程序包 com.alibaba.nacos.common.utils

类 StringUtils

java.lang.Object

com.alibaba.nacos.common.utils.StringUtils

public class StringUtils
extends java.lang.Object

string util.

作者:

Nacos, zzq

字段概要

字段

修饰符和类型	字段	说明
static java.lang.String	COMMA
static java.lang.String	DOT
static java.lang.String	EMPTY
private static int	INDEX_NOT_FOUND
static java.lang.String	LF

构造器概要

构造器

构造器	说明
StringUtils()

方法概要

修饰符和类型	方法	说明
static boolean	contains(java.lang.CharSequence str, java.lang.CharSequence searchStr)	Checks if CharSequence contains a search CharSequence.
static boolean	containsIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr)	Checks if CharSequence contains a search CharSequence irrespective of case, handling null.
static java.lang.String	defaultIfEmpty(java.lang.String str, java.lang.String defaultStr)	Returns either the passed in CharSequence, or if the CharSequence is empty or null, the value of defaultStr.
static java.lang.String	deleteWhitespace(java.lang.String str)	Deletes all whitespaces from a String as defined by Character.isWhitespace(char).
static boolean	equals(java.lang.String str1, java.lang.String str2)	Compares two CharSequences, returning true if they represent equal sequences of characters.
static boolean	equalsIgnoreCase(java.lang.String str1, java.lang.String str2)	Compares two CharSequences, returning true if they represent equal sequences of characters, ignoring case.
static java.lang.String	escapeJavaScript(java.lang.String str)
private static void	escapeJavaStyleString(java.io.Writer out, java.lang.String str, boolean escapeSingleQuote, boolean escapeForwardSlash)
private static java.lang.String	escapeJavaStyleString(java.lang.String str, boolean escapeSingleQuotes, boolean escapeForwardSlash)
private static java.lang.String	hex(char ch)
static boolean	isAnyBlank(java.lang.CharSequence... css)	Checks if any one of the CharSequences are blank ("") or null and not whitespace only..
static boolean	isBlank(java.lang.CharSequence cs)	Checks if a string is empty (""), null and whitespace only.
static boolean	isEmpty(java.lang.String str)	Checks if a str is empty ("") or null.
static boolean	isNoneBlank(java.lang.CharSequence... css)	Checks if none of the CharSequences are blank ("") or null and whitespace only..
static boolean	isNotBlank(java.lang.String str)	Checks if a string is not empty (""), not null and not whitespace only.
static boolean	isNotEmpty(java.lang.String str)	Checks if a str is not empty ("") or not null.
static java.lang.String	join(java.util.Collection collection, java.lang.String separator)	Joins the elements of the provided array into a single String containing the provided list of elements.
static java.lang.String	newStringForUtf8(byte[] bytes)	Create a string with encoding format as utf8.
static java.lang.String[]	split(java.lang.String str, java.lang.String separatorChars)	Splits the provided text into an array with a maximum length, separators specified.
static boolean	startsWith(java.lang.CharSequence str, java.lang.CharSequence prefix)	Check if a CharSequence starts with a specified prefix.
private static boolean	startsWith(java.lang.CharSequence str, java.lang.CharSequence prefix, boolean ignoreCase)	Check if a CharSequence starts with a specified prefix (optionally case insensitive).
static boolean	startsWithIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence prefix)	Case insensitive check if a CharSequence starts with a specified prefix.
static java.lang.String	substringBetween(java.lang.String str, java.lang.String open, java.lang.String close)	Substring between two index.
static java.lang.String	trim(java.lang.String str)	Removes control characters (char <= 32) from both ends of this String, handling null by returning null.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

DOT

public static final java.lang.String DOT

另请参阅:

常量字段值

INDEX_NOT_FOUND

private static final int INDEX_NOT_FOUND

另请参阅:

常量字段值

COMMA

public static final java.lang.String COMMA

另请参阅:

常量字段值

EMPTY

public static final java.lang.String EMPTY

另请参阅:

常量字段值

LF

public static final java.lang.String LF

另请参阅:

常量字段值

构造器详细资料

StringUtils

public StringUtils()

方法详细资料

newStringForUtf8

public static java.lang.String newStringForUtf8(byte[] bytes)

Create a string with encoding format as utf8.

参数:

bytes - the bytes that make up the string

返回:

created string

isBlank

public static boolean isBlank(java.lang.CharSequence cs)

Checks if a string is empty (""), null and whitespace only.

参数:

cs - the string to check

返回:

true if the string is empty and null and whitespace

isNotBlank

public static boolean isNotBlank(java.lang.String str)

Checks if a string is not empty (""), not null and not whitespace only.

参数:

str - the string to check, may be null

返回:

true if the string is not empty and not null and not whitespace

isNotEmpty

public static boolean isNotEmpty(java.lang.String str)

Checks if a str is not empty ("") or not null.

参数:

str - the str to check, may be null

返回:

true if the str is not empty or not null

isEmpty

public static boolean isEmpty(java.lang.String str)

Checks if a str is empty ("") or null.

参数:

str - the str to check, may be null

返回:

true if the str is empty or null

defaultIfEmpty

public static java.lang.String defaultIfEmpty(java.lang.String str,
                                              java.lang.String defaultStr)

Returns either the passed in CharSequence, or if the CharSequence is empty or null, the value of defaultStr.

参数:

str - the CharSequence to check, may be null

defaultStr - the default CharSequence to return if the input is empty ("") or null, may be null

返回:

the passed in CharSequence, or the default

equals

public static boolean equals(java.lang.String str1,
                             java.lang.String str2)

Compares two CharSequences, returning true if they represent equal sequences of characters.

参数:

str1 - the first string, may be null

str2 - the second string, may be null

返回:

true if the string are equal (case-sensitive), or both null

另请参阅:

Object.equals(Object)

trim

public static java.lang.String trim(java.lang.String str)

Removes control characters (char <= 32) from both ends of this String, handling null by returning null.

参数:

str - the String to be trimmed, may be null

返回:

the trimmed string, null if null String input

substringBetween

public static java.lang.String substringBetween(java.lang.String str,
                                                java.lang.String open,
                                                java.lang.String close)

Substring between two index.

参数:

str - string

open - start index to sub

close - end index to sub

返回:

substring

join

public static java.lang.String join(java.util.Collection collection,
                                    java.lang.String separator)

Joins the elements of the provided array into a single String containing the provided list of elements.

参数:

collection - the Collection of values to join together, may be null

separator - the separator string to use

返回:

the joined String, null if null array input

escapeJavaScript

public static java.lang.String escapeJavaScript(java.lang.String str)

escapeJavaStyleString

private static java.lang.String escapeJavaStyleString(java.lang.String str,
                                                      boolean escapeSingleQuotes,
                                                      boolean escapeForwardSlash)

escapeJavaStyleString

private static void escapeJavaStyleString(java.io.Writer out,
                                          java.lang.String str,
                                          boolean escapeSingleQuote,
                                          boolean escapeForwardSlash)
                                   throws java.io.IOException

抛出:

java.io.IOException

hex

private static java.lang.String hex(char ch)

containsIgnoreCase

public static boolean containsIgnoreCase(java.lang.CharSequence str,
                                         java.lang.CharSequence searchStr)

Checks if CharSequence contains a search CharSequence irrespective of case, handling null. Case-insensitivity is defined as by String.equalsIgnoreCase(String).

A null CharSequence will return false.

参数:

str - the CharSequence to check, may be null

searchStr - the CharSequence to find, may be null

返回:

true if the CharSequence contains the search CharSequence irrespective of case or false if not or null string input

contains

public static boolean contains(java.lang.CharSequence str,
                               java.lang.CharSequence searchStr)

Checks if CharSequence contains a search CharSequence.

参数:

str - the CharSequence to check, may be null

searchStr - the CharSequence to find, may be null

返回:

true if the CharSequence contains the search CharSequence

isNoneBlank

public static boolean isNoneBlank(java.lang.CharSequence... css)

Checks if none of the CharSequences are blank ("") or null and whitespace only..

参数:

css - the CharSequences to check, may be null or empty

返回:

true if none of the CharSequences are blank or null or whitespace only

isAnyBlank

public static boolean isAnyBlank(java.lang.CharSequence... css)

Checks if any one of the CharSequences are blank ("") or null and not whitespace only..

参数:

css - the CharSequences to check, may be null or empty

返回:

true if any of the CharSequences are blank or null or whitespace only

startsWith

public static boolean startsWith(java.lang.CharSequence str,
                                 java.lang.CharSequence prefix)

Check if a CharSequence starts with a specified prefix.

nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case sensitive.

参数:

str - the CharSequence to check, may be null

prefix - the prefix to find, may be null

返回:

true if the CharSequence starts with the prefix, case sensitive, or both null

另请参阅:

String.startsWith(String)

startsWith

private static boolean startsWith(java.lang.CharSequence str,
                                  java.lang.CharSequence prefix,
                                  boolean ignoreCase)

Check if a CharSequence starts with a specified prefix (optionally case insensitive).

参数:

str - the CharSequence to check, may be null

prefix - the prefix to find, may be null

ignoreCase - indicates whether the compare should ignore case (case insensitive) or not.

返回:

true if the CharSequence starts with the prefix or both null

另请参阅:

String.startsWith(String)

startsWithIgnoreCase

public static boolean startsWithIgnoreCase(java.lang.CharSequence str,
                                           java.lang.CharSequence prefix)

Case insensitive check if a CharSequence starts with a specified prefix.

nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case insensitive.

参数:

str - the CharSequence to check, may be null

prefix - the prefix to find, may be null

返回:

true if the CharSequence starts with the prefix, case insensitive, or both null

另请参阅:

String.startsWith(String)

deleteWhitespace

public static java.lang.String deleteWhitespace(java.lang.String str)

Deletes all whitespaces from a String as defined by Character.isWhitespace(char).

参数:

str - the String to delete whitespace from, may be null

返回:

the String without whitespaces, null if null String input

equalsIgnoreCase

public static boolean equalsIgnoreCase(java.lang.String str1,
                                       java.lang.String str2)

Compares two CharSequences, returning true if they represent equal sequences of characters, ignoring case.

参数:

str1 - the first string, may be null

str2 - the second string, may be null

返回:

true if the string are equal, case insensitive, or both null

split

public static java.lang.String[] split(java.lang.String str,
                                       java.lang.String separatorChars)

Splits the provided text into an array with a maximum length, separators specified. If separatorChars is empty, divide by blank.

参数:

str - the String to parse, may be null

返回:

an array of parsed Strings