StringUtil (Netty 4.0.56.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`

方法概要

方法
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(char c)` Helper to decode half of a hexadecimal number from a string.
`static java.lang.CharSequence`	`escapeCsv(java.lang.CharSequence value)` Escapes the specified value, if necessary according to RFC-4180.
`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 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`	`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`	`unescapeCsv(java.lang.CharSequence value)` Unescapes the specified escaped CSV field, if necessary 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
  - 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
  - EMPTY_STRING
```
public static final java.lang.String EMPTY_STRING
```
    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).
  - 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.
  - 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
  - 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
  - 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.
  - 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.

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

NEWLINE

DOUBLE_QUOTE

COMMA

LINE_FEED

CARRIAGE_RETURN

EMPTY_STRING

方法详细资料

substringAfter

commonSuffixOfLength

byteToHexStringPadded

byteToHexStringPadded

toHexStringPadded

toHexStringPadded

toHexStringPadded

toHexStringPadded

byteToHexString

byteToHexString

toHexString

toHexString

toHexString

toHexString

decodeHexNibble

decodeHexByte

decodeHexDump

decodeHexDump

simpleClassName

simpleClassName

escapeCsv

unescapeCsv

length

isNullOrEmpty

isSurrogate