Java实现的文本字符串操作工具类实例【数据替换，加密解密操作】

 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  '>') { 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 > 2) & 0x3f; ret.append(cvt.charAt(c)); c = (data[i] << 4) & 0x3f; if (++i > 4) & 0x0f; ret.append(cvt.charAt(c)); if (i > 6) & 0x03; ret.append(cvt.charAt(c)); } else { ++i; ret.append((char) fillchar); } if (i > 4) & 0x3)); ret.append((char) c); if (++i > 2) & 0xf); ret.append((char) c1); } if (++i  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 length, the String will be * chopped there. If no newline or whitespace is found in * string up to the index length, the String * will chopped at length. * 
 * 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 to length, 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  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  '>') { 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 >> 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 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")); } }