基于Java的实例源码-常用工具包 Jodd.zip

// Copyright (c) 2003-2012, Jodd Team (jodd.org). All Rights Reserved. package jodd.util; import jodd.typeconverter.Convert; import static jodd.util.StringPool.EMPTY; import java.io.UnsupportedEncodingException; /** * Various String utilities. * @see jodd.util.TextUtil */ public class StringUtil { // ---------------------------------------------------------------- replace /** * Replaces all occurrences of a certain pattern in a string with a * replacement string. This is the fastest replace function known to author. * * @param s string to be inspected * @param sub string pattern to be replaced * @param with string that should go where the pattern was */ public static String replace(String s, String sub, String with) { int c = 0; int i = s.indexOf(sub, c); if (i == -1) { return s; } int length = s.length(); StringBuilder sb = new StringBuilder(length + with.length()); do { sb.append(s.substring(c, i)); sb.append(with); c = i + sub.length(); } while ((i = s.indexOf(sub, c)) != -1); if (c < length) { sb.append(s.substring(c, length)); } return sb.toString(); } /** * Replaces all occurrences of a character in a string. * * @param s input string * @param sub character to replace * @param with character to replace with */ public static String replaceChar(String s, char sub, char with) { int startIndex = s.indexOf(sub); if (startIndex == -1) { return s; } char[] str = s.toCharArray(); for (int i = startIndex; i < str.length; i++) { if (str[i] == sub) { str[i] = with; } } return new String(str); } /** * Replaces all occurrences of a characters in a string. * * @param s input string * @param sub characters to replace * @param with characters to replace with */ public static String replaceChars(String s, char[] sub, char[] with) { char[] str = s.toCharArray(); for (int i = 0; i < str.length; i++) { char c = str[i]; for (int j = 0; j < sub.length; j++) { if (c == sub[j]) { str[i] = with[j]; break; } } } return new String(str); } /** * Replaces the very first occurrence of a substring with supplied string. * * @param s source string * @param sub substring to replace * @param with substring to replace with */ public static String replaceFirst(String s, String sub, String with) { int i = s.indexOf(sub); if (i == -1) { return s; } return s.substring(0, i) + with + s.substring(i + sub.length()); } /** * Replaces the very first occurrence of a character in a string. * * @param s string * @param sub char to replace * @param with char to replace with */ public static String replaceFirst(String s, char sub, char with) { int index = s.indexOf(sub); if (index == -1) { return s; } char[] str = s.toCharArray(); str[index] = with; return new String(str); } /** * Replaces the very last occurrence of a substring with supplied string. * * @param s source string * @param sub substring to replace * @param with substring to replace with */ public static String replaceLast(String s, String sub, String with) { int i = s.lastIndexOf(sub); if (i == -1) { return s; } return s.substring(0, i) + with + s.substring(i + sub.length()); } /** * Replaces the very last occurrence of a character in a string. * * @param s string * @param sub char to replace * @param with char to replace with */ public static String replaceLast(String s, char sub, char with) { int index = s.lastIndexOf(sub); if (index == -1) { return s; } char[] str = s.toCharArray(); str[index] = with; return new String(str); } // ---------------------------------------------------------------- remove /** * Removes all substring occurrences from the string. * * @param s source string * @param sub substring to remove */ public static String remove(String s, String sub) { int c = 0; int sublen = sub.length(); if (sublen == 0) { return s; } int i = s.indexOf(sub, c); if (i == -1) { return s; } StringBuilder sb = new StringBuilder(s.length()); do { sb.append(s.substring(c, i)); c = i + sublen; } while ((i = s.indexOf(sub, c)) != -1); if (c < s.length()) { sb.append(s.substring(c, s.length())); } return sb.toString(); } /** * Removes all characters contained in provided string. * * @param src source string * @param chars string containing characters to remove */ public static String removeChars(String src, String chars) { int i = src.length(); StringBuilder sb = new StringBuilder(i); for (int j = 0; j < i; j++) { char c = src.charAt(j); if (chars.indexOf(c) == -1) { sb.append(c); } } return sb.toString(); } /** * Removes set of characters from string. * * @param src string * @param chars characters to remove */ public static String removeChars(String src, char... chars) { int i = src.length(); StringBuilder sb = new StringBuilder(i); mainloop: for (int j = 0; j < i; j++) { char c = src.charAt(j); for (char aChar : chars) { if (c == aChar) { continue mainloop; } } sb.append(c); } return sb.toString(); } /** * Removes a single character from string. * * @param string source string * @param ch character to remove */ public static String remove(String string, char ch) { int stringLen = string.length(); char[] result = new char[stringLen]; int offset = 0; for (int i = 0; i < stringLen; i++) { char c = string.charAt(i); if (c == ch) { continue; } result[offset] = c; offset++; } return new String(result, 0, offset); } // ---------------------------------------------------------------- miscellaneous /** * Compares 2 strings. If one of the strings is <code>null</code>, <code>false</code> is returned. if * both string are <code>null</code>, <code>true</code> is returned. * * @param s1 first string to compare * @param s2 second string * * @return <code>true</code> if strings are equal, otherwise <code>false</code> */ public static boolean equals(String s1, String s2) { return ObjectUtil.equals(s1, s2); } /** * Determines if a string is empty (<code>null</code> or zero-length). */ public static boolean isEmpty(String string) { return ((string == null) || (string.length() == 0)); } /** * Determines if string array contains empty strings. * @see #isEmpty(String) */ public static boolean isAllEmpty(String... strings) { for (String string : strings) { if (isEmpty(string) == false) { return false; } } return true; } /** * Determines if a string is blank (<code>null</code> or {@link #containsOnlyWhitespaces(String)}). */ public static boolean isBlank(String string) { return ((string == null) || containsOnlyWhitespaces(string)); } /** * Determines if string is not blank. */ public static boolean isNotBlank(String string) { return ((string != null) && !containsOnlyWhitespaces(string)); } /** * Determines if string array contains just blank strings. */ public static boolean isAllBlank(String... strings) { for (String string : strings) { if (isBlank(string) == false) { return false; } } return true; } /** * Returns <code>true</code> if string contains only white spaces. */ public static boolean containsOnlyWhitespaces(String string) { int size = string.length(); for (int i = 0; i < size; i++) { char c = string.charAt(i); if (CharUtil.isWhitespace(c) == fal