package org.theonefx.wcframework.utils;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;
/**
* @File : StringUtils.java
* @ClassName : StringUtils
* @Author : 陈曦
* @Date : 2012-2-6 上午10:37:37
* @Version : v2.0
* @Description : String工具类
*/
public class StringUtils {
private static final String FOLDER_SEPARATOR = "/";
private static final String WINDOWS_FOLDER_SEPARATOR = "\\";
private static final String TOP_PATH = "..";
private static final String CURRENT_PATH = ".";
private static final char EXTENSION_SEPARATOR = '.';
/**
* @Method : equal
* @author : 陈曦
* @date : 2011-12-8 下午03:03:09
* @Description : 判断两个字符串是否相等，且不可同时为null哦！
*/
public static boolean equal(String a, String b) {
return equal(a, b, true);
}
/**
* @Method : equal
* @author : 陈曦
* @date : 2011-12-8 下午03:03:09
* @param nullAllow 是否允许同时为空：当nullAllow为false时，如果a==null and b==null，那么方法将返回true
* @Description : 判断两个字符串是否相等
*/
public static boolean equal(String a, String b, boolean nullAllow) {
if(nullAllow){
if(a==null || b==null){
return false;
}
}
if (a == b) {
return true;
}
if (a != null) {
return a.equals(b);
} else {
return b == null;
}
}
/**
* @Method : isBlank
* @author : 陈曦
* @date : 2011-12-3 下午11:05:56
* @Description : 是不是为空白字符串
* <p>
* <pre>
* StringUtils.isBlank("") = true
* StringUtils.isBlank(null) = true
* StringUtils.isBlank(" ") = true
* </pre>
*/
public static boolean isBlank(CharSequence cs) {
if (null == cs)
return true;
int length = cs.length();
for (int i = 0; i < length; i++) {
if (!(Character.isWhitespace(cs.charAt(i))))
return false;
}
return true;
}
public static boolean isNotBlank(CharSequence s) {
return !isBlank(s);
}
/**
* @Method : getFirstNotEmpty
* @author : 陈曦
* @date : 2011-12-3 下午10:36:46
* @Description : 返回第一个不是空白字符串的String，如果都是空白字符串则返回字符串"null"。
*/
public static CharSequence getFirstNotBlank(CharSequence... strs) {
if (strs == null) {
return "null";
}
for (int i = 0; i < strs.length; i++) {
CharSequence str = strs[i];
if (isNotBlank(str)) {
return str;
}
}
return "null";
}
/**
* @Method : isEmpty
* @author : 陈曦
* @date : 2011-12-3 下午11:41:20
* @Description : 检查给定的字符序列是否为空。
*/
public static boolean isEmpty(CharSequence str) {
return (str == null || str.length() == 0);
}
/**
* @Method : isEmpty
* @author : 陈曦
* @date : 2011-12-3 下午11:41:20
* @Description : 检查给定的字符序列既不是一个null同时长度也不为0。<br>
* 注意，如果所有字符都是空白字符的话将会返回true
* <pre>
* StringUtils.isNotEmpty(null) = false
* StringUtils.isNotEmpty("") = false
* StringUtils.isNotEmpty(" ") = true
* StringUtils.isNotEmpty("Hello") = true
* </pre>
* @see #isNotBlank(CharSequence)
*/
public static boolean isNotEmpty(CharSequence str) {
return !isEmpty(str);
}
/**
* @Method : getFirstNotEmpty
* @author : 陈曦
* @date : 2011-12-3 下午10:36:46
* @Description : 返回第一个有内容的String，如果没有内容则返回字符串"null"。
*/
public static CharSequence getFirstNotEmpty(CharSequence... strs) {
if (strs == null) {
return "null";
}
for (int i = 0; i < strs.length; i++) {
CharSequence str = strs[i];
if (isNotEmpty(str)) {
return str;
}
}
return "null";
}
/**
* @Method : split
* @author : 陈曦
* @date : 2011-12-3 下午10:50:55
* @Description : 将字符串按照给定的分隔字符转换为数组，分隔符可以是*哦！
*/
public static String[] split(String pattern, String wildcard) {
if ("*".equals(wildcard))
wildcard = "\\u002A";
return pattern.split(wildcard);
}
/**
* @Method : upperFirst
* @author : 陈曦
* @date : 2011-12-8 下午02:09:01
* @Description : 字符串首字母转换成大写
* @param str 需要转换的字符串
* @return 转换结果
*/
public static String upperFirst(String str) {
return changeFirstCharacterCase(str, true);
}
/**
* @Method : lowerFirst
* @author : 陈曦
* @date : 2011-12-8 下午02:36:47
* @Description : 将字符串首字母小写
* @param str 字符串
* @return 首字母小写后的新字符串
*/
public static String lowerFirst(String str) {
return changeFirstCharacterCase(str, false);
}
/**
* @Method : changeFirstCharacterCase
* @author : 陈曦
* @date : 2011-12-8 下午02:06:59
* @Description : 转换字符串首字母的大小写
* @param str 需要转换的字符串
* @param capitalize true为转换成大写，false为传换成小写
* @return 转换完成的新的字符串
*/
private static String changeFirstCharacterCase(String str, boolean capitalize) {
if (isEmpty(str)) {
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();
}
/**
* @Method : trimWhitespace
* @author : 陈曦
* @date : 2011-12-8 下午02:13:36
* @Description : 去除字符串前后的不可见字符
* @param str 需要处理的字符串
* @return 处理结果
*/
public static String trimWhitespace(String str) {
if (isEmpty(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();
}
/**
* @Method : trimAllWhitespace
* @author : 陈曦
* @date : 2011-12-3 下午10:47:38
* @Description : 去掉字符串所有空白字符
*/
public static String trimAllWhitespace(String str) {
if (isEmpty(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();
}
/**
* @Method : trimArrayElements
* @author : 陈曦
* @date : 2011-12-3 下午10:48:45
* @Description : 去掉数组中所有元素两端的空格,使用的是J2SE的trim方法
* @return 返回的数组是一个新的引用！！！而非传入的引用
*/
public static String[] trimArrayElements(String[] array) {
if (ObjectUtils.isEmptyArray(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;
}
/**
* @Method : containsWhitespace
* @author : 陈曦
* @date : 2011-12-8 下午02:14:31
* @param str 需要检查的字符串
* @Description : 是否包含不可见字符,不可见字符包括换行符啊！
* <pre>
* containsWhitespace("aaaaa") = false
* containsWhitespace("aaa aa") = true
* containsWhitespace("aaa\naa") = true
* </pre>
*/
public static boolean containsWhitespace(CharSequence str) {
if (isEmpty(str)) {
return false;
}
int strLen = str.length();
for (int i = 0; i < strLen; i++) {
if (Character.isWhitespace(str.charAt(i))) {
return true;
}
}
return false;
}
/**
* Convert a CSV list into an array of Strings.
*
* @param str the input String
* @return an array of Strings, or the empty array in case of empty input
*/
public static String[] commaDelimitedListToStringArray(String str) {
return delimitedListToStringArray(str, ",");
}
/**
* Convenience method to convert a CSV string list to a set. Note that this
* will suppress duplicates.
*
* @param str
* the input String
* @return a Set of String entries in the list
*/
public static Set<String> commaDelimitedListToSet(String str) {
Set<String> set = new TreeSet<String>();
String[] tokens = commaDelimitedListToStringArray(str);
for (String token : tokens) {
set.add(token);
}
return set;
}
/**
* 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 #tokenizeToStringArray
*/
public static String[] delimitedListToStringArray(String str, String delimiter) {
return delimitedListToStringArray(str, delimiter, null);
}
/**
* 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 #tokenizeToStringArray
*/
public static String[] delimitedListToStringArray(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);
}
/**
* 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
*/
public static String deleteAny(String inString, String charsToDelete) {
if (!isNotEmpty(inString) || !isNotEmpty(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();
}
/**
* 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()]);
}
/**
* 将字符串按半角逗号，拆分成数组，空元素将被忽略
*
* @param s
* 字符串
* @return 字符串数组
*/
public static String[] splitIgnoreBlank(String s) {
return splitIgnoreBlank(s, ",");
}
/**
* @Method : splitIgnoreBlank
* @author : 陈曦
* @date : 2011-12-8 下午02:18:57
* @Description : 根据一个正则式，将字符串拆分成数组，空元素将被忽略
* @param s 字符串
* @param regex 正则式
* @return 字符串数组
*/
public static String[] splitIgnoreBlank(String s, String regex) {
if (null == s)
return null;
String[] ss = s.split(regex);
List<String> list = new LinkedList<String>();
for (String st : ss) {
if (isBlank(st))
continue;
list.add(trimWhitespace(st));
}
return list.toArray(new String[list.size()]);
}
/**
* 复制字符串
*
* @param cs 字符串
* @param num 数量
* @return 新字符串
*/
public static String dup(CharSequence cs, int num) {
if (isBlank(cs) || num <= 0)
return "";
StringBuilder sb = new StringBuilder(cs.length() * num);
for (int i = 0; i < num; i++)
sb.append(cs);
return sb.toString();
}
/**
* 复制字符
*
* @param c 字符
* @param num 数量
* @return 新字符串
*/
public static String dup(char c, int num) {
if (c == 0 || num < 1)
return "";
StringBuilder sb = new StringBuilder(num);
for (int i = 0; i < num; i++)
sb.append(c);
return sb.toString();
}
/**
* 将一个数组转换成字符串
* <p>
* 所有的元素都被格式化字符串包裹。 这个格式话字符串只能有一个占位符， %s, %d 等，均可，请视你的数组内容而定
*
* @param fmt 格式
* @param objs 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concatBy(String fmt, T[] objs) {
StringBuilder sb = new StringBuilder();
for (T obj : objs)
sb.append(String.format(fmt, obj));
return sb;
}
/**
* 将一个数组转换成字符串
* <p>
* 所有的元素都被格式化字符串包裹。 这个格式话字符串只能有一个占位符， %s, %d 等，均可，请视你的数组内容而定
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param ptn 格式
* @param c 分隔符
* @param objs 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concatBy(String ptn, Object c, T[] objs) {
StringBuilder sb = new StringBuilder();
for (T obj : objs)
sb.append(String.format(ptn, obj)).append(c);
if (sb.length() > 0)
sb.deleteCharAt(sb.length() - 1);
return sb;
}
/**
* 将一个数组转换成字符串
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param c 分隔符
* @param objs 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concat(Object c, T[] objs) {
StringBuilder sb = new StringBuilder();
if (null == objs || 0 == objs.length)
return sb;
sb.append(objs[0]);
for (int i = 1; i < objs.length; i++)
sb.append(c).append(objs[i]);
return sb;
}
/**
* 将一个长整型数组转换成字符串
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param c 分隔符
* @param vals 数组
* @return 拼合后的字符串
*/
public static StringBuilder concat(Object c, long[] vals) {
StringBuilder sb = new StringBuilder();
if (null == vals || 0 == vals.length)
return sb;
sb.append(vals[0]);
for (int i = 1; i < vals.length; i++)
sb.append(c).append(vals[i]);
return sb;
}
/**
* 将一个整型数组转换成字符串
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param c 分隔符
* @param vals 数组
* @return 拼合后的字符串
*/
public static StringBuilder concat(Object c, int[] vals) {
StringBuilder sb = new StringBuilder();
if (null == vals || 0 == vals.length)
return sb;
sb.append(vals[0]);
for (int i = 1; i < vals.length; i++)
sb.append(c).append(vals[i]);
return sb;
}
/**
* 将一个数组的部分元素转换成字符串
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param offset 开始元素的下标
* @param len 元素数量
* @param c 分隔符
* @param objs 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concat(int offset, int len, Object c, T[] objs) {
StringBuilder sb = new StringBuilder();
if (null == objs || len < 0 || 0 == objs.length)
return sb;
if (offset < objs.length) {
sb.append(objs[offset]);
for (int i = 1; i < len && i + offset < objs.length; i++) {
sb.append(c).append(objs[i + offset]);
}
}
return sb;
}
/**
* 将一个数组所有元素拼合成一个字符串
*
* @param objs 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concat(T[] objs) {
StringBuilder sb = new StringBuilder();
for (T e : objs)
sb.append(e.toString());
return sb;
}
/**
* 将一个数组部分元素拼合成一个字符串
*
* @param offset 开始元素的下标
* @param len 元素数量
* @param array 数组
* @return 拼合后的字符串
*/
public static <T> StringBuilder concat(int offset, int len, T[] array) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
sb.append(array[i + offset].toString());
}
return sb;
}
/**
* 将一个集合转换成字符串
* <p>
* 每个元素之间，都会用一个给定的字符分隔
*
* @param c 分隔符
* @param coll 集合
* @return 拼合后的字符串
*/
public static <T> StringBuilder concat(Object c, Collection<T> coll) {
StringBuilder sb = new StringBuilder();
if (null == coll || coll.isEmpty())
return sb;
Iterator<T> it = coll.iterator();
sb.append(it.next());
while (it.hasNext())
sb.append(c).append(it.next());
return sb;
}
/**
* Normalize the path by suppressing sequences like "path/.." and inner
* simple dots.
* <p>
* The result is convenient for path comparison. For other uses, notice that
* Windows separators ("\") are replaced by simple slashes.
*
* @param path
* the original path
* @return the normalized path
*/
public static String cleanPath(String path) {
if (path == null) {
return null;
}
String pathToUse = replace(path, WINDOWS_FOLDER_SEPARATOR, FOLDER_SEPARATOR);
// Strip prefix from path to analyze, to not treat it as part of the
// first path element. This is necessary to correctly parse paths like
// "file:core/../core/io/Resource.class", where the ".." should just
// strip the first "core" directory while keeping the "file:" prefix.
int prefixIndex = pathToUse.indexOf(":");
String prefix = "";
if (prefixIndex != -1) {
prefix = pathToUse.substring(0, prefixIndex + 1);
pathToUse = pathToUse.substring(prefixIndex + 1);
}
if (pathToUse.startsWith(FOLDER_SEPARATOR)) {
prefix = prefix + FOLDER_SEPARATOR;
pathToUse = pathToUse.substring(1);
}
String[] pathArray = delimitedListToStringArray(pathToUse, FOLDER_SEPARATOR);
List<String> pathElements = new LinkedList<String>();
int tops = 0;
for (int i = pathArray.length - 1; i >= 0; i--) {
String element = pathArray[i];
if (CURRENT_PATH.equals(element)) {
// Points to current directory - drop it.
} else if (TOP_PATH.equals(element)) {
// Registering top path found.
tops++;
} else {
if (tops > 0) {
// Merging path element with element corresponding to top
// path.
tops--;
} else {
// Normal path element found.
pathElements.add(0, element);
}
}
}
// Remaining top paths need to be retained.
for (int i = 0; i < tops; i++) {
pathElements.add(0, TOP_PATH);
}
return prefix + collectionToDelimitedString(pathElements, FOLDER_SEPARATOR);
}
/**
* 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 (!isNotEmpty(inString) || !isNotEmpty(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();
}
/**
* 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 collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix) {
if (CollectionUtils.isEmpty(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 collectionToDelimitedString(Collection<?> coll, String delim) {
return collectionToDelimitedString(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 collectionToCommaDelimitedString(Collection<?> coll) {
return collectionToDelimitedString(coll, ",");
}
public static String arrayToDelimitedString(Object[] arr, String delim) {
if (ObjectUtils.isEmptyArray(arr)) {
return "";
}
if (arr.length == 1) {
return ObjectUtils.nullSafeToString(arr[0]);
}
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();
}
public static String arrayToCommaDelimitedString(Object[] arr) {
return arrayToDelimitedString(arr, ",");
}
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;
}
public static String applyRelativePath(String path, String relativePath) {
int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
if (separatorIndex != -1) {
String newPath = path.substring(0, separatorIndex);
if (!relativePath.startsWith(FOLDER_SEPARATOR)) {
newPath += FOLDER_SEPARATOR;
}
return newPath + relativePath;
}
else {
return relativePath;
}
}
/**
* Extract the filename from the given path,
* e.g. "mypath/myfile.txt" -> "myfile.txt".
* @param path the file path (may be <code>null</code>)
* @return the extracted filename, or <code>null</code> if none
*/
public static String getFilename(String path) {
if (path == null) {
return null;
}
int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path);
}
/**
* Extract the filename extension from the given path,
* e.g. "mypath/myfile.txt" -> "txt".
* @param path the file path (may be <code>null</code>)
* @return the extracted filename extension, or <code>null</code> if none
*/
public static String getFilenameExtension(String path) {
if (path == null) {
return null;
}
int sepIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
return (sepIndex != -1 ? path.substring(sepIndex + 1) : null);
}
/**
* Tokenize the given String into a String array via a StringTokenizer.
* Trims tokens and omits empty tokens.
* <p>The given delimiters string is supposed to consist of any number of
* delimiter characters. Each of those characters can be used to separate
* tokens. A delimiter is always a single character; for multi-character
* delimiters, consider using <code>delimitedListToStringArray</code>
* @param str the String to tokenize
* @param delimiters the delimiter characters, assembled as String
* (each of those characters is individually considered as delimiter).
* @return an array of the tokens
* @see java.util.StringTokenizer
* @see java.lang.String#trim()
* @see #delimitedListToStringArray
*/
public static String[] tokenizeToStringArray(String str, String delimiters) {
return tokenizeToStringArray(str, delimiters, true, true);
}
/**
* Tokenize the given String into a String array via a StringTokenizer.
* <p>The given delimiters string is supposed to consist of any number of
* delimiter characters. Each of those characters can be used to separate
* tokens. A delimiter is always a single character; for multi-character
* delimiters, consider using <code>delimitedListToStringArray</code>
* @param str the String to tokenize
* @param delimiters the delimiter characters, assembled as String
* (each of those characters is individually considered as delimiter)
* @param trimTokens trim the tokens via String's <code>trim</code>
* @param ignoreEmptyTokens omit empty tokens from the result array
* (only applies to tokens that are empty after trimming; StringTokenizer
* will not consider subsequent delimiters as token in the first place).
* @return an array of the tokens (<code>null</code> if the input String
* was <code>null</code>)
* @see java.util.StringTokenizer
* @see java.lang.String#trim()
* @see #delimitedListToStringArray
*/
public static String[] tokenizeToStringArray(
String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) {
if (str == null) {
return null;
}
StringTokenizer st = new StringTokenizer(str, delimiters);
List<String> tokens = new ArrayList<String>();
while (st.hasMoreTokens()) {
String token = st.nextToken();
if (trimTokens) {
token = token.trim();
}
if (!ignoreEmptyTokens || token.length() > 0) {
tokens.add(token);
}
}
return toStringArray(tokens);
}
/**
* 计算sub在字符串s中出现的次数
* @param str 需要搜索 的字串. 如果为null则返回0
* @param sub 需要统计的字符串. 如果为null则返回0
*/
public static int countOccurrencesOf(String str, String sub) {
if (isEmpty(str)||isEmpty(sub)) {
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 Locale parseLocaleString(String localeString) {
String[] parts = tokenizeToStringArray(localeString, "_ ", false, false);
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);
}
public static String trimLeadingWhitespace(String str) {
if (isBlank(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
sb.deleteCharAt(0);
}
return sb.toString();
}
public static String trimLeadingCharacter(String str, char leadingCharacter) {
if (isBlank(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) {
sb.deleteCharAt(0);
}
return sb.toString();
}
public static String trimCharacter(String str, char character) {
if (isBlank(str)) {
return str;
}
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && sb.charAt(0) == character) {
sb.deleteCharAt(0);
}
while (sb.length() > 0 && sb.charAt(sb.length() - 1) == character) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
/**
* 将字符串首字母大写
*
* @param s
* 字符串
* @return 首字母大写后的新字符串
*/
public static String capitalize(CharSequence s) {
if (null == s)
return null;
int len = s.length();
if (len == 0)
return "";
char char0 = s.charAt(0);
if (Character.isUpperCase(char0))
return s.toString();
return new StringBuilder(len).append(Character.toUpperCase(char0))
.append(s.subSequence(1, len))
.toString();
}
}