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com.easyjf.util
类 StringUtils

java.lang.Object

  com.easyjf.util.StringUtils

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public abstract class StringUtils

extends java.lang.Object

Miscellaneous string utility methods. Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of string utilities.

This class delivers some simple functionality that should really be provided by the core Java String and StringBuffer classes, such as the ability to replace all occurrences of a given substring in a target string. It also provides easy-to-use methods to convert between delimited strings, such as CSV strings, and collections and arrays.

自从：

16 April 2001

作者：

Rod Johnson, Juergen Hoeller, Keith Donald, Rob Harrop

另请参见：

org.apache.commons.lang.StringUtils

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构造函数摘要
StringUtils()

 

方法摘要
static java.lang.String[]	addStringToArray(java.lang.String[] array, java.lang.String str)           Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.
static java.lang.String	applyRelativePath(java.lang.String path, java.lang.String relativePath)           Apply the given relative path to the given path, assuming standard Java folder separation (i.e. "/" separators);
static java.lang.String	arrayToCommaDelimitedString(java.lang.Object[] arr)           Convenience method to return a String array as a CSV String.
static java.lang.String	arrayToDelimitedString(java.lang.Object[] arr, java.lang.String delim)           Convenience method to return a String array as a delimited (e.g.
static java.lang.String	capitalize(java.lang.String str)           Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char).
static java.lang.String	cleanPath(java.lang.String path)           Normalize the path by suppressing sequences like "path/.." and inner simple dots.
static java.lang.String	collectionToCommaDelimitedString(java.util.Collection coll)           Convenience method to return a Collection as a CSV String.
static java.lang.String	collectionToDelimitedString(java.util.Collection coll, java.lang.String delim)           Convenience method to return a Collection as a delimited (e.g.
static java.lang.String	collectionToDelimitedString(java.util.Collection coll, java.lang.String delim, java.lang.String prefix, java.lang.String suffix)           Convenience method to return a Collection as a delimited (e.g.
static java.util.Set	commaDelimitedListToSet(java.lang.String str)           Convenience method to convert a CSV string list to a set.
static java.lang.String[]	commaDelimitedListToStringArray(java.lang.String str)           Convert a CSV list into an array of Strings.
static int	countOccurrencesOf(java.lang.String str, java.lang.String sub)           Count the occurrences of the substring in string s.
static java.lang.String	delete(java.lang.String inString, java.lang.String pattern)           Delete all occurrences of the given substring.
static java.lang.String	deleteAny(java.lang.String inString, java.lang.String charsToDelete)           Delete any character in a given string.
static java.lang.String[]	delimitedListToStringArray(java.lang.String str, java.lang.String delimiter)           Take a String which is a delimited list and convert it to a String array.
static boolean	endsWithIgnoreCase(java.lang.String str, java.lang.String suffix)           Test if the given String ends with the specified suffix, ignoring upper/lower case.
static java.lang.String	getFilename(java.lang.String path)           Extract the filename from the given path, e.g.
static java.lang.String	getFilenameExtension(java.lang.String path)           Extract the filename extension from the given path, e.g.
static boolean	hasLength(java.lang.String str)           Check if a String has length.
static boolean	hasText(java.lang.String str)           Check if a String has text.
static java.util.Locale	parseLocaleString(java.lang.String localeString)           Parse the given locale string into a java.util.Locale.
static boolean	pathEquals(java.lang.String path1, java.lang.String path2)           Compare two paths after normalization of them.
static java.lang.String	quote(java.lang.String str)           Quote the given String with single quotes.
static java.lang.Object	quoteIfString(java.lang.Object obj)           Turn the given Object into a String with single quotes if it is a String; keeping the Object as-is else.
static java.lang.String[]	removeDuplicateStrings(java.lang.String[] array)           Remove duplicate Strings from the given array.
static java.lang.String	replace(java.lang.String inString, java.lang.String oldPattern, java.lang.String newPattern)           Replace all occurences of a substring within a string with another string.
static java.lang.String[]	sortStringArray(java.lang.String[] array)           Turn given source String array into sorted array.
static java.lang.String[]	split(java.lang.String toSplit, java.lang.String delimiter)           Split a String at the first occurrence of the delimiter.
static java.util.Properties	splitArrayElementsIntoProperties(java.lang.String[] array, java.lang.String delimiter)           Take an array Strings and split each element based on the given delimiter.
static java.util.Properties	splitArrayElementsIntoProperties(java.lang.String[] array, java.lang.String delimiter, java.lang.String charsToDelete)           Take an array Strings and split each element based on the given delimiter.
static boolean	startsWithIgnoreCase(java.lang.String str, java.lang.String prefix)           Test if the given String starts with the specified prefix, ignoring upper/lower case.
static java.lang.String	stripFilenameExtension(java.lang.String path)           Strip the filename extension from the given path, e.g.
static java.lang.String[]	tokenizeToStringArray(java.lang.String str, java.lang.String delimiters)           Tokenize the given String into a String array via a StringTokenizer.
static java.lang.String[]	tokenizeToStringArray(java.lang.String str, java.lang.String delimiters, boolean trimTokens, boolean ignoreEmptyTokens)           Tokenize the given String into a String array via a StringTokenizer.
static java.lang.String[]	toStringArray(java.util.Collection collection)           Copy the given Collection into a String array.
static java.lang.String	trimLeadingWhitespace(java.lang.String str)           Trim leading whitespace from the given String.
static java.lang.String	trimTrailingWhitespace(java.lang.String str)           Trim trailing whitespace from the given String.
static java.lang.String	trimWhitespace(java.lang.String str)           Trim leading and trailing whitespace from the given String.
static java.lang.String	uncapitalize(java.lang.String str)           Uncapitalize a String, changing the first letter to lower case as per Character.toLowerCase(char).
static java.lang.String	unqualify(java.lang.String qualifiedName)           Unqualify a string qualified by a '.' dot character.
static java.lang.String	unqualify(java.lang.String qualifiedName, char separator)           Unqualify a string qualified by a separator character.

 

从类 java.lang.Object 继承的方法

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

 

构造函数详细信息

StringUtils

public StringUtils()

方法详细信息

hasLength

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

Check if a String has length.

 StringUtils.hasLength(null) = false

 StringUtils.hasLength("") = false

 StringUtils.hasLength(" ") = true

 StringUtils.hasLength("Hello") = true

 

参数：

str - the String to check, may be null

返回：

true if the String is not null and has length

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hasText

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

Check if a String has text. More specifically, returns true if the string not null, it's length is > 0, and it has at least one non-whitespace character.

 StringUtils.hasText(null) = false

 StringUtils.hasText("") = false

 StringUtils.hasText(" ") = false

 StringUtils.hasText("12345") = true

 StringUtils.hasText(" 12345 ") = true

 

参数：

str - the String to check, may be null

返回：

true if the String is not null, length > 0, and not whitespace only

另请参见：

Character.isWhitespace(char)

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trimWhitespace

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

Trim leading and trailing whitespace from the given String.

参数：

str - the String to check

返回：

the trimmed String

另请参见：

Character.isWhitespace(char)

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trimLeadingWhitespace

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

Trim leading whitespace from the given String.

参数：

str - the String to check

返回：

the trimmed String

另请参见：

Character.isWhitespace(char)

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trimTrailingWhitespace

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

Trim trailing whitespace from the given String.

参数：

str - the String to check

返回：

the trimmed String

另请参见：

Character.isWhitespace(char)

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startsWithIgnoreCase

public static boolean startsWithIgnoreCase(java.lang.String str,

                                           java.lang.String prefix)

Test if the given String starts with the specified prefix, ignoring upper/lower case.

参数：

str - the String to check

prefix - the prefix to look for

另请参见：

String.startsWith(java.lang.String, int)

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endsWithIgnoreCase

public static boolean endsWithIgnoreCase(java.lang.String str,

                                         java.lang.String suffix)

Test if the given String ends with the specified suffix, ignoring upper/lower case.

参数：

str - the String to check

suffix - the suffix to look for

另请参见：

String.endsWith(java.lang.String)

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countOccurrencesOf

public static int countOccurrencesOf(java.lang.String str,

                                     java.lang.String sub)

Count the occurrences of the substring in string s.

参数：

str - string to search in. Return 0 if this is null.

sub - string to search for. Return 0 if this is null.

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replace

public static java.lang.String replace(java.lang.String inString,

                                       java.lang.String oldPattern,

                                       java.lang.String newPattern)

Replace all occurences of a substring within a string with another string.

参数：

inString - String to examine

oldPattern - String to replace

newPattern - String to insert

返回：

a String with the replacements

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delete

public static java.lang.String delete(java.lang.String inString,

                                      java.lang.String pattern)

Delete all occurrences of the given substring.

参数：

pattern - the pattern to delete all occurrences of

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deleteAny

public static java.lang.String deleteAny(java.lang.String inString,

                                         java.lang.String charsToDelete)

Delete any character in a given string.

参数：

charsToDelete - a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new lines.

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quote

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

Quote the given String with single quotes.

参数：

str - the input String (e.g. "myString")

返回：

the quoted String (e.g. "'myString'"), or null if the input was null

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quoteIfString

public static java.lang.Object quoteIfString(java.lang.Object obj)

Turn the given Object into a String with single quotes if it is a String; keeping the Object as-is else.

参数：

obj - the input Object (e.g. "myString")

返回：

the quoted String (e.g. "'myString'"), or the input object as-is if not a String

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unqualify

public static java.lang.String unqualify(java.lang.String qualifiedName)

Unqualify a string qualified by a '.' dot character. For example, "this.name.is.qualified", returns "qualified".

参数：

qualifiedName - the qualified name

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unqualify

public static java.lang.String unqualify(java.lang.String qualifiedName,

                                         char separator)

Unqualify a string qualified by a separator character. For example, "this:name:is:qualified" returns "qualified" if using a ':' separator.

参数：

qualifiedName - the qualified name

separator - the separator

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capitalize

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

Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char). No other letters are changed.

参数：

str - the String to capitalize, may be null

返回：

the capitalized String, null if null

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uncapitalize

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

Uncapitalize a String, changing the first letter to lower case as per Character.toLowerCase(char). No other letters are changed.

参数：

str - the String to uncapitalize, may be null

返回：

the uncapitalized String, null if null

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getFilename

public static java.lang.String getFilename(java.lang.String path)

Extract the filename from the given path, e.g. "mypath/myfile.txt" -> "myfile.txt".

参数：

path - the file path (may be null)

返回：

the extracted filename, or null if none

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getFilenameExtension

public static java.lang.String getFilenameExtension(java.lang.String path)

Extract the filename extension from the given path, e.g. "mypath/myfile.txt" -> "txt".

参数：

path - the file path (may be null)

返回：

the extracted filename extension, or null if none

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stripFilenameExtension

public static java.lang.String stripFilenameExtension(java.lang.String path)

Strip the filename extension from the given path, e.g. "mypath/myfile.txt" -> "mypath/myfile".

参数：

path - the file path (may be null)

返回：

the path with stripped filename extension, or null if none

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applyRelativePath

public static java.lang.String applyRelativePath(java.lang.String path,

                                                 java.lang.String relativePath)

Apply the given relative path to the given path, assuming standard Java folder separation (i.e. "/" separators);

参数：

path - the path to start from (usually a full file path)

relativePath - the relative path to apply (relative to the full file path above)

返回：

the full file path that results from applying the relative path

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cleanPath

public static java.lang.String cleanPath(java.lang.String path)

Normalize the path by suppressing sequences like "path/.." and inner simple dots.

The result is convenient for path comparison. For other uses, notice that Windows separators ("\") are replaced by simple slashes.

参数：

path - the original path

返回：

the normalized path

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pathEquals

public static boolean pathEquals(java.lang.String path1,

                                 java.lang.String path2)

Compare two paths after normalization of them.

参数：

path1 - First path for comparizon

path2 - Second path for comparizon

返回：

whether the two paths are equivalent after normalization

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parseLocaleString

public static java.util.Locale parseLocaleString(java.lang.String localeString)

Parse the given locale string into a java.util.Locale. This is the inverse operation of Locale's toString.

参数：

localeString - the locale string, following java.util.Locale's toString format ("en", "en_UK", etc). Also accepts spaces as separators, as alternative to underscores.

返回：

a corresponding Locale instance

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addStringToArray

public static java.lang.String[] addStringToArray(java.lang.String[] array,

                                                  java.lang.String str)

Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.

参数：

array - the array to append to (can be null)

str - the String to append

返回：

the new array (never null)

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sortStringArray

public static java.lang.String[] sortStringArray(java.lang.String[] array)

Turn given source String array into sorted array.

参数：

array - the source array

返回：

the sorted array (never null)

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toStringArray

public static java.lang.String[] toStringArray(java.util.Collection collection)

Copy the given Collection into a String array. The Collection must contain String elements only.

参数：

collection - the Collection to copy

返回：

the String array (null if the Collection was null as well)

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removeDuplicateStrings

public static java.lang.String[] removeDuplicateStrings(java.lang.String[] array)

Remove duplicate Strings from the given array. Also sorts the array, as it uses a TreeSet.

参数：

array - the String array

返回：

an array without duplicates, in natural sort order

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split

public static java.lang.String[] split(java.lang.String toSplit,

                                       java.lang.String delimiter)

Split a String at the first occurrence of the delimiter. Does not include the delimiter in the result.

参数：

toSplit - the string to split

delimiter - to split the string up with

返回：

a two element array with index 0 being before the delimiter, and index 1 being after the delimiter (neither element includes the delimiter); or null if the delimiter wasn't found in the given input String

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splitArrayElementsIntoProperties

public static java.util.Properties splitArrayElementsIntoProperties(java.lang.String[] array,

                                                                    java.lang.String delimiter)

Take an array Strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.

Will trim both the key and value before adding them to the Properties instance.

参数：

array - the array to process

delimiter - to split each element using (typically the equals symbol)

返回：

a Properties instance representing the array contents, or null if the array to process was null or empty

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splitArrayElementsIntoProperties

public static java.util.Properties splitArrayElementsIntoProperties(java.lang.String[] array,

                                                                    java.lang.String delimiter,

                                                                    java.lang.String charsToDelete)

Take an array Strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.

Will trim both the key and value before adding them to the Properties instance.

参数：

array - the array to process

delimiter - to split each element using (typically the equals symbol)

charsToDelete - one or more characters to remove from each element prior to attempting the split operation (typically the quotation mark symbol), or null if no removal should occur

返回：

a Properties instance representing the array contents, or null if the array to process was null or empty

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tokenizeToStringArray

public static java.lang.String[] tokenizeToStringArray(java.lang.String str,

                                                       java.lang.String delimiters)

Tokenize the given String into a String array via a StringTokenizer. Trims tokens and omits empty tokens.

The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray

参数：

str - the String to tokenize

delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter).

返回：

an array of the tokens

另请参见：

StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)

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tokenizeToStringArray

public static java.lang.String[] tokenizeToStringArray(java.lang.String str,

                                                       java.lang.String delimiters,

                                                       boolean trimTokens,

                                                       boolean ignoreEmptyTokens)

Tokenize the given String into a String array via a StringTokenizer.

The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray

参数：

str - the String to tokenize

delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter)

trimTokens - trim the tokens via String's trim

ignoreEmptyTokens - omit empty tokens from the result array (only applies to tokens that are empty after trimming; StringTokenizer will not consider subsequent delimiters as token in the first place).

返回：

an array of the tokens

另请参见：

StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)

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delimitedListToStringArray

public static java.lang.String[] delimitedListToStringArray(java.lang.String str,

                                                            java.lang.String delimiter)

Take a String which is a delimited list and convert it to a String array.

A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters - in contrast to tokenizeToStringArray.

参数：

str - the input String

delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)

返回：

an array of the tokens in the list

另请参见：

tokenizeToStringArray(java.lang.String, java.lang.String)

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commaDelimitedListToStringArray

public static java.lang.String[] commaDelimitedListToStringArray(java.lang.String str)

Convert a CSV list into an array of Strings.

参数：

str - CSV list

返回：

an array of Strings, or the empty array if s is null

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commaDelimitedListToSet

public static java.util.Set commaDelimitedListToSet(java.lang.String str)

Convenience method to convert a CSV string list to a set. Note that this will suppress duplicates.

参数：

str - CSV String

返回：

a Set of String entries in the list

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arrayToDelimitedString

public static java.lang.String arrayToDelimitedString(java.lang.Object[] arr,

                                                      java.lang.String delim)

Convenience method to return a String array as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

参数：

arr - array to display. Elements may be of any type (toString will be called on each element).

delim - delimiter to use (probably a ",")

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collectionToDelimitedString

public static java.lang.String collectionToDelimitedString(java.util.Collection coll,

                                                           java.lang.String delim,

                                                           java.lang.String prefix,

                                                           java.lang.String suffix)

Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

参数：

coll - Collection to display

delim - delimiter to use (probably a ",")

prefix - string to start each element with

suffix - string to end each element with

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collectionToDelimitedString

public static java.lang.String collectionToDelimitedString(java.util.Collection coll,

                                                           java.lang.String delim)

Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.

参数：

coll - Collection to display

delim - delimiter to use (probably a ",")

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arrayToCommaDelimitedString

public static java.lang.String arrayToCommaDelimitedString(java.lang.Object[] arr)

Convenience method to return a String array as a CSV String. E.g. useful for toString() implementations.

参数：

arr - array to display. Elements may be of any type (toString will be called on each element).

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collectionToCommaDelimitedString

public static java.lang.String collectionToCommaDelimitedString(java.util.Collection coll)

Convenience method to return a Collection as a CSV String. E.g. useful for toString() implementations.

参数：

coll - Collection to display

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概述

软件包

类

使用

树

已过时

索引

帮助

 上一个类   下一个类

框架    无框架     <script type="text/javascript"></script>所有类

摘要： 嵌套 | 字段 | 构造函数 | 方法

详细信息： 字段 | 构造函数 | 方法

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