StringUtil (Netty 4.1.109.Final API文档 - 即时通讯网(52im.net))

java.lang.Object
- io.netty.util.internal.StringUtil

public final class StringUtil
extends java.lang.Object

String utility class.

字段概要

字段
限定符和类型	字段和说明
`static char`	`CARRIAGE_RETURN`
`static char`	`COMMA`
`static char`	`DOUBLE_QUOTE`
`static java.lang.String`	`EMPTY_STRING`
`static char`	`LINE_FEED`
`static java.lang.String`	`NEWLINE`
`static char`	`SPACE`
`static char`	`TAB`

方法概要

All Methods Static Methods Concrete Methods
限定符和类型	方法和说明
`static java.lang.String`	`byteToHexString(int value)` Converts the specified byte value into a hexadecimal integer.
`static <T extends java.lang.Appendable> T`	`byteToHexString(T buf, int value)` Converts the specified byte value into a hexadecimal integer and appends it to the specified buffer.
`static java.lang.String`	`byteToHexStringPadded(int value)` Converts the specified byte value into a 2-digit hexadecimal integer.
`static <T extends java.lang.Appendable> T`	`byteToHexStringPadded(T buf, int value)` Converts the specified byte value into a 2-digit hexadecimal integer and appends it to the specified buffer.
`static boolean`	`commonSuffixOfLength(java.lang.String s, java.lang.String p, int len)` Checks if two strings have the same suffix of specified length
`static byte`	`decodeHexByte(java.lang.CharSequence s, int pos)` Decode a 2-digit hex byte from within a string.
`static byte[]`	`decodeHexDump(java.lang.CharSequence hexDump)` Decodes a hex dump
`static byte[]`	`decodeHexDump(java.lang.CharSequence hexDump, int fromIndex, int length)` Decodes part of a string with hex dump
`static int`	`decodeHexNibble(byte b)` Helper to decode half of a hexadecimal number from a string.
`static int`	`decodeHexNibble(char c)` Helper to decode half of a hexadecimal number from a string.
`static boolean`	`endsWith(java.lang.CharSequence s, char c)` Determine if the string `s` ends with the char `c`.
`static java.lang.CharSequence`	`escapeCsv(java.lang.CharSequence value)` Escapes the specified value, if necessary according to RFC-4180.
`static java.lang.CharSequence`	`escapeCsv(java.lang.CharSequence value, boolean trimWhiteSpace)` Escapes the specified value, if necessary according to RFC-4180.
`static int`	`indexOfNonWhiteSpace(java.lang.CharSequence seq, int offset)` Find the index of the first non-white space character in `s` starting at `offset`.
`static int`	`indexOfWhiteSpace(java.lang.CharSequence seq, int offset)` Find the index of the first white space character in `s` starting at `offset`.
`static boolean`	`isNullOrEmpty(java.lang.String s)` Determine if a string is `null` or `String.isEmpty()` returns `true`.
`static boolean`	`isSurrogate(char c)` Determine if `c` lies within the range of values defined for Surrogate Code Point.
`static java.lang.CharSequence`	`join(java.lang.CharSequence separator, java.lang.Iterable<? extends java.lang.CharSequence> elements)` Returns a char sequence that contains all `elements` joined by a given separator.
`static int`	`length(java.lang.String s)` Get the length of a string, `null` input is considered `0` length.
`static java.lang.String`	`simpleClassName(java.lang.Class<?> clazz)` Generates a simplified name from a `Class`.
`static java.lang.String`	`simpleClassName(java.lang.Object o)` The shortcut to `simpleClassName(o.getClass())`.
`static java.lang.String`	`substringAfter(java.lang.String value, char delim)` Get the item after one char delim if the delim is found (else null).
`static java.lang.String`	`substringBefore(java.lang.String value, char delim)` Get the item before one char delim if the delim is found (else null).
`static java.lang.String`	`toHexString(byte[] src)` Converts the specified byte array into a hexadecimal value.
`static java.lang.String`	`toHexString(byte[] src, int offset, int length)` Converts the specified byte array into a hexadecimal value.
`static <T extends java.lang.Appendable> T`	`toHexString(T dst, byte[] src)` Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
`static <T extends java.lang.Appendable> T`	`toHexString(T dst, byte[] src, int offset, int length)` Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
`static java.lang.String`	`toHexStringPadded(byte[] src)` Converts the specified byte array into a hexadecimal value.
`static java.lang.String`	`toHexStringPadded(byte[] src, int offset, int length)` Converts the specified byte array into a hexadecimal value.
`static <T extends java.lang.Appendable> T`	`toHexStringPadded(T dst, byte[] src)` Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
`static <T extends java.lang.Appendable> T`	`toHexStringPadded(T dst, byte[] src, int offset, int length)` Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
`static java.lang.CharSequence`	`trimOws(java.lang.CharSequence value)` Trim optional white-space characters from the specified value, according to RFC-7230.
`static java.lang.CharSequence`	`unescapeCsv(java.lang.CharSequence value)` Unescapes the specified escaped CSV field, if necessary according to RFC-4180.
`static java.util.List<java.lang.CharSequence>`	`unescapeCsvFields(java.lang.CharSequence value)` Unescapes the specified escaped CSV fields according to RFC-4180.

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_STRING
```
public static final java.lang.String EMPTY_STRING
```
    另请参阅:
    
    常量字段值
  - NEWLINE
```
public static final java.lang.String NEWLINE
```
  - DOUBLE_QUOTE
```
public static final char DOUBLE_QUOTE
```
    另请参阅:
    
    常量字段值
  - COMMA
```
public static final char COMMA
```
    另请参阅:
    
    常量字段值
  - LINE_FEED
```
public static final char LINE_FEED
```
    另请参阅:
    
    常量字段值
  - CARRIAGE_RETURN
```
public static final char CARRIAGE_RETURN
```
    另请参阅:
    
    常量字段值
  - TAB
```
public static final char TAB
```
    另请参阅:
    
    常量字段值
  - SPACE
```
public static final char SPACE
```
    另请参阅:
    
    常量字段值
- 方法详细资料
  - substringAfter
```
public static java.lang.String substringAfter(java.lang.String value,
                                              char delim)
```
    Get the item after one char delim if the delim is found (else null). This operation is a simplified and optimized version of String.split(String, int).
  - substringBefore
```
public static java.lang.String substringBefore(java.lang.String value,
                                               char delim)
```
    Get the item before one char delim if the delim is found (else null). This operation is a simplified and optimized version of String.split(String, int).
  - commonSuffixOfLength
```
public static boolean commonSuffixOfLength(java.lang.String s,
                                           java.lang.String p,
                                           int len)
```
    Checks if two strings have the same suffix of specified length
    
    参数:
    
    s - string
    
    p - string
    
    len - length of the common suffix
    
    返回:
    
    true if both s and p are not null and both have the same suffix. Otherwise - false
  - byteToHexStringPadded
```
public static java.lang.String byteToHexStringPadded(int value)
```
    Converts the specified byte value into a 2-digit hexadecimal integer.
  - byteToHexStringPadded
```
public static <T extends java.lang.Appendable> T byteToHexStringPadded(T buf,
                                                                       int value)
```
    Converts the specified byte value into a 2-digit hexadecimal integer and appends it to the specified buffer.
  - toHexStringPadded
```
public static java.lang.String toHexStringPadded(byte[] src)
```
    Converts the specified byte array into a hexadecimal value.
  - toHexStringPadded
```
public static java.lang.String toHexStringPadded(byte[] src,
                                                 int offset,
                                                 int length)
```
    Converts the specified byte array into a hexadecimal value.
  - toHexStringPadded
```
public static <T extends java.lang.Appendable> T toHexStringPadded(T dst,
                                                                   byte[] src)
```
    Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
  - toHexStringPadded
```
public static <T extends java.lang.Appendable> T toHexStringPadded(T dst,
                                                                   byte[] src,
                                                                   int offset,
                                                                   int length)
```
    Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
  - byteToHexString
```
public static java.lang.String byteToHexString(int value)
```
    Converts the specified byte value into a hexadecimal integer.
  - byteToHexString
```
public static <T extends java.lang.Appendable> T byteToHexString(T buf,
                                                                 int value)
```
    Converts the specified byte value into a hexadecimal integer and appends it to the specified buffer.
  - toHexString
```
public static java.lang.String toHexString(byte[] src)
```
    Converts the specified byte array into a hexadecimal value.
  - toHexString
```
public static java.lang.String toHexString(byte[] src,
                                           int offset,
                                           int length)
```
    Converts the specified byte array into a hexadecimal value.
  - toHexString
```
public static <T extends java.lang.Appendable> T toHexString(T dst,
                                                             byte[] src)
```
    Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
  - toHexString
```
public static <T extends java.lang.Appendable> T toHexString(T dst,
                                                             byte[] src,
                                                             int offset,
                                                             int length)
```
    Converts the specified byte array into a hexadecimal value and appends it to the specified buffer.
  - decodeHexNibble
```
public static int decodeHexNibble(char c)
```
    Helper to decode half of a hexadecimal number from a string.
    
    参数:
    
    c - The ASCII character of the hexadecimal number to decode. Must be in the range [0-9a-fA-F].
    
    返回:
    
    The hexadecimal value represented in the ASCII character given, or -1 if the character is invalid.
  - decodeHexNibble
```
public static int decodeHexNibble(byte b)
```
    Helper to decode half of a hexadecimal number from a string.
    
    参数:
    
    b - The ASCII character of the hexadecimal number to decode. Must be in the range [0-9a-fA-F].
    
    返回:
    
    The hexadecimal value represented in the ASCII character given, or -1 if the character is invalid.
  - decodeHexByte
```
public static byte decodeHexByte(java.lang.CharSequence s,
                                 int pos)
```
    Decode a 2-digit hex byte from within a string.
  - decodeHexDump
```
public static byte[] decodeHexDump(java.lang.CharSequence hexDump,
                                   int fromIndex,
                                   int length)
```
    Decodes part of a string with hex dump
    
    参数:
    
    hexDump - a CharSequence which contains the hex dump
    
    fromIndex - start of hex dump in hexDump
    
    length - hex string length
  - decodeHexDump
```
public static byte[] decodeHexDump(java.lang.CharSequence hexDump)
```
    Decodes a hex dump
  - simpleClassName
```
public static java.lang.String simpleClassName(java.lang.Object o)
```
    The shortcut to simpleClassName(o.getClass()).
  - simpleClassName
```
public static java.lang.String simpleClassName(java.lang.Class<?> clazz)
```
    Generates a simplified name from a Class. Similar to Class.getSimpleName(), but it works fine with anonymous classes.
  - escapeCsv
```
public static java.lang.CharSequence escapeCsv(java.lang.CharSequence value)
```
    Escapes the specified value, if necessary according to RFC-4180.
    
    参数:
    
    value - The value which will be escaped according to RFC-4180
    
    返回:
    
    CharSequence the escaped value if necessary, or the value unchanged
  - escapeCsv
```
public static java.lang.CharSequence escapeCsv(java.lang.CharSequence value,
                                               boolean trimWhiteSpace)
```
    Escapes the specified value, if necessary according to RFC-4180.
    
    参数:
    
    value - The value which will be escaped according to RFC-4180
    
    trimWhiteSpace - The value will first be trimmed of its optional white-space characters, according to RFC-7230
    
    返回:
    
    CharSequence the escaped value if necessary, or the value unchanged
  - unescapeCsv
```
public static java.lang.CharSequence unescapeCsv(java.lang.CharSequence value)
```
    Unescapes the specified escaped CSV field, if necessary according to RFC-4180.
    
    参数:
    
    value - The escaped CSV field which will be unescaped according to RFC-4180
    
    返回:
    
    CharSequence the unescaped value if necessary, or the value unchanged
  - unescapeCsvFields
```
public static java.util.List<java.lang.CharSequence> unescapeCsvFields(java.lang.CharSequence value)
```
    Unescapes the specified escaped CSV fields according to RFC-4180.
    
    参数:
    
    value - A string with multiple CSV escaped fields which will be unescaped according to RFC-4180
    
    返回:
    
    List the list of unescaped fields
  - length
```
public static int length(java.lang.String s)
```
    Get the length of a string, null input is considered 0 length.
  - isNullOrEmpty
```
public static boolean isNullOrEmpty(java.lang.String s)
```
    Determine if a string is null or String.isEmpty() returns true.
  - indexOfNonWhiteSpace
```
public static int indexOfNonWhiteSpace(java.lang.CharSequence seq,
                                       int offset)
```
    Find the index of the first non-white space character in s starting at offset.
    
    参数:
    
    seq - The string to search.
    
    offset - The offset to start searching at.
    
    返回:
    
    the index of the first non-white space character or <-1 if none was found.
  - indexOfWhiteSpace
```
public static int indexOfWhiteSpace(java.lang.CharSequence seq,
                                    int offset)
```
    Find the index of the first white space character in s starting at offset.
    
    参数:
    
    seq - The string to search.
    
    offset - The offset to start searching at.
    
    返回:
    
    the index of the first white space character or <-1 if none was found.
  - isSurrogate
```
public static boolean isSurrogate(char c)
```
    Determine if c lies within the range of values defined for Surrogate Code Point.
    
    参数:
    
    c - the character to check.
    
    返回:
    
    true if c lies within the range of values defined for Surrogate Code Point. false otherwise.
  - endsWith
```
public static boolean endsWith(java.lang.CharSequence s,
                               char c)
```
    Determine if the string s ends with the char c.
    
    参数:
    
    s - the string to test
    
    c - the tested char
    
    返回:
    
    true if s ends with the char c
  - trimOws
```
public static java.lang.CharSequence trimOws(java.lang.CharSequence value)
```
    Trim optional white-space characters from the specified value, according to RFC-7230.
    
    参数:
    
    value - the value to trim
    
    返回:
    
    CharSequence the trimmed value if necessary, or the value unchanged
  - join
```
public static java.lang.CharSequence join(java.lang.CharSequence separator,
                                          java.lang.Iterable<? extends java.lang.CharSequence> elements)
```
    Returns a char sequence that contains all elements joined by a given separator.
    
    参数:
    
    separator - for each element
    
    elements - to join together
    
    返回:
    
    a char sequence joined by a given separator.

类 StringUtil

字段概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

EMPTY_STRING

NEWLINE

DOUBLE_QUOTE

COMMA

LINE_FEED

CARRIAGE_RETURN

TAB

SPACE

方法详细资料

substringAfter

substringBefore

commonSuffixOfLength

byteToHexStringPadded

byteToHexStringPadded

toHexStringPadded

toHexStringPadded

toHexStringPadded

toHexStringPadded

byteToHexString

byteToHexString

toHexString

toHexString

toHexString

toHexString

decodeHexNibble

decodeHexNibble

decodeHexByte

decodeHexDump

decodeHexDump

simpleClassName

simpleClassName

escapeCsv

escapeCsv

unescapeCsv

unescapeCsvFields

length

isNullOrEmpty

indexOfNonWhiteSpace

indexOfWhiteSpace

isSurrogate

endsWith

trimOws

join