org.apache.commons.lang.StringUtils的常用方法
2024-09-28 18:28:04
org.apache.commons.lang.StringUtils是apache的commons-lang-x.x.jar下的包,里面包含很多字符串操作方法,
官网(http://commons.apache.org/proper/commons-lang/javadocs/api-release/index.html)介绍的常用方法如下:
public class StringUtils
extends Object
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
部分方法的示例:
package com.led.test; import org.apache.commons.lang.StringUtils; public class Test3 {
@SuppressWarnings("deprecation")
public static void main(String[] args) {
//找到2个字符串第一个出现不同的位置(1开始)
String difference = StringUtils.difference("s123", "s13");
System.out.println(difference);//3 //判断2个字符串是否相等
boolean equals = StringUtils.equals("s1", "s1");
System.out.println(equals);//true //判断字符串里面是否含有特定字符串
boolean b2 = StringUtils.contains("asd", "as");
System.out.println(b2);//true //把数组的元素用:进行拼接
String concatStr = StringUtils.join(new String[]{"dog", "cat", "monkey"},":");
System.out.println(concatStr);//dog:cat:monkey //根据特定分隔符对字符串进行拆分
String[] split = StringUtils.split("apple|xiaomi|dell|lenovo", "|");
for (String s1 : split) {
System.out.print(s1 + "、");//apple、xiaomi、dell、lenovo、
}
System.out.println(); //所有单词首字母大写
String capitaliseAllWords = StringUtils.capitaliseAllWords("today i will go to china");
System.out.println(capitaliseAllWords);//Today I Will Go To China //统计某个字符串在字符串出现的次数
int matchCount = StringUtils.countMatches("Happy Birthday to you", "o");
System.out.println(matchCount);//2 //必须要8位,不够的就拿0去字符串左边补
String leftPad = StringUtils.leftPad("54", 8, "0");
System.out.println(leftPad);//00000054 //必须要8位,不够的就拿0去字符串右边补
String rightPad = StringUtils.rightPad("54", 8, "0");
System.out.println(rightPad);//54000000 //判断字符串是否以特定字符串开头,区分大小写
boolean startsWith = StringUtils.startsWith("GoodMorning", "go");
System.out.println(startsWith);//false //判断字符串是否以特定字符串开头,区分大小写
boolean endsWith = StringUtils.endsWith("GoodMorning", "ing");
System.out.println(endsWith);//true }
}
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