BufferUtil (hutool 5.8.33 API)

java.lang.Object
- cn.hutool.core.io.BufferUtil

```
public class BufferUtil
extends Object
```
ByteBuffer 工具类
此工具来自于 t-io 项目以及其它项目的相关部分收集
ByteBuffer的相关介绍见：https://www.cnblogs.com/ruber/p/6857159.html

Since:

4.0.0

Author:

tanyaowu, looly

Constructor Summary

Constructors
Constructor and Description

BufferUtil()

Constructors
Constructor and Description
`BufferUtil()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static ByteBuffer`	`copy(ByteBuffer src, ByteBuffer dest)` 拷贝ByteBuffer
`static ByteBuffer`	`copy(ByteBuffer src, ByteBuffer dest, int length)` 拷贝ByteBuffer
`static ByteBuffer`	`copy(ByteBuffer src, int srcStart, ByteBuffer dest, int destStart, int length)` 拷贝ByteBuffer
`static ByteBuffer`	`copy(ByteBuffer src, int start, int end)` 拷贝到一个新的ByteBuffer
`static ByteBuffer`	`create(byte[] data)` 创建新Buffer
`static ByteBuffer`	`create(CharSequence data, Charset charset)` 从字符串创建新Buffer
`static CharBuffer`	`createCharBuffer(int capacity)` 创建`CharBuffer`
`static ByteBuffer`	`createUtf8(CharSequence data)` 从字符串创建新Buffer，使用UTF-8编码
`static int`	`lineEnd(ByteBuffer buffer)` 一行的末尾位置，查找位置时位移ByteBuffer到结束位置
`static int`	`lineEnd(ByteBuffer buffer, int maxLength)` 一行的末尾位置，查找位置时位移ByteBuffer到结束位置支持的换行符如下： 1.
`static byte[]`	`readBytes(ByteBuffer buffer)` 读取剩余部分bytes
`static byte[]`	`readBytes(ByteBuffer buffer, int maxLength)` 读取指定长度的bytes 如果长度不足，则读取剩余部分，此时buffer必须为读模式
`static byte[]`	`readBytes(ByteBuffer buffer, int start, int end)` 读取指定区间的数据
`static String`	`readLine(ByteBuffer buffer, Charset charset)` 读取一行，如果buffer中最后一部分并非完整一行，则返回null 支持的换行符如下： 1.
`static String`	`readStr(ByteBuffer buffer, Charset charset)` 读取剩余部分并转为字符串
`static String`	`readUtf8Str(ByteBuffer buffer)` 读取剩余部分并转为UTF-8编码字符串

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BufferUtil
```
public BufferUtil()
```
- Method Detail
  - copy
```
public static ByteBuffer copy(ByteBuffer src,
                              int start,
                              int end)
```
    拷贝到一个新的ByteBuffer
    
    Parameters:
    
    src - 源ByteBuffer
    
    start - 起始位置（包括）
    
    end - 结束位置（不包括）
    
    Returns:
    
    新的ByteBuffer
  - copy
```
public static ByteBuffer copy(ByteBuffer src,
                              ByteBuffer dest)
```
    拷贝ByteBuffer
    
    Parameters:
    
    src - 源ByteBuffer
    
    dest - 目标ByteBuffer
    
    Returns:
    
    目标ByteBuffer
  - copy
```
public static ByteBuffer copy(ByteBuffer src,
                              ByteBuffer dest,
                              int length)
```
    拷贝ByteBuffer
    
    Parameters:
    
    src - 源ByteBuffer
    
    dest - 目标ByteBuffer
    
    length - 长度
    
    Returns:
    
    目标ByteBuffer
  - copy
```
public static ByteBuffer copy(ByteBuffer src,
                              int srcStart,
                              ByteBuffer dest,
                              int destStart,
                              int length)
```
    拷贝ByteBuffer
    
    Parameters:
    
    src - 源ByteBuffer
    
    srcStart - 源开始的位置
    
    dest - 目标ByteBuffer
    
    destStart - 目标开始的位置
    
    length - 长度
    
    Returns:
    
    目标ByteBuffer
  - readUtf8Str
```
public static String readUtf8Str(ByteBuffer buffer)
```
    读取剩余部分并转为UTF-8编码字符串
    
    Parameters:
    
    buffer - ByteBuffer
    
    Returns:
    
    字符串
    
    Since:
    
    4.5.0
  - readStr
```
public static String readStr(ByteBuffer buffer,
                             Charset charset)
```
    读取剩余部分并转为字符串
    
    Parameters:
    
    buffer - ByteBuffer
    
    charset - 编码
    
    Returns:
    
    字符串
    
    Since:
    
    4.5.0
  - readBytes
```
public static byte[] readBytes(ByteBuffer buffer)
```
    读取剩余部分bytes
    
    Parameters:
    
    buffer - ByteBuffer
    
    Returns:
    
    bytes
  - readBytes
```
public static byte[] readBytes(ByteBuffer buffer,
                               int maxLength)
```
    读取指定长度的bytes
    如果长度不足，则读取剩余部分，此时buffer必须为读模式
    
    Parameters:
    
    buffer - ByteBuffer
    
    maxLength - 最大长度
    
    Returns:
    
    bytes
  - readBytes
```
public static byte[] readBytes(ByteBuffer buffer,
                               int start,
                               int end)
```
    读取指定区间的数据
    
    Parameters:
    
    buffer - ByteBuffer
    
    start - 开始位置
    
    end - 结束位置
    
    Returns:
    
    bytes
  - lineEnd
```
public static int lineEnd(ByteBuffer buffer)
```
    一行的末尾位置，查找位置时位移ByteBuffer到结束位置
    
    Parameters:
    
    buffer - ByteBuffer
    
    Returns:
    
    末尾位置，未找到或达到最大长度返回-1
  - lineEnd
```
public static int lineEnd(ByteBuffer buffer,
                          int maxLength)
```
    一行的末尾位置，查找位置时位移ByteBuffer到结束位置
    支持的换行符如下：
```
 1. \r\n
 2. \n
 
```
    Parameters:
    
    buffer - ByteBuffer
    
    maxLength - 读取最大长度
    
    Returns:
    
    末尾位置，未找到或达到最大长度返回-1
  - readLine
```
public static String readLine(ByteBuffer buffer,
                              Charset charset)
```
    读取一行，如果buffer中最后一部分并非完整一行，则返回null
    支持的换行符如下：
```
 1. \r\n
 2. \n
 
```
    Parameters:
    
    buffer - ByteBuffer
    
    charset - 编码
    
    Returns:
    
    一行
  - create
```
public static ByteBuffer create(byte[] data)
```
    创建新Buffer
    
    Parameters:
    
    data - 数据
    
    Returns:
    
    ByteBuffer
    
    Since:
    
    4.5.0
  - create
```
public static ByteBuffer create(CharSequence data,
                                Charset charset)
```
    从字符串创建新Buffer
    
    Parameters:
    
    data - 数据
    
    charset - 编码
    
    Returns:
    
    ByteBuffer
    
    Since:
    
    4.5.0
  - createUtf8
```
public static ByteBuffer createUtf8(CharSequence data)
```
    从字符串创建新Buffer，使用UTF-8编码
    
    Parameters:
    
    data - 数据
    
    Returns:
    
    ByteBuffer
    
    Since:
    
    4.5.0
  - createCharBuffer
```
public static CharBuffer createCharBuffer(int capacity)
```
    创建CharBuffer
    
    Parameters:
    
    capacity - 容量
    
    Returns:
    
    CharBuffer
    
    Since:
    
    5.5.7

Class BufferUtil

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

BufferUtil

Method Detail

copy

copy

copy

copy

readUtf8Str

readStr

readBytes

readBytes

readBytes

lineEnd

lineEnd

readLine

create

create

createUtf8

createCharBuffer