// true,为null或者size==0，返回trueboolean empty = StringUtils.isEmpty("");// false,与isEmpty相反boolean notEmpty = StringUtils.isNotEmpty("");// true,数组中有一个为null或size==0的字符串，则返回trueboolean anyEmpty = StringUtils.isAnyEmpty(new String[] { "aa", "" });// false,全部都不为空，返回trueboolean noneEmpty = StringUtils.isNoneEmpty(new String[] { "", "aa" });// true,全部为空，返回trueboolean allEmpty = StringUtils.isAllEmpty(new String[] { "", "" });// true,为null或者size==0或者只存在空白字符(如" ")，则返回trueboolean blank = StringUtils.isBlank(" ");// false,与isBlank相反boolean notBlank = StringUtils.isNotBlank(" ");// true,数组中任何一个为null或者空字符串或者空白字符，则返回trueboolean anyBlank = StringUtils.isAnyBlank(new String[] { "dd", " " });// false,与isAnyBlank 相反boolean noneBlank = StringUtils.isNoneBlank(new String[] { "dd", "" });// true,数组中的数据全部为null，或者空字符串或者空白字符，则返回trueboolean allBlank = StringUtils.isAllBlank(new String[] { "", " " });// dd,去掉前后字符，为null,返回nullString trim = StringUtils.trim(" dd ");// "",为null或者size==0，则返回空字符串String trimToEmpty = StringUtils.trimToEmpty(" ");// null,为null或者size==0，则返回nullString trimToNull = StringUtils.trimToNull(" ");// abc,截取字符串String truncate = StringUtils.truncate("abcde", 3);// cdefg,从第二个起，截取5个长度String truncate = StringUtils.truncate("abcdefghl", 2, 5);// ddds与trim类似String strip = StringUtils.strip(" dd d s ");// yes, it is,去掉指定的开头字符和结尾字符,第二个字符为dd或者da也会有同样输出String strip = StringUtils.strip("ddyes, it is ddd", "d");// yes, it is dddString stripStart = StringUtils.stripStart("ddyes, it is ddd", "d");// ddyes, it isString stripEnd = StringUtils.stripEnd("ddyes, it is ddd", "d");// [it is, dd],去掉参数中所有元素的前后空格String[] stripAll = StringUtils.stripAll(" it is ", " dd ");// [it is , it],去掉数组中每个元素前后的指定字符String[] stripAll = StringUtils.stripAll(new String[] { "ddit is d", "ditd" }, "d");// falseboolean equals = StringUtils.equals(null, "");// trueboolean equalsIgnoreCase = StringUtils.equalsIgnoreCase("abc", "ABC");// [,ab,cde, dsd,] 2个元素,默认分隔符为空白字符String[] split = StringUtils.split(",ab,cde dsd,");// [ab, cde , dsd] 3个元素，去掉了为空的元素，空白字符组成的字符串会保留String[] split = StringUtils.split(",ab,cde ,,dsd,", ",");// [ab, cde, dsd] 3个元素，以,和空白字符分隔，第二个参数中每个字符都当成一个分隔符，与上一个方法比，放方法第二个元素后没有空白字符String[] split = StringUtils.split(",ab,cde ,,dsd,", ", ");// [ab, cde ,,dsd,] 2个元素，由于最大只允许2个String[] split = StringUtils.split(",ab,cde ,,dsd,", ", ", 2);// [,ab,cde , ,dsd,] 2个元素，第二个参数所有字符当成一个整体的分隔符String[] splitByWholeSeparator = StringUtils.splitByWholeSeparator(",ab,cde , ,dsd,", ", ");// [, dd, ]，3个元素，两个空的String[] splitPreserveAllTokens = StringUtils.splitPreserveAllTokens(" dd ");// [, aa, , ],4个元素，3个空的String[] splitPreserveAllTokens = StringUtils.splitPreserveAllTokens(",aa,,", ",");// [, aa, , bb, ] 5个元素，以,或者空白字符分隔String[] splitPreserveAllTokens = StringUtils.splitPreserveAllTokens(",aa, bb,", ", ");// [,aa, bb,] 2个，以, 作为一个整体分隔String[] splitByWholeSeparatorPreserveAllTokens = StringUtils.splitByWholeSeparatorPreserveAllTokens(",aa, bb,",", ");// [ABC, 123, abc, ;,., I, t] 6个元素String[] splitByCharacterType = StringUtils.splitByCharacterType("ABC123abc;,.It");String join = StringUtils.join("12", "a", "df", "3"); // 12adf3List<String> ls = new ArrayList<>();ls.add("aa");ls.add("bb");ls.add("cc");// insert into table values ('aa','bb','cc');,在组织'aa','bb','cc'String join = "'" + StringUtils.join(ls, "','") + "'";// abcString deleteWhitespace = StringUtils.deleteWhitespace(" a b c ");// abc is itString remove = StringUtils.remove("abcdd is dddit", "d");// dit isdd，只删除第一个参数起始处中对应的第二个参数。String removeStart = StringUtils.removeStart("ddit isdd", "d");// ddit isd, 只删除第一个参数结束处中对应的第二个参数。String removeEnd = StringUtils.removeEnd("ddit isdd", "d");// it isString removeIgnoreCase = StringUtils.removeIgnoreCase("ddit isdd", "D");// rdit// isdd,虽然replace的功能已经包含有replaceOne，但如果确定只有一个需要替换，最好还是使用replaceOne，因为这个找到一个替换后就会停止查找String replaceOnce = StringUtils.replaceOnce("ddit isdd", "d", "r");// rdit isddString replaceOnceIgnoreCase = StringUtils.replaceOnceIgnoreCase("ddit isdd", "D", "r");// rrit isrrString replace = StringUtils.replace("ddit isdd", "d", "r");// rrit isrrString replaceIgnoreCase = StringUtils.replaceIgnoreCase("ddit isdd", "D", "r");// rris isrr,批量替换String replaceEach = StringUtils.replaceEach("ddit isdd", new String[] { "d", "t" }, new String[] { "r", "s" });// tcteString replaceEachRepeatedly = StringUtils.replaceEachRepeatedly("abcde", new String[] { "ab", "d" },new String[] { "d", "t" });// aaaaaa 将第一个参数重复第二个参数次，形成一个新的字符串String repeat = StringUtils.repeat("aa", 3);// aa,aa,aa 将第一个参数重复第三个参数次，并且以第二个参数分隔，形成一个新的字符串String repeat = StringUtils.repeat("aa", ",", 3);// ab，在左侧填充两个空白字符，形成一个4个字符的字符串，String leftPad = StringUtils.leftPad("ab", 4);// ab ，在两边填充空白字符，形成一个以第一个参数为中心的4个字符串长度字符串String center = StringUtils.center("ab", 4);// true,正整数返回trueboolean numeric = StringUtils.isNumeric("123");// true 正整数，且包含有空白字符或者空字符串，空白字符，返回trueboolean numericSpace = StringUtils.isNumericSpace("12 3");// 5417543010，获取字符串中的数字，并拼接在一起String digits = StringUtils.getDigits("(541) 754-3010");// true,字符串size==0或者空白字符，返回true，null及其他字符返回falseboolean whitespace = StringUtils.isWhitespace(" ");// abcdefg...，显示指定长度的字符串，多余的使用...String abbreviate = StringUtils.abbreviate("abcdefghijklmnopq", 10);// abcdefg***String abbreviate = StringUtils.abbreviate("abcdefghijklmnopq", "***", 10);// abcd***opqString abbreviateMiddle = StringUtils.abbreviateMiddle("abcdefghijklmnopq", "***", 10);// a，获取数组共所有元素相同的前缀String commonPrefix = StringUtils.getCommonPrefix("abcdf", "ads", "arf");// true, endsWith同理boolean startsWith = StringUtils.startsWith("abcdef", "ab");// true，endsWithIgnoreCase同理boolean startsWithIgnoreCase = StringUtils.startsWithIgnoreCase("abcdefg", "aB");// true,第一个参数的前缀匹配第二个数组参数中的任何一个元素时，返回true，endsWithAny同理boolean startsWithAny = StringUtils.startsWithAny("abcdef", new String[] { "x", "ab", " " });// abcxyzddd,如果出第一个参数的后缀包含在后面参数中，则直接返回第一个参数，否则将返回第一个参数+第二个参数String appendIfMissing = StringUtils.appendIfMissing("abcxyz", "ddd", new String[] { "qwe", "123" });// dddabcxyz,原理同上String prependIfMissing = StringUtils.prependIfMissing("abcxyz", "ddd", new String[] { "qwe", "123" });// cbdString encodedString = StringUtils.toEncodedString(new byte[] { 'c', 'b', 'd' }, Charset.defaultCharset());// "xxx"String wrap = StringUtils.wrap("xxx", "\"");// *xx*String wrapIfMissing = StringUtils.wrapIfMissing("xx", "*");// 前后必须有相同字符才可以unwrapString unwrap = StringUtils.unwrap("'aa'", "'");// {97,98,99}int[] codePoints = StringUtils.toCodePoints("abc");// abc，删除最后一个字符，如果是\r\n则一起删除String chop = StringUtils.chop("abc\r\n");// abc,如果最后存在换行符，则删除最后的换行符String chomp = StringUtils.chomp("abc\r\n");// trueboolean contains = StringUtils.contains("abcd", "ab");// trueboolean containsAny = StringUtils.containsAny("abcdefg", "2", "a");// falseboolean containsOnly = StringUtils.containsOnly("abcdefg", "aa");// trueboolean containsIgnoreCase = StringUtils.containsIgnoreCase("abcdef", "aB");// falseboolean containsNone = StringUtils.containsNone("abcdef", 'a', 'x');// trueboolean containsWhitespace = StringUtils.containsWhitespace("aa bbc");// 此外还有substring，indexof等方法