数据流与byte[]的转换
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 blocke.printStackTrace();}return null;}