cn.tom.kit

类 StringUtil

java.lang.Object

cn.tom.kit.StringUtil

public class StringUtil
extends Object

字段概要

字段

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

构造器概要

构造器

构造器和说明
StringUtil()

方法概要

方法

限定符和类型	方法和说明
static String	composeMessage(String source, String... replacement)
static boolean	contains(String str, String searchStr)
static int	countOccurrencesOf(String str, String sub) Count the occurrences of the substring in string s.
static String	defaultIfEmpty(String str, String defaultStr)
static boolean	equals(String str1, String str2)
static String	escapeSql(String str)
static boolean	hasLength(CharSequence str) 检查包含空白字符在内的字符系列长度 StringUtils.hasLength(null) = false StringUtils.hasLength("") = false StringUtils.hasLength(" ") = true StringUtils.hasLength("Hello") = true
static boolean	hasText(CharSequence str)
static boolean	hasText(String str) Check whether the given String has actual text.
static boolean	isEmpty(String str)
static String	join(Object[] obj, String split) {null,"",null,2,3} --> 2,3 {"",2,"",2,"",} --> 2,2
static String	substringBefore(String str, String separator)
static String	substringBetween(String str, String tag)
static String	substringBetween(String str, String open, String close)
static String[]	tokenizeToStringArray(String str, String delimiters) Tokenize the given String into a String array via a StringTokenizer.
static String[]	tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) Tokenize the given String into a String array via a StringTokenizer.
static String[]	toStringArray(Collection<String> collection) Copy the given Collection into a String array.

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

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

构造器详细资料

StringUtil

public StringUtil()

方法详细资料

isEmpty

public static boolean isEmpty(String str)

equals

public static boolean equals(String str1,
             String str2)

escapeSql

public static String escapeSql(String str)

substringBefore

public static String substringBefore(String str,
                     String separator)

substringBetween

public static String substringBetween(String str,
                      String tag)

substringBetween

public static String substringBetween(String str,
                      String open,
                      String close)

contains

public static boolean contains(String str,
               String searchStr)

defaultIfEmpty

public static String defaultIfEmpty(String str,
                    String defaultStr)

join

public static String join(Object[] obj,
          String split)

{null,"",null,2,3} --> 2,3 {"",2,"",2,"",} --> 2,2

参数:

obj -

split -

返回:

tokenizeToStringArray

public static String[] tokenizeToStringArray(String str,
                             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

另请参阅:

StringTokenizer, String.trim()

tokenizeToStringArray

public static String[] tokenizeToStringArray(String str,
                             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 (null if the input String was null)

另请参阅:

StringTokenizer, String.trim()

toStringArray

public static String[] toStringArray(Collection<String> 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 passed-in Collection was null)

hasText

public static boolean hasText(String str)

Check whether the given String has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains at least one non-whitespace character.

参数:

str - the String to check (may be null)

返回:

true if the String is not null, its length is greater than 0, and it does not contain whitespace only

另请参阅:

hasText(CharSequence)

hasText

public static boolean hasText(CharSequence str)

hasLength

public static boolean hasLength(CharSequence str)

检查包含空白字符在内的字符系列长度

 StringUtils.hasLength(null) = false
 StringUtils.hasLength("") = false
 StringUtils.hasLength(" ") = true
 StringUtils.hasLength("Hello") = true
 

参数:

str - the CharSequence to check (may be null)

返回:

true if the CharSequence is not null and has length

另请参阅:

hasText(String)

countOccurrencesOf

public static int countOccurrencesOf(String str,
                     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.

composeMessage

public static String composeMessage(String source,
                    String... replacement)