public static String read(InputStream in, String charsetName) throws IORuntimeException {
		FastByteArrayOutputStream out = read(in);
		return StrUtil.isBlank(charsetName) ? out.toString() : out.toString(charsetName);
	}
public static String read ( InputStream in , String charsetName ) throws IORuntimeException { FastByteArrayOutputStream out = read ( in ) ; return StrUtil . isBlank ( charsetName ) ? out . toString ( ) : out . toString ( charsetName ) ; }
从流中读取内容

@param in 输入流
@param charsetName 字符集
@return 内容
@throws IORuntimeException IO异常