cn.hutool.core.io.BomReader Maven / Gradle / Ivy
package cn.hutool.core.io;
import cn.hutool.core.lang.Assert;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
/**
* 读取带BOM头的流内容的Reader，如果非bom的流或无法识别的编码，则默认UTF-8
* 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：
*
* FileInputStream fis = new FileInputStream(file);
* BomReader uin = new BomReader(fis);
*
*
* @author looly
* @since 5.7.14
*/
public class BomReader extends Reader {
private InputStreamReader reader;
/**
* 构造
*
* @param in 流
*/
public BomReader(InputStream in) {
Assert.notNull(in, "InputStream must be not null!");
final BOMInputStream bin = (in instanceof BOMInputStream) ? (BOMInputStream) in : new BOMInputStream(in);
try {
this.reader = new InputStreamReader(bin, bin.getCharset());
} catch (UnsupportedEncodingException ignore) {
}
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
return reader.read(cbuf, off, len);
}
@Override
public void close() throws IOException {
reader.close();
}
}