Class StringUtils
org.apache.commons commons-lang33.8
import org.apache.commons.lang3.stringUtils
scala> val s1="1234567890" s1: String = 1234567890 scala> val s2="abcdefghij" s2: String = abcdefghija
scala> StringUtils.a abbreviate abbreviateMiddle appendIfMissing appendIfMissingIgnoreCaseabbreviate vs abbreviateMiddle
功能 字符串缩写abbreviate 缩写后的位数要大于3abbreviateMiddle 中间值填充 ，注意生效条件
源码
public static String abbreviateMiddle(String str, String middle, int length) {
if (!isEmpty(str) && !isEmpty(middle)) {
if (length < str.length() && length >= middle.length() + 2) {
int targetSting = length - middle.length();
int startOffset = targetSting / 2 + targetSting % 2;
int endOffset = str.length() - targetSting / 2;
StringBuilder builder = new StringBuilder(length);
builder.append(str.substring(0, startOffset));
builder.append(middle);
builder.append(str.substring(endOffset));
return builder.toString();
} else {
return str;
}
} else {
return str;
}
}
scala> StringUtils.abbreviate(s1,4) res52: String = 1... scala> StringUtils.abbreviate(s1,3) java.lang.IllegalArgumentException: Minimum abbreviation width is 4 at org.apache.commons.lang3.StringUtils.abbreviate(StringUtils.java:7365) at org.apache.commons.lang3.StringUtils.abbreviate(StringUtils.java:7322) ... 50 elided scala> StringUtils.abbreviateMiddle(s1,"***",8) res54: String = 123***90appendIfMissing appendIfMissingIgnoreCase
scala> StringUtils.appendIfMissing(s2,"xyz") res56: String = abcdefghijxyz scala> StringUtils.appendIfMissing(s2,"hij") res57: String = abcdefghij //不忽略大小写 scala> StringUtils.appendIfMissing(s2,"HIJ") res58: String = abcdefghijHIJ // 忽略大小写 scala> StringUtils.appendIfMissingIgnoreCase(s2,"HIJ") res59: String = abcdefghijc
scala> StringUtils.c capitalize chomp compare contains containsIgnoreCase containsOnly countMatches center chop compareIgnoreCase containsAny containsNone containsWhitespacecapitalize 首字母大写 chomp 切除后面的字符串
scala> StringUtils.chomp("123abc","abc")
warning: there was one deprecation warning; re-run with -deprecation for details
res119: String = 123
scala> StringUtils.chomp("123abc","ab")
warning: there was one deprecation warning; re-run with -deprecation for details
res120: String = 123abc
compare
contains vs containsIgnoreCase vs containsAny
containsAny 字符串是否包含子字符串中任意的字符
scala> StringUtils.containsAny("abc123","123")
res122: Boolean = true
scala> StringUtils.containsAny("abc123","124")
res123: Boolean = true
containsWhitespace 是否包含空格、回车、换行符
scala> StringUtils.containsWhitespace("abc de")
res130: Boolean = true
scala> StringUtils.containsWhitespace("abcnde")
res131: Boolean = true
scala> StringUtils.containsWhitespace("abcrde")
res132: Boolean = true
d
scala> StringUtils.d defaultIfBlank defaultIfEmpty defaultString deleteWhitespace differencedefaultIfBlank vs defaultIfEmpty defaultString deleteWhitespace 删除字符中空白
scala> StringUtils.deleteWhitespace("abcrde")
res133: String = abcde
scala> StringUtils.deleteWhitespace("abcnde")
res134: String = abcde
scala> StringUtils.deleteWhitespace("abc nde")
res135: String = abcnde
difference
e
scala> StringUtils.e endsWith endsWithAny endsWithIgnoreCase equals equalsAny equalsAnyIgnoreCase equalsIgnoreCaseendsWith
是否否以子字符串结尾 endsWithAny
是否以指定的一个或者多个字符串中的其中一个结尾 endsWithIgnoreCas equals vs equalsAny vs equalsAnyIgnoreCase vs equalsIgnoreCase g
scala> StringUtils.get getCommonPrefix getFuzzyDistance getJaroWinklerDistance getLevenshteinDistancegetCommonPrefix getFuzzyDistance getJaroWinklerDistance getLevenshteinDistance i
scala> StringUtils.i indexOf indexOfIgnoreCase isAlphaSpace isAnyEmpty isNoneBlank isNumeric indexOfAny isAllLowerCase isAlphanumeric isAsciiPrintable isNoneEmpty isNumericSpace indexOfAnyBut isAllUpperCase isAlphanumericSpace isBlank isNotBlank isWhitespace indexOfDifference isAlpha isAnyBlank isEmpty isNotEmptyj
scala> StringUtils.join join joinWithl
scala> StringUtils.l lastIndexOf lastIndexOfAny lastIndexOfIgnoreCase lastOrdinalIndexOf left leftPad length lowerCaseleftPad vs rightPad
左右侧填充空格或者其他
scala> StringUtils.rightPad("123456",10)
res206: String = "123456 "
scala> StringUtils.rightPad("123456",10,"*")
res207: String = 123456****
scala> StringUtils.leftPad("123456",10,"*")
left leftPad
scala> StringUtils.leftPad("123456",10,"*")
res208: String = ****123456
scala> StringUtils.leftPad("123456",10)
res209: String = " 123456"
left vs right
从左边或者右边截取指定长度的字符串
scala> StringUtils.right("123456abc",4)
res198: String = 6abc
scala> StringUtils.left("123456abc",4)
res199: String = 1234
length
返回字符串的长度 m
StringUtils.midn
StringUtils.normalizeSpaceo
scala> StringUtils.o ordinalIndexOf overlayp
scala> StringUtils.prependIfMissing prependIfMissing prependIfMissingIgnoreCaseprependIfMissing vs prependIfMissingIgnoreCase
参考 append r
scala> StringUtils.r remove removeIgnoreCase replace replaceFirst reverse removeAll removePattern replaceAll replaceIgnoreCase reverseDelimited removeEnd removeStart replaceChars replaceonce right removeEndIgnoreCase removeStartIgnoreCase replaceEach replaceonceIgnoreCase rightPad removeFirst repeat replaceEachRepeatedly replacePattern rotaterotate
旋转字符串
scala> StringUtils.rotate("123456",1)
res201: String = 612345
scala> StringUtils.rotate("123456",-1)
res202: String = 234561
scala> StringUtils.rotate("123456",6)
res203: String = 123456
scala> StringUtils.rotate("123456",8)
res204: String = 561234
replaceEachRepeatedly
repeat
重复字符串
scala> StringUtils.repeat("*!",4)
res200: String = *!*!*!*!
rightPad vs leftPad
左右侧填充空格或者其他
scala> StringUtils.rightPad("123456",10)
res206: String = "123456 "
scala> StringUtils.rightPad("123456",10,"*")
res207: String = 123456****
scala> StringUtils.leftPad("123456",10,"*")
left leftPad
scala> StringUtils.leftPad("123456",10,"*")
res208: String = ****123456
scala> StringUtils.leftPad("123456",10)
res209: String = " 123456"
replace vs replaceIgnoreCase
搜索替换字符串是否忽略大小写
scala> StringUtils.replace replace replaceChars replaceEachRepeatedly replaceIgnoreCase replaceonceIgnoreCase replaceAll replaceEach replaceFirst replaceonce replacePattern
scala> StringUtils.replace("abc123abc123","abc","xyz")
res194: String = xyz123xyz123
scala> StringUtils.replace("abc123abc123","aBc","xyz")
res195: String = abc123abc123
scala> StringUtils.replaceIgnoreCase("abc123abc123","aBc","xyz")
res196: String = xyz123xyz123
replace First
搜索替换第一个字符串
scala> StringUtils.replaceFirst("abc123abc123","abc","xyz")
res197: String = xyz123abc123
replaceonce vs replaceonceIgnoreCase
只替换一次是否忽略大小写 replaceEach replacePattern replaceChars right vs left
从左边或者右边截取指定长度的字符串
scala> StringUtils.right("123456abc",4)
res198: String = 6abc
scala> StringUtils.left("123456abc",4)
res199: String = 1234
remove vs removeIgnoreCase
scala> StringUtils.remove remove removeEnd removeFirst removePattern removeStartIgnoreCase removeAll removeEndIgnoreCase removeIgnoreCase removeStart
remove 删除字符串的某一部分removeIgnoreCase 删除字符串的某一部分 (忽略大小写)
scala> StringUtils.remove("123abc123ABC1234","123")
res187: String = abcABC4
removeStart vs removeEnd vs removeStartIgnoreCase vs removeEndIgnoreCase
删除开头或者结尾子串
scala> StringUtils.removeStart("123abc123ABC1234","123")
res191: String = abc123ABC1234
removeFirst
删除第一个符合的字符串
scala> StringUtils.removeFirst("123abc123ABC1234","abc")
res189: String = 123123ABC1234
removeAll
removePattern
reverse
反转字符串 replaceAll replaceIgnoreCase reverseDelimited s
scala> StringUtils.s split splitPreserveAllTokens stripAccents stripTonull substringBeforeLast splitByCharacterType startsWith stripAll substring substringBetween splitByCharacterTypeCamelCase startsWithAny stripEnd substringAfter substringsBetween splitByWholeSeparator startsWithIgnoreCase stripStart substringAfterLast swapCase splitByWholeSeparatorPreserveAllTokens strip stripToEmpty substringBeforesplit
分割字符串
scala> StringUtils.split("1,2,3,45",",")
res165: Array[String] = Array(1, 2, 3, 45)
splitPreserveAllTokens
stripAccents
substringBeforeLast
splitByCharacterType
startsWith
是否以某字符串开始 stripAll substring substringBetween splitByWholeSeparator startsWithIgnoreCase substringAfterLas swapCase
大小写转换
scala> StringUtils.swapCase("abcABC")
res172: String = ABCabc
splitByWholeSeparatorPreserveAllTokens
strip vs stripStart vs stripEnd
strip 去除字符串两边的字符串
scala> StringUtils.stripStart("123abc123","123")
res169: String = abc123
scala> StringUtils.stripEnd("123abc123","123")
res170: String = 123abc
scala> StringUtils.strip("123abc123","123")
res171: String = abc
stripTonull vs stripToEmpty
如果传入的参数为null ，则返回空字符或者null，其余功能和strip一致 substringBefore t
scala> StringUtils.t toEncodedString toString trim trimToEmpty trimTonull truncatetoEncodedString trim
-去除字符串两边的空白
trimToEmpt去除字符串两边的空白，如果字符串为null，则返回空字符 trimTonull
去除字符串两边的空白，如果字符串为空字符和null，则返回null
scala> StringUtils.trimTonull("")
res158: String = null
scala> StringUtils.trimToEmpty("")
res159: String = ""
scala> StringUtils.trim("")
res160: String = ""
truncate
截取字符串
scala> StringUtils.truncate("123456",3)
res163: String = 123
u
scala> StringUtils.u uncapitalize upperCaseuncapitalize 首字母小写
scala> StringUtils.uncapitalize("ABC")
res115: String = aBC
upperCase 转成大写
scala> StringUtils.upperCase("ABCabc")
res117: String = ABCABC
w
scala> StringUtils.wrap wrap wrapIfMissingwrap vs wrapIfMissing
用指定字符串填充两边字符wrapIfMissing 没有的话填充，有的话忽略
scala> StringUtils.wrapIfMissing("**123*","**")
res113: String = **123***
scala> StringUtils.wrap("**123*","**")
res114: String = ****123***
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