程序包 org.apache.dubbo.common.utils

类 StringUtils

  • public final class StringUtils
extends Object
    StringUtils

    • 字段详细资料

      • 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

      • EQUAL_CHAR

        public static final char EQUAL_CHAR
        从以下版本开始:
        2.7.5
        另请参阅:
        常量字段值

      • EQUAL

        public static final String EQUAL

      • AND_CHAR

        public static final char AND_CHAR
        另请参阅:
        常量字段值

      • AND

        public static final String AND

      • SEMICOLON_CHAR

        public static final char SEMICOLON_CHAR
        另请参阅:
        常量字段值

      • SEMICOLON

        public static final String SEMICOLON

      • QUESTION_MASK_CHAR

        public static final char QUESTION_MASK_CHAR
        另请参阅:
        常量字段值

      • QUESTION_MASK

        public static final String QUESTION_MASK

      • SLASH_CHAR

        public static final char SLASH_CHAR
        另请参阅:
        常量字段值

      • SLASH

        public static final String SLASH

      • HYPHEN_CHAR

        public static final char HYPHEN_CHAR
        另请参阅:
        常量字段值

      • HYPHEN

        public static final String HYPHEN

    • 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​(CharSequence cs)

      • 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 str,
                                 char ch)

      • isNotContains

        public static boolean isNotContains​(String str,
                                    char ch)

      • 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.

      • splitToList

        public static List<String> splitToList​(String str,
                                       char ch)
        Splits String around matches of the given character.

        Note: Compare with split(String, char), this method reduce memory copy.

      • splitToSet

        public static Set<String> splitToSet​(String value,
                                     char separatorChar)
        Split the specified value to be a Set
        参数:
        value - the content to be split
        separatorChar - a char to separate
        返回:
        non-null read-only Set
        从以下版本开始:
        2.7.8

      • splitToSet

        public static Set<String> splitToSet​(String value,
                                     char separatorChar,
                                     boolean trimElements)
        Split the specified value to be a Set
        参数:
        value - the content to be split
        separatorChar - a char to separate
        trimElements - require to trim the elements or not
        返回:
        non-null read-only Set
        从以下版本开始:
        2.7.8

      • 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.

      • 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.

      • camelToSplitName

        public static String camelToSplitName​(String camelName,
                                      String split)

      • toArgumentString

        public static String toArgumentString​(Object[] args)

      • toOSStyleKey

        public static String toOSStyleKey​(String key)

      • isAllUpperCase

        public static boolean isAllUpperCase​(String str)

      • delimitedListToStringArray

        public static String[] delimitedListToStringArray​(String str,
                                                  String delimiter)

      • delimitedListToStringArray

        public static String[] delimitedListToStringArray​(String str,
                                                  String delimiter,
                                                  String charsToDelete)

      • arrayToDelimitedString

        public static String arrayToDelimitedString​(Object[] arr,
                                            String delim)

      • nullSafeToString

        public static String nullSafeToString​(Object obj)

      • parseParameters

        public static Map<String,​String> parseParameters​(String rawParameters)
        参数:
        rawParameters - format like '[{a:b},{c:d}]'
        返回:

      • decodeHexNibble

        public static int decodeHexNibble​(char c)

      • decodeHexByte

        public static byte decodeHexByte​(CharSequence s,
                                 int pos)
        Decode a 2-digit hex byte from within a string.

      • toCommaDelimitedString

        public static String toCommaDelimitedString​(String one,
                                            String... others)
        Create the common-delimited String by one or more String members
        参数:
        one - one String
        others - others String
        返回:
        null if one or others is null
        从以下版本开始:
        2.7.8