xmlDoc = new XmlDocument();14
xmlDoc.Load(fileName);15
XmlNodeList node = xmlDoc.SelectSingleNode("//Image[ImageID='"+ImgID.ToString()+"']").ChildNodes;16
if(node!=null)17
{18
string strType = node.Item(1).InnerText;19
string strData =node.Item(4).InnerText;20
int nSize = int.Parse(node.Item(2).InnerText);21
22
/**////设定输出文件类型23
Response.ContentType = strType;24
25
/**////输出图象文件二进制数制26
Response.OutputStream.Write(Convert.FromBase64String(strData), 0, nSize); 27
Response.End();28
29
//也可以保存为图像30
//FileStream fs = new FileStream(@"C:\aa.BMP", FileMode.OpenOrCreate, FileAccess.Write);31
//fs.Write((Convert.FromBase64String(strData), 0,nSize);32
//fs.Close();33
}34
}posted @ 2005-12-02 11:16 Chandler.C 阅读(305) 评论(2) 编辑
ASP.NET中常用功能代码总结（6）——XML文件操作篇
posted @ 2005-12-02 11:07 Chandler.C 阅读(315) 评论(2) 编辑