cn.hutool.core.io

类 BOMInputStream

java.lang.Object

java.io.InputStream

cn.hutool.core.io.BOMInputStream

所有已实现的接口:

java.io.Closeable, java.lang.AutoCloseable

public class BOMInputStream
extends java.io.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
BOM定义：http://www.unicode.org/unicode/faq/utf_bom.html

• 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

参考： http://akini.mbnet.fi/java/unicodereader/UnicodeInputStream.java.txt

构造器概要

构造器

构造器和说明
BOMInputStream(java.io.InputStream in)
BOMInputStream(java.io.InputStream in, java.lang.String defaultCharset)

方法概要

方法

限定符和类型	方法和说明
void	close()
java.lang.String	getCharset()
java.lang.String	getDefaultCharset()
protected void	init() Read-ahead four bytes and check for BOM marks.
int	read()

从类继承的方法 java.io.InputStream

available, mark, markSupported, read, read, reset, skip

从类继承的方法 java.lang.Object

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

构造器详细资料

BOMInputStream

public BOMInputStream(java.io.InputStream in)

BOMInputStream

public BOMInputStream(java.io.InputStream in,
              java.lang.String defaultCharset)

方法详细资料

getDefaultCharset

public java.lang.String getDefaultCharset()

getCharset

public java.lang.String getCharset()

close

public void close()
           throws java.io.IOException

指定者:

close 在接口中 java.io.Closeable

指定者:

close 在接口中 java.lang.AutoCloseable

覆盖:

close 在类中 java.io.InputStream

抛出:

java.io.IOException

read

public int read()
         throws java.io.IOException

指定者:

read 在类中 java.io.InputStream

抛出:

java.io.IOException

init

protected void init()
             throws java.io.IOException

Read-ahead four bytes and check for BOM marks.
Extra bytes are unread back to the stream, only BOM bytes are skipped.

抛出:

java.io.IOException - 读取引起的异常