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这篇文章将为大家详细讲解有关Java怎么实现的文本字符串操作工具类实例,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
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本文实例讲述了Java实现的文本字符串操作工具类。分享给大家供大家参考,具体如下:
package com.gcloud.common; import org.apache.commons.lang.StringUtils; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.text.BreakIterator; import java.util.ArrayList; import java.util.Date; import java.util.Random; /** * 文本字符串工具类 * Created by charlin on 2017/9/10. */ public class TextUtil { private static final char[] QUOTE_ENCODE = """.toCharArray(); private static final char[] AMP_ENCODE = "&".toCharArray(); private static final char[] LT_ENCODE = "<".toCharArray(); private static final char[] GT_ENCODE = ">".toCharArray(); private final static String[] hex = { "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", "1C", "1D", "1E", "1F", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", "4D", "4E", "4F", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", "5E", "5F", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B", "6C", "6D", "6E", "6F", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", "7F", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B", "8C", "8D", "8E", "8F", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F", "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB", "AC", "AD", "AE", "AF", "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF", "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", "CC", "CD", "CE", "CF", "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF", "E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", "ED", "EE", "EF", "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF" }; private final static byte[] val = { 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F }; private static MessageDigest digest = null; /** * 替换字符串 * @param line * @param oldStr * @param newStr * @return */ public static String replace(String line , String oldStr, String newStr){ if (StringUtils.isEmpty(line)) return null; int index = 0; if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); return buf.toString(); } return line; } /** * 替换字符串,并存入替换次数 * @param line * @param oldStr * @param newStr * @return */ public static String replace(String line , String oldStr, String newStr, int[] countArr){ if (StringUtils.isEmpty(line)) return null; int index = 0; if ((index = line.indexOf(oldStr, index)) >= 0){ int count = 0; count++; char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; count++; } buf.append(charArray, i, charArray.length - i); countArr[0] = count; return buf.toString(); } return line; } /** * 替换字符串,不区分大小写 * @param line * @param oldStr * @param newStr * @return */ public static String replaceIgnoreCase(String line , String oldStr, String newStr){ if (StringUtils.isEmpty(line)) return null; int index = 0; line = line.toLowerCase(); oldStr = oldStr.toLowerCase(); if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); return buf.toString(); } return line; } /** * 替换字符串,不区分大小写, 并存入替换次数 * @param line * @param oldStr * @param newStr * @return */ public static String replaceIgnoreCase(String line , String oldStr, String newStr, int[] countArr){ if (StringUtils.isEmpty(line)) return null; int index = 0; line = line.toLowerCase(); oldStr = oldStr.toLowerCase(); if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; int count = 0; while((index = line.indexOf(oldStr, index)) > 0){ count ++; buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); countArr[0] = count; return buf.toString(); } return line; } /** * 替换页面html标签 * @param htmlStr * @return */ public static String escapeHTMLTags(String htmlStr) { if (StringUtils.isEmpty(htmlStr)) return null; char ch; int last = 0; char[] htmlStrArr = htmlStr.toCharArray(); int len = htmlStrArr.length; StringBuffer outBuf = new StringBuffer((int) (len * 1.3)); int i = 0; for (; i < len; i++) { ch = htmlStrArr[i]; if (ch > '>') { continue; } else if (ch == '<') { if (i > last) { outBuf.append(htmlStrArr, last, i - last); } last = i + 1; outBuf.append(LT_ENCODE); } else if (ch == '>') { if (i > last) { outBuf.append(htmlStrArr, last, i - last); } last = i + 1; outBuf.append(GT_ENCODE); } } if (last == 0) { return htmlStr; } if (i > last) { outBuf.append(htmlStrArr, last, i - last); } return outBuf.toString(); } /** * Hashes a String using the Md5 algorithm and returns the result as a * String of hexadecimal numbers. This method is synchronized to avoid * excessive MessageDigest object creation. If calling this method becomes a * bottleneck in your code, you may wish to maintain a pool of MessageDigest * objects instead of using this method. * @param data * @return */ public synchronized static String hash(String data) { if (digest == null) { try { digest = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { System.err.println("Failed to load the MD5 MessageDigest.Jive will be unable to function normally."); e.printStackTrace(); } } digest.update(data.getBytes()); return encodeHex(digest.digest()); } /** * Turns an array of bytes into a String representing each byte as an * unsigned hex number. * @param bytes * @return */ public static final String encodeHex(byte[] bytes) { StringBuffer buf = new StringBuffer(bytes.length * 2); int i; for (i = 0; i < bytes.length; i++) { if (((int) bytes[i] & 0xff) < 0x10) { buf.append("0"); } buf.append(Long.toString((int) bytes[i] & 0xff, 16)); } return buf.toString(); } /** * Turns a hex encoded string into a byte array. It is specifically meant to * "reverse" the toHex(byte[]) method. * @param hex * @return */ public static byte[] decodeHex(String hex) { char[] chars = hex.toCharArray(); byte[] bytes = new byte[chars.length / 2]; int byteCount = 0; for (int i = 0; i < chars.length; i += 2) { byte newByte = 0x00; newByte |= hexCharToByte(chars[i]); newByte <<= 4; newByte |= hexCharToByte(chars[i + 1]); bytes[byteCount] = newByte; byteCount++; } return bytes; } /** * Returns the the byte value of a hexadecmical char (0-f). It's assumed * that the hexidecimal chars are lower case as appropriate. * @param ch a hexedicmal character (0-f) * @return the byte value of the character (0x00-0x0F) */ private static final byte hexCharToByte(char ch) { switch (ch) { case '0': return 0x00; case '1': return 0x01; case '2': return 0x02; case '3': return 0x03; case '4': return 0x04; case '5': return 0x05; case '6': return 0x06; case '7': return 0x07; case '8': return 0x08; case '9': return 0x09; case 'a': return 0x0A; case 'b': return 0x0B; case 'c': return 0x0C; case 'd': return 0x0D; case 'e': return 0x0E; case 'f': return 0x0F; } return 0x00; } // ********************************************************************* // * Base64 - a simple base64 encoder and decoder. // ********************************************************************* /** * Encodes a String as a base64 String. * @param data a String to encode. * @return a base64 encoded String. */ public static String encodeBase64(String data) { return encodeBase64(data.getBytes()); } /** * Encodes a byte array into a base64 String. * @param data a byte array to encode. * @return a base64 encode String. */ public static String encodeBase64(byte[] data) { int c; int len = data.length; StringBuffer ret = new StringBuffer(((len / 3) + 1) * 4); for (int i = 0; i < len; ++i) { c = (data[i] >> 2) & 0x3f; ret.append(cvt.charAt(c)); c = (data[i] << 4) & 0x3f; if (++i < len) c |= (data[i] >> 4) & 0x0f; ret.append(cvt.charAt(c)); if (i < len) { c = (data[i] << 2) & 0x3f; if (++i < len) c |= (data[i] >> 6) & 0x03; ret.append(cvt.charAt(c)); } else { ++i; ret.append((char) fillchar); } if (i < len) { c = data[i] & 0x3f; ret.append(cvt.charAt(c)); } else { ret.append((char) fillchar); } } return ret.toString(); } /** * Decodes a base64 String. * @param data a base64 encoded String to decode. * @return the decoded String. */ public static String decodeBase64(String data) { return decodeBase64(data.getBytes()); } /** * Decodes a base64 aray of bytes. * @param data a base64 encode byte array to decode. * @return the decoded String. */ public static String decodeBase64(byte[] data) { int c, c1; int len = data.length; StringBuffer ret = new StringBuffer((len * 3) / 4); for (int i = 0; i < len; ++i) { c = cvt.indexOf(data[i]); ++i; c1 = cvt.indexOf(data[i]); c = ((c << 2) | ((c1 >> 4) & 0x3)); ret.append((char) c); if (++i < len) { c = data[i]; if (fillchar == c) break; c = cvt.indexOf((char) c); c1 = ((c1 << 4) & 0xf0) | ((c >> 2) & 0xf); ret.append((char) c1); } if (++i < len) { c1 = data[i]; if (fillchar == c1) break; c1 = cvt.indexOf((char) c1); c = ((c << 6) & 0xc0) | c1; ret.append((char) c); } } return ret.toString(); } private static final int fillchar = '='; private static final String cvt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "0123456789+/"; /** * Converts a line of text into an array of lower case words using a * BreakIterator.wordInstance(). * This method is under the Jive Open Source Software License and was * written by Mark Imbriaco. * @param text a String of text to convert into an array of words * @return text broken up into an array of words. */ public static final String[] toLowerCaseWordArray(String text) { if (text == null || text.length() == 0) { return new String[0]; } ArrayList wordList = new ArrayList(); BreakIterator boundary = BreakIterator.getWordInstance(); boundary.setText(text); int start = 0; for (int end = boundary.next(); end != BreakIterator.DONE; start = end, end = boundary.next()) { String tmp = text.substring(start, end).trim(); tmp = replace(tmp, "+", ""); tmp = replace(tmp, "/", ""); tmp = replace(tmp, "\\", ""); tmp = replace(tmp, "#", ""); tmp = replace(tmp, "*", ""); tmp = replace(tmp, ")", ""); tmp = replace(tmp, "(", ""); tmp = replace(tmp, "&", ""); if (tmp.length() > 0) { wordList.add(tmp); } } return (String[]) wordList.toArray(new String[wordList.size()]); } /** * Pseudo-random number generator object for use with randomString(). The * Random class is not considered to be cryptographically secure, so only * use these random Strings for low to medium security applications. */ private static Random randGen = new Random(); /** * Array of numbers and letters of mixed case. Numbers appear in the list * twice so that there is a more equal chance that a number will be picked. * We can use the array to get a random number or letter by picking a random * array index. */ private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" + "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray(); /** * Returns a random String of numbers and letters (lower and upper case) of * the specified length. The method uses the Random class that is built-in * to Java which is suitable for low to medium grade security uses. This * means that the output is only pseudo random, i.e., each number is * mathematically generated so is not truly random. * @param length the desired length of the random String to return. * @return a random String of numbers and letters of the specified length. */ public static final String randomString(int length) { if (length < 1) { return null; } char[] randBuffer = new char[length]; for (int i = 0; i < randBuffer.length; i++) { randBuffer[i] = numbersAndLetters[randGen.nextInt(71)]; } return new String(randBuffer); } /** * Intelligently chops a String at a word boundary (whitespace) that occurs * at the specified index in the argument or before. However, if there is a * newline character beforelength
, the String will be * chopped there. If no newline or whitespace is found in *string
up to the indexlength
, the String * will chopped atlength
. ** For example, chopAtWord("This is a nice String", 10) will return "This is * a" which is the first word boundary less than or equal to 10 characters * into the original String. * @param string the String to chop. * @param length * @return a substring of
string
whose length is less than or * equal tolength
, and that is chopped at * whitespace. */ public static final String chopAtWord(String string, int length) { if (string == null) { return string; } char[] charArray = string.toCharArray(); int sLength = string.length(); if (length < sLength) { sLength = length; } // First check if there is a newline character before length; if so, // chop word there. for (int i = 0; i < sLength - 1; i++) { // Windows if (charArray[i] == '\r' && charArray[i + 1] == '\n') { return string.substring(0, i + 1); } // Unix else if (charArray[i] == '\n') { return string.substring(0, i); } } // Also check boundary case of Unix newline if (charArray[sLength - 1] == '\n') { return string.substring(0, sLength - 1); } // Done checking for newline, now see if the total string is less than // the specified chop point. if (string.length() < length) { return string; } // No newline, so chop at the first whitespace. for (int i = length - 1; i > 0; i--) { if (charArray[i] == ' ') { return string.substring(0, i).trim(); } } // Did not find word boundary so return original String chopped at // specified length. return string.substring(0, length); } /** * Escapes all necessary characters in the String so that it can be used in * an XML doc. * @param string the string to escape. * @return the string with appropriate characters escaped. */ public static final String escapeForXML(String string) { if (string == null) { return null; } char ch; int i = 0; int last = 0; char[] input = string.toCharArray(); int len = input.length; StringBuffer out = new StringBuffer((int) (len * 1.3)); for (; i < len; i++) { ch = input[i]; if (ch > '>') { continue; } else if (ch == '<') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(LT_ENCODE); } else if (ch == '&') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(AMP_ENCODE); } else if (ch == '"') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(QUOTE_ENCODE); } } if (last == 0) { return string; } if (i > last) { out.append(input, last, i - last); } return out.toString(); } /** * Unescapes the String by converting XML escape sequences back into normal * characters. * @param string the string to unescape. * @return the string with appropriate characters unescaped. */ public static final String unescapeFromXML(String string) { string = replace(string, "<", "<"); string = replace(string, ">", ">"); string = replace(string, """, "\""); return replace(string, "&", "&"); } public static String escape(String s) { StringBuffer sbuf = new StringBuffer(); int len = s.length(); for (int i = 0; i < len; i++) { int ch = s.charAt(i); if (ch == ' ') { // space : map to '+' sbuf.append('+'); } else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was sbuf.append((char) ch); } else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was sbuf.append((char) ch); } else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was sbuf.append((char) ch); } else if (ch == '-' || ch == '_' // unreserved : as it was || ch == '.' || ch == '!' || ch == '~' || ch == '*' || ch == '\'' || ch == '(' || ch == ')') { sbuf.append((char) ch); } else if (ch <= 0x007F) { // other ASCII : map to %XX sbuf.append('%'); sbuf.append(hex[ch]); } else { // unicode : map to %uXXXX sbuf.append('%'); sbuf.append('u'); sbuf.append(hex[(ch >>> 8)]); sbuf.append(hex[(0x00FF & ch)]); } } return sbuf.toString(); } public static String unescape(String s) { StringBuffer sbuf = new StringBuffer(); int i = 0; int len = s.length(); while (i < len) { int ch = s.charAt(i); if (ch == '+') { // + : map to ' ' sbuf.append(' '); } else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was sbuf.append((char) ch); } else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was sbuf.append((char) ch); } else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was sbuf.append((char) ch); } else if (ch == '-' || ch == '_' // unreserved : as it was || ch == '.' || ch == '!' || ch == '~' || ch == '*' || ch == '\'' || ch == '(' || ch == ')') { sbuf.append((char) ch); } else if (ch == '%') { int cint = 0; if ('u' != s.charAt(i + 1)) { // %XX : map to ascii(XX) cint = (cint << 4) | val[s.charAt(i + 1)]; cint = (cint << 4) | val[s.charAt(i + 2)]; i += 2; } else { // %uXXXX : map to unicode(XXXX) cint = (cint << 4) | val[s.charAt(i + 2)]; cint = (cint << 4) | val[s.charAt(i + 3)]; cint = (cint << 4) | val[s.charAt(i + 4)]; cint = (cint << 4) | val[s.charAt(i + 5)]; i += 5; } sbuf.append((char) cint); } i++; } return sbuf.toString(); } private static final char[] zeroArray = "0000000000000000".toCharArray(); /** * Pads the supplied String with 0's to the specified length and returns the * result as a new String. For example, if the initial String is "9999" and * the desired length is 8, the result would be "00009999". This type of * padding is useful for creating numerical values that need to be stored * and sorted as character data. Note: the current implementation of this * method allows for a maximum length of 16. * * @param string * the original String to pad. * @param length * the desired length of the new padded String. * @return a new String padded with the required number of 0's. */ public static final String zeroPadString(String string, int length) { if (string == null || string.length() > length) { return string; } StringBuffer buf = new StringBuffer(length); buf.append(zeroArray, 0, length - string.length()).append(string); return buf.toString(); } /** * Formats a Date as a fifteen character long String made up of the Date's * padded millisecond value. * @return a Date encoded as a String. */ public static final String dateToMillis(Date date) { return zeroPadString(Long.toString(date.getTime()), 15); } public static void main(String[] args) { System.out.println(replace("aaaaabbbcccc", "aa", "gg")); System.out.println(replaceIgnoreCase("AAAAbbbcccc", "aa", "gg")); System.out.println(escapeHTMLTags("AAAAbb")); } }
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