//如果涉及到到该类中涉及到的其他功能,请在我的博客中用相应的类名进行搜索
public abstract class StringUtil {
public static final String EMPTY = “”;
public static final String WHITESPACE = ” \n\r\f\t”;
public static boolean isNotEmpty(String string) {
return (string != null) && (string.length() > 0);
}
/**
* Check that the given CharSequence is neither <code>null</code> nor of length 0. Note: Will return <code>true</code> for a CharSequence that purely consists of whitespace.
* <p>
*
* <pre>
* StringUtils.hasLength(null) = false
* StringUtils.hasLength(“”) = false
* StringUtils.hasLength(” “) = true
* StringUtils.hasLength(“Hello”) = true
* </pre>
*
* @param str the CharSequence to check (may be <code>null</code>)
* @return <code>true</code> if the CharSequence is not null and has length
* @see #hasText(String)
*/
public static boolean isNotEmpty(CharSequence str) {
return ((str != null) && (str.length() > 0));
}
public static boolean isNullOrEmpty(String string) {
return (string == null) || (string.length() == 0);
}
/**
* 判断字符串是否是Boolean类型 所有非true/false的字符串或null都返回false
*
* @param bStr 字符串类型的boolean,大小写不敏感
* @return Boolean
*/
public static Boolean isBoolean(String bStr) {
if (bStr == null) {
return false;
}
String t = bStr.trim();
if (t.length() <= 0) {
return false;
}
if (t.equalsIgnoreCase(“true”) || t.equalsIgnoreCase(“false”)) {
return true;
}
return false;
}
/**
* 判断字符串是否是”false”
*
* @param bStr 大小写不敏感
* @return Boolean
*/
public static Boolean isFalse(String bStr) {
if (!isBoolean(bStr)) {
return false;
}
if (bStr.trim().equalsIgnoreCase(“false”)) {
return true;
}
return false;
}
/**
* 判断给定字符串是否是”true”
*
* @param bStr 大小写不敏感
* @return Boolean
*/
public static Boolean isTrue(String bStr) {
if (!isBoolean(bStr)) {
return false;
}
if (bStr.trim().equalsIgnoreCase(“true”)) {
return true;
}
return false;
}
/**
* Check whether the given CharSequence contains any whitespace characters.
*
* @param str the CharSequence to check (may be <code>null</code>)
* @return <code>true</code> if the CharSequence is not empty and contains at least 1 whitespace character
* @see java.lang.Character#isWhitespace
*/
public static boolean isWhitespace(CharSequence str) {
if (!isNotEmpty(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Check whether the given String contains any whitespace characters.
*
* @param str the String to check (may be <code>null</code>)
* @return <code>true</code> if the String is not empty and contains at least 1 whitespace character
* @see #isWhitespace(CharSequence)
*/
public static boolean isWhitespace(String str) {
return isWhitespace((CharSequence) str);
}
/**
* Check whether the given CharSequence has actual text. More specifically, returns <code>true</code> if the string not <code>null</code>, its length is greater than 0, and it contains at least
* one non-whitespace character.
* <p>
*
* <pre>
* StringUtils.hasText(null) = false
* StringUtils.hasText(“”) = false
* StringUtils.hasText(” “) = false
* StringUtils.hasText(“12345”) = true
* StringUtils.hasText(” 12345 “) = true
* </pre>
*
* @param str the CharSequence to check (may be <code>null</code>)
* @return <code>true</code> if the CharSequence is not <code>null</code>, its length is greater than 0, and it does not contain whitespace only
* @see java.lang.Character#isWhitespace
*/
public static boolean hasText(CharSequence str) {
if (!isNotEmpty(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Check whether the given String has actual text. More specifically, returns <code>true</code> if the string not <code>null</code>, its length is greater than 0, and it contains at least one
* non-whitespace character.
*
* @param str the String to check (may be <code>null</code>)
* @return <code>true</code> if the String is not <code>null</code>, its length is greater than 0, and it does not contain whitespace only
* @see #hasText(CharSequence)
*/
public static boolean hasText(String str) {
return hasText((CharSequence) str);
}
/**
* 判断字符串第一字母是否是小写
*/
public static Boolean isFirstLetterLower(String str) {
return Character.isLowerCase(str.trim().subSequence(0, 1).charAt(0));
}
// ———————————————————————
// Convenience methods for working with formatted Strings
// ———————————————————————
/**
* 判断字符串第一字母是否是大写
*/
public static Boolean isFirstLetterUpper(String str) {
return Character.isUpperCase(str.trim().subSequence(0, 1).charAt(0));
}
/**
* Test if the given String ends with the specified suffix, ignoring upper/lower case.
*
* @param str the String to check
* @param suffix the suffix to look for
* @see java.lang.String#endsWith
*/
public static boolean isEndsWithIgnoreCase(String str, String suffix) {
if ((str == null) || (suffix == null)) {
return false;
}
if (str.endsWith(suffix)) {
return true;
}
if (str.length() < suffix.length()) {
return false;
}
String lcStr = str.substring(str.length() – suffix.length()).toLowerCase();
String lcSuffix = suffix.toLowerCase();
return lcStr.equals(lcSuffix);
}
// ———————————————————————
// Convenience methods for working with String arrays
// ———————————————————————
/**
* Test if the given String starts with the specified prefix, ignoring upper/lower case.
*
* @param str the String to check
* @param prefix the prefix to look for
* @see java.lang.String#startsWith
*/
public static boolean isStartsWithIgnoreCase(String str, String prefix) {
if ((str == null) || (prefix == null)) {
return false;
}
if (str.startsWith(prefix)) {
return true;
}
if (str.length() < prefix.length()) {
return false;
}
String lcStr = str.substring(0, prefix.length()).toLowerCase();
String lcPrefix = prefix.toLowerCase();
return lcStr.equals(lcPrefix);
}
public static int lastIndexOfLetter(String string) {
for (int i = string.length() – 1; i > 0; i–) {
char character = string.charAt(i);
if (Character.isLetter(character)) {
return i;
}
}
return -1;
}
/**
* Count the occurrences of the substring in string s.
*
* @param str string to search in. Return 0 if this is null.
* @param sub string to search for. Return 0 if this is null.
*/
public static int countOccurrencesOf(String str, String sub) {
if ((str == null) || (sub == null) || (str.length() == 0) || (sub.length() == 0)) {
return 0;
}
int count = 0;
int pos = 0;
int idx;
while ((idx = str.indexOf(sub, pos)) != -1) {
++count;
pos = idx + sub.length();
}
return count;
}
public static int countUnquoted(String string, char character) {
if (‘\” == character) {
throw new IllegalArgumentException(“Unquoted count of quotes is invalid”);
}
if (string == null) {
return 0;
}
// Impl note: takes advantage of the fact that an escpaed single quote
// embedded within a quote-block can really be handled as two seperate
// quote-blocks for the purposes of this method…
int count = 0;
int stringLength = string.length();
boolean inQuote = false;
for (int indx = 0; indx < stringLength; indx++) {
char c = string.charAt(indx);
if (inQuote) {
if (‘\” == c) {
inQuote = false;
}
} else if (‘\” == c) {
inQuote = true;
} else if (c == character) {
count++;
}
}
return count;
}
public static String[] join(String[] x, String sep, String[] y) {
String[] result = new String[x.length];
for (int i = 0; i < x.length; i++) {
result[i] = x[i] + sep + y[i];
}
return result;
}
/**
* Concatenate the given String arrays into one, with overlapping array elements included twice.
* <p>
* The order of elements in the original arrays is preserved.
*
* @param array1 the first array (can be <code>null</code>)
* @param array2 the second array (can be <code>null</code>)
* @return the new array (<code>null</code> if both given arrays were <code>null</code>)
*/
public static String[] join(String[] array1, String[] array2) {
if (ObjectUtil.isNullOrEmpty(array1)) {
return array2;
}
if (ObjectUtil.isNullOrEmpty(array2)) {
return array1;
}
String[] newArr = new String[array1.length + array2.length];
System.arraycopy(array1, 0, newArr, 0, array1.length);
System.arraycopy(array2, 0, newArr, array1.length, array2.length);
return newArr;
}
/**
* Convenience method to return a String array as a CSV String. E.g. useful for <code>toString()</code> implementations.
*
* @param arr the array to display
* @return the delimited String
*/
public static String join(Object[] arr) {
return join(arr, “,”);
}
/**
* Convenience method to return a String array as a delimited (e.g. CSV) String. E.g. useful for <code>toString()</code> implementations.
*
* @param arr the array to display
* @param delim the delimiter to use (probably a “,”)
* @return the delimited String
*/
public static String join(Object[] arr, String delim) {
if (ObjectUtil.isNullOrEmpty(arr)) {
return “”;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < arr.length; i++) {
if (i > 0) {
sb.append(delim);
}
sb.append(arr[i]);
}
return sb.toString();
}
@SuppressWarnings(“rawtypes”)
public static String join(String seperator, Iterator objects) {
StringBuffer buf = new StringBuffer();
if (objects.hasNext()) {
buf.append(objects.next());
}
while (objects.hasNext()) {
buf.append(seperator).append(objects.next());
}
return buf.toString();
}
public static String join(String seperator, String[] strings) {
int length = strings.length;
if (length == 0) {
return “”;
}
StringBuffer buf = new StringBuffer(length * strings[0].length()).append(strings[0]);
for (int i = 1; i < length; i++) {
buf.append(seperator).append(strings[i]);
}
return buf.toString();
}
/**
* Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for <code>toString()</code> implementations.
*
* @param coll the Collection to display
* @param delim the delimiter to use (probably a “,”)
* @param prefix the String to start each element with
* @param suffix the String to end each element with
* @return the delimited String
*/
public static String join(Collection<?> coll, String delim, String prefix, String suffix) {
if (ObjectUtil.isNullOrEmpty(coll)) {
return “”;
}
StringBuilder sb = new StringBuilder();
Iterator<?> it = coll.iterator();
while (it.hasNext()) {
sb.append(prefix).append(it.next()).append(suffix);
if (it.hasNext()) {
sb.append(delim);
}
}
return sb.toString();
}
/**
* Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for <code>toString()</code> implementations.
*
* @param coll the Collection to display
* @param delim the delimiter to use (probably a “,”)
* @return the delimited String
*/
public static String join(Collection<?> coll, String delim) {
return join(coll, delim, “”, “”);
}
/**
* Convenience method to return a Collection as a CSV String. E.g. useful for <code>toString()</code> implementations.
*
* @param coll the Collection to display
* @return the delimited String
*/
public static String join(Collection<?> coll) {
return join(coll, “,”);
}
/**
* Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.
*
* @param array the array to append to (can be <code>null</code>)
* @param str the String to append
* @return the new array (never <code>null</code>)
*/
public static String[] append(String[] array, String str) {
if (ObjectUtil.isNullOrEmpty(array)) {
return new String[] { str };
}
String[] newArr = new String[array.length + 1];
System.arraycopy(array, 0, newArr, 0, array.length);
newArr[array.length] = str;
return newArr;
}
/**
* Merge the given String arrays into one, with overlapping array elements only included once.
* <p>
* The order of elements in the original arrays is preserved (with the exception of overlapping elements, which are only included on their first occurrence).
*
* @param array1 the first array (can be <code>null</code>)
* @param array2 the second array (can be <code>null</code>)
* @return the new array (<code>null</code> if both given arrays were <code>null</code>)
*/
public static String[] merge(String[] array1, String[] array2) {
if (ObjectUtil.isNullOrEmpty(array1)) {
return array2;
}
if (ObjectUtil.isNullOrEmpty(array2)) {
return array1;
}
List<String> result = new ArrayList<String>();
result.addAll(Arrays.asList(array1));
for (String str : array2) {
if (!result.contains(str)) {
result.add(str);
}
}
return toStringArray(result);
}
/**
* Take a String which is a delimited list and convert it to a String array.
* <p>
* A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters – in contrast to
* <code>tokenizeToStringArray</code>.
*
* @param str the input String
* @param delimiter the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
* @return an array of the tokens in the list
* @see StringUtilBf#tokenizeToStringArray
*/
public static String[] split(String str, String delimiter) {
if (StringUtil.isNullOrEmpty(str)) {
return null;
}
return str.split(delimiter);
}
/**
* Split a String at the first occurrence of the delimiter. Does not include the delimiter in the result.
*
* @param toSplit the string to split
* @param delimiter to split the string up with
* @return a two element array with index 0 being before the delimiter, and index 1 being after the delimiter (neither element includes the delimiter); or <code>null</code> if the delimiter wasn’t
* found in the given input String
*/
/*
* public static String[] split(String toSplit, String delimiter) { if (!hasLength(toSplit) || !hasLength(delimiter)) { return null; } int offset = toSplit.indexOf(delimiter); if (offset < 0) {
* return null; } String beforeDelimiter = toSplit.substring(0, offset); String afterDelimiter = toSplit.substring(offset + delimiter.length()); return new String[] { beforeDelimiter,
* afterDelimiter }; } public static String[] split(String seperators, String list) { return StringUtilBf.split(seperators, list, false); }
*/
/**
* Take a String which is a delimited list and convert it to a String array.
* <p>
* A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters – in contrast to
* <code>tokenizeToStringArray</code>.
*
* @param str the input String
* @param delimiter the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
* @param charsToDelete a set of characters to delete. Useful for deleting unwanted line breaks: e.g. “\r\n\f” will delete all new lines and line feeds in a String.
* @return an array of the tokens in the list
* @see StringUtilBf#tokenizeToStringArray
*/
public static String[] split(String str, String delimiter, String charsToDelete) {
if (str == null) {
return new String[0];
}
if (delimiter == null) {
return new String[] { str };
}
List<String> result = new ArrayList<String>();
if (“”.equals(delimiter)) {
for (int i = 0; i < str.length(); i++) {
result.add(deleteAny(str.substring(i, i + 1), charsToDelete));
}
} else {
int pos = 0;
int delPos;
while ((delPos = str.indexOf(delimiter, pos)) != -1) {
result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
pos = delPos + delimiter.length();
}
if ((str.length() > 0) && (pos <= str.length())) {
// Add rest of String, but not in case of empty input.
result.add(deleteAny(str.substring(pos), charsToDelete));
}
}
return toStringArray(result);
}
/* *//**
* 根据指定正则表达式，分隔字符串
*
* @param targetString 目标字符串
* @param regex 正则
* @return 分隔后的字符串数组
*/
/* *//**
* Delete all occurrences of the given substring.
*
* @param inString the original String
* @param pattern the pattern to delete all occurrences of
* @return the resulting String
*/
/**
* Delete any character in a given String.
*
* @param inString the original String
* @param charsToDelete a set of characters to delete. E.g. “az\n” will delete ‘a’s, ‘z’s and new lines.
* @return the resulting String
*/
static String deleteAny(String inString, String charsToDelete) {
if (isNullOrEmpty(inString) || isNullOrEmpty(charsToDelete)) {
return inString;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < inString.length(); i++) {
char c = inString.charAt(i);
if (charsToDelete.indexOf(c) == -1) {
sb.append(c);
}
}
return sb.toString();
}
public static String repeat(char character, int times) {
if (times <= 1) {
return Character.toString(character);
}
char[] buffer = new char[times];
Arrays.fill(buffer, character);
return new String(buffer);
}
public static String repeat(String string, int times) {
if (isNullOrEmpty(string) || times <= 1) {
return string;
}
StringBuffer buf = new StringBuffer(string.length() * times);
for (int i = 0; i < times; i++) {
buf.append(string);
}
return buf.toString();
}
/**
* 替换字串,指定替换次数.
*
* @param oldStr 要进行替换的原字串
* @param findStr 查找的字串
* @param replStr 替换为的字串
* @param times 次数
* @return 替换后的字串
*/
/*
* public static String replace(String oldStr, String findStr, String replStr, int times) { if ((oldStr == null) || (oldStr.length() < 1) || (findStr == null) || (findStr.length() < 1) || (replStr
* == null) || findStr.equals(replStr)) { return oldStr; } StringBuffer strBuff = new StringBuffer(); if (times < 1) { // 替换所有 if ((findStr.length() == 1) && (replStr.length() == 1)) { // 单字符替换
* return oldStr.replace(findStr.charAt(0), replStr.charAt(0)); } else { // 多字符替换 for (int i = 0, len = oldStr.length(); i < len;) { int j = oldStr.indexOf(findStr, i); if (j >= 0) {// 找到要替换的字串
* strBuff = strBuff.append(oldStr.substring(i, j)); strBuff = strBuff.append(replStr); i = j + findStr.length(); } else {// 找不到要替换的字串 strBuff = strBuff.append(oldStr.substring(i)); break; } }
* return new String(strBuff); } } else { // 替换指定次数 int i = 0; int len = oldStr.length(); for (int k = 0; (i < len) && (k < times);) { int j = oldStr.indexOf(findStr, i); if (j >= 0) {// 找到要替换的字串
* strBuff = strBuff.append(oldStr.substring(i, j)); strBuff = strBuff.append(replStr); i = j + findStr.length(); k++; } else {// 找不到要替换的字串 strBuff = strBuff.append(oldStr.substring(i)); i = len;
* } } if (i < len) { // 完成替换次数，但串中还有可替换的字串 strBuff = strBuff.append(oldStr.substring(i)); } return new String(strBuff); } }
*/
/**
* 替换所有字串
*
* @param oldStr 要进行替换的原字串
* @param findStr 查找的字串
* @param replStr 替换为的字串
* @return 替换后的字串
*/
/**
* Replace all occurences of a substring within a string with another string.
*
* @param inString String to examine
* @param oldPattern String to replace
* @param newPattern String to insert
* @return a String with the replacements
*/
/*
* public static String replace(String inString, String oldPattern, String newPattern) { if (!hasLength(inString) || !hasLength(oldPattern) || (newPattern == null)) { return inString; }
* StringBuilder sb = new StringBuilder(); int pos = 0; // our position in the old string int index = inString.indexOf(oldPattern); // the index of an occurrence we’ve found, or -1 int patLen =
* oldPattern.length(); while (index >= 0) { sb.append(inString.substring(pos, index)); sb.append(newPattern); pos = index + patLen; index = inString.indexOf(oldPattern, pos); }
* sb.append(inString.substring(pos)); // remember to append any characters to the right of a match return sb.toString(); }
*/
public static String replace(String template, String placeholder, String replacement) {
return replace(template, placeholder, replacement, false);
}
public static String[] replace(String templates[], String placeholder, String replacement) {
String[] result = new String[templates.length];
for (int i = 0; i < templates.length; i++) {
result[i] = replace(templates[i], placeholder, replacement);
}
return result;
}
public static String replace(String template, String placeholder, String replacement, boolean wholeWords) {
if (template == null) {
return template; // returnign null!
}
int loc = template.indexOf(placeholder);
if (loc < 0) {
return template;
} else {
final boolean actuallyReplace = !wholeWords || ((loc + placeholder.length()) == template.length()) || !Character.isJavaIdentifierPart(template.charAt(loc + placeholder.length()));
String actualReplacement = actuallyReplace ? replacement : placeholder;
return new StringBuffer(template.substring(0, loc)).append(actualReplacement).append(replace(template.substring(loc + placeholder.length()), placeholder, replacement, wholeWords))
.toString();
}
}
public static String replaceOnce(String template, String placeholder, String replacement) {
if (template == null) {
return template; // returnign null!
}
int loc = template.indexOf(placeholder);
if (loc < 0) {
return template;
} else {
return new StringBuffer(template.substring(0, loc)).append(replacement).append(template.substring(loc + placeholder.length())).toString();
}
}
/**
* Test whether the given string matches the given substring at the given index.
*
* @param str the original string (or StringBuilder)
* @param index the index in the original string to start matching against
* @param substring the substring to match at the given index
*/
public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
for (int j = 0; j < substring.length(); j++) {
int i = index + j;
if ((i >= str.length()) || (str.charAt(i) != substring.charAt(j))) {
return false;
}
}
return true;
}
private static String suffix(String name, String suffix) {
return (suffix == null) ? name : name + suffix;
}
public static String[] suffix(String[] columns, String suffix) {
if (suffix == null) {
return columns;
}
String[] qualified = new String[columns.length];
for (int i = 0; i < columns.length; i++) {
qualified[i] = suffix(columns[i], suffix);
}
return qualified;
}
/**
* Parse the given <code>localeString</code> value into a {@link Locale}.
* <p>
* This is the inverse operation of {@link Locale#toString Locale’s toString}.
*
* @param localeString the locale string, following <code>Locale’s</code> <code>toString()</code> format (“en”, “en_UK”, etc); also accepts spaces as separators, as an alternative to underscores
* @return a corresponding <code>Locale</code> instance
*/
public static Locale parseLocaleString(String localeString) {
for (int i = 0; i < localeString.length(); i++) {
char ch = localeString.charAt(i);
if ((ch != ‘_’) && (ch != ‘ ‘) && !Character.isLetterOrDigit(ch)) {
throw new IllegalArgumentException(“Locale value \”” + localeString + “\” contains invalid characters”);
}
}
String[] parts = localeString.split(“_”);
String language = (parts.length > 0 ? parts[0] : “”);
String country = (parts.length > 1 ? parts[1] : “”);
String variant = “”;
if (parts.length >= 2) {
// There is definitely a variant, and it is everything after the
// country
// code sans the separator between the country code and the variant.
int endIndexOfCountryCode = localeString.indexOf(country) + country.length();
// Strip off any leading ‘_’ and whitespace, what’s left is the
// variant.
variant = trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode));
if (variant.startsWith(“_”)) {
variant = trimLeadingCharacter(variant, ‘_’);
}
}
return (language.length() > 0 ? new Locale(language, country, variant) : null);
}
/**
* Determine the RFC 3066 compliant language tag, as used for the HTTP “Accept-Language” header.
*
* @param locale the Locale to transform to a language tag
* @return the RFC 3066 compliant language tag as String
*/
public static String toLanguageTag(Locale locale) {
return locale.getLanguage() + (hasText(locale.getCountry()) ? “-” + locale.getCountry() : “”);
}
public static String toLowerCase(String str) {
return str == null ? null : str.toLowerCase();
}
/**
* 把字符串第一个字母小写
*/
public static String toLowerFirstLetter(String targetStr) {
String firstLetter = targetStr.substring(0, 1);
return targetStr.replaceFirst(firstLetter, firstLetter.toLowerCase());
}
public static String toUpperCase(String str) {
return str == null ? null : str.toUpperCase();
}
/**
* 把字符串第一个字母大写
*/
public static String toUpperFirstLetter(String targetStr) {
String firstLetter = targetStr.substring(0, 1);
return targetStr.replaceFirst(firstLetter, firstLetter.toUpperCase());
}
/**
* Copy the given Collection into a String array. The Collection must contain String elements only.
*
* @param collection the Collection to copy
* @return the String array (<code>null</code> if the passed-in Collection was <code>null</code>)
*/
public static String[] toStringArray(Collection<String> collection) {
if (collection == null) {
return null;
}
return collection.toArray(new String[collection.size()]);
}
/**
* Copy the given Enumeration into a String array. The Enumeration must contain String elements only.
*
* @param enumeration the Enumeration to copy
* @return the String array (<code>null</code> if the passed-in Enumeration was <code>null</code>)
*/
public static String[] toStringArray(Enumeration<String> enumeration) {
if (enumeration == null) {
return null;
}
List<String> list = Collections.list(enumeration);
return list.toArray(new String[list.size()]);
}
/**
* Trim <i>all</i> whitespace from the given String: leading, trailing, and inbetween characters.
*
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimAllWhitespace(String str) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
int index = 0;
while (sb.length() > index) {
if (Character.isWhitespace(sb.charAt(index))) {
sb.deleteCharAt(index);
} else {
index++;
}
}
return sb.toString();
}
/**
* Trim the elements of the given String array, calling <code>String.trim()</code> on each of them.
*
* @param array the original String array
* @return the resulting array (of the same size) with trimmed elements
*/
public static String[] trimArrayElements(String[] array) {
if (ObjectUtil.isNullOrEmpty(array)) {
return new String[0];
}
String[] result = new String[array.length];
for (int i = 0; i < array.length; i++) {
String element = array[i];
result[i] = (element != null ? element.trim() : null);
}
return result;
}
/**
* Trim all occurences of the supplied leading character from the given String.
*
* @param str the String to check
* @param leadingCharacter the leading character to be trimmed
* @return the trimmed String
*/
public static String trimLeadingCharacter(String str, char leadingCharacter) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while ((sb.length() > 0) && (sb.charAt(0) == leadingCharacter)) {
sb.deleteCharAt(0);
}
return sb.toString();
}
/**
* Trim leading whitespace from the given String.
*
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimLeadingWhitespace(String str) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while ((sb.length() > 0) && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
return sb.toString();
}
/**
* Trim all occurences of the supplied trailing character from the given String.
*
* @param str the String to check
* @param trailingCharacter the trailing character to be trimmed
* @return the trimmed String
*/
public static String trimTrailingCharacter(String str, char trailingCharacter) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while ((sb.length() > 0) && (sb.charAt(sb.length() – 1) == trailingCharacter)) {
sb.deleteCharAt(sb.length() – 1);
}
return sb.toString();
}
/**
* Trim trailing whitespace from the given String.
*
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimTrailingWhitespace(String str) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while ((sb.length() > 0) && Character.isWhitespace(sb.charAt(sb.length() – 1))) {
sb.deleteCharAt(sb.length() – 1);
}
return sb.toString();
}
/**
* Trim leading and trailing whitespace from the given String.
*
* @param str the String to check
* @return the trimmed String
* @see java.lang.Character#isWhitespace
*/
public static String trimWhitespace(String str) {
if (isNullOrEmpty(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while ((sb.length() > 0) && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
while ((sb.length() > 0) && Character.isWhitespace(sb.charAt(sb.length() – 1))) {
sb.deleteCharAt(sb.length() – 1);
}
return sb.toString();
}
public static String truncate(String string, int length) {
if (string.length() <= length) {
return string;
} else {
return string.substring(0, length);
}
}
/**
* Capitalize a <code>String</code>, changing the first letter to upper case as per {@link Character#toUpperCase(char)}. No other letters are changed.
*
* @param str the String to capitalize, may be <code>null</code>
* @return the capitalized String, <code>null</code> if null
*/
public static String capitalize(String str) {
return changeFirstCharacterCase(str, true);
}
private static String changeFirstCharacterCase(String str, boolean capitalize) {
if ((str == null) || (str.length() == 0)) {
return str;
}
StringBuilder sb = new StringBuilder(str.length());
if (capitalize) {
sb.append(Character.toUpperCase(str.charAt(0)));
} else {
sb.append(Character.toLowerCase(str.charAt(0)));
}
sb.append(str.substring(1));
return sb.toString();
}
/**
* Uncapitalize a <code>String</code>, changing the first letter to lower case as per {@link Character#toLowerCase(char)}. No other letters are changed.
*
* @param str the String to uncapitalize, may be <code>null</code>
* @return the uncapitalized String, <code>null</code> if null
*/
public static String uncapitalize(String str) {
return changeFirstCharacterCase(str, false);
}
/**
* Decode a {@link java.math.BigInteger} from a {@link String} value. Supports decimal, hex and octal notation.
*
* @see BigInteger#BigInteger(String, int)
*/
static BigInteger decodeBigInteger(String value) {
int radix = 10;
int index = 0;
boolean negative = false;
// Handle minus sign, if present.
if (value.startsWith(“-“)) {
negative = true;
index++;
}
// Handle radix specifier, if present.
if (value.startsWith(“0x”, index) || value.startsWith(“0X”, index)) {
index += 2;
radix = 16;
} else if (value.startsWith(“#”, index)) {
index++;
radix = 16;
} else if (value.startsWith(“0”, index) && (value.length() > (1 + index))) {
index++;
radix = 8;
}
BigInteger result = new BigInteger(value.substring(index), radix);
return (negative ? result.negate() : result);
}
public static String unqualify(String qualifiedName) {
int loc = qualifiedName.lastIndexOf(“.”);
return (loc < 0) ? qualifiedName : qualifiedName.substring(qualifiedName.lastIndexOf(“.”) + 1);
}
public static String[] qualify(String prefix, String[] names) {
if (prefix == null)
return names;
int len = names.length;
String[] qualified = new String[len];
for (int i = 0; i < len; i++) {
qualified[i] = qualify(prefix, names[i]);
}
return qualified;
}
public static String qualify(String prefix, String name) {
if (name == null || prefix == null) {
throw new NullPointerException();
}
return new StringBuilder(prefix.length() + name.length() + 1).append(prefix).append(‘.’).append(name).toString();
}
public static String qualifier(String qualifiedName) {
int loc = qualifiedName.lastIndexOf(“.”);
return (loc < 0) ? “” : qualifiedName.substring(0, loc);
}
/**
* make person_id to personId
*
* @param entity
* @param propertyNames
* @return
*/
public static String formatKey(String key) {
int length = key.length();
if (key.indexOf(“_”) < 0) {
return key;
}
for (int i = 0; i < length; i++) {
char c = key.charAt(i);
int m = key.indexOf(“_”);
if (String.valueOf(c).equals(“_”)) {
String oldString = key.substring(m, m + 2);
key = key.replaceFirst(oldString, String.valueOf(Character.toUpperCase(key.charAt(m + 1))));
length–;
}
}
return key;
}
public static boolean isEmpty(String str) {
return null == str || “” == str || str.equals(“”) || str.length() == 0 ? true : false;
}
public static String[] split(String str) {
if (isEmpty(str))
return null;
String strOne = str;
String[] strArray = new String[str.length()];
int i = 0;
while (strOne.length() > 0) {
strArray[i] = strOne.substring(0, 1);
strOne = str.substring(i + 1);
i++;
}
return strArray;
}
/**
* 不区分大写小替换字符串
*
* @precondition 调用方法的前提条件写在这，分行写。
* @param srcStr 字符串
* @param regex 将被替换的串
* @param replacement 将替换其它串的串
* @return
* @see xxxClass#xxxMethod
* @since 1.0
* @todo 未完成的事项
*/
public static String replaceAllIgnoreCase(String srcStr, String regex, String replacement) {
Matcher m = Pattern.compile(regex, Pattern.CASE_INSENSITIVE).matcher(srcStr);
String result = m.replaceAll(replacement);
return result;
}
/**
* 计算字符串中子字符串的个数据
*
* @precondition 调用方法的前提条件写在这，分行写。
* @param srcStr
* @param subStr
* @return
* @see xxxClass#xxxMethod
* @since 1.0
* @todo 未完成的事项
*/
public static int getSubCount(String srcStr, String subStr) {
int count = 0;
Matcher m = Pattern.compile(subStr).matcher(srcStr);
while (m.find()) {
count++;
}
return count;
}
/**
* 将首字符转换成小写
*
* @param str
* @return
*/
public static String lowFirstChar(String str) {
if (StringUtil.isEmpty(str)) {
return str;
}
return Character.toLowerCase(str.charAt(0)) + str.substring(1);
}
/**
* 将驼峰模式转换成下划线模式
*
* @param attr
* @return
*/
public static String attrToColumn(String attr) {
if (null == attr || attr.trim().equals(“”))
return null;
StringBuffer sb = new StringBuffer();
for (int i = 0; i < attr.length(); i++) {
if (attr.charAt(i) >= ‘A’ && attr.charAt(i) <= ‘Z’) {
sb.append(“_” + Character.toLowerCase(attr.charAt(i)));
} else {
sb.append(attr.charAt(i));
}
}
return sb.toString();
}
/**
* 将下划线模式转换成驼峰模式
*
* @param attr
* @param firstBig 是否首字符大写
* @return
*/
public static String columnToAttr(String attr, boolean firstBig) {
if (null == attr || attr.trim().equals(“”))
return null;
StringBuffer sb = new StringBuffer();
String[] ss = attr.split(“_”);
for (int i = 0; i < ss.length; i++) {
if (i == 0 && !firstBig) {
sb.append(ss[i].toLowerCase().substring(0));
} else {
sb.append(Character.toUpperCase(ss[i].charAt(0))).append(ss[i].toLowerCase().substring(1));
}
}
return sb.toString();
}
/**
* 将首字符转换成大写
*
* @param str
* @return
*/
public static String upFirstChar(String str) {
if (StringUtil.isEmpty(str)) {
return str;
}
return Character.toUpperCase(str.charAt(0)) + str.substring(1);
}
public static boolean equals(String string, String calcTimeIndex) {
if (null == string)
return false;
if (null == calcTimeIndex)
return false;
return string.equals(calcTimeIndex);
}
// 求两个字符串数组的并集，利用set的元素唯一性
public static String[] union(String[] arr1, String[] arr2) {
Set<String> set = new HashSet<String>();
for (String str : arr1) {
set.add(str);
}
for (String str : arr2) {
set.add(str);
}
String[] result = {};
return set.toArray(result);
}
// 求两个数组的交集
public static String[] intersect(String[] arr1, String[] arr2) {
Map<String, Boolean> map = new HashMap<String, Boolean>();
LinkedList<String> list = new LinkedList<String>();
for (String str : arr1) {
if (!map.containsKey(str)) {
map.put(str, Boolean.FALSE);
}
}
for (String str : arr2) {
if (map.containsKey(str)) {
map.put(str, Boolean.TRUE);
}
}
for (Entry<String, Boolean> e : map.entrySet()) {
if (e.getValue().equals(Boolean.TRUE)) {
list.add(e.getKey());
}
}
String[] result = {};
return list.toArray(result);
}
// 求两个数组的差集
public static String[] minus(String[] arr1, String[] arr2) {
LinkedList<String> list = new LinkedList<String>();
LinkedList<String> history = new LinkedList<String>();
String[] longerArr = arr1;
String[] shorterArr = arr2;
// 找出较长的数组来减较短的数组
if (arr1.length > arr2.length) {
longerArr = arr2;
shorterArr = arr1;
}
for (String str : longerArr) {
if (!list.contains(str)) {
list.add(str);
}
}
for (String str : shorterArr) {
if (list.contains(str)) {
history.add(str);
list.remove(str);
} else {
if (!history.contains(str)) {
list.add(str);
}
}
}
String[] result = {};
return list.toArray(result);
}
public static boolean findInSet(String str, String set) {
if (StringUtil.isNotEmpty(set) && set.contains(str)) {
for (String s : Splitter.on(‘,’).split(set)) {
if (str.equals(s))
return true;
}
}
return false;
}
public static boolean findInSet(String str, String[] set) {
if (null == str || null == set)
return false;
if (set.length == 0)
return false;
for (String string : set) {
if (str.equals(string))
return true;
}
return false;
}
public static String remove(String str, String set) {
if (null == str || null == set)
return null;
String[] ss = set.split(“,”);
return remove(str, ss);
}
/**
* 删除以逗号分隔的字符中的子串
*
* @param str
* @param set
* @return
*/
public static String remove(String str, String[] set) {
if (null == str || null == set)
return null;
if (set.length == 0)
return null;
List<String> userIdList = new ArrayList<String>(Arrays.asList(set));
userIdList.remove(str);
return join(userIdList, “,”);
}
public static String[] removeRepeat(String[] ss) {
Set<String> set = new HashSet<>();
for (int i = 0; i < ss.length; i++) {
if (StringUtil.isEmpty(ss[i]))
continue;
set.add(ss[i]);
}
String[] arrayResult = (String[]) set.toArray(new String[set.size()]);
return arrayResult;
}
public static String html2Text(String inputString, int length) {
if (StringUtil.isEmpty(inputString))
return StringUtil.EMPTY;
String str = html2Text(inputString);
return str.substring(0, str.length() > 500 ? 500 : str.length());
}
// public static void main(String[] args) {
// String s = “<p>11<img src=\”http://ghs.diddgame.com/tmp_d22e06fc4b4c4058f9a89ff9ad6751ad.jpg\” alt=\”图像\”></p><p></p>”
// + “<p><img src=\”http://ghs.diddgame.com/tmp_d22e06fc4b4c4058f9a89ff9ad6751ad.jpg\” alt=\”图像\”>我突突突突突突突突突突突突11</p>”;
// System.out.println(firstTextBeforeImg(s));
// }
public static String firstTextBeforeImg(String inputString) {
return firstTextBeforeImg(inputString, -1);
}
/**
* 获取图片前的文字,一直到存在为止
*
* @param inputString
* @param index
* @return
*/
private static String firstTextBeforeImg(String inputString, int index) {
if (!inputString.contains(“<img”)) {
return html2Text(inputString);
}
if (index >= inputString.length() || inputString.indexOf(“<img”, index + 1) == -1) {
return html2Text(inputString.substring(index));
}
int endIndex = inputString.indexOf(“<img”, index + 1);
if (endIndex == -1) {
return html2Text(inputString.substring(index + 1));
}
index = index == -1 ? 0 : index;
String str = inputString.substring(index, endIndex);
String result = html2Text(str);
if (StringUtil.isEmpty(result)) {
return firstTextBeforeImg(inputString, endIndex);
}
return result;
}
/**
* html转化为text,去除html标签
*
* @param inputString
* @return
*/
public static String html2Text(String inputString) {
if (StringUtil.isEmpty(inputString))
return StringUtil.EMPTY;
String htmlStr = inputString; // 含html标签的字符串
String textStr = “”;
try {
String regEx_script = “<[\\s]*?script[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?script[\\s]*?>”; // 定义script的正则表达式{或<script[^>]*?>[\\s\\S]*?<\\/script> }
String regEx_style = “<[\\s]*?style[^>]*?>[\\s\\S]*?<[\\s]*?\\/[\\s]*?style[\\s]*?>”; // 定义style的正则表达式{或<style[^>]*?>[\\s\\S]*?<\\/style> }
String regEx_special = “\\&[a-zA-Z]{1,10};”;// 定义一些特殊字符的正则表达式 如：  
String regEx_html = “<[^>]+>”; // 定义HTML标签的正则表达式
htmlStr = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll(“”); // 过滤script标签
htmlStr = Pattern.compile(regEx_style, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll(“”); // 过滤style标签
htmlStr = Pattern.compile(regEx_special, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll(“”); // 过滤style标签
htmlStr = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll(“”); // 过滤html标签
textStr = htmlStr.replace(” “, “”).replace(“\n”, “”).replace(“\t”, “”).trim();
} catch (Exception e) {
}
return textStr;// 返回文本字符串
}
public static String htmlFindImg(String inputString) {
StringBuffer sb = new StringBuffer(); // 用来存储获取到的图片地址
Pattern p = Pattern.compile(“<(img|IMG)(.*?)(>|></img>|/>)”);// 匹配字符串中的img标签
Matcher matcher = p.matcher(inputString);
boolean hasPic = matcher.find();
if (hasPic == true)// 判断是否含有图片
{
while (hasPic) // 如果含有图片，那么持续进行查找，直到匹配不到
{
String group = matcher.group(2);// 获取第二个分组的内容，也就是 (.*?)匹配到的
Pattern srcText = Pattern.compile(“(src|SRC)=(\”|\’)(.*?)(\”|\’)”);// 匹配图片的地址
Matcher matcher2 = srcText.matcher(group);
if (matcher2.find()) {
sb.append(“,” + matcher2.group(3));// 把获取到的图片地址添加到列表中
}
hasPic = matcher.find();// 判断是否还有img标签
}
}
return sb.length() > 0 ? sb.substring(1) : sb.toString();
}
/*
* 16进制数字字符集
*/
private static String hexString = “0123456789ABCDEF”;
/*
* 将字符串编码成16进制数字,适用于所有字符（包括中文）
*/
public static String encodeStrToHexstr(String str) {
// 根据默认编码获取字节数组
byte[] bytes = str.getBytes();
StringBuilder sb = new StringBuilder(bytes.length * 2);
// 将字节数组中每个字节拆解成2位16进制整数
for (int i = 0; i < bytes.length; i++) {
sb.append(hexString.charAt((bytes[i] & 0xf0) >> 4));
sb.append(hexString.charAt((bytes[i] & 0x0f) >> 0));
}
return sb.toString();
}
/*
* 将16进制数字解码成字符串,适用于所有字符（包括中文）
*/
public static String decodeHexstrToStr(String bytes) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length() / 2);
// 将每2位16进制整数组装成一个字节
for (int i = 0; i < bytes.length(); i += 2)
baos.write((hexString.indexOf(bytes.charAt(i)) << 4 | hexString.indexOf(bytes.charAt(i + 1))));
return new String(baos.toByteArray());
}
}
import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.google.common.base.Splitter;
// import java.util.Properties;