实例介绍
【实例简介】字符串截取/图片地址提取/ip地址检测。。。。
【实例截图】
【实例截图】
【核心代码】
/*************************************************************************************
* 代码:吴蒋
* 时间:2012.03.30
* 说明:字符串处理公共基类
* 其他:
* 修改人：
* 修改时间：
* 修改说明：
************************************************************************************/
using System;
using System.Web;
using System.Text.RegularExpressions;
using System.Text;
namespace Common
{
public class StringHelp
{
/// <summary>
/// 默认构造函数
/// </summary>
public StringHelp() { }
/// <summary>
/// 判断参数字符是否为空
/// </summary>
/// <param name="sourceString">输入字符串</param>
/// <returns>True:为空;falsh:不为空</returns>
public static bool IsNull(string sourceString)
{
if (String.Equals(sourceString, null) || String.Equals(sourceString, ""))
{
return true;
}
return false;
}
/// <summary>
/// 获取操作字符串长度
/// </summary>
/// <param name="sourceString">输入字符串</param>
/// <returns>返回长度</returns>
public static int MaxLength(string sourceString)
{
return sourceString.Length;
}
/// <summary>
/// 双向截取一定长度字符串
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <param name="leftOrRight">截取方向True:Left;Flash:Right</param>
/// <param name="size">要截取的大小</param>
/// <returns>返回截取后的字符串</returns>
public static string InterceptString(string sourceString, bool leftOrRight, int size)
{
if (IsNull(sourceString))
{ throw new Exception("操作字符串参数不能为空！"); }
int maxLength = MaxLength(sourceString);
if (size >= maxLength)
{
return sourceString;
}
if (leftOrRight)
{
return sourceString.Substring(0, size);
}
return sourceString.Substring(maxLength - size, size);
}
/// <summary>
/// 浅去除Html
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回操作后字符串</returns>
public static string WipeOffHtml(string sourceString)
{
return Regex.Replace(sourceString, "<[^>]*>", "");
}
/// <summary>
/// 深去除Html包括脚本等
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回操作后字符串</returns>
public string ScriptHtml(string sourceString)
{
string[] aryReg = {
@"<script[^>]*?>.*?</script>",
@"<(\/\s*)?!?((\w :)?\w )(\w (\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w )|.{0})|\s)*?(\/\s*)?>",
@"([\r\n])[\s] ",
@"&(quot|#34);",
@"&(amp|#38);",
@"&(lt|#60);",
@"&(gt|#62);",
@"&(nbsp|#160);",
@"&(iexcl|#161);",
@"&(cent|#162);",
@"&(pound|#163);",
@"&(copy|#169);",
@"&#(\d );",
@"-->",
@"<!--.*\n"
};
string[] aryRep = {
"",
"",
"",
"\"",
"&",
"<",
">",
" ",
"\xa1",//chr(161),
"\xa2",//chr(162),
"\xa3",//chr(163),
"\xa9",//chr(169),
"",
"\r\n",
""
};
string newReg = aryReg[0];
string strOutput = sourceString;
for (int i = 0; i < aryReg.Length; i )
{
Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase);
strOutput = regex.Replace(strOutput, aryRep[i]);
}
strOutput.Replace("<", "");
strOutput.Replace(">", "");
strOutput.Replace("\r\n", "");
return strOutput;
}
/// <summary>
/// 输入HTML中的ImgUrl
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回干净的Url</returns>
public static string GetImgUrl(string sourceString)
{
string str = string.Empty;
Regex r = new Regex(@"<img\s [^>]*\s*src\s*=\s*([']?)(?<url>\S )'?[^>]*>",
RegexOptions.Compiled);
Match m = r.Match(sourceString.ToLower());
if (m.Success)
str = m.Result("${url}");
return str;
}
/// <summary>
/// 过滤SQL注入
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回安全的SQL</returns>
public static string FilterSql(string sourceString)
{
string str = sourceString;
str = str.Replace("'", "''");
str = str.Replace("<", "<");
str = str.Replace(">", ">");
return str;
}
/// <summary>
/// 移除非法或不友好字符
/// </summary>
/// <param name="keyWord">非法或不友好字符以|隔开</param>
/// <param name="chkStr">要处理的字符串</param>
/// <returns>处理后的字符串</returns>
public static string FilterBadWords(string keyWord, string sourceString)
{
if (sourceString == "")
{
return "";
}
string[] bwords = keyWord.Split('|');
int i, j;
string str;
StringBuilder sb = new StringBuilder();
for (i = 0; i < bwords.Length; i )
{
str = bwords[i].ToString().Trim();
string regStr, toStr;
regStr = str;
Regex r = new Regex(regStr, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Multiline);
Match m = r.Match(sourceString);
if (m.Success)
{
j = m.Value.Length;
sb.Insert(0, "*", j);
toStr = sb.ToString();
sourceString = Regex.Replace(sourceString, regStr, toStr, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.Multiline);
}
sb.Remove(0, sb.Length);
}
return sourceString;
}
/// <summary>
/// 判断是否是合法IPV4
/// </summary>
/// <param name="sourceString">要处理的字符串</param>
/// <returns>返回结果</returns>
public static bool IsIPV4(string sourceString)
{
Regex rx = new Regex(@"((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))");
return (rx.IsMatch(sourceString));
}
/// <summary>
/// IPV4转数字
/// </summary>
/// <param name="sourceString">要处理的字符串</param>
/// <returns>返回结果</returns>
public static double IPV4Convert(string sourceString)
{
if (!IsIPV4(sourceString))
{
throw new Exception("IP不合法!");
}
string[] listIP = sourceString.Split('.');
StringBuilder intIP = new StringBuilder();
for (int i = 0; i < listIP.Length; i )
{
string ipPart = listIP[i].ToString();
if (ipPart.Length == 3)
{
intIP.Append(ipPart);
}
if (ipPart.Length == 2)
{
intIP.Append("0" ipPart);
}
if (ipPart.Length == 1)
{
intIP.Append("00" ipPart);
}
}
return Convert.ToDouble(intIP.ToString());
}
/// <summary>
/// 正则表达式判断字符串格式
/// </summary>
/// <param name="sourceString">要处理的字符串</param>
/// <param name="strVerdict">正则表达式</param>
/// <returns>返回结果</returns>
public static bool FormatVerdict(string sourceString, string strVerdict)
{
Regex rx = new Regex(strVerdict);
return (rx.IsMatch(sourceString));
}
/// <summary>
/// 从字符串中的尾部删除指定的字符串
/// </summary>
/// <param name="sourceString">需要处理的字符串</param>
/// <param name="removedString">删除匹配字符串</param>
/// <returns>处理后字符串</returns>
public static string Remove(string sourceString, string removedString)
{
try
{
if (sourceString.IndexOf(removedString) < 0)
throw new Exception("原字符串中不包含移除字符串！");
string result = sourceString;
int lengthOfSourceString = sourceString.Length;
int lengthOfRemovedString = removedString.Length;
int startIndex = lengthOfSourceString - lengthOfRemovedString;
string tempSubString = sourceString.Substring(startIndex);
if (tempSubString.ToUpper() == removedString.ToUpper())
{
result = sourceString.Remove(startIndex, lengthOfRemovedString);
}
return result;
}
catch
{
return sourceString;
}
}
/// <summary>
/// 获取拆分符右边的字符串
/// </summary>
/// <param name="sourceString"></param>
/// <param name="splitChar"></param>
/// <returns></returns>
public static string RightSplit(string sourceString, char splitChar)
{
string result = null;
string[] tempString = sourceString.Split(splitChar);
if (tempString.Length > 0)
{
result = tempString[tempString.Length - 1].ToString();
}
return result;
}
/// <summary>
/// 获取拆分符左边的字符串
/// </summary>
/// <param name="sourceString"></param>
/// <param name="splitChar"></param>
/// <returns></returns>
public static string LeftSplit(string sourceString, char splitChar)
{
string result = null;
string[] tempString = sourceString.Split(splitChar);
if (tempString.Length > 0)
{
result = tempString[0].ToString();
}
return result;
}
/// <summary>
/// 去掉最后一个逗号
/// </summary>
/// <param name="origin"></param>
/// <returns></returns>
public static string DelLastComma(string origin)
{
if (origin.IndexOf(",") == -1)
{
return origin;
}
return origin.Substring(0, origin.LastIndexOf(","));
}
/// <summary>
/// 删除不可见字符
/// </summary>
/// <param name="sourceString"></param>
/// <returns></returns>
public static string DeleteUnVisibleChar(string sourceString)
{
System.Text.StringBuilder sBuilder = new System.Text.StringBuilder(131);
for (int i = 0; i < sourceString.Length; i )
{
int Unicode = sourceString[i];
if (Unicode >= 16)
{
sBuilder.Append(sourceString[i].ToString());
}
}
return sBuilder.ToString();
}
/// <summary>
/// 获取数组元素的合并字符串
/// </summary>
/// <param name="stringArray"></param>
/// <returns></returns>
public static string GetArrayString(string[] stringArray)
{
string totalString = null;
for (int i = 0; i < stringArray.Length; i )
{
totalString = totalString stringArray[i];
}
return totalString;
}
/// <summary>
/// 获取某一字符串在字符串数组中出现的次数
/// </summary>
/// <param name="stringArray">输入要查询的字符串</param>
/// <param name="findString">输入操作字符串</param>
/// <returns>返回出现次数</returns>
public static int GetStringCount(string[] stringArray, string findString)
{
int count = -1;
string totalString = GetArrayString(stringArray);
string subString = totalString;
while (subString.IndexOf(findString) >= 0)
{
subString = totalString.Substring(subString.IndexOf(findString));
count = 1;
}
return count;
}
/// <summary>
/// 获取某一字符串在字符串中出现的次数
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <param name="findString">要查询的字符</param>
/// <returns>返回出现次数</returns>
public static int GetStringCount(string sourceString, string findString)
{
int count = 0;
int findStringLength = findString.Length;
string subString = sourceString;
while (subString.IndexOf(findString) >= 0)
{
subString = subString.Substring(subString.IndexOf(findString) findStringLength);
count = 1;
}
return count;
}
/// <summary>
/// 截取从startString开始到原字符串结尾的所有字符
/// </summary>
/// <param name="sourceString">需要操作的字符串</param>
/// <param name="startString">开始字符</param>
/// <returns>返回结果</returns>
public static string GetSubString(string sourceString, string startString)
{
try
{
int index = sourceString.ToUpper().IndexOf(startString);
if (index > 0)
{
return sourceString.Substring(index);
}
return sourceString;
}
catch
{
return "";
}
}
/// <summary>
/// 删除从beginRemovedString到 endRemovedString的字符串
/// </summary>
/// <param name="sourceString">需要操作的字符串</param>
/// <param name="beginRemovedString">开始字符</param>
/// <param name="endRemovedString">结束字符</param>
/// <returns>返回结果</returns>
public static string GetSubString(string sourceString, string beginRemovedString, string endRemovedString)
{
try
{
if (sourceString.IndexOf(beginRemovedString) != 0)
beginRemovedString = "";
if (sourceString.LastIndexOf(endRemovedString, sourceString.Length - endRemovedString.Length) < 0)
endRemovedString = "";
int startIndex = beginRemovedString.Length;
int length = sourceString.Length - beginRemovedString.Length - endRemovedString.Length;
if (length > 0)
{
return sourceString.Substring(startIndex, length);
}
return sourceString;
}
catch
{
return sourceString; ;
}
}
/// <summary>
/// 按字节数取出字符串的长度
/// </summary>
/// <param name="strTmp">要计算的字符串</param>
/// <returns>字符串的字节数</returns>
public static int GetByteCount(string strTmp)
{
int intCharCount = 0;
for (int i = 0; i < strTmp.Length; i )
{
if (System.Text.UTF8Encoding.UTF8.GetByteCount(strTmp.Substring(i, 1)) == 3)
{
intCharCount = intCharCount 2;
}
else
{
intCharCount = intCharCount 1;
}
}
return intCharCount;
}
/// <summary>
/// 按字节数要在字符串的位置
/// </summary>
/// <param name="intIns">字符串的位置</param>
/// <param name="strTmp">要计算的字符串</param>
/// <returns>字节的位置</returns>
public static int GetByteIndex(int intIns, string strTmp)
{
int intReIns = 0;
if (strTmp.Trim() == "")
{
return intIns;
}
for (int i = 0; i < strTmp.Length; i )
{
if (System.Text.UTF8Encoding.UTF8.GetByteCount(strTmp.Substring(i, 1)) == 3)
{
intReIns = intReIns 2;
}
else
{
intReIns = intReIns 1;
}
if (intReIns >= intIns)
{
intReIns = i 1;
break;
}
}
return intReIns;
}
/// <summary>
/// 截取输入最大的字符串
/// </summary>
/// <param name="text">输入字符串</param>
/// <param name="maxLength">最大长度</param>
/// <returns>返回操作结果</returns>
public static string InputText(string sourceString, int maxLength)
{
sourceString = sourceString.Trim();
if (string.IsNullOrEmpty(sourceString))
return string.Empty;
if (sourceString.Length > maxLength)
sourceString = sourceString.Substring(0, maxLength);
sourceString = Regex.Replace(sourceString, "[\\s]{2,}", " "); //two or more spaces
sourceString = Regex.Replace(sourceString, "(<[b|B][r|R]/*>) |(<[p|P](.|\\n)*?>)", "\n"); //<br>
sourceString = Regex.Replace(sourceString, "(\\s*&[n|N][b|B][s|S][p|P];\\s*) ", " "); //
sourceString = Regex.Replace(sourceString, "<(.|\\n)*?>", string.Empty); //any other tags
sourceString = sourceString.Replace("'", "''");
return sourceString;
}
/// <summary>
/// 转义操作
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回操作结果</returns>
public static string Encode(string sourceString)
{
sourceString = sourceString.Replace("'", "＇");
sourceString = sourceString.Replace("\"", """);
sourceString = sourceString.Replace("<", "<");
sourceString = sourceString.Replace(">", ">");
return sourceString;
}
/// <summary>
/// 反义操作
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回操作结果</returns>
public static string Decode(string sourceString)
{
sourceString = sourceString.Replace(">", ">");
sourceString = sourceString.Replace("<", "<");
sourceString = sourceString.Replace(" ", " ");
sourceString = sourceString.Replace(""", "\"");
return sourceString;
}
/// <summary>
/// 字符传的转换 用在查询 登陆时 防止恶意的盗取密码
/// </summary>
/// <param name="sourceString">输入操作字符串</param>
/// <returns>返回操作结果</returns>
public static string TBCode(string sourceString)
{
sourceString = sourceString.Replace("!", "");
sourceString = sourceString.Replace("@", "");
sourceString = sourceString.Replace("#", "");
sourceString = sourceString.Replace("$", "");
sourceString = sourceString.Replace("%", "");
sourceString = sourceString.Replace("^", "");
sourceString = sourceString.Replace("&", "");
sourceString = sourceString.Replace("*", "");
sourceString = sourceString.Replace("(", "");
sourceString = sourceString.Replace(")", "");
sourceString = sourceString.Replace("_", "");
sourceString = sourceString.Replace(" ", "");
sourceString = sourceString.Replace("|", "");
sourceString = sourceString.Replace("?", "");
sourceString = sourceString.Replace("/", "");
sourceString = sourceString.Replace(".", "");
sourceString = sourceString.Replace(">", "");
sourceString = sourceString.Replace("<", "");
sourceString = sourceString.Replace("{", "");
sourceString = sourceString.Replace("}", "");
sourceString = sourceString.Replace("[", "");
sourceString = sourceString.Replace("]", "");
sourceString = sourceString.Replace("-", "");
sourceString = sourceString.Replace("=", "");
sourceString = sourceString.Replace(",", "");
return sourceString;
}
}
}
标签： C#
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