数据流与byte[]的转换

[quote]byte[]转换为数据流[/quote]

public static InputStream byteToStream(byte[] b){

		try {
			ByteArrayInputStream input = new ByteArrayInputStream(b);
			return input;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

[quote]数据流转换为byte[][/quote]

public static byte[] streamToByte(InputStream in){
		ByteArrayOutputStream str=new ByteArrayOutputStream();
		int k;
		byte[] b=null;
		try {
			while((k=in.read())!=-1){
				str.write(k);
			}
			b=str.toByteArray();
			str.close();
			return b;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}