Package org.aoju.bus.core.io.stream

Class BOMInputStream

java.lang.Object

java.io.InputStream

org.aoju.bus.core.io.stream.BOMInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class BOMInputStream
extends InputStream

读取带BOM头的流内容,getCharset()方法调用后会得到BOM头的编码,且会去除BOM头

• 00 00 FE FF = UTF-32, big-endian
• FF FE 00 00 = UTF-32, little-endian
• EF BB BF = UTF-8
• FE FF = UTF-16, big-endian
• FF FE = UTF-16, little-endian

使用： String enc = "UTF-8"; // or NULL to use systemdefault FileInputStream fis = new FileInputStream(file); BOMInputStream uin = new BOMInputStream(fis, enc); enc = uin.getCharset(); // check and skip possible BOM bytes

Since:

Java 17+

Author:

Kimi Liu

Constructor Summary

Constructors

Constructor	Description
BOMInputStream(InputStream in)	构造
BOMInputStream(InputStream in, String defaultCharset)	构造

Method Summary

Modifier and Type	Method	Description
void	close()
String	getCharset()	获取BOM头中的编码
String	getDefaultCharset()	获取默认编码
protected void	init()	预读四个字节并检查BOM标记 额外的字节未读回流，只有BOM字节被跳过
int	read()

Methods inherited from class java.io.InputStream

available, mark, markSupported, nullInputStream, read, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Constructor Details

BOMInputStream

public BOMInputStream(InputStream in)

构造

Parameters:

in - 流

BOMInputStream

public BOMInputStream(InputStream in,
 String defaultCharset)

构造

Parameters:

in - 流

defaultCharset - 默认编码

Method Details

getDefaultCharset

public String getDefaultCharset()

获取默认编码

Returns:

默认编码

getCharset

public String getCharset()

获取BOM头中的编码

Returns:

编码

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

init

protected void init()
             throws IOException

预读四个字节并检查BOM标记 额外的字节未读回流，只有BOM字节被跳过

Throws:

IOException - 读取引起的异常