java io

字节流：

对于 byte[]数组，可以对字节流自由转换

byte buff[] = "test information".getBytes();

ByteArrayInputStream inputStream = new ByteArrayInputStream(buff);

String infos = buff.toString();

byte []pos = new byte[buff.length()];

while(inputStream.read(pos) != -1);  //当执行完read之后，inputstream里面就为空了，getAvailable() ==0

String info = pos.toString();