org.apache.dubbo.common.utils

类 StringUtils

java.lang.Object

org.apache.dubbo.common.utils.StringUtils

public final class StringUtils
extends Object

StringUtils

字段概要

字段

限定符和类型	字段和说明
static String	EMPTY
static String[]	EMPTY_STRING_ARRAY
static int	INDEX_NOT_FOUND

方法概要

限定符和类型	方法和说明
static String	camelToSplitName(String camelName, String split)
static String	getQueryStringValue(String qs, String key)
static String	getServiceKey(Map<String,String> ps)
static boolean	isAnyEmpty(String... ss) Checks if the strings contain at least on empty or null element.
static boolean	isBlank(String str)
static boolean	isContains(String[] values, String value)
static boolean	isContains(String values, String value)
static boolean	isEmpty(String str) is empty string.
static boolean	isEquals(String s1, String s2)
static boolean	isInteger(String str) is integer string.
static boolean	isJavaIdentifier(String s) Returns true if s is a legal Java identifier.
static boolean	isNoneEmpty(String... ss) Checks if the strings contain empty or null elements.
static boolean	isNotEmpty(String str) is not empty string.
static boolean	isNumeric(String str, boolean allowDot)
static String	join(Collection<String> coll, String split)
static String	join(String[] array) join string.
static String	join(String[] array, char split) join string like javascript.
static String	join(String[] array, String split) join string like javascript.
static int	length(CharSequence cs) Gets a CharSequence length or 0 if the CharSequence is null.
static int	parseInteger(String str)
static Map<String,String>	parseQueryString(String qs) parse query string to Parameters.
static String	removeEnd(String str, String remove) Removes a substring only if it is at the end of a source string, otherwise returns the source string.
static String	repeat(char ch, int repeat) Returns padding using the specified delimiter repeated to a given length.
static String	repeat(String str, int repeat) Repeat a String repeat times to form a new String.
static String	repeat(String str, String separator, int repeat) Repeat a String repeat times to form a new String, with a String separator injected each time.
static String	replace(String text, String searchString, String replacement) Replaces all occurrences of a String within another String.
static String	replace(String text, String searchString, String replacement, int max) Replaces a String with another String inside a larger String, for the first max values of the search String.
static String[]	split(String str, char ch) split.
static String	stripEnd(String str, String stripChars) Strips any of a set of characters from the end of a String.
static String	toArgumentString(Object[] args)
static String	toQueryString(Map<String,String> ps)
static String	toString(String msg, Throwable e)
static String	toString(Throwable e)
static String	translate(String src, String from, String to) translate.
static String	trim(String str)

从类继承的方法 java.lang.Object

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

字段详细资料

EMPTY

public static final String EMPTY

另请参阅:

常量字段值

INDEX_NOT_FOUND

public static final int INDEX_NOT_FOUND

另请参阅:

常量字段值

EMPTY_STRING_ARRAY

public static final String[] EMPTY_STRING_ARRAY

方法详细资料

length

public static int length(CharSequence cs)

Gets a CharSequence length or 0 if the CharSequence is null.

参数:

cs - a CharSequence or null

返回:

CharSequence length or 0 if the CharSequence is null.

repeat

public static String repeat(String str,
                            int repeat)

Repeat a String repeat times to form a new String.

 StringUtils.repeat(null, 2) = null
 StringUtils.repeat("", 0)   = ""
 StringUtils.repeat("", 2)   = ""
 StringUtils.repeat("a", 3)  = "aaa"
 StringUtils.repeat("ab", 2) = "abab"
 StringUtils.repeat("a", -2) = ""
 

参数:

str - the String to repeat, may be null

repeat - number of times to repeat str, negative treated as zero

返回:

a new String consisting of the original String repeated, null if null String input

repeat

public static String repeat(String str,
                            String separator,
                            int repeat)

Repeat a String repeat times to form a new String, with a String separator injected each time.

 StringUtils.repeat(null, null, 2) = null
 StringUtils.repeat(null, "x", 2)  = null
 StringUtils.repeat("", null, 0)   = ""
 StringUtils.repeat("", "", 2)     = ""
 StringUtils.repeat("", "x", 3)    = "xxx"
 StringUtils.repeat("?", ", ", 3)  = "?, ?, ?"
 

参数:

str - the String to repeat, may be null

separator - the String to inject, may be null

repeat - number of times to repeat str, negative treated as zero

返回:

a new String consisting of the original String repeated, null if null String input

从以下版本开始:

2.5

removeEnd

public static String removeEnd(String str,
                               String remove)

Removes a substring only if it is at the end of a source string, otherwise returns the source string.

A null source string will return null. An empty ("") source string will return the empty string. A null search string will return the source string.

 StringUtils.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"
 

参数:

str - the source String to search, may be null

remove - the String to search for and remove, may be null

返回:

the substring with the string removed if found, null if null String input

repeat

public static String repeat(char ch,
                            int repeat)

Returns padding using the specified delimiter repeated to a given length.

 StringUtils.repeat('e', 0)  = ""
 StringUtils.repeat('e', 3)  = "eee"
 StringUtils.repeat('e', -2) = ""
 

Note: this method doesn't not support padding with Unicode Supplementary Characters as they require a pair of chars to be represented. If you are needing to support full I18N of your applications consider using repeat(String, int) instead.

参数:

ch - character to repeat

repeat - number of times to repeat char, negative treated as zero

返回:

String with repeated character

另请参阅:

repeat(String, int)

stripEnd

public static String stripEnd(String str,
                              String stripChars)

Strips any of a set of characters from the end of a String.

A null input String returns null. An empty string ("") input returns the empty string.

If the stripChars String is null, whitespace is stripped as defined by Character.isWhitespace(char).

 StringUtils.stripEnd(null, *)          = null
 StringUtils.stripEnd("", *)            = ""
 StringUtils.stripEnd("abc", "")        = "abc"
 StringUtils.stripEnd("abc", null)      = "abc"
 StringUtils.stripEnd("  abc", null)    = "  abc"
 StringUtils.stripEnd("abc  ", null)    = "abc"
 StringUtils.stripEnd(" abc ", null)    = " abc"
 StringUtils.stripEnd("  abcyx", "xyz") = "  abc"
 StringUtils.stripEnd("120.00", ".0")   = "12"
 

参数:

str - the String to remove characters from, may be null

stripChars - the set of characters to remove, null treated as whitespace

返回:

the stripped String, null if null String input

replace

public static String replace(String text,
                             String searchString,
                             String replacement)

Replaces all occurrences of a String within another String.

A null reference passed to this method is a no-op.

 StringUtils.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"
 

参数:

text - text to search and replace in, may be null

searchString - the String to search for, may be null

replacement - the String to replace it with, may be null

返回:

the text with any replacements processed, null if null String input

另请参阅:

replace(String text, String searchString, String replacement, int max)

replace

public static String replace(String text,
                             String searchString,
                             String replacement,
                             int max)

Replaces a String with another String inside a larger String, for the first max values of the search String.

A null reference passed to this method is a no-op.

 StringUtils.replace(null, *, *, *)         = null
 StringUtils.replace("", *, *, *)           = ""
 StringUtils.replace("any", null, *, *)     = "any"
 StringUtils.replace("any", *, null, *)     = "any"
 StringUtils.replace("any", "", *, *)       = "any"
 StringUtils.replace("any", *, *, 0)        = "any"
 StringUtils.replace("abaa", "a", null, -1) = "abaa"
 StringUtils.replace("abaa", "a", "", -1)   = "b"
 StringUtils.replace("abaa", "a", "z", 0)   = "abaa"
 StringUtils.replace("abaa", "a", "z", 1)   = "zbaa"
 StringUtils.replace("abaa", "a", "z", 2)   = "zbza"
 StringUtils.replace("abaa", "a", "z", -1)  = "zbzz"
 

参数:

text - text to search and replace in, may be null

searchString - the String to search for, may be null

replacement - the String to replace it with, may be null

max - maximum number of values to replace, or -1 if no maximum

返回:

the text with any replacements processed, null if null String input

isBlank

public static boolean isBlank(String str)

isEmpty

public static boolean isEmpty(String str)

is empty string.

参数:

str - source string.

返回:

is empty.

isNoneEmpty

public static boolean isNoneEmpty(String... ss)

Checks if the strings contain empty or null elements.

 StringUtils.isNoneEmpty(null)            = false
 StringUtils.isNoneEmpty("")              = false
 StringUtils.isNoneEmpty(" ")             = true
 StringUtils.isNoneEmpty("abc")           = true
 StringUtils.isNoneEmpty("abc", "def")    = true
 StringUtils.isNoneEmpty("abc", null)     = false
 StringUtils.isNoneEmpty("abc", "")       = false
 StringUtils.isNoneEmpty("abc", " ")      = true
 

参数:

ss - the strings to check

返回:

true if all strings are not empty or null

isAnyEmpty

public static boolean isAnyEmpty(String... ss)

Checks if the strings contain at least on empty or null element.

 StringUtils.isAnyEmpty(null)            = true
 StringUtils.isAnyEmpty("")              = true
 StringUtils.isAnyEmpty(" ")             = false
 StringUtils.isAnyEmpty("abc")           = false
 StringUtils.isAnyEmpty("abc", "def")    = false
 StringUtils.isAnyEmpty("abc", null)     = true
 StringUtils.isAnyEmpty("abc", "")       = true
 StringUtils.isAnyEmpty("abc", " ")      = false
 

参数:

ss - the strings to check

返回:

true if at least one in the strings is empty or null

isNotEmpty

public static boolean isNotEmpty(String str)

is not empty string.

参数:

str - source string.

返回:

is not empty.

isEquals

public static boolean isEquals(String s1,
                               String s2)

参数:

s1 -

s2 -

返回:

equals

isInteger

public static boolean isInteger(String str)

is integer string.

参数:

str -

返回:

is integer

parseInteger

public static int parseInteger(String str)

isJavaIdentifier

public static boolean isJavaIdentifier(String s)

Returns true if s is a legal Java identifier.

more info.

isContains

public static boolean isContains(String values,
                                 String value)

isContains

public static boolean isContains(String[] values,
                                 String value)

参数:

values -

value -

返回:

contains

isNumeric

public static boolean isNumeric(String str,
                                boolean allowDot)

toString

public static String toString(Throwable e)

参数:

e -

返回:

string

toString

public static String toString(String msg,
                              Throwable e)

参数:

msg -

e -

返回:

string

translate

public static String translate(String src,
                               String from,
                               String to)

translate.

参数:

src - source string.

from - src char table.

to - target char table.

返回:

String.

split

public static String[] split(String str,
                             char ch)

split.

参数:

ch - char.

返回:

string array.

join

public static String join(String[] array)

join string.

参数:

array - String array.

返回:

String.

join

public static String join(String[] array,
                          char split)

join string like javascript.

参数:

array - String array.

split - split

返回:

String.

join

public static String join(String[] array,
                          String split)

join string like javascript.

参数:

array - String array.

split - split

返回:

String.

join

public static String join(Collection<String> coll,
                          String split)

getQueryStringValue

public static String getQueryStringValue(String qs,
                                         String key)

parseQueryString

public static Map<String,String> parseQueryString(String qs)

parse query string to Parameters.

参数:

qs - query string.

返回:

Parameters instance.

getServiceKey

public static String getServiceKey(Map<String,String> ps)

toQueryString

public static String toQueryString(Map<String,String> ps)

camelToSplitName

public static String camelToSplitName(String camelName,
                                      String split)

toArgumentString

public static String toArgumentString(Object[] args)

trim

public static String trim(String str)