辅助字符串处理类：org.apache.commons.lang3.StringUtils

api 地址：http://commons.apache.org/proper/commons-lang/apidocs/index.html?index-all.html
StringUtils 常用方法：

方法	作用
isBlank	判断某字符串是否为空、长度为0、由空白符(whitespace) 构成。isBlank(" ")为true。多数情况用 isBlank
isEmpty	判断某字符串是否为空，为空的标准是 strnull 或 str.length()0。isEmpty(" ")为false
trim	去掉字符串两端的控制符(control characters, char <= 32)。如果为null或""，则返回null
strip	去掉字符串两端的空白符(whitespace)。如果输入为null则返回null

StringUtils 说明：

Operations on String that are null safe.

IsEmpty/IsBlank - checks if a String contains text

Trim/Strip - removes leading and trailing whitespace

Equals/Compare - compares two strings null-safe

startsWith - check if a String starts with a prefix null-safe

endsWith - check if a String ends with a suffix null-safe

IndexOf/LastIndexOf/Contains - null-safe index-of checks

IndexOfAny/LastIndexOfAny/IndexOfAnyBut/LastIndexOfAnyBut - index-of any of a set of Strings

ContainsOnly/ContainsNone/ContainsAny - does String contains only/none/any of these characters

Substring/Left/Right/Mid - null-safe substring extractions

SubstringBefore/SubstringAfter/SubstringBetween - substring extraction relative to other strings

Split/Join - splits a String into an array of substrings and vice versa

Remove/Delete - removes part of a String

Replace/Overlay - Searches a String and replaces one String with another

Chomp/Chop - removes the last part of a String

AppendIfMissing - appends a suffix to the end of the String if not present

PrependIfMissing - prepends a prefix to the start of the String if not present

LeftPad/RightPad/Center/Repeat - pads a String

UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize - changes the case of a String

CountMatches - counts the number of occurrences of one String in another

IsAlpha/IsNumeric/IsWhitespace/IsAsciiPrintable - checks the characters in a String

DefaultString - protects against a null input String

Rotate - rotate (circular shift) a String

Reverse/ReverseDelimited - reverses a String

Abbreviate - abbreviates a string using ellipsis or another given String

Difference - compares Strings and reports on their differences

LevenshteinDistance - the number of changes needed to change one String into another

The StringUtils class defines certain words related to String handling.

null - null

empty - a zero-length string ("")

space - the space character (' ', char 32)

whitespace - the characters defined by Character.isWhitespace(char)

trim - the characters <= 32 as in String.trim()

巴特西

辅助字符串处理类：org.apache.commons.lang3.StringUtils

最新文章

热门文章