一、前言

關于字符串工具類StringUtils實現字符串是否包含isChinese中文、是否包含isMessyCode亂碼、常規數據類型轉換、替換/刪除/判空、兩字符串數組mergeStringArrays合并、刪除trimArrayElements字符串數組指定數組元素、字符串去重removeDuplicateStrings處理、字符串集合轉換等相關處理。

二、代碼示例import?com.alibaba.fastjson.JSONObject;@b@@b@import?org.apache.commons.lang.WordUtils;@b@import?org.springframework.util.CollectionUtils;@b@import?org.springframework.util.ObjectUtils;@b@@b@import?java.nio.charset.Charset;@b@import?java.text.DateFormat;@b@import?java.text.SimpleDateFormat;@b@import?java.util.ArrayList;@b@import?java.util.Arrays;@b@import?java.util.Collection;@b@import?java.util.Collections;@b@import?java.util.Date;@b@import?java.util.Enumeration;@b@import?java.util.Iterator;@b@import?java.util.LinkedList;@b@import?java.util.List;@b@import?java.util.Locale;@b@import?java.util.Properties;@b@import?java.util.Random;@b@import?java.util.Set;@b@import?java.util.StringTokenizer;@b@import?java.util.TimeZone;@b@import?java.util.TreeSet;@b@import?java.util.regex.Matcher;@b@import?java.util.regex.Pattern;@b@@b@public?class?StringUtils?{@b@@b@public?static?final?Charset?DEFAULT_CHARSET?=?Charset.forName("UTF-8");@b@@b@private?static?DateFormat?date_format?=?new?SimpleDateFormat("yyyy/M/d",?Locale.ENGLISH);@b@private?static?DateFormat?time_format?=?new?SimpleDateFormat("yyyy/M/d?hh:mm:ss",?Locale.ENGLISH);@b@@b@private?static?final?String?FOLDER_SEPARATOR?=?"/";@b@@b@private?static?final?String?WINDOWS_FOLDER_SEPARATOR?=?"\\";@b@@b@private?static?final?String?TOP_PATH?=?"..";@b@@b@private?static?final?String?CURRENT_PATH?=?".";@b@@b@private?static?final?char?EXTENSION_SEPARATOR?=?'.';@b@@b@public?static?String?defFormatDate(Date?date)?{@b@return?date_format.format(date);@b@}@b@@b@public?static?String?defFormatTime(Date?date)?{@b@return?time_format.format(date);@b@}@b@@b@public?static?String?firstUpcase(String?text)?{@b@if?(text?!=?null?&&?text.length()?>?0)?{@b@if?(text.length()?==?1)?{@b@return?text.toUpperCase();@b@}@b@return?text.substring(0,?1).toUpperCase()?+?text.substring(1);?@b@}@b@return?text;@b@}@b@@b@public?static?String?firstLowercase(String?text)?{@b@if?(text?!=?null?&&?text.length()?>?0)?{@b@if?(text.length()?==?1)?{@b@return?text.toLowerCase();@b@}@b@return?text.substring(0,?1).toLowerCase()?+?text.substring(1);@b@}@b@return?text;@b@}@b@@b@public?static?String?getter(String?field)?{@b@return?"get"?+?firstUpcase(field);@b@}@b@@b@public?static?String?setter(String?field)?{@b@return?"set"?+?firstUpcase(field);@b@}@b@@b@public?static?String?indent(int?idx)?{@b@StringBuffer?result?=?new?StringBuffer(idx*4?+?1);@b@for?(int?i?=?0;?i??0.4)?{??@b@????????????return?true;??@b@????????}?else?{??@b@????????????return?false;??@b@????????}??@b@????}??@b@@b@//---------------------------------------------------------------------@b@//?General?convenience?methods?for?working?with?Strings@b@//---------------------------------------------------------------------@b@@b@/**@b@?*?Check?whether?the?given?String?is?empty.@b@?*?

This?method?accepts?any?Object?as?an?argument,?comparing?it?to@b@?*?{@code?null}?and?the?empty?String.?As?a?consequence,?this?method@b@?*?will?never?return?{@code?true}?for?a?non-null?non-String?object.@b@?*?

The?Object?signature?is?useful?for?general?attribute?handling?code@b@?*?that?commonly?deals?with?Strings?but?generally?has?to?iterate?over@b@?*?Objects?since?attributes?may?e.g.?be?primitive?value?objects?as?well.@b@?*?@param?str?the?candidate?String@b@?*?@since?3.2.1@b@?*/@b@public?static?boolean?isEmpty(Object?str)?{@b@return?(str?==?null?||?"".equals(str));@b@}@b@@b@public?static?boolean?hasEmpty(Object...strs)?{@b@for?(Object?str?:?strs)?{@b@if?(str?==?null?||?"".equals(str))?{@b@return?true;@b@}@b@}@b@return?false;@b@}@b@@b@/**@b@?*?Check?that?the?given?CharSequence?is?neither?{@code?null}?nor?of?length?0.@b@?*?Note:?Will?return?{@code?true}?for?a?CharSequence?that?purely?consists?of?whitespace.@b@?*?

@b@?*?StringUtils.hasLength(null)?=?false@b@?*?StringUtils.hasLength("")?=?false@b@?*?StringUtils.hasLength("?")?=?true@b@?*?StringUtils.hasLength("Hello")?=?true@b@?*?@b@?*?@param?str?the?CharSequence?to?check?(may?be?{@code?null})@b@?*?@return?{@code?true}?if?the?CharSequence?is?not?null?and?has?length@b@?*?@see?#hasText(String)@b@?*/@b@public?static?boolean?hasLength(CharSequence?str)?{@b@return?(str?!=?null?&&?str.length()?>?0);@b@}@b@@b@/**@b@?*?Check?that?the?given?String?is?neither?{@code?null}?nor?of?length?0.@b@?*?Note:?Will?return?{@code?true}?for?a?String?that?purely?consists?of?whitespace.@b@?*?@param?str?the?String?to?check?(may?be?{@code?null})@b@?*?@return?{@code?true}?if?the?String?is?not?null?and?has?length@b@?*?@see?#hasLength(CharSequence)@b@?*/@b@public?static?boolean?hasLength(String?str)?{@b@return?hasLength((CharSequence)?str);@b@}@b@@b@/**@b@?*?Check?whether?the?given?CharSequence?has?actual?text.@b@?*?More?specifically,?returns?{@code?true}?if?the?string?not?{@code?null},@b@?*?its?length?is?greater?than?0,?and?it?contains?at?least?one?non-whitespace?character.@b@?*?@b@?*?StringUtils.hasText(null)?=?false@b@?*?StringUtils.hasText("")?=?false@b@?*?StringUtils.hasText("?")?=?false@b@?*?StringUtils.hasText("12345")?=?true@b@?*?StringUtils.hasText("?12345?")?=?true@b@?*?@b@?*?@param?str?the?CharSequence?to?check?(may?be?{@code?null})@b@?*?@return?{@code?true}?if?the?CharSequence?is?not?{@code?null},@b@?*?its?length?is?greater?than?0,?and?it?does?not?contain?whitespace?only@b@?*?@see?Character#isWhitespace@b@?*/@b@public?static?boolean?hasText(CharSequence?str)?{@b@if?(!hasLength(str))?{@b@return?false;@b@}@b@int?strLen?=?str.length();@b@for?(int?i?=?0;?i??0?&&?Character.isWhitespace(sb.charAt(0)))?{@b@sb.deleteCharAt(0);@b@}@b@while?(sb.length()?>?0?&&?Character.isWhitespace(sb.charAt(sb.length()?-?1)))?{@b@sb.deleteCharAt(sb.length()?-?1);@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Trim?all?whitespace?from?the?given?String:@b@?*?leading,?trailing,?and?in?between?characters.@b@?*?@param?str?the?String?to?check@b@?*?@return?the?trimmed?String@b@?*?@see?java.lang.Character#isWhitespace@b@?*/@b@public?static?String?trimAllWhitespace(String?str)?{@b@if?(!hasLength(str))?{@b@return?str;@b@}@b@StringBuilder?sb?=?new?StringBuilder(str);@b@int?index?=?0;@b@while?(sb.length()?>?index)?{@b@if?(Character.isWhitespace(sb.charAt(index)))?{@b@sb.deleteCharAt(index);@b@}@b@else?{@b@index++;@b@}@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Trim?leading?whitespace?from?the?given?String.@b@?*?@param?str?the?String?to?check@b@?*?@return?the?trimmed?String@b@?*?@see?java.lang.Character#isWhitespace@b@?*/@b@public?static?String?trimLeadingWhitespace(String?str)?{@b@if?(!hasLength(str))?{@b@return?str;@b@}@b@StringBuilder?sb?=?new?StringBuilder(str);@b@while?(sb.length()?>?0?&&?Character.isWhitespace(sb.charAt(0)))?{@b@sb.deleteCharAt(0);@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Trim?trailing?whitespace?from?the?given?String.@b@?*?@param?str?the?String?to?check@b@?*?@return?the?trimmed?String@b@?*?@see?java.lang.Character#isWhitespace@b@?*/@b@public?static?String?trimTrailingWhitespace(String?str)?{@b@if?(!hasLength(str))?{@b@return?str;@b@}@b@StringBuilder?sb?=?new?StringBuilder(str);@b@while?(sb.length()?>?0?&&?Character.isWhitespace(sb.charAt(sb.length()?-?1)))?{@b@sb.deleteCharAt(sb.length()?-?1);@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Trim?all?occurrences?of?the?supplied?leading?character?from?the?given?String.@b@?*?@param?str?the?String?to?check@b@?*?@param?leadingCharacter?the?leading?character?to?be?trimmed@b@?*?@return?the?trimmed?String@b@?*/@b@public?static?String?trimLeadingCharacter(String?str,?char?leadingCharacter)?{@b@if?(!hasLength(str))?{@b@return?str;@b@}@b@StringBuilder?sb?=?new?StringBuilder(str);@b@while?(sb.length()?>?0?&&?sb.charAt(0)?==?leadingCharacter)?{@b@sb.deleteCharAt(0);@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Trim?all?occurrences?of?the?supplied?trailing?character?from?the?given?String.@b@?*?@param?str?the?String?to?check@b@?*?@param?trailingCharacter?the?trailing?character?to?be?trimmed@b@?*?@return?the?trimmed?String@b@?*/@b@public?static?String?trimTrailingCharacter(String?str,?char?trailingCharacter)?{@b@if?(!hasLength(str))?{@b@return?str;@b@}@b@StringBuilder?sb?=?new?StringBuilder(str);@b@while?(sb.length()?>?0?&&?sb.charAt(sb.length()?-?1)?==?trailingCharacter)?{@b@sb.deleteCharAt(sb.length()?-?1);@b@}@b@return?sb.toString();@b@}@b@@b@@b@/**@b@?*?Test?if?the?given?String?starts?with?the?specified?prefix,@b@?*?ignoring?upper/lower?case.@b@?*?@param?str?the?String?to?check@b@?*?@param?prefix?the?prefix?to?look?for@b@?*?@see?java.lang.String#startsWith@b@?*/@b@public?static?boolean?startsWithIgnoreCase(String?str,?String?prefix)?{@b@if?(str?==?null?||?prefix?==?null)?{@b@return?false;@b@}@b@if?(str.startsWith(prefix))?{@b@return?true;@b@}@b@if?(str.length()?=?str.length()?||?str.charAt(i)?!=?substring.charAt(j))?{@b@return?false;@b@}@b@}@b@return?true;@b@}@b@@b@/**@b@?*?Count?the?occurrences?of?the?substring?in?string?s.@b@?*?@param?str?string?to?search?in.?Return?0?if?this?is?null.@b@?*?@param?sub?string?to?search?for.?Return?0?if?this?is?null.@b@?*/@b@public?static?int?countOccurrencesOf(String?str,?String?sub)?{@b@if?(str?==?null?||?sub?==?null?||?str.length()?==?0?||?sub.length()?==?0)?{@b@return?0;@b@}@b@int?count?=?0;@b@int?pos?=?0;@b@int?idx;@b@while?((idx?=?str.indexOf(sub,?pos))?!=?-1)?{@b@++count;@b@pos?=?idx?+?sub.length();@b@}@b@return?count;@b@}@b@@b@/**@b@?*?Replace?all?occurrences?of?a?substring?within?a?string?with@b@?*?another?string.@b@?*?@param?inString?String?to?examine@b@?*?@param?oldPattern?String?to?replace@b@?*?@param?newPattern?String?to?insert@b@?*?@return?a?String?with?the?replacements@b@?*/@b@public?static?String?replace(String?inString,?String?oldPattern,?String?newPattern)?{@b@if?(!hasLength(inString)?||?!hasLength(oldPattern)?||?newPattern?==?null)?{@b@return?inString;@b@}@b@StringBuilder?sb?=?new?StringBuilder();@b@int?pos?=?0;?//?our?position?in?the?old?string@b@int?index?=?inString.indexOf(oldPattern);@b@//?the?index?of?an?occurrence?we've?found,?or?-1@b@int?patLen?=?oldPattern.length();@b@while?(index?>=?0)?{@b@sb.append(inString.substring(pos,?index));@b@sb.append(newPattern);@b@pos?=?index?+?patLen;@b@index?=?inString.indexOf(oldPattern,?pos);@b@}@b@sb.append(inString.substring(pos));@b@//?remember?to?append?any?characters?to?the?right?of?a?match@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Delete?all?occurrences?of?the?given?substring.@b@?*?@param?inString?the?original?String@b@?*?@param?pattern?the?pattern?to?delete?all?occurrences?of@b@?*?@return?the?resulting?String@b@?*/@b@public?static?String?delete(String?inString,?String?pattern)?{@b@return?replace(inString,?pattern,?"");@b@}@b@@b@/**@b@?*?Delete?any?character?in?a?given?String.@b@?*?@param?inString?the?original?String@b@?*?@param?charsToDelete?a?set?of?characters?to?delete.@b@?*?E.g.?"az\n"?will?delete?'a's,?'z's?and?new?lines.@b@?*?@return?the?resulting?String@b@?*/@b@public?static?String?deleteAny(String?inString,?String?charsToDelete)?{@b@if?(!hasLength(inString)?||?!hasLength(charsToDelete))?{@b@return?inString;@b@}@b@StringBuilder?sb?=?new?StringBuilder();@b@for?(int?i?=?0;?i??"myfile.txt".@b@?*?@param?path?the?file?path?(may?be?{@code?null})@b@?*?@return?the?extracted?filename,?or?{@code?null}?if?none@b@?*/@b@public?static?String?getFilename(String?path)?{@b@if?(path?==?null)?{@b@return?null;@b@}@b@int?separatorIndex?=?path.lastIndexOf(FOLDER_SEPARATOR);@b@return?(separatorIndex?!=?-1???path.substring(separatorIndex?+?1)?:?path);@b@}@b@@b@/**@b@?*?Extract?the?filename?extension?from?the?given?path,@b@?*?e.g.?"mypath/myfile.txt"?->?"txt".@b@?*?@param?path?the?file?path?(may?be?{@code?null})@b@?*?@return?the?extracted?filename?extension,?or?{@code?null}?if?none@b@?*/@b@public?static?String?getFilenameExtension(String?path)?{@b@if?(path?==?null)?{@b@return?null;@b@}@b@int?extIndex?=?path.lastIndexOf(EXTENSION_SEPARATOR);@b@if?(extIndex?==?-1)?{@b@return?null;@b@}@b@int?folderIndex?=?path.lastIndexOf(FOLDER_SEPARATOR);@b@if?(folderIndex?>?extIndex)?{@b@return?null;@b@}@b@return?path.substring(extIndex?+?1);@b@}@b@@b@/**@b@?*?Strip?the?filename?extension?from?the?given?path,@b@?*?e.g.?"mypath/myfile.txt"?->?"mypath/myfile".@b@?*?@param?path?the?file?path?(may?be?{@code?null})@b@?*?@return?the?path?with?stripped?filename?extension,@b@?*?or?{@code?null}?if?none@b@?*/@b@public?static?String?stripFilenameExtension(String?path)?{@b@if?(path?==?null)?{@b@return?null;@b@}@b@int?extIndex?=?path.lastIndexOf(EXTENSION_SEPARATOR);@b@if?(extIndex?==?-1)?{@b@return?path;@b@}@b@int?folderIndex?=?path.lastIndexOf(FOLDER_SEPARATOR);@b@if?(folderIndex?>?extIndex)?{@b@return?path;@b@}@b@return?path.substring(0,?extIndex);@b@}@b@@b@/**@b@?*?Apply?the?given?relative?path?to?the?given?path,@b@?*?assuming?standard?Java?folder?separation?(i.e.?"/"?separators).@b@?*?@param?path?the?path?to?start?from?(usually?a?full?file?path)@b@?*?@param?relativePath?the?relative?path?to?apply@b@?*?(relative?to?the?full?file?path?above)@b@?*?@return?the?full?file?path?that?results?from?applying?the?relative?path@b@?*/@b@public?static?String?applyRelativePath(String?path,?String?relativePath)?{@b@int?separatorIndex?=?path.lastIndexOf(FOLDER_SEPARATOR);@b@if?(separatorIndex?!=?-1)?{@b@String?newPath?=?path.substring(0,?separatorIndex);@b@if?(!relativePath.startsWith(FOLDER_SEPARATOR))?{@b@newPath?+=?FOLDER_SEPARATOR;@b@}@b@return?newPath?+?relativePath;@b@}@b@else?{@b@return?relativePath;@b@}@b@}@b@@b@/**@b@?*?Normalize?the?path?by?suppressing?sequences?like?"path/.."?and@b@?*?inner?simple?dots.@b@?*?

The?result?is?convenient?for?path?comparison.?For?other?uses,@b@?*?notice?that?Windows?separators?("\")?are?replaced?by?simple?slashes.@b@?*?@param?path?the?original?path@b@?*?@return?the?normalized?path@b@?*/@b@public?static?String?cleanPath(String?path)?{@b@if?(path?==?null)?{@b@return?null;@b@}@b@String?pathToUse?=?replace(path,?WINDOWS_FOLDER_SEPARATOR,?FOLDER_SEPARATOR);@b@@b@//?Strip?prefix?from?path?to?analyze,?to?not?treat?it?as?part?of?the@b@//?first?path?element.?This?is?necessary?to?correctly?parse?paths?like@b@//?"file:core/../core/io/Resource.class",?where?the?".."?should?just@b@//?strip?the?first?"core"?directory?while?keeping?the?"file:"?prefix.@b@int?prefixIndex?=?pathToUse.indexOf(":");@b@String?prefix?=?"";@b@if?(prefixIndex?!=?-1)?{@b@prefix?=?pathToUse.substring(0,?prefixIndex?+?1);@b@pathToUse?=?pathToUse.substring(prefixIndex?+?1);@b@}@b@if?(pathToUse.startsWith(FOLDER_SEPARATOR))?{@b@prefix?=?prefix?+?FOLDER_SEPARATOR;@b@pathToUse?=?pathToUse.substring(1);@b@}@b@@b@String[]?pathArray?=?delimitedListToStringArray(pathToUse,?FOLDER_SEPARATOR);@b@List?pathElements?=?new?LinkedList();@b@int?tops?=?0;@b@@b@for?(int?i?=?pathArray.length?-?1;?i?>=?0;?i--)?{@b@String?element?=?pathArray[i];@b@if?(CURRENT_PATH.equals(element))?{@b@//?Points?to?current?directory?-?drop?it.@b@}@b@else?if?(TOP_PATH.equals(element))?{@b@//?Registering?top?path?found.@b@tops++;@b@}@b@else?{@b@if?(tops?>?0)?{@b@//?Merging?path?element?with?element?corresponding?to?top?path.@b@tops--;@b@}@b@else?{@b@//?Normal?path?element?found.@b@pathElements.add(0,?element);@b@}@b@}@b@}@b@@b@//?Remaining?top?paths?need?to?be?retained.@b@for?(int?i?=?0;?i?This?is?the?inverse?operation?of?{@link?Locale#toString?Locale's?toString}.@b@?*?@param?localeString?the?locale?String,?following?{@code?Locale's}@b@?*?{@code?toString()}?format?("en",?"en_UK",?etc);@b@?*?also?accepts?spaces?as?separators,?as?an?alternative?to?underscores@b@?*?@return?a?corresponding?{@code?Locale}?instance@b@?*?@throws?IllegalArgumentException?in?case?of?an?invalid?locale?specification@b@?*/@b@public?static?Locale?parseLocaleString(String?localeString)?{@b@String[]?parts?=?tokenizeToStringArray(localeString,?"_?",?false,?false);@b@String?language?=?(parts.length?>?0???parts[0]?:?"");@b@String?country?=?(parts.length?>?1???parts[1]?:?"");@b@validateLocalePart(language);@b@validateLocalePart(country);@b@String?variant?=?"";@b@if?(parts.length?>?2)?{@b@//?There?is?definitely?a?variant,?and?it?is?everything?after?the?country@b@//?code?sans?the?separator?between?the?country?code?and?the?variant.@b@int?endIndexOfCountryCode?=?localeString.lastIndexOf(country)?+?country.length();@b@//?Strip?off?any?leading?'_'?and?whitespace,?what's?left?is?the?variant.@b@variant?=?trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode));@b@if?(variant.startsWith("_"))?{@b@variant?=?trimLeadingCharacter(variant,?'_');@b@}@b@}@b@return?(language.length()?>?0???new?Locale(language,?country,?variant)?:?null);@b@}@b@@b@private?static?void?validateLocalePart(String?localePart)?{@b@for?(int?i?=?0;?i?The?order?of?elements?in?the?original?arrays?is?preserved.@b@?*?@param?array1?the?first?array?(can?be?{@code?null})@b@?*?@param?array2?the?second?array?(can?be?{@code?null})@b@?*?@return?the?new?array?({@code?null}?if?both?given?arrays?were?{@code?null})@b@?*/@b@public?static?String[]?concatenateStringArrays(String[]?array1,?String[]?array2)?{@b@if?(ObjectUtils.isEmpty(array1))?{@b@return?array2;@b@}@b@if?(ObjectUtils.isEmpty(array2))?{@b@return?array1;@b@}@b@String[]?newArr?=?new?String[array1.length?+?array2.length];@b@System.arraycopy(array1,?0,?newArr,?0,?array1.length);@b@System.arraycopy(array2,?0,?newArr,?array1.length,?array2.length);@b@return?newArr;@b@}@b@@b@/**@b@?*?Merge?the?given?String?arrays?into?one,?with?overlapping@b@?*?array?elements?only?included?once.@b@?*?

The?order?of?elements?in?the?original?arrays?is?preserved@b@?*?(with?the?exception?of?overlapping?elements,?which?are?only@b@?*?included?on?their?first?occurrence).@b@?*?@param?array1?the?first?array?(can?be?{@code?null})@b@?*?@param?array2?the?second?array?(can?be?{@code?null})@b@?*?@return?the?new?array?({@code?null}?if?both?given?arrays?were?{@code?null})@b@?*/@b@public?static?String[]?mergeStringArrays(String[]?array1,?String[]?array2)?{@b@if?(ObjectUtils.isEmpty(array1))?{@b@return?array2;@b@}@b@if?(ObjectUtils.isEmpty(array2))?{@b@return?array1;@b@}@b@List?result?=?new?ArrayList();@b@result.addAll(Arrays.asList(array1));@b@for?(String?str?:?array2)?{@b@if?(!result.contains(str))?{@b@result.add(str);@b@}@b@}@b@return?toStringArray(result);@b@}@b@@b@/**@b@?*?Turn?given?source?String?array?into?sorted?array.@b@?*?@param?array?the?source?array@b@?*?@return?the?sorted?array?(never?{@code?null})@b@?*/@b@public?static?String[]?sortStringArray(String[]?array)?{@b@if?(ObjectUtils.isEmpty(array))?{@b@return?new?String[0];@b@}@b@Arrays.sort(array);@b@return?array;@b@}@b@@b@/**@b@?*?Copy?the?given?Collection?into?a?String?array.@b@?*?The?Collection?must?contain?String?elements?only.@b@?*?@param?collection?the?Collection?to?copy@b@?*?@return?the?String?array?({@code?null}?if?the?passed-in@b@?*?Collection?was?{@code?null})@b@?*/@b@public?static?String[]?toStringArray(Collection?collection)?{@b@if?(collection?==?null)?{@b@return?null;@b@}@b@return?collection.toArray(new?String[collection.size()]);@b@}@b@@b@/**@b@?*?Copy?the?given?Enumeration?into?a?String?array.@b@?*?The?Enumeration?must?contain?String?elements?only.@b@?*?@param?enumeration?the?Enumeration?to?copy@b@?*?@return?the?String?array?({@code?null}?if?the?passed-in@b@?*?Enumeration?was?{@code?null})@b@?*/@b@public?static?String[]?toStringArray(Enumeration?enumeration)?{@b@if?(enumeration?==?null)?{@b@return?null;@b@}@b@List?list?=?Collections.list(enumeration);@b@return?list.toArray(new?String[list.size()]);@b@}@b@@b@/**@b@?*?Trim?the?elements?of?the?given?String?array,@b@?*?calling?{@code?String.trim()}?on?each?of?them.@b@?*?@param?array?the?original?String?array@b@?*?@return?the?resulting?array?(of?the?same?size)?with?trimmed?elements@b@?*/@b@public?static?String[]?trimArrayElements(String[]?array)?{@b@if?(ObjectUtils.isEmpty(array))?{@b@return?new?String[0];@b@}@b@String[]?result?=?new?String[array.length];@b@for?(int?i?=?0;?i??set?=?new?TreeSet();@b@for?(String?element?:?array)?{@b@set.add(element);@b@}@b@return?toStringArray(set);@b@}@b@@b@/**@b@?*?Split?a?String?at?the?first?occurrence?of?the?delimiter.@b@?*?Does?not?include?the?delimiter?in?the?result.@b@?*?@param?toSplit?the?string?to?split@b@?*?@param?delimiter?to?split?the?string?up?with@b@?*?@return?a?two?element?array?with?index?0?being?before?the?delimiter,?and@b@?*?index?1?being?after?the?delimiter?(neither?element?includes?the?delimiter);@b@?*?or?{@code?null}?if?the?delimiter?wasn't?found?in?the?given?input?String@b@?*/@b@public?static?String[]?split(String?toSplit,?String?delimiter)?{@b@if?(!hasLength(toSplit)?||?!hasLength(delimiter))?{@b@return?null;@b@}@b@int?offset?=?toSplit.indexOf(delimiter);@b@if?(offset?Will?trim?both?the?key?and?value?before?adding?them?to?the@b@?*?{@code?Properties}?instance.@b@?*?@param?array?the?array?to?process@b@?*?@param?delimiter?to?split?each?element?using?(typically?the?equals?symbol)@b@?*?@return?a?{@code?Properties}?instance?representing?the?array?contents,@b@?*?or?{@code?null}?if?the?array?to?process?was?null?or?empty@b@?*/@b@public?static?Properties?splitArrayElementsIntoProperties(String[]?array,?String?delimiter)?{@b@return?splitArrayElementsIntoProperties(array,?delimiter,?null);@b@}@b@@b@/**@b@?*?Take?an?array?Strings?and?split?each?element?based?on?the?given?delimiter.@b@?*?A?{@code?Properties}?instance?is?then?generated,?with?the?left?of?the@b@?*?delimiter?providing?the?key,?and?the?right?of?the?delimiter?providing?the?value.@b@?*?

Will?trim?both?the?key?and?value?before?adding?them?to?the@b@?*?{@code?Properties}?instance.@b@?*?@param?array?the?array?to?process@b@?*?@param?delimiter?to?split?each?element?using?(typically?the?equals?symbol)@b@?*?@param?charsToDelete?one?or?more?characters?to?remove?from?each?element@b@?*?prior?to?attempting?the?split?operation?(typically?the?quotation?mark@b@?*?symbol),?or?{@code?null}?if?no?removal?should?occur@b@?*?@return?a?{@code?Properties}?instance?representing?the?array?contents,@b@?*?or?{@code?null}?if?the?array?to?process?was?{@code?null}?or?empty@b@?*/@b@public?static?Properties?splitArrayElementsIntoProperties(@b@String[]?array,?String?delimiter,?String?charsToDelete)?{@b@@b@if?(ObjectUtils.isEmpty(array))?{@b@return?null;@b@}@b@Properties?result?=?new?Properties();@b@for?(String?element?:?array)?{@b@if?(charsToDelete?!=?null)?{@b@element?=?deleteAny(element,?charsToDelete);@b@}@b@String[]?splittedElement?=?split(element,?delimiter);@b@if?(splittedElement?==?null)?{@b@continue;@b@}@b@result.setProperty(splittedElement[0].trim(),?splittedElement[1].trim());@b@}@b@return?result;@b@}@b@@b@/**@b@?*?Tokenize?the?given?String?into?a?String?array?via?a?StringTokenizer.@b@?*?Trims?tokens?and?omits?empty?tokens.@b@?*?

The?given?delimiters?string?is?supposed?to?consist?of?any?number?of@b@?*?delimiter?characters.?Each?of?those?characters?can?be?used?to?separate@b@?*?tokens.?A?delimiter?is?always?a?single?character;?for?multi-character@b@?*?delimiters,?consider?using?{@code?delimitedListToStringArray}@b@?*?@param?str?the?String?to?tokenize@b@?*?@param?delimiters?the?delimiter?characters,?assembled?as?String@b@?*?(each?of?those?characters?is?individually?considered?as?delimiter).@b@?*?@return?an?array?of?the?tokens@b@?*?@see?java.util.StringTokenizer@b@?*?@see?String#trim()@b@?*?@see?#delimitedListToStringArray@b@?*/@b@public?static?String[]?tokenizeToStringArray(String?str,?String?delimiters)?{@b@return?tokenizeToStringArray(str,?delimiters,?true,?true);@b@}@b@@b@/**@b@?*?Tokenize?the?given?String?into?a?String?array?via?a?StringTokenizer.@b@?*?

The?given?delimiters?string?is?supposed?to?consist?of?any?number?of@b@?*?delimiter?characters.?Each?of?those?characters?can?be?used?to?separate@b@?*?tokens.?A?delimiter?is?always?a?single?character;?for?multi-character@b@?*?delimiters,?consider?using?{@code?delimitedListToStringArray}@b@?*?@param?str?the?String?to?tokenize@b@?*?@param?delimiters?the?delimiter?characters,?assembled?as?String@b@?*?(each?of?those?characters?is?individually?considered?as?delimiter)@b@?*?@param?trimTokens?trim?the?tokens?via?String's?{@code?trim}@b@?*?@param?ignoreEmptyTokens?omit?empty?tokens?from?the?result?array@b@?*?(only?applies?to?tokens?that?are?empty?after?trimming;?StringTokenizer@b@?*?will?not?consider?subsequent?delimiters?as?token?in?the?first?place).@b@?*?@return?an?array?of?the?tokens?({@code?null}?if?the?input?String@b@?*?was?{@code?null})@b@?*?@see?java.util.StringTokenizer@b@?*?@see?String#trim()@b@?*?@see?#delimitedListToStringArray@b@?*/@b@public?static?String[]?tokenizeToStringArray(@b@String?str,?String?delimiters,?boolean?trimTokens,?boolean?ignoreEmptyTokens)?{@b@@b@if?(str?==?null)?{@b@return?null;@b@}@b@StringTokenizer?st?=?new?StringTokenizer(str,?delimiters);@b@List?tokens?=?new?ArrayList();@b@while?(st.hasMoreTokens())?{@b@String?token?=?st.nextToken();@b@if?(trimTokens)?{@b@token?=?token.trim();@b@}@b@if?(!ignoreEmptyTokens?||?token.length()?>?0)?{@b@tokens.add(token);@b@}@b@}@b@return?toStringArray(tokens);@b@}@b@@b@/**@b@?*?Take?a?String?which?is?a?delimited?list?and?convert?it?to?a?String?array.@b@?*?

A?single?delimiter?can?consists?of?more?than?one?character:?It?will?still@b@?*?be?considered?as?single?delimiter?string,?rather?than?as?bunch?of?potential@b@?*?delimiter?characters?-?in?contrast?to?{@code?tokenizeToStringArray}.@b@?*?@param?str?the?input?String@b@?*?@param?delimiter?the?delimiter?between?elements?(this?is?a?single?delimiter,@b@?*?rather?than?a?bunch?individual?delimiter?characters)@b@?*?@return?an?array?of?the?tokens?in?the?list@b@?*?@see?#tokenizeToStringArray@b@?*/@b@public?static?String[]?delimitedListToStringArray(String?str,?String?delimiter)?{@b@return?delimitedListToStringArray(str,?delimiter,?null);@b@}@b@@b@/**@b@?*?Take?a?String?which?is?a?delimited?list?and?convert?it?to?a?String?array.@b@?*?

A?single?delimiter?can?consists?of?more?than?one?character:?It?will?still@b@?*?be?considered?as?single?delimiter?string,?rather?than?as?bunch?of?potential@b@?*?delimiter?characters?-?in?contrast?to?{@code?tokenizeToStringArray}.@b@?*?@param?str?the?input?String@b@?*?@param?delimiter?the?delimiter?between?elements?(this?is?a?single?delimiter,@b@?*?rather?than?a?bunch?individual?delimiter?characters)@b@?*?@param?charsToDelete?a?set?of?characters?to?delete.?Useful?for?deleting?unwanted@b@?*?line?breaks:?e.g.?"\r\n\f"?will?delete?all?new?lines?and?line?feeds?in?a?String.@b@?*?@return?an?array?of?the?tokens?in?the?list@b@?*?@see?#tokenizeToStringArray@b@?*/@b@public?static?String[]?delimitedListToStringArray(String?str,?String?delimiter,?String?charsToDelete)?{@b@if?(str?==?null)?{@b@return?new?String[0];@b@}@b@if?(delimiter?==?null)?{@b@return?new?String[]?{str};@b@}@b@List?result?=?new?ArrayList();@b@if?("".equals(delimiter))?{@b@for?(int?i?=?0;?i??0?&&?pos?<=?str.length())?{@b@//?Add?rest?of?String,?but?not?in?case?of?empty?input.@b@result.add(deleteAny(str.substring(pos),?charsToDelete));@b@}@b@}@b@return?toStringArray(result);@b@}@b@@b@/**@b@?*?Convert?a?CSV?list?into?an?array?of?Strings.@b@?*?@param?str?the?input?String@b@?*?@return?an?array?of?Strings,?or?the?empty?array?in?case?of?empty?input@b@?*/@b@public?static?String[]?commaDelimitedListToStringArray(String?str)?{@b@return?delimitedListToStringArray(str,?",");@b@}@b@@b@/**@b@?*?Convenience?method?to?convert?a?CSV?string?list?to?a?set.@b@?*?Note?that?this?will?suppress?duplicates.@b@?*?@param?str?the?input?String@b@?*?@return?a?Set?of?String?entries?in?the?list@b@?*/@b@public?static?Set?commaDelimitedListToSet(String?str)?{@b@Set?set?=?new?TreeSet();@b@String[]?tokens?=?commaDelimitedListToStringArray(str);@b@for?(String?token?:?tokens)?{@b@set.add(token);@b@}@b@return?set;@b@}@b@@b@/**@b@?*?Convenience?method?to?return?a?Collection?as?a?delimited?(e.g.?CSV)@b@?*?String.?E.g.?useful?for?{@code?toString()}?implementations.@b@?*?@param?coll?the?Collection?to?display@b@?*?@param?delim?the?delimiter?to?use?(probably?a?",")@b@?*?@param?prefix?the?String?to?start?each?element?with@b@?*?@param?suffix?the?String?to?end?each?element?with@b@?*?@return?the?delimited?String@b@?*/@b@public?static?String?collectionToDelimitedString(Collection>?coll,?String?delim,?String?prefix,?String?suffix)?{@b@if?(CollectionUtils.isEmpty(coll))?{@b@return?"";@b@}@b@StringBuilder?sb?=?new?StringBuilder();@b@Iterator>?it?=?coll.iterator();@b@while?(it.hasNext())?{@b@sb.append(prefix).append(it.next()).append(suffix);@b@if?(it.hasNext())?{@b@sb.append(delim);@b@}@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Convenience?method?to?return?a?Collection?as?a?delimited?(e.g.?CSV)@b@?*?String.?E.g.?useful?for?{@code?toString()}?implementations.@b@?*?@param?coll?the?Collection?to?display@b@?*?@param?delim?the?delimiter?to?use?(probably?a?",")@b@?*?@return?the?delimited?String@b@?*/@b@public?static?String?collectionToDelimitedString(Collection>?coll,?String?delim)?{@b@return?collectionToDelimitedString(coll,?delim,?"",?"");@b@}@b@@b@/**@b@?*?Convenience?method?to?return?a?Collection?as?a?CSV?String.@b@?*?E.g.?useful?for?{@code?toString()}?implementations.@b@?*?@param?coll?the?Collection?to?display@b@?*?@return?the?delimited?String@b@?*/@b@public?static?String?collectionToCommaDelimitedString(Collection>?coll)?{@b@return?collectionToDelimitedString(coll,?",");@b@}@b@@b@/**@b@?*?Convenience?method?to?return?a?String?array?as?a?delimited?(e.g.?CSV)@b@?*?String.?E.g.?useful?for?{@code?toString()}?implementations.@b@?*?@param?arr?the?array?to?display@b@?*?@param?delim?the?delimiter?to?use?(probably?a?",")@b@?*?@return?the?delimited?String@b@?*/@b@public?static?String?arrayToDelimitedString(Object[]?arr,?String?delim)?{@b@if?(ObjectUtils.isEmpty(arr))?{@b@return?"";@b@}@b@if?(arr.length?==?1)?{@b@return?ObjectUtils.nullSafeToString(arr[0]);@b@}@b@StringBuilder?sb?=?new?StringBuilder();@b@for?(int?i?=?0;?i??0)?{@b@sb.append(delim);@b@}@b@sb.append(arr[i]);@b@}@b@return?sb.toString();@b@}@b@@b@/**@b@?*?Convenience?method?to?return?a?String?array?as?a?CSV?String.@b@?*?E.g.?useful?for?{@code?toString()}?implementations.@b@?*?@param?arr?the?array?to?display@b@?*?@return?the?delimited?String@b@?*/@b@public?static?String?arrayToCommaDelimitedString(Object[]?arr)?{@b@return?arrayToDelimitedString(arr,?",");@b@}@b@}

總結

以上是生活随笔為你收集整理的spring字符串判空_字符串工具类StringUtils实现字符串是否中文、字符串分割/判空/替换/查找、是否包含乱码及字符串数组合并等常规操作...的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。