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】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 | /************************************************************************************** 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; } }} |
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