commons-lang3-StringUtils
字符串工具类
abbreviate(String str, int maxWidth) 返回一个指定长度加省略号的字符串,maxWidth必须大于3StringUtils.abbreviate(null, *) = null StringUtils.abbreviate("", 4) = "" StringUtils.abbreviate("abcdefg", 6) = "abc..." StringUtils.abbreviate("abcdefg", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", 8) = "abcdefg" StringUtils.abbreviate("abcdefg", 4) = "a..." StringUtils.abbreviate("abcdefg", 3) = IllegalArgumentExceptionabbreviate(String str, int offset, int maxWidth) 返回一个指定长度加省略号的字符串,maxWidth必须大于3abbreviate(String str, String abbrevMarker, int maxWidth) 返回一个自定义省略号的指定长度字符串,maxWidth必须大于3StringUtils.abbreviate(null, "...", *) = null StringUtils.abbreviate("abcdefg", null, *) = "abcdefg" StringUtils.abbreviate("", "...", 4) = "" StringUtils.abbreviate("abcdefg", ".", 5) = "abcd." StringUtils.abbreviate("abcdefg", ".", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", ".", 8) = "abcdefg" StringUtils.abbreviate("abcdefg", "..", 4) = "ab.." StringUtils.abbreviate("abcdefg", "..", 3) = "a.." StringUtils.abbreviate("abcdefg", "..", 2) = IllegalArgumentException StringUtils.abbreviate("abcdefg", "...", 3) = IllegalArgumentExceptionabbreviateMiddle(String str, String abbrevMarker, int maxWidth) 将字符串缩短到指定长度(length),字符串的中间部分用替换字符串(middle)显示
StringUtils.abbreviateMiddle("abc", null, 0) = "abc" StringUtils.abbreviateMiddle("abc", ".", 0) = "abc" StringUtils.abbreviateMiddle("abc", ".", 3) = "abc" StringUtils.abbreviateMiddle("abcdef", ".", 4) = "ab.f"
appendIfMissing(String str, CharSequence suffix, CharSequence... suffixes) 如果str不是以任何suffixes结尾,将字符串suffix拼接到字符串str后面
StringUtils.appendIfMissing(null, null) = null StringUtils.appendIfMissing("abc", null) = "abc" StringUtils.appendIfMissing("", "xyz") = "xyz" StringUtils.appendIfMissing("abc", "xyz") = "abcxyz" StringUtils.appendIfMissing("abcxyz", "xyz") = "abcxyz" StringUtils.appendIfMissing("abcXYZ", "xyz") = "abcXYZxyz"appendIfMissingIgnoreCase(String str, CharSequence suffix, CharSequence... suffixes) 同上 不区分大小写capitalize(String str) 将字符串第一个字符大写并返回 center(String str, int size) 用空格字符填充使字符串str位于长度为size的大字符串中间StringUtils.center(null, *) = null StringUtils.center("", 4) = " " StringUtils.center("ab", -1) = "ab" StringUtils.center("ab", 4) = " ab " StringUtils.center("abcd", 2) = "abcd" StringUtils.center("a", 4) = " a "center(String str, int size, char padChar) 用指定字符填充使字符串str位于长度为size的大字符串中间 chomp(String str) 删除字符串末尾的一个换行符,返回一个新的字符串(换行符"n", "r", or "rn")StringUtils.chomp(null) = null StringUtils.chomp("") = "" StringUtils.chomp("abc \r") = "abc " StringUtils.chomp("abc\n") = "abc" StringUtils.chomp("abc\r\n") = "abc" StringUtils.chomp("abc\r\n\r\n") = "abc\r\n" StringUtils.chomp("abc\n\r") = "abc\n" StringUtils.chomp("abc\n\rabc") = "abc\n\rabc" StringUtils.chomp("\r") = "" StringUtils.chomp("\n") = "" StringUtils.chomp("\r\n") = ""chop(String str) 删除字符串末尾的一个字符,返回一个新的字符串StringUtils.chop(null) = null StringUtils.chop("") = "" StringUtils.chop("abc \r") = "abc " StringUtils.chop("abc\n") = "abc" StringUtils.chop("abc\r\n") = "abc" StringUtils.chop("abc") = "ab" StringUtils.chop("abc\nabc") = "abc\nab" StringUtils.chop("a") = "" StringUtils.chop("\r") = "" StringUtils.chop("\n") = "" StringUtils.chop("\r\n") = ""compare(String str1, String str2) 比较两个字符串,返回一个int值str1等于str2(或都为空)返回0 str1小于str2返回小于0 str1大于str2返回大于0 StringUtils.compare(null, null) = 0 StringUtils.compare(null , "a") < 0 StringUtils.compare("a", null) > 0 StringUtils.compare("abc", "abc") = 0 StringUtils.compare("a", "b") < 0 StringUtils.compare("b", "a") > 0 StringUtils.compare("a", "B") > 0 StringUtils.compare("ab", "abc") < 0contains(CharSequence seq, CharSequence searchSeq) 检查字符串中是否包含指定字符,返回boolean
StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true StringUtils.contains("abc", "a") = true StringUtils.contains("abc", "z") = false
containsAny(CharSequence cs, CharSequence... searchCharSequences) 检查字符串中是否包含任一字符,返回booleanStringUtils.containsAny(null, *) = false StringUtils.containsAny("", *) = false StringUtils.containsAny(*, null) = false StringUtils.containsAny(*, []) = false StringUtils.containsAny("abcd", "ab", null) = true StringUtils.containsAny("abcd", "ab", "cd") = true StringUtils.containsAny("abc", "d", "abc") = truecontainsNone(CharSequence cs, String invalidChars) 检查字符串不包含指定字符,返回booleanStringUtils.containsNone(null, *) = true StringUtils.containsNone(*, null) = true StringUtils.containsNone("", *) = true StringUtils.containsNone("ab", "") = true StringUtils.containsNone("abab", "xyz") = true StringUtils.containsNone("ab1", "xyz") = true StringUtils.containsNone("abz", "xyz") = falsecontainsOnly(CharSequence cs, String validChars) 检查字符串只包含特定的字符,返回booleanStringUtils.containsOnly(null, *) = false StringUtils.containsOnly(*, null) = false StringUtils.containsOnly("", *) = true StringUtils.containsOnly("ab", "") = false StringUtils.containsOnly("abab", "abc") = true StringUtils.containsOnly("ab1", "abc") = false StringUtils.containsOnly("abz", "abc") = falsecontainsWhitespace(CharSequence seq) 检查字符串中是否包含空格字符,返回boolean countMatches(CharSequence str, CharSequence sub) 检查字符串中出现指定字符的次数,返回一个int值StringUtils.countMatches(null, *) = 0 StringUtils.countMatches("", *) = 0 StringUtils.countMatches("abba", null) = 0 StringUtils.countMatches("abba", "") = 0 StringUtils.countMatches("abba", "a") = 2 StringUtils.countMatches("abba", "ab") = 1 StringUtils.countMatches("abba", "xxx") = 0defaultIfBlank(T str, T defaultStr) 如果字符串为null、空(""),或全是空格,将返回指定字符串,否则返回原值 defaultIfEmpty(T str, T defaultStr) 如果字符串为null、空(""),将返回指定字符串,否则返回原值StringUtils.defaultIfEmpty(null, "NULL") = "NULL" StringUtils.defaultIfEmpty("", "NULL") = "NULL" StringUtils.defaultIfEmpty(" ", "NULL") = " " StringUtils.defaultIfEmpty("bat", "NULL") = "bat" StringUtils.defaultIfEmpty("", null) = nulldefaultString(String str) 如果字符串为null,将返回空的字符串(""),否则返回原值StringUtils.defaultString(null) = "" StringUtils.defaultString("") = "" StringUtils.defaultString("bat") = "bat"defaultString(String str, String defaultStr) 如果字符串为null,将返回指定字符,否则返回原值StringUtils.defaultString(null, "NULL") = "NULL" StringUtils.defaultString("", "NULL") = "" StringUtils.defaultString("bat", "NULL") = "bat"deleteWhitespace(String str) 删除字符串中的空格字符,并返回新的字符串StringUtils.deleteWhitespace(null) = null StringUtils.deleteWhitespace("") = "" StringUtils.deleteWhitespace("abc") = "abc" StringUtils.deleteWhitespace(" ab c ") = "abc"difference(String str1, String str2) 比较两个字符串差异,并返回差异的字符,返回第二个字符串的剩余部分,这意味着“ABC”和“AB”之间的区别是空字符串而不是“C”。StringUtils.difference(null, null) = null StringUtils.difference("", "") = "" StringUtils.difference("", "abc") = "abc" StringUtils.difference("abc", "") = "" StringUtils.difference("abc", "abc") = "" StringUtils.difference("abc", "ab") = "" StringUtils.difference("ab", "abxyz") = "xyz" StringUtils.difference("abcde", "abxyz") = "xyz" StringUtils.difference("abcde", "xyz") = "xyz"endsWith(CharSequence str, CharSequence suffix) 检查字符串是否以指定字符结尾,返回一个booleanStringUtils.endsWith(null, null) = true StringUtils.endsWith(null, "def") = false StringUtils.endsWith("abcdef", null) = false StringUtils.endsWith("abcdef", "def") = true StringUtils.endsWith("ABCDEF", "def") = false StringUtils.endsWith("ABCDEF", "cde") = false StringUtils.endsWith("ABCDEF", "") = trueendsWithAny(CharSequence sequence, CharSequence... searchStrings) 检查字符串是否以指定字符数组结尾,返回一个booleanStringUtils.endsWithAny(null, null) = false StringUtils.endsWithAny(null, new String[] {"abc"}) = false StringUtils.endsWithAny("abcxyz", null) = false StringUtils.endsWithAny("abcxyz", new String[] {""}) = true StringUtils.endsWithAny("abcxyz", new String[] {"xyz"}) = true StringUtils.endsWithAny("abcxyz", new String[] {null, "xyz", "abc"}) = true StringUtils.endsWithAny("abcXYZ", "def", "XYZ") = true StringUtils.endsWithAny("abcXYZ", "def", "xyz") = falseendsWithIgnoreCase(CharSequence str, CharSequence suffix) 检查字符串是否以指定字符(不区分大小写)结尾,返回一个booleanStringUtils.endsWithIgnoreCase(null, null) = true StringUtils.endsWithIgnoreCase(null, "def") = false StringUtils.endsWithIgnoreCase("abcdef", null) = false StringUtils.endsWithIgnoreCase("abcdef", "def") = true StringUtils.endsWithIgnoreCase("ABCDEF", "def") = true StringUtils.endsWithIgnoreCase("ABCDEF", "cde") = falseequals(CharSequence cs1, CharSequence cs2) 比较两个字符串是否相等,返回一个booleanStringUtils.equals(null, null) = true StringUtils.equals(null, "abc") = false StringUtils.equals("abc", null) = false StringUtils.equals("abc", "abc") = true StringUtils.equals("abc", "ABC") = falseequalsAnyIgnoreCase(CharSequence string, CharSequence... searchStrings) 比较两个字符串是否相等(不区分大小写),返回一个booleanStringUtils.equalsIgnoreCase(null, null) = true StringUtils.equalsIgnoreCase(null, "abc") = false StringUtils.equalsIgnoreCase("abc", null) = false StringUtils.equalsIgnoreCase("abc", "abc") = true StringUtils.equalsIgnoreCase("abc", "ABC") = trueequalsAny(CharSequence string, CharSequence... searchStrings) 比较字符串是否与指定字符串数组中某一值相等,返回一个booleanStringUtils.equalsAny(null, (CharSequence[]) null) = false StringUtils.equalsAny(null, null, null) = true StringUtils.equalsAny(null, "abc", "def") = false StringUtils.equalsAny("abc", null, "def") = false StringUtils.equalsAny("abc", "abc", "def") = true StringUtils.equalsAny("abc", "ABC", "DEF") = falseequalsAnyIgnoreCase(CharSequence string, CharSequence... searchStrings) 比较字符串是否与指定字符串数组中某一值相等(不区分大小写),返回一个booleanStringUtils.equalsAnyIgnoreCase(null, (CharSequence[]) null) = false StringUtils.equalsAnyIgnoreCase(null, null, null) = true StringUtils.equalsAnyIgnoreCase(null, "abc", "def") = false StringUtils.equalsAnyIgnoreCase("abc", null, "def") = false StringUtils.equalsAnyIgnoreCase("abc", "abc", "def") = true StringUtils.equalsAnyIgnoreCase("abc", "ABC", "DEF") = truegetCommonPrefix(String... strs) 获取字符串数组元素公共字符,返回stringStringUtils.getCommonPrefix(null) = "" StringUtils.getCommonPrefix(new String[] {}) = "" StringUtils.getCommonPrefix(new String[] {"abc"}) = "abc" StringUtils.getCommonPrefix(new String[] {null, null}) = "" StringUtils.getCommonPrefix(new String[] {"", ""}) = "" StringUtils.getCommonPrefix(new String[] {"", null}) = "" StringUtils.getCommonPrefix(new String[] {"abc", null, null}) = "" StringUtils.getCommonPrefix(new String[] {null, null, "abc"}) = "" StringUtils.getCommonPrefix(new String[] {"", "abc"}) = "" StringUtils.getCommonPrefix(new String[] {"abc", ""}) = "" StringUtils.getCommonPrefix(new String[] {"abc", "abc"}) = "abc" StringUtils.getCommonPrefix(new String[] {"abc", "a"}) = "a" StringUtils.getCommonPrefix(new String[] {"ab", "abxyz"}) = "ab" StringUtils.getCommonPrefix(new String[] {"abcde", "abxyz"}) = "ab" StringUtils.getCommonPrefix(new String[] {"abcde", "xyz"}) = "" StringUtils.getCommonPrefix(new String[] {"xyz", "abcde"}) = "" StringUtils.getCommonPrefix(new String[] {"i am a machine", "i am a robot"}) = "i am a "indexOf(CharSequence seq, CharSequence searchSeq) 检查指定字符在字符串中出现的位置,返回一个int值StringUtils.indexOf(null, *) = -1 StringUtils.indexOf(*, null) = -1 StringUtils.indexOf("", "") = 0 StringUtils.indexOf("", *) = -1 (except when * = "") StringUtils.indexOf("aabaabaa", "a") = 0 StringUtils.indexOf("aabaabaa", "b") = 2 StringUtils.indexOf("aabaabaa", "ab") = 1 StringUtils.indexOf("aabaabaa", "") = 0indexOfIgnoreCase(CharSequence seq, CharSequence searchSeq) 检查指定字符在字符串中出现的位置(不区分大小写),返回一个int值 isAllBlank(CharSequence... css) 检查数组所有字符是否为null、empty、或全是空格字符,返回一个booleanStringUtils.isAllBlank(null) = true StringUtils.isAllBlank(null, "foo") = false StringUtils.isAllBlank(null, null) = true StringUtils.isAllBlank("", "bar") = false StringUtils.isAllBlank("bob", "") = false StringUtils.isAllBlank(" bob ", null) = false StringUtils.isAllBlank(" ", "bar") = false StringUtils.isAllBlank("foo", "bar") = false StringUtils.isAllBlank(new String[] {}) = trueisAllEmpty(CharSequence... css) 检查数组所有字符是否为null、empty,返回一个booleanStringUtils.isAllEmpty(null) = true StringUtils.isAllEmpty(null, "") = true StringUtils.isAllEmpty(new String[] {}) = true StringUtils.isAllEmpty(null, "foo") = false StringUtils.isAllEmpty("", "bar") = false StringUtils.isAllEmpty("bob", "") = false StringUtils.isAllEmpty(" bob ", null) = false StringUtils.isAllEmpty(" ", "bar") = false StringUtils.isAllEmpty("foo", "bar") = falseisAllLowerCase(CharSequence cs) 检查字符串中所有字符是否是小写,返回一个boolean isAllUpperCase(CharSequence cs) 检查字符串中所有字符是否是大写,返回一个boolean isAnyBlank(CharSequence... css) 检查数组中字符串是否有一个为null、empty或全是空格字符,返回一个booleanStringUtils.isAnyBlank(null) = true StringUtils.isAnyBlank(null, "foo") = true StringUtils.isAnyBlank(null, null) = true StringUtils.isAnyBlank("", "bar") = true StringUtils.isAnyBlank("bob", "") = true StringUtils.isAnyBlank(" bob ", null) = true StringUtils.isAnyBlank(" ", "bar") = true StringUtils.isAnyBlank(new String[] {}) = false StringUtils.isAnyBlank(new String[]{""}) = true StringUtils.isAnyBlank("foo", "bar") = falseisAnyEmpty(CharSequence... css) 检查数组中字符串是否有一个为null、empty,返回一个booleanStringUtils.isAnyEmpty(null) = true StringUtils.isAnyEmpty(null, "foo") = true StringUtils.isAnyEmpty("", "bar") = true StringUtils.isAnyEmpty("bob", "") = true StringUtils.isAnyEmpty(" bob ", null) = true StringUtils.isAnyEmpty(" ", "bar") = false StringUtils.isAnyEmpty("foo", "bar") = false StringUtils.isAnyEmpty(new String[]{}) = false StringUtils.isAnyEmpty(new String[]{""}) = trueisBlank(CharSequence cs) 检查字符串是否为null、empty或空格字符,返回一个booleanStringUtils.isBlank(null) = true StringUtils.isBlank("") = true StringUtils.isBlank(" ") = true StringUtils.isBlank("bob") = false StringUtils.isBlank(" bob ") = falseisEmpty(CharSequence cs) 检查字符串是否为null、empty,返回一个booleanStringUtils.isEmpty(null) = true StringUtils.isEmpty("") = true StringUtils.isEmpty(" ") = false StringUtils.isEmpty("bob") = false StringUtils.isEmpty(" bob ") = falseisNotBlank(CharSequence cs) 检查字符串是否不为null、empty或空格字符,返回一个boolean isNotEmpty(CharSequence cs) 检查字符串是否不为null、empty,返回一个boolean isNumeric(CharSequence cs) 检查字符串是否是数字,返回一个booleanStringUtils.isNumeric(null) = false StringUtils.isNumeric("") = false StringUtils.isNumeric(" ") = false StringUtils.isNumeric("123") = true StringUtils.isNumeric("१२३") = true StringUtils.isNumeric("12 3") = false StringUtils.isNumeric("ab2c") = false StringUtils.isNumeric("12-3") = false StringUtils.isNumeric("12.3") = false StringUtils.isNumeric("-123") = false StringUtils.isNumeric("+123") = falseisWhitespace(CharSequence cs) 检查字符串是否是空格字符,返回一个booleanStringUtils.isWhitespace(null) = false StringUtils.isWhitespace("") = true StringUtils.isWhitespace(" ") = true StringUtils.isWhitespace("abc") = false StringUtils.isWhitespace("ab2c") = false StringUtils.isWhitespace("ab-c") = falsejoin(byte[] array, char separator) 将字节数组转换成string,以指定字符分隔StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"char、double、float、int、long、short、object、T同理 joinWith(String separator, Object... objects) 将多个元素已指定字符分隔拼接成StringStringUtils.joinWith(",", {"a", "b"}) = "a,b" StringUtils.joinWith(",", {"a", "b",""}) = "a,b," StringUtils.joinWith(",", {"a", null, "b"}) = "a,,b" StringUtils.joinWith(null, {"a", "b"}) = "ab"lastIndexOf(CharSequence seq, CharSequence searchSeq) 获取指定字符在字符串中的最后一个索引位置StringUtils.lastIndexOf(null, *) = -1 StringUtils.lastIndexOf(*, null) = -1 StringUtils.lastIndexOf("", "") = 0 StringUtils.lastIndexOf("aabaabaa", "a") = 7 StringUtils.lastIndexOf("aabaabaa", "b") = 5 StringUtils.lastIndexOf("aabaabaa", "ab") = 4 StringUtils.lastIndexOf("aabaabaa", "") = 8left(String str, int len) 返回从左边开始指定大小的字符串StringUtils.left(null, *) = null StringUtils.left(*, -ve) = "" StringUtils.left("", *) = "" StringUtils.left("abc", 0) = "" StringUtils.left("abc", 2) = "ab" StringUtils.left("abc", 4) = "abc"right(String str, int len) 同上相反 length(CharSequence cs) 获取字符串大小,返回一个int lowerCase(String str) 将字符串转换为小写,返回一个stringStringUtils.lowerCase(null) = null StringUtils.lowerCase("") = "" StringUtils.lowerCase("aBc") = "abc"upperCase(String str) 同上相反 mid(String str, int pos, int len) 获取字符串指定位置区间的字符,返回一个stringStringUtils.mid(null, *, *) = null StringUtils.mid(*, *, -ve) = "" StringUtils.mid("", 0, *) = "" StringUtils.mid("abc", 0, 2) = "ab" StringUtils.mid("abc", 0, 4) = "abc" StringUtils.mid("abc", 2, 4) = "c" StringUtils.mid("abc", 4, 2) = "" StringUtils.mid("abc", -2, 2) = "ab"overlay(String str, String overlay, int start, int end) 在字符串位置区间插入指定字符,返回一个stringStringUtils.overlay(null, *, *, *) = null StringUtils.overlay("", "abc", 0, 0) = "abc" StringUtils.overlay("abcdef", null, 2, 4) = "abef" StringUtils.overlay("abcdef", "", 2, 4) = "abef" StringUtils.overlay("abcdef", "", 4, 2) = "abef" StringUtils.overlay("abcdef", "zzzz", 2, 4) = "abzzzzef" StringUtils.overlay("abcdef", "zzzz", 4, 2) = "abzzzzef" StringUtils.overlay("abcdef", "zzzz", -1, 4) = "zzzzef" StringUtils.overlay("abcdef", "zzzz", 2, 8) = "abzzzz" StringUtils.overlay("abcdef", "zzzz", -2, -3) = "zzzzabcdef" StringUtils.overlay("abcdef", "zzzz", 8, 10) = "abcdefzzzz"prependIfMissing(String str, CharSequence prefix, CharSequence... prefixes) 在字符串最左边插入指定字符,如果已存在,将不插入,返回一个stringStringUtils.prependIfMissing(null, null) = null StringUtils.prependIfMissing("abc", null) = "abc" StringUtils.prependIfMissing("", "xyz") = "xyz" StringUtils.prependIfMissing("abc", "xyz") = "xyzabc" StringUtils.prependIfMissing("xyzabc", "xyz") = "xyzabc" StringUtils.prependIfMissing("XYZabc", "xyz") = "xyzXYZabc"prependIfMissingIgnoreCase(String str, CharSequence prefix, CharSequence... prefixes) 同上,只是不区分大小写 remove(String str, char remove) 删除字符串中指定字符,返回一个stringStringUtils.remove(null, *) = null StringUtils.remove("", *) = "" StringUtils.remove("queued", 'u') = "qeed" StringUtils.remove("queued", 'z') = "queued"removeIgnoreCase(String str, String remove) 同上,只是不区分大小写 removeAll(String text, String regex) 根据匹配规则删除所有字符,返回一个stringStringUtils.removeAll(null, *) = null StringUtils.removeAll("any", null) = "any" StringUtils.removeAll("any", "") = "any" StringUtils.removeAll("any", ".*") = "" StringUtils.removeAll("any", ".+") = "" StringUtils.removeAll("abc", ".?") = "" StringUtils.removeAll("A<__>\n<__>B", "<.*>") = "A\nB" StringUtils.removeAll("A<__>\n<__>B", "(?s)<.*>") = "AB" StringUtils.removeAll("ABCabc123abc", "[a-z]") = "ABC123"removeEnd(String str, String remove) 删除字符串结尾指定字符,返回一个stringStringUtils.removeEnd(null, *) = null StringUtils.removeEnd("", *) = "" StringUtils.removeEnd(*, null) = * StringUtils.removeEnd("www.domain.com", ".com.") = "www.domain.com" StringUtils.removeEnd("www.domain.com", ".com") = "www.domain" StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com" StringUtils.removeEnd("abc", "") = "abc"removeStart(String str, String remove) 同上相反 removeEndIgnoreCase(String str, String remove) 同上,只是不区分大小写 removeFirst(String text, String regex) 根据匹配规则删除第一次出现的字符,返回一个stringStringUtils.removeFirst(null, *) = null StringUtils.removeFirst("any", null) = "any" StringUtils.removeFirst("any", "") = "any" StringUtils.removeFirst("any", ".*") = "" StringUtils.removeFirst("any", ".+") = "" StringUtils.removeFirst("abc", ".?") = "bc" StringUtils.removeFirst("A<__>\n<__>B", "<.*>") = "A\n<__>B" StringUtils.removeFirst("A<__>\n<__>B", "(?s)<.*>") = "AB" StringUtils.removeFirst("ABCabc123", "[a-z]") = "ABCbc123" StringUtils.removeFirst("ABCabc123abc", "[a-z]+") = "ABC123abc"repeat(String str, int repeat) 将字符重复指定次数拼接成新的字符串,返回一个stringStringUtils.repeat(null, 2) = null StringUtils.repeat("", 0) = "" StringUtils.repeat("", 2) = "" StringUtils.repeat("a", 3) = "aaa" StringUtils.repeat("ab", 2) = "abab" StringUtils.repeat("a", -2) = ""replace(String text, String searchString, String replacement) 用replacement替换字符串中的所有searchString,返回一个stringStringUtils.replace(null, *, *) = null StringUtils.replace("", *, *) = "" StringUtils.replace("any", null, *) = "any" StringUtils.replace("any", *, null) = "any" StringUtils.replace("any", "", *) = "any" StringUtils.replace("aba", "a", null) = "aba" StringUtils.replace("aba", "a", "") = "b" StringUtils.replace("aba", "a", "z") = "zbz"reverse(String str) 将字符串反转,返回一个stringStringUtils.reverse(null) = null StringUtils.reverse("") = "" StringUtils.reverse("bat") = "tab"reverseDelimited(String str, char separatorChar) 将字符串指定分隔符出的字符反转StringUtils.reverseDelimited(null, *) = null StringUtils.reverseDelimited("", *) = "" StringUtils.reverseDelimited("a.b.c", 'x') = "a.b.c" StringUtils.reverseDelimited("a.b.c", ".") = "c.b.a"split(String str, String separatorChars) 将字符串以指定字符分隔,返回数组StringUtils.split(null, *) = null StringUtils.split("", *) = [] StringUtils.split("abc def", null) = ["abc", "def"] StringUtils.split("abc def", " ") = ["abc", "def"] StringUtils.split("abc def", " ") = ["abc", "def"] StringUtils.split("ab:cd:ef", ":") = ["ab", "cd", "ef"]substring(String str, int start) 将字符串从指定位置区间截取,返回string swapCase(String str) 将字符串大小写互转,返回一个stringStringUtils.swapCase(null) = null StringUtils.swapCase("") = "" StringUtils.swapCase("The dog has a BONE") = "tHE DOG HAS A bone"toEncodedString(byte[] bytes, Charset charset) 将字符串转为指定编码格式,返回一个string trim(String str) 去除字符串空格 trimToEmpty(String str) 去除字符串空格,null转为empty,返回一个stringStringUtils.trimToEmpty(null) = "" StringUtils.trimToEmpty("") = "" StringUtils.trimToEmpty(" ") = "" StringUtils.trimToEmpty("abc") = "abc" StringUtils.trimToEmpty(" abc ") = "abc"---------------------来源:CSDN
原文:https://blog.csdn.net/u012240455/article/details/79014224
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